Texas Instruments | TPS92610-Q1 Automotive Single-Channel Linear LED Driver (Rev. A) | Datasheet | Texas Instruments TPS92610-Q1 Automotive Single-Channel Linear LED Driver (Rev. A) Datasheet

Texas Instruments TPS92610-Q1 Automotive Single-Channel Linear LED Driver (Rev. A) Datasheet
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TPS92610-Q1
SLDS233A – OCTOBER 2017 – REVISED DECEMBER 2017
TPS92610-Q1 Automotive Single-Channel Linear LED Driver
1 Features
3 Description
•
•
With LEDs being widely used in automotive
applications, simple LED drivers are more and more
popular. Compared to discrete solutions, a low-cost
monolithic solution lowers system level component
counts and significantly improves current accuracy
and reliability.
1
•
•
•
•
•
•
•
•
•
Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
– Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
Single-Channel Constant-Current LED Driver With
PWM Dimming
Wide Input-Voltage Range: 4.5 V–40 V
Constant Output Current, Adjustable by Sense
Resistor
Precision Current Regulation, Tolerance ±4.6%
Across Junction Temperature –40°C to 150°C
Maximum Current: 450 mA
Heat Sharing With External Resistor
Low Dropout Voltage (Sense–Resistor Voltage
Drop Included)
– Maximum Dropout: 150 mV at 10 mA
– Maximum Dropout: 400 mV at 70 mA
– Maximum Dropout: 700 mV at 150 mA
– Maximum Dropout: 1.3 V at 300 mA
Diagnostics and Protection
– Single-LED Short-Circuit Detection With AutoRecovery
– LED Open-Circuit and Short-Circuit Detection
With Auto-Recovery
– Diagnostic-Enable With Adjustable Threshold
for Low-Dropout Operation
– Fault Bus up to 15 Devices, Configurable As
Either One-Fails–All-Fail or Only-FailedChannel-Off
– Low Quiescent Current and Fault-Mode
Current (<250 µA per Device)
Operating Junction Temperature Range: –40°C to
150°C
The TPS92610-Q1 device is a simple single-channel
high-side LED driver operating from an automotive
car battery. It is a simple and elegant solution to
deliver constant current for a single LED string with
full LED diagnostics. Its one-fails–all-fail feature is
able to work together with other LED drivers, such as
the TPS9261x-Q1, TPS9263x-Q1, and TPS9283x-Q1
devices, to address different requirements.
Device Information(1)
PART NUMBER
TPS92610-Q1
PACKAGE
BODY SIZE (NOM)
HTSSOP (14)
5 mm × 4.4 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Diagram
4.5 ± 40V
TPS92610 ± Q1
EN
EN
SUPPLY
R(SNS)
DIAGEN
PWM
DIAGEN
IN
PWM
OUT
FAULT
SSH
GND
SSL
R2
FAULT
R1
GND
Copyright © 2017, Texas Instruments Incorporated
2 Applications
•
•
•
Automotive Convenience Lighting: Dome Light,
Door Handles, Reading Lamp, and Miscellaneous
Lamps
Automotive Rear Lamp, Center High-Mounted
Stop Lamp, Side Markers, Blind-Spot Detection
Indicator, Charging Inlet Indicator
General-Purpose LED Driver Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS92610-Q1
SLDS233A – OCTOBER 2017 – REVISED DECEMBER 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
3
6.1
6.2
6.3
6.4
6.5
6.6
6.7
3
4
4
4
4
6
7
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Timing Requirements ................................................
Typical Characteristics ..............................................
Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 14
8
Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application .................................................. 16
9
Layout ................................................................... 20
9.1 Layout Guidelines ................................................... 20
9.2 Layout Example ...................................................... 20
10 Device and Documentation Support ................. 21
10.1
10.2
10.3
10.4
10.5
10.6
Documentation Support .......................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
21
21
21
11 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Original (November 2017) to Revision A
•
2
Page
Changed data sheet from ADVANCE INFORMATION to PRODUCTION DATA .................................................................. 1
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SLDS233A – OCTOBER 2017 – REVISED DECEMBER 2017
5 Pin Configuration and Functions
PWP PowerPAD™ Package
14-Pin HTSSOP With Exposed Termal Pad
Top View
EN
1
14
SUPPLY
DIAGEN
2
13
IN
NC
3
12
NC
PWM
4
11
OUT
NC
Thermal
Pad
NC
5
10
FAULT
6
9
SSH
GND
7
8
SSL
Not to scale
NC – No internal connection
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
DIAGEN
2
I
Diagnostics enable, to avoid false open-circuit diagnostics during low-voltage operation
EN
1
I
Device enable
FAULT
6
I/O
One-fails–all-fail fault bus
GND
7
—
Ground
IN
13
I
NC
Current input
3, 5, 10, 12
—
Not connected
OUT
11
O
Constant-current output
PWM
4
I
PWM input
SSH
9
I
Single-LED short high-side reference
SSL
8
I
Single-LED short low-side reference
SUPPLY
14
I
Device supply voltage
6 Specifications
6.1 Absolute Maximum Ratings
over operating ambient temperature range (unless otherwise noted) (1)
MIN
MAX
High-voltage input
DIAGEN, EN ,IN, PWM, SSH, SSL, SUPPLY
–0.3
45
V
High-voltage output
OUT
–0.3
45
V
Fault bus
FAULT
–0.3
22
V
IN to OUT
V(IN) – V(OUT)
–0.3
45
V
SUPPLY to IN
V(SUPPLY) – V(IN)
–0.3
1
V
Operating junction temperature, TJ
–40
150
°C
Storage temperature, Tstg
–40
150
°C
(1)
UNIT
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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TPS92610-Q1
SLDS233A – OCTOBER 2017 – REVISED DECEMBER 2017
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6.2 ESD Ratings
TPS92610-Q1
VALUE
Human-body model (HBM), per AEC
Q100-002 (1)
V(ESD)
(1)
Electrostatic discharge
Charged-device model (CDM), per AEC
Q100-011
All pins
±2000
All pins
±500
Corner pins (1, 7, 8, and
14)
±750
UNIT
V
AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating ambient temperature range (unless otherwise noted)
MIN
NOM
MAX
UNIT
SUPPLY
Device supply voltage
4.5
40
V
IN
Sense voltage
4.4
40
V
PWM
PWM input
0
40
V
DIAGEN
Diagnostics enable pin
0
40
V
OUT
Driver output
0
40
V
SSH
Single LED short high-side reference
0
5
V
SSL
Single LED short low-side reference
0
5
V
EN
Device enable
0
40
V
FAULT
Fault bus
0
7
V
TA
Operating ambient temperature
–40
125
°C
6.4 Thermal Information
TPS92610-Q1
THERMAL METRIC (1)
PWP (HTSSOP)
UNIT
14 PINS
RθJA
Junction-to-ambient thermal resistance
52.4
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
43.5
°C/W
RθJB
Junction-to-board thermal resistance
22
°C/W
ψJT
Junction-to-top characterization parameter
1.6
°C/W
ψJB
Junction-to-board characterization parameter
22.3
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
6.5
°C/W
(1)
For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics.
6.5 Electrical Characteristics
V(SUPPLY) = 5 V – 40 V, TJ = –40°C–150°C unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
3.2
4
UNIT
BIAS
V(POR_rising)
Supply voltage POR rising
threshold
V(POR_falling)
Supply voltage POR falling
threshold
I(Shutdown)
Device shutdown current
EN = LOW
I(Quiescent)
Device quiescent current
I(FAULT)
Device current in fault mode
4
V
2.2
3
5
10
µA
PWM = HIGH, EN = HIGH
0.1
0.2
0.25
mA
EN = HIGH, PWM = HIGH, FAULT
externally pulled LOW
0.1
0.2
0.25
mA
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Electrical Characteristics (continued)
V(SUPPLY) = 5 V – 40 V, TJ = –40°C–150°C unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LOGIC INPUTS (DIAGEN, PWM, EN)
VIL(DIAGEN)
Input logic-low voltage, DIAGEN
1.045
1.1
1.155
V
VIH(DIAGEN)
Input logic-high voltage, DIAGEN
1.14
1.2
1.26
V
VIL(PWM)
Input logic-low voltage, PWM
1.045
1.1
1.155
V
VIH(PWM)
Input logic-high voltage, PWM
1.14
1.2
1.26
V
VIL(EN)
Input logic-low voltage, EN
0.7
V
VIH(EN)
Input logic-high voltage, EN
IPD(EN)
EN pin pulldown current
2
V(EN) = 12 V
1.5
V
3.3
4.5
µA
450
mA
CONSTANT-CURRENT DRIVER
I(OUT)
Device output-current range
