datasheet for L5107G-P16-T by Unisonic Technologies Company Limited

datasheet for L5107G-P16-T by Unisonic Technologies Company Limited
UNISONICTECHNOLOGIESCO., LTD
L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
CON ST AN T CU T T EN T BOOST
CON T ROLLER FOR DRI V I N G
H I GH POWER LEDS

DESCRI PT I ON
The UTC L5107 is a high powered PWM boost converter
optimized for constant current applications such as driving one or
more strings of high power LEDs. The powerful drive circuitry can
deliver up to 70W to the LED system.
The output current can be set by an external resistor
connected the IADJ pin and GND. This average current can be
reduced by applying a PWM signal to the PWMD pin. The UTC
L5107 offers a dither feature to reduce EMI.
The UTC L5107 has a large input voltage range from 6V to
45V and the switching frequency can be set by an external
resistor between 100kHz and 1MHz for diffident LED systems. To
protect the device over voltage protection circuit and under
voltage lock-out circuit have been incorporated as well as thermal
shutdown circuit.
The UTC L5107 is available in the HTSSOP 16-pin TSSOP
package.

FEAT U RES
* Input voltage range: 6V~45V
* Feedback voltage: 0.25V±3%
* Maximum out power of 70W
* Programmable switching frequency and LED drive current
* Ultra low EMI via dithering on the UTC L5107
* Single pin for PWM dimming
* Protection circuit:
Over voltage protection circuit
Over temperature protection circuit
Under-voltage Lock-out circuit
* Accurate over the -40~125°C temperature range

ORDERI N G I N FORM AT I ON
Ordering Number
Lead Free
Halogen Free
L5107L-P16-T
L5107G-P16-T
L5107L-P16-R
L5107G-P16-R
Note: xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
TSSOP-16
TSSOP-16
Tube
Tape Reel
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L5107
Preliminary

PI N CON FI GU RAT I ON

PI N DESCRI PT I ON
PIN NO.
1
PIN NAME
NC
2
VIN
3
EN
4
PWMD
5
COMP
6
IADJ
7
FS
8
9
AGND
NC
10
SYNC
11
IS
12
OVP
13
14
PGND
DRV
15
VDD
16
NC
EPAD
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
No Connection.
Power Input Pin. The external voltage supply is connected to this pin. A 4.7µF/50V
capacitor must be connected across this pin and GND.
Enable Control Pin. Pull high to turn on. A 100k resistor can be connected across this
pin and VIN.
Dimming PWM Control Pin. Logic High terminates the output power. Logic Low starts
up the output power.
Error Amp Output Pin. A 10nF capacitor must be connected across this pin and GND
for external compensation.
Output Feedback Pin. The reference is 0.25V.
Timing Resistance Connection Pin. Connected to a Resistor to determine the operating
frequency.
Analog Ground.
No Connection.
Frequency Synchronize Pin. The UTC L5107 can be Connected together by this pin to
synchronize multiple converters.
Current Sense Pin. Connected to external current sense resistor which in turn is
connected to the source of the external FET as well as an external slope compensation
resistor.
OVP Divider Connect Pin. Connect the top of the divider string to the output. If the load
is disconnected, the output voltage will rise until OVP reaches 1.25V and then will
regulate around this point.
Power Ground.
Drive Output. Connect to the gate of external FET.
VDD Filter Connect Pin. Connect a 10 F/10V capacitor to GND. It is also the positive
supply for the Driver. Do not connect an external load to this pin.
No Connect.
Connect to AGND.
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DI AGRAM
VIN
D1
L1
LED0
CIN
COUT
LDO
VIN
EN
LED1
VDD
ENABLE
DRV
Q1
DRV
PGND
PWND
PWMcontrol
OVP
LED2
1.2V
OVP
COMP
CCOMP
IADJ
RSCL
Err
0.25V
FS
OSC
RAMP
RADJ
IS
RCS
OSC/RAMP
SYNC
RFS
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLU T E M AX I M U M RAT I N G(N ot e 1 )
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
+48
V
Enable Pin Voltage
VEN
-0.3~+6
V
IADJ Voltage
VADJ
+6
V
Storage Temperature
TS
-65~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