V(CS_REG)
Sense-resistor regulation voltage
R(SNS)
Sense-resistor range
100% duty-cycle
TA = 25°C, V(SUPPLY) = 4.5 V to 18 V
V(DROPOUT)
TA = –40°C to 125°C, V(SUPPLY) = 4.5 V to
18 V
4
94
98
102
93.5
98
102.5
24.5
Voltage dropout from SUPPLY to
OUT
V(CS_REG) voltage included, current setting
= 10 mA
120
150
V(CS_REG) voltage included, current setting
= 70 mA
250
400
V(CS_REG) voltage included, current setting
= 150 mA
430
700
V(CS_REG) voltage included, current setting
= 300 mA
800
1300
mV
Ω
mV
DIAGNOSTICS
V(OPEN_th_rising)
LED open rising threshold, V(IN) –
V(OUT)
70
100
135
mV
V(OPEN_th_falling)
LED open falling threshold, V(IN) –
V(OUT)
235
290
335
mV
V(SG_th_falling)
Channel output V(OUT) short-toground falling threshold
1.14
1.2
1.26
V
V(SG_th_rising)
Channel output V(OUT) short-toground rising threshold
0.82
0.865
0.91
V
I(Retry)
Channel output retry current
V(OUT) = 0 V
0.64
1.08
1.528
mA
V(SSH_th)
Single-LED short-detection highside threshold
V(SSL) – V(SSH)
140
190
235
mV
V(SSL_th)
Single-LED short-detection lowside threshold
0.8
0.86
0.91
V
0.7
V
FAULT
VIL(FAULT)
Logic-input low threshold
VIH(FAULT)
Logic-input high threshold
VOL(FAULT)
Logic-output low voltage
With 500-µA external pullup
VOH(FAULT)
Logic-output high voltage
With 1-µA external pulldown, V(SUPPLY) =
12 V
I(FAULT_pulldown)
FAULT internal pulldown current
I(FAULT_pullup)
FAULT internal pullup current
2
V
5
0.4
V
7
V
500
750
1000
µA
5
8
12
µA
167
172
178
°C
THERMAL PROTECTION
T(TSD)
Thermal shutdown junction
temperature threshold
T(TSD_HYS)
Thermal shutdown junction
temperature hysteresis
15
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5
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6.6 Timing Requirements
MIN
NOM
MAX
t(PWM_delay_rising)
PWM rising edge delay, 50% PWM voltage to 10% of output current, t2 – t1
as shown in Figure 1
10
17
25
µs
t(PWM_delay_falling)
PWM falling edge delay, 50% PWM voltage to 90% of output current, t5 – t4
as shown in Figure 1
15
21
30
µs
t(TSD_deg)
Thermal overtemperature deglitch time
t(DEVICE_STARTUP)
EN rising edge to 10% output current at 150-mA set current and 12-V supply
voltage
t(OPEN_deg)
LED open-circuit fault-deglitch time
t(SG_deg)
Channel-output short-to-ground detection deglitch time
t(SS_deg)
Single-LED short-detection deglitch time
t(Recover_deg)
Recovery deglitch time
60
µs
100
150
µs
80
125
175
µs
80
125
175
µs
80
125
175
µs
16
µs
Input duty-cycle
PWM
90%
90%
Channel
Current
IOUT
UNIT
Output duty-cycle
10%
t1
10%
t2
t3
t4
t5
t6
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Figure 1. Output Timing Diagram
6
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6.7 Typical Characteristics
250
500
I(SET)= 10 mA
I(SET) = 70 mA
I(SET) = 150 mA
I(SET) (mA)
Output Current (mA)
200
300
200
150
100
100
70
50
30
20
10
7
5
50
3
2
0.2 0.3
0
4
10
16
22
28
Supply Voltage (V)
34
40
Figure 2. Output Current vs Supply Voltage
2 3 4 5 6 7 8 10
R(SNS) (:)
20 30
50
D001
Figure 3. Output Current vs Current-Sense Resistor
240
180
I(SET) = 10 mA
I(SET) = 70 mA
I(SET) = 150 mA
150
Ouptout Current (mA)
200
Ouptout Current (mA)
0.5 0.7 1
D001
160
120
80
40
120
90
60
40qC
25qC
125qC
30
0
0
0
0.5
1
Dropout Voltage (V)
1.5
2
0
0.5
D002
Figure 4. Output Current vs Dropout Voltage
1
Dropout Voltage (V)
1.5
2
D003
Figure 5. Output Current vs Temperature
250
100%
Current (PA)
10
Output Current Duty Cycle
40qC, I(Shutdown)
25qC, I(Shutdown)
125qC, I(Shutdown)
40qC, I(FAULT)
25qC, I(FAULT)
125qC, I(FAULT)
40qC, I(Quiescent)
25qC, I(Quiescent)
125qC, I(Quiescent)
100
10%
1%
2
4
10
16
22
28
Supply Voltage (V)
34
40
0.5%
1%
D004
Figure 6. Shutdown, Quiescent, and Fault Current vs Supply
Voltage
10%
PWM Duty Cycle
100%
D005
Figure 7. PWM Output Duty Cycle vs Input Duty Cycle
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Typical Characteristics (continued)
Ch. 1 = V(OUT)
ƒ(PWM) = 200 Hz
Ch. 2 = V(PWM)
Duty cycle = 50%
Ch. 4 = I(OUT)
Figure 8. PWM Dimming via External Input
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Ch. 1 = V(SUPPLY)
Ch. 2 = V(OUT)
Ch. 4 = I(OUT)
f(PWM) = 1000 Hz
SUPPLY dimming between 2.5 V and 12 V
Figure 9. PWM Dimming via Power Supply
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Figure 12. Jump Start
8
Ch. 3 = FAULT
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Figure 11. Transient Overvoltage
Figure 10. Transient Undervoltage
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 3 = FAULT
Duty cycle = 30%
FAULT floating
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Figure 13. Superimposed Alternating Voltage, 15 Hz
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Typical Characteristics (continued)
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Figure 14. Superimposed Alternating Voltage, 1 kHz
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Figure 16. Slow Decrease and Slow Increase of Supply
Voltage
Ch. 1 = V(OUT)
Ch. 2 = FAULT
Ch. 4 = I(OUT)
Figure 18. LED Short-Circuit Protection and Recovery
Ch. 1 = SUPPLY
Ch. 4 = I(OUT)
Ch. 2 = V(OUT)
Ch. 3 = FAULT
Figure 15. Slow Decrease, Quick Increase of Supply Voltage
Ch. 1 = V(OUT)
Ch. 2 = FAULT
Ch. 4 = I(OUT)
Figure 17. LED Open-Circuit Protection and Recovery
Ch. 1 = V(SSH)
Ch. 4 = I(OUT)
Ch. 2 = FAULT
Ch. 3 = V(SSL)
Figure 19. Single-LED-Short Protection and Recovery
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7 Detailed Description
7.1 Overview
The TPS92610-Q1 device is one of a family of single-channel linear LED drivers. The family provides a simple
solution for automotive LED applications. Different package options in the family provide a variety of current
ranges and diagnostic options. The TPS92610-Q1 device in an HTSSOP-14 package supports LED open-circuit
detection and short-to-ground detection. Unique single-LED-short detection in the TPS92610-Q1 device can help
diagnose if one LED within a string is shorted. A one-fails–all-fail fault bus allows the TPS92610-Q1 device to be
used together with the TPS9261x-Q1, TPS9263x-Q1, and TPS9283x-Q1 families.
The output current can be set by an external R(SNS) resistor. Current flows from the supply through the R(SNS)
resistor into the internal current source and to the LEDs.
7.2 Functional Block Diagram
TPS92610-Q1
R(SNS)
SUPPLY
±
+
IN
EN
DIAGEN
OUT
Output Driver
Supply &
Control
PWM
SSH
LED Diagnostics
FAULT
SSL
GND
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7.3 Feature Description
7.3.1 Device Bias
7.3.1.1 Power-On Reset (POR)
The TPS92610-Q1 device has an internal power-on-reset (POR) function. When power is applied to SUPPLY,
the internal POR holds the device in the reset state until V(SUPPLY) is above V(POR_rising).
7.3.1.2 Low-Quiescent-Current Fault Mode
The TPS92610-Q1 device consumes minimal quiescent current when its FAULT pin is externally pulled LOW. At
the same time, the device shuts down the output driver.
10
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Feature Description (continued)
If device detects an internal fault, it pulls the FAULT output LOW with constant current to signal a fault alarm on
the one-fails–all-fail fault bus.
7.3.2 Constant-Current Driver
The TPS92610-Q1 device has a high-side constant-current integrated driver. The device senses channel current
with an external high-side current-sense resistor, R(SNS). A current regulation loop drives an internal transistor
and regulates the current-sense voltage at the current-sense resistor to V(CS_REG). When the output driver is in
regulation, the output current can be set using the following equation.
V(CS _ REG)
I(OUT)
R(SNS)
(1)
7.3.3 Device Enable
The TPS92610-Q1 device has an enable input, EN. When EN is low, the device is in sleep mode with ultralow
quiescent current I(Shutdown). This low current helps to save system-level current consumption in applications
where battery voltage directly connects to the device without high-side switches.
7.3.4 PWM Dimming
The TPS92610-Q1 device supports PWM output dimming via PWM input dimming and supply dimming.
The PWM input functions as an enable for the output current. When the PWM input is low, the device also
disables the diagnostic features.
Supply dimming applies PWM dimming on the power input. For an accurate PWM threshold, TI recommends
using a resistor divider on the PWM input to set the PWM threshold higher than V(POR_rising).
7.3.5 Diagnostics
The TPS92610-Q1 device provides advanced diagnostics and fault protection features for automotive exterior
lighting systems. The device is able to detect and protect from LED string short-to-GND, LED string open-circuit,
and single-LED-short scenarios. It also supports a one-fails–all-fail fault bus that could flexibly fit different
legislative requirements.
7.3.5.1 DIAGEN
The TPS92610-Q1 device supports the DIAGEN pin with an accurate threshold to disable the open-circuit and
single-LED-short diagnostic functions. With a resistor divider, the DIAGEN pin can be used to sense SUPPLY
voltage with a resistor-programmable threshold. With the DIAGEN feature, the device is able to avoid false error
reports due to low-dropout voltage and to drive maximum current in low-dropout mode when the input voltage is
not high enough for current regulation.