T H ERM AL DAT A(N ot e 3 )
PARAMETER
PACKAGE
Junction Thermal Resistance

SYMBOL
JA
RATINGS
36.5
UNIT
° /W
OPERAT I N G RAT I N GS(N ot e 3 )
PARAMETER
Supply Voltage
Junction Temperature
SYMBOL
VIN
TJ
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RATINGS
+6~+45
-40~+125
UNIT
V
°C
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
ELECT RI CAL CH ARACT ERI ST I CS(N ot e 4 )
(VIN=12V, VEN=3.6V, L=47µH, C=4.7µF, TJ=25°C, Bold values indicate -40°C≤TJ≤+125°C, unless noted)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Supply Voltage Range
VIN
6
45
V
Under Voltage Lockout
UVLO
3.5
4.9
5.5
V
VFB>275mV (to ensure device is not
Quiescent Current
IVIN
3.2
10
mA
switching)
Shutdown Current
ISD
VEN=0V
30
A
Room temperature (3%)
242.5
250
257.5
mV
Feedback Voltage (at IADJ)
VIADJ
-40°C≤TJ≤+125°C (5%)
237.5
250
262.5
mV
Feedback Input Current
IADJ
VFB=250mV
1.2
3
A
Line Regulation
SV
VIN=12V~24V
2
%
Load Regulation
SI
VOUT to 2×VOUT
2
%
Maximum Duty Cycle
DMAX
88
%
Turn ON
1.15
1.5
Enable Threshold
VEN
V
Turn OFF
0.4
1.1
Enable Pin Current
IEN
VEN=3.3V, REN=100k
17
30
A
Turn ON
0.75
1.5
PWMD Threshold
VPWM
V
Turn OFF
0.4
0.7
PWMD Frequency Range
fPWMD
L=47 H, C=4.7 F (Note 5)
0
500
Hz
109
REREQ=82.5k
Programmable Oscillator
fSW
REREQ=21k
360
400
440
kHz
Frequency
REREQ=8.25k
950
Low EMI
FDITHER Frequency dither shift from nominal
±12
%
Current Limit Threshold Voltage
VSENS
RSENSE=390
0.315 0.45 0.585
V
ISENSE Peak Current Out
ISENSE
RSENSE=390
250
A
Over Voltage Protection
VOVP
1.203 1.24 1.277
V
Sink
2.4
3.5
Driver Impedance
RON
Source
2
Driver Voltage High
VDRH
VIN=12V
7
9
11
V
Over-Temperature Threshold
TJ
150
°C
Shutdown
Thermal Shutdown
TH
Hysteresis
5
°C
Notes: 1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with
100pF.
3. The device is not guaranteed to function outside its operating rating.
4. Specification for packaged product only.
5. Guaranteed by design
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
FU N CT I ON AL DESCRI PT I OM
The UTC L5107 DC-DC converter is based on a peak current mode PWM architecture which regulates the
feedback voltage at 0.25V under normal operating conditions. The constant output current converter is the preferred
method for driving LEDs. Figure 2 shows the typical application schematic.
The UTC L5107 configured as a boost controller can allow for the design of multiple LEDs in series to help
maintain color and brightness.
The input voltage range of the UTC L5107 is very wide, from 6V to 45V. In addition, the LED current and the
switching frequency can be programmed to a wide range of values through the external resistors for diffident LED
systems. The UTC L5107 can also control the brightness of the LEDs through its PWMD pin.

POWER T OPOLOGY
Constant Output Current Controller
The UTC L5107 as a peak current mode boost controller has been designed to provide a constant output current.
In the boost configuration, the output can be set from VIN up to 100V.
This LED driver features a built-in soft-start circuitry in order to prevent start-up surges. Other protection features
include:
* Current Limit (ILIMIT)-Current sensing for over current and overload protection
* Over Voltage Protection (OVP)-Output over voltage protection to prevent operation above a safe upper limit
* Under Voltage Lockout (UVLO)-UVLO designed to prevent operation at very low input voltages
Setting the LED Current
The current through the LED string is set by the resistor, RADJ. This value can be calculated using Equation 1:
ILED 
Eq. (1)
0.25V
RADJ
VDD
VDD is an internal linear regulator power supply for the internal circuitry of the UTC L5107. A 10 F ceramic bypass
capacitor is required at the VDD pin. This pin is for filtering only and should not connect an external load to this pin.
Soft Start
A soft start build in the boost switching converter is used to limit the inrush current from the line supply. The soft
start delay can be set using the compensation capacitor (CCOMP in Figure 2).
A 10nF ceramic capacitor will be OK at all operating conditions.
Oscillator and Switching Frequency Selection
In the UTC L5107, the switching frequency can be set by choosing the appropriate value for the resistor, RFS
according to Equation 2:
RFSK
Eq. (2)
1.035
7530 

kHz  
F
SW

  
Dithering
The UTC L5107 has a feature which dithers the switching frequency by ±10%. The purpose of this dithering is to
help achieve a spread spectrum of the conducted EMI noise. This can allow for an overall reduction in noise
emission by approximately 10dB.
LED Dimming
The UTC L5107 of LED drivers can dim the brightness of the LED string. A PWM input signal of up to 500Hz can
be applied to the PWMD pin (see Figure 2) to pulse the LED string ON and OFF. It is recommended to use PWM
dimming signals above 120Hz to avoid any recognizable flicker by the human eye. PWM dimming is the preferred
way to dim a LED in order to prevent color/wavelength shifting, as occurs with analog dimming. The output current
level remains constant during each PWMD pulse.
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
POWER T OPOLOGY (Cont .)
Output Over Voltage Protection (OVP)
The UTC L5107 provides an OVP circuitry with a reference value of 1.25V in order to protect the system from an
over voltage fault condition. This OVP point can be programmed through the use of external resistors (R1 and R2 in
Figure 2). This OVP voltage can be calculated using Equation 3:
VOVP 
Eq. (3)
1.25  (R1  R2 )
R2
Current Limit
The UTC L5107 features a current limit protection feature to prevent any current runaway conditions. The current
limit circuitry monitors current on a pulse by pulse basis. It limits the current through the inductor by sensing the
voltage across RCS. When 0.45V is present at the IS pin, the pulse is truncated. The next pulse continues as
normally until the IS pin reaches 0.45V and it is truncated once again. This will continue until the output load is
decreased.
Select RCS using Equation 4:
RCS 
Eq. (4)
VOUT
0.45
- VINMIN   D
 ILPK_LIMIT
L  FSW
MAX
Slope Compensation
The UTC L5107 requires slope compensation for the peak current mode controller. The UTC L5107 uses an
external resistor, RSLC for slope compensation. The ability to set the proper slope compensation through the use of a
single external component results in design flexibility. Select RSLC using Equation 5:
RSLC 
Eq. (5)
VOUT
MAX  VINMIN   RCS
L  250  FSW
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L5107

Preliminary
LINEAR INTEGRATED CIRCUIT
T Y PI CAL APPLI CAT I ON CI RCU I T
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L5107
Preliminary
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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