When V(DIAGEN) is higher than the threshold VIH(DIAGEN), the device enables LED open-circuit and single-LED-short
diagnostics. When V(DIAGEN) is lower than the threshold VIL(DIAGEN), the device disables LED-open-circuit and
single-LED-short diagnostics.
7.3.5.2 Low-Dropout Mode
When the supply voltage drops, the TPS92610-Q1 device tries to regulate current by driving internal transistors
in the linear region, also known as low-dropout mode, because the voltage across the sense resistor fails to
reach the regulation target.
In low-dropout mode, the open-circuit diagnostic must be disabled. Otherwise, the device treats the low-dropout
mode as an open-circuit fault. The DIAGEN pin is used to avoid false diagnostics on the output channel due to
low supply voltage.
When the DIAGEN voltage is low, single-LED short- and open-circuit detection is ignored. When the DIAGEN
voltage is high, single-LED short- and open-circuit detection return to normal operation.
In dropout mode, a diode in parallel with the sense resistor is recommended to clamp the voltage between
SUPPLY and IN (across the sense resistor) in case of a large current pulse during recovery.
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Feature Description (continued)
7.3.5.3 Open-Circuit Detection
The TPS92610-Q1 device has LED open-circuit detection. Open-circuit detection monitors the output voltage
when the channel is in the ON state. Open-circuit detection is only enabled when DIAGEN is HIGH. A short-tobattery fault is also detected as an LED open-circuit fault.
The device monitors dropout-voltage differences between the IN and OUT pins when PWM is HIGH. The voltage
difference V(IN) – V(OUT) is compared with the internal reference voltage V(OPEN_th_rising) to detect an LED opencircuit failure. If V(IN) – V(OUT) falls below the V(OPEN_th_rising) voltage longer than the deglitch time of t(OPEN_deg), the
device asserts an open-circuit fault. Once an LED open-circuit failure is detected, the constant-current source
pulls the fault bus down. During the deglitch time period, if V(IN) – V(OUT) rises above V(OPEN_th_falling), the deglitch
timer is reset.
When the device is in auto-retry, the device keeps the output ON to retry if the PWM input is HIGH; the device
sources a small current I(retry) from IN to OUT when PWM input is LOW. In either scenario, once a faulty channel
recovers, the device resumes normal operation and releases the FAULT pulldown.
7.3.5.4 Short-to-GND Detection
The TPS92610-Q1 device has LED short-to-GND detection. Short-to-GND detection monitors the output voltage
when the channel is in the ON state. Once a short-to-GND LED failure is detected, the device turns off the output
channel and retries automatically, ignoring the PWM input. If the retry mechanism detects removal of the LED
short-to-GND fault, the device resumes normal operation.
The device monitors the V(OUT) voltage and compares it with the internal reference voltage to detect a short-toGND failure. If V(OUT) falls below V(SG_th_rising) longer than the deglitch time of t(SG_deg), the device asserts the
short-to-GND fault and pulls FAULT low. During the deglitching time period, if V(OUT) rises above V(SG_th_falling), the
timer is reset.
Once the device has asserted a short-to-GND fault, the device turns OFF the output channel and retries
automatically with a small current. When retrying, the device sources a small current I(retry) from IN to OUT to pull
up the LED loads continuously. Once auto-retry detects output voltage rising above V(SG_th_falling), it clears the
short-to-GND fault and resumes normal operation.
7.3.5.5 Single-LED-Short Detection
The TPS92610-Q1 device supports single-LED-short detection by using the SSH and SSL pins. In case there is
no need of this feature, SSH and SSL must be tied together to a resistor divider to avoid false alarms as shown
in Figure 21.
The TPS92610-Q1 device has integrated a precision comparator to monitor a single-LED-short failure. The
comparator uses the bottom LED forward voltage V(SSL) as a reference and monitors the string voltage V(OUT)
with resistor divider R1 and R2 at V(SSH).
If a single-LED short is detected, the device turns off the output channel and retries with a small current I(RETRY).
Once the fault is removed, the device automatically resumes normal operation.
OUT
SSH
VSSL – VSSH > V(SSH_th)
SSL
+
R2
R1
–
VSSL < V(SSL_th)
+
V(SSL_th)
–
Copyright © 2017, Texas Instruments Incorporated
Figure 20. Single-LED Short Detection
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Feature Description (continued)
Use the following equation to calculate the ratio of R1 and R2.
R 2 = (N o. of LE D s - 1) ´ R 1
(2)
By using the resistor divider with values calculated in Equation 2, the voltages of SSH and SSL are then equal to
the forward voltage of a single LED. With built-in comparators, the device can report failure if any of the LEDs is
shorted within this string.
An internal resistor string on SSL and resistors R1 and R2 draw current from OUT. TI recommends total
resistance of R1 and R2 greater than 100-kΩ, so the current has negligible effect on LED luminance.
Even within the same batch of LEDs, the LED forward voltage may vary from one to another. Taking account of
forward voltage differences is necessary to avoid any false faults.
4.5 ± 40V
4.5 ± 40V
TPS92610 ± Q1
EN
EN
TPS92610 ± Q1
EN
SUPPLY
EN
SUPPLY
R(SNS)
DIAGEN
PWM
DIAGEN
PWM
R(SNS)
DIAGEN
IN
PWM
OUT
DIAGEN
IN
PWM
OUT
FAULT
SSH
GND
SSL
R2
FAULT
FAULT
SSH
GND
SSL
R2
FAULT
R1
GND
GND
R1
Copyright © 2017, Texas Instruments Incorporated
Figure 21. Bypass Single-LED Short Detection
Copyright © 2017, Texas Instruments Incorporated
Figure 22. With Single-LED Short Detection
7.3.5.6 Overtemperature Protection
The TPS92610-Q1 device monitors device junction temperature. When the junction temperature reaches thermal
shutdown threshold T(TSD), the output shuts down. Once the junction temperature falls below T(TSD) – T(TSD_HYS),
the device resumes normal operation. During overtemperature protection, the FAULT bus is pulled low.
7.3.6 FAULT Bus Output With One-Fails–All-Fail
The TPS92610-Q1 device has a FAULT bus for diagnostics output. In normal operation, FAULT is weakly pulled
up by an internal pullup current source I(FAULT_pullup) higher than VOH(FAULT). If any fault scenario occurs, the
FAULT bus is strongly pulled low by the internal pulldown current source I(FAULT_pulldown). Once V(FAULT) falls below
VIL(FAULT), all outputs shut down for protection. The faulty channel keeps retrying until the fault scenario is
removed.
If FAULT is externally pulled up with a current larger than I(FAULT_pulldown), the one-fails–all-fail function is disabled
and only the faulty channel is turned off.
The FAULT bus is able to support up to 15 pieces of TPS9261x-Q1, TPS9263x-Q1, or TPS9283x-Q1 devices.
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Feature Description (continued)
Table 1. Fault Table With DIAGEN = HIGH
FAULT BUS
STATUS
FAULT TYPE
DETECTION
MECHANISM
FAULT floating
or externally
pulled up
Open-circuit or
short-to-supply
V(IN) – V(OUT) <
V(OPEN_th_rising)
CHANNEL
STATE
DEGLITCH
TIME
FAULT BUS
FAULT
HANDLING
ROUTINE
FAULT
RECOVERY
On
t(OPEN_deg)
Constantcurrent
pulldown
Device works
normally with
FAULT pin
pulled low.
Device sources
I(retry) current
when PWM is
LOW. Device
keeps output
normal when
PWM is HIGH.
Auto recover
Short-to-ground V(OUT) <
V(SG_th_rising)
On
t(SG_deg)
Constantcurrent
pulldown
Device turns
output off and
retries with
constant
current I(retry),
ignoring the
PWM input.
Auto recover
Single-LED
short
On
t(SS_deg)
Constantcurrent
pulldown
Device turns
output off and
retry with
constant
current I(retry),
ignoring the
PWM input.
Auto recover
On or off
t(TSD_deg)
Constantcurrent
pulldown
Devices turns
output off.
Auto recover
V(SSL) – V(SSH)
> V(SS_th) or
V(SSL) <
V(SSL_th)
Overtemperatur TJ > T(TSD)
e
Externally
pulled low
Device turns output off
Table 2. Fault Table With DIAGEN = LOW
FAULT BUS
STATUS
FAULT TYPE
FAULT floating
or externally
pulled up
Open-circuit or
short-to-supply
DETECTION
MECHANISM
Short-to-ground VOUT <
V(SG_th_rising)
CHANNEL
STATE
DEGLITCH
TIME
FAULT
HANDLING
ROUTINE
FAULT
RECOVERY
Ignored
On
t(SG_deg)
Single-LED
short
Overtemperatur TJ > T(TSD)
e
FAULT BUS
Constantcurrent
pulldown
Device turns
output off and
retries with
constant
current I(retry),
ignoring the
PWM input.
Auto recover
Device turns
output off.
Auto recover
Ignored
On or off
Externally
pulled low
t(TSD_deg)
Constantcurrent
pulldown
Device turns output off
7.4 Device Functional Modes
7.4.1 Undervoltage Lockout, V(SUPPLY)<V(POR_rising)
When the device is in undervoltage lockout mode, the TPS92610-Q1 device disables all functions until the supply
rises above the UVLO-rising threshold.
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Device Functional Modes (continued)
7.4.2 Normal Operation V(SUPPLY) ≥ 4.5 V
The device drives an LED string in normal operation. With enough voltage drop across SUPPLY and OUT, the
device is able to drive the output in constant-current mode.
7.4.3 Low-Voltage Dropout
When the device drives an LED string in low-dropout mode, if the voltage drop is less than open-circuit detection
threshold, the device may report a false open-circuit fault. Set the DIAGEN threshold higher than LED string
voltage to avoid a false open-circuit detection.
7.4.4 Fault Mode
When the device detects an open circuit or a shorted LED, the device tries to pull down the FAULT pin with a
constant current. If the FAULT bus is pulled down, the device switches to fault mode and consumes a fault
current of I(FAULT).
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
In automotive lighting applications, thermal performance and LED diagnostics are always design challenges for
linear LED drivers.
The TPS92610-Q1 device is capable of detecting LED open-circuit, LED short-circuit and single-LED short
failures. To increase current-driving capability, the TPS92610-Q1 device supports using an external a parallel
resistor to help dissipate heat as shown in the following application, Figure 25. This technique provides the lowcost solution of using external resistors to dissipate heat due to high input voltage, and still keeps high accuracy
of the total current output. Note that the one-fails–all-fail feature is not supported by this topology.
8.2 Typical Application
8.2.1 Single-Channel LED Driver With Full Diagnostics
The TPS92610-Q1 device is a potential choice for LED driver for applications with diagnostics requirements. In
many cases, single-LED short diagnostics are mandatory for applications such as sequential turn indicators.
SUPPLY
TPS92610 ± Q1
EN
EN
SUPPLY
R4
R3
I(LED)
R(SNS)
DIAGEN
PWM
DIAGEN
IN
PWM
OUT
FAULT
SSH
GND
SSL
R2
FAULT
R1
GND
Copyright © 2017, Texas Instruments Incorporated
Figure 23. Typical Application Diagram
8.2.1.1 Design Requirements
Input voltage ranges from 9 V to 16 V, LED maximum forward voltage Vfmax = 2.5 V, minimum forward voltage
Vfmin = 1.9 V, current I(LED) = 50 mA.
8.2.1.2 Detailed Design Procedure
Current setting by sense resistor is as described inEquation 1.
R (SNS) =
R (CS _ REG)
I(LED)
= 1.96 W
(3)
LED-string maximum forward voltage = 3 × 2.5 V = 7.5 V.
16
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Typical Application (continued)
With 400-mV headroom reserved for the TPS92610-Q1 device between SUPPLY and OUT, the TPS92610-Q1
device must disable open-circuit detection when the supply voltage is below 7.9 V by using the DIAGEN feature.
V IL(DIAG,min) =
7.9 ´ R 3
R3 + R4
(4)
Set R4 = 10 kΩ, R3 = 65.6 kΩ.
The single-LED short-detection resistor ratio can be calculated as follows.
R2
R1
=2
(5)
If R1 = 50 kΩ, R2 = 100 kΩ
Total device power consumption at worst case is with 16-V input and LEDs at minimal froward voltage.
P(Max) = (V(SUPPLY) - V(CS _ REG) - V(OUT) ) ´ I(LED) + V(SUPPLY) ´ I(Quiescent)
= (16 - 3 ´ 1.9 - 0.098) ´ 0.05 + 16 ´ 0.00025 = 0.5141 W
(6)
8.2.1.3 Application Curve
Ch. 1 = V(OUT)
Ch. 2 = V(PWM)
Ch. 4 = I(OUT)
Figure 24. Output Current With PWM Input
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Typical Application (continued)
8.2.2 Single-Channel LED Driver With Heat Sharing
SUPPLY
TPS92610 ± Q1
EN
DIAGEN
PWM
FAULT
GND
EN
SUPPLY
I(DRIVE) R(SNS)
DIAGEN
I(LED)
IN
R(P)
PWM
OUT
FAULT
SSH
GND
SSL
I(P)
Copyright © 2017, Texas Instruments Incorporated
Figure 25. Heat Sharing With a Parallel Resistor
8.2.2.1 Design Requirements
Input voltage range is 9 V to 16 V, LED maximum forward voltage Vfmax= 2.5 V, minimum forward voltage Vfmin=
1.9 V, current I(LED) = 200 mA.
8.2.2.2 Detailed Design Procedure
Using parallel resistors, thermal performance can be improved by balancing current between the TPS92610-Q1
device and the external resistors as follows. As the current-sense resistor controls the total LED string current,
the LED string current I(LED) is set by V(CS_REG) / R(SNS), while the TPS92610-Q1 current I(DRIVE) and parallel
resistor current I(P) combine to the total current.
Note that the parallel resistor path cannot be shut down by PWM or fault protection. If PWM or one-fails–all-fail
feature is required, TI recommends an application circuit as described in Single-Channel LED Driver With Full
Diagnostics.
In linear LED driver applications, the input voltage variation contributes to most of the thermal concerns. The
resistor current, as indicated by Ohm’s law, depends on the voltage across the external resistors. The
TPS92610-Q1 controls the driver current I(DRIVE) to attain the desired total current. If I(P) increases, the
TPS92610-Q1 device decreases I(DRIVE) to compensate, and vice versa.
While in low-dropout mode, the voltage across the R(P) resistor may be close to zero, so that almost no current
can flow through the external resistor R(P).
When the input voltage is high, the parallel-resistor current I(P) is proportional to the voltage across the parallel
resistor R(P). The parallel resistor R(P) takes the majority of the total string current, generating maximum heat.
The device must prevent current from draining out to ensure current regulation capability.
In this case, the parallel resistor value must be carefully calculated to ensure that 1) enough output current is
achieved in low-dropout mode, 2) thermal dissipation for both the TPS92610-Q1 device and the resistor is within
their thermal dissipation limits, and 3) device current in the high-voltage mode is above the minimal outputcurrent requirement.
Current setting by sense resistor is as described in Equation 7.
R (SNS) =
18
R (CS _ REG)
I(LED)
= 0.49 W
(7)
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Typical Application (continued)
LED-string maximum forward voltage = 3 × 2.5 V = 7.5 V.
Parallel resistor R(P) is recommended to consume 50% of the total current at maximum supply voltage.
V(SUPPLY) V(CS _ REG) V(OUT) 16 3 u 1.9 0.098
| 100:
R(P)
0.5 u I(LED)
0.5 u 0.2
(8)
Total device power consumption is maximum at 16 V input and LED minimal forward voltage.
æ
V(SUPPLY ) - V(CS _ REG) - V(OUT )
P(DEV _ MAX) = (V(SUPPLY ) - V(CS _ REG) - V(OUT ) ) ´ ç I(LED) ç
R (P)
è
= (16 - 3 ´ 1.9 - 0.098) ´ 0.1 + 16 ´ 0.00025 = 1.0242 W
ö
÷ + V(SUPPLY ) ´ I(Quiescent)
÷
ø
(9)
Resistor R(P) maximum power consumption is at 16-V input.
P(RP _ MAX)
V(SUPPLY)
V(CS _ REG)
V(OUT)
R(P)
2
16 3 u 1.9 0.098
100
2
1.04W
(10)
Users must consider the maximum power of both of the device and the parallel resistor.
8.2.2.3 Application Curve
Ch. 1 = V(SUPPLY)
Ch. 2 = V(OUT)
Ch. 3 = I(P)
Ch. 4 = I(LED) V(SUPPLY) increases from 9 V to 16 V
Figure 26. Constant Output Current With Increasing Supply Voltage
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9 Layout
9.1 Layout Guidelines
Thermal dissipation is the primary consideration for TPS92610-Q1 layout. TI recommends good thermal
dissipation area connected to thermal pads with thermal vias.
9.2 Layout Example
SUPPLY
IN
TPS92610-Q1
1
EN
2
SUPPLY
14
DIAGEN
IN
13
3
NC
NC
12
4
PWM
5
NC
OUT
11
NC
10
6
FAULT
SSH
9
7
GND
SSL
8
GND
Copyright © 2017, Texas Instruments Incorporated
Figure 27. TPS92610-Q1 Example Layout Diagram
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10 Device and Documentation Support
10.1 Documentation Support
10.1.1 Related Documentation
For related documentation see the following:
• TPS92610-Q1 EVM User's Guide
• How to Calculate TPS92630-Q1 Maximum Output Current for Automotive Exterior Lighting Applications
• Automotive Linear LED Driver Reference Design for Center High-Mounted Stop Lamp (CHMSL)
• User Guides: Automotive Linear LED Driver Reference Design for Center High-Mounted Stop Lamp (CHMSL)
10.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
10.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
10.4 Trademarks
PowerPAD, E2E are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
10.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
10.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
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11 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the mostcurrent data available for the designated device. This data is subject to change without notice and without
revision of this document. For browser-based versions of this data sheet, see the left-hand navigation pane.
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PACKAGE OPTION ADDENDUM
www.ti.com
28-Dec-2017
PACKAGING INFORMATION
Orderable Device
Status
(1)
TPS92610QPWPRQ1
ACTIVE
Package Type Package Pins Package
Drawing
Qty
HTSSOP
PWP
14
2000
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
Op Temp (°C)
Device Marking
(4/5)
-40 to 125
TP92610
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
Samples
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Feb-2019
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
TPS92610QPWPRQ1
Package Package Pins
Type Drawing
SPQ
HTSSOP
2000
PWP
14
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
330.0
12.4
Pack Materials-Page 1
6.9
B0
(mm)
K0
(mm)
P1
(mm)
5.6
1.6
8.0
W
Pin1
(mm) Quadrant
12.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Feb-2019
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TPS92610QPWPRQ1
HTSSOP
PWP
14
2000
350.0
350.0
43.0
Pack Materials-Page 2
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IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
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Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
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