NXP TEA1892 GreenChip Synchronous Rectifier Controller Data Sheet

TEA1892ATS
GreenChip synchronous rectifier controller
Rev. 1 — 10 April 2014
Product data sheet
1. General description
The TEA1892ATS is a member of the new generation of Synchronous Rectifier (SR)
controller ICs for switched mode power supplies. Its high level of integration allows the
design of a cost-effective power supply with a very low number of external components.
The TEA1892ATS is a controller IC dedicated to synchronous rectification on the
secondary side of discontinuous conduction mode and quasi-resonant flyback converters.
The TEA1892ATS is fabricated in a Silicon-On-Insulator (SOI) process.
2. Features and benefits
2.1 Distinctive features





Accurate synchronous rectification functionality
Wide supply voltage range (8.5 V to 38 V)
High level of integration, resulting in a very low external component count
High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
Selectable regulation level for driver stage
2.2 Green features
 Low current consumption
 High system efficiency from no-load to full load
2.3 Protection features
 UnderVoltage Protection (UVP)
3. Applications
 The TEA1892ATS is intended for adapters. The device can also be used in all other
discontinuous conduction mode systems and quasi-resonant flyback systems that
demand a highly efficient and cost-effective solution.
TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
4. Ordering information
Table 1.
Ordering information
Type number
Package
TEA1892ATS/1
Name
Description
Version
TSOP6
plastic surface-mounted package; 6 leads
SOT457
5. Block diagram
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TEA1892ATS block diagram
TEA1892ATS
Product data sheet
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Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
6. Pinning information
6.1 Pinning
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TEA1892ATS pin configuration (TSOP6)
6.2 Pin description
Table 2.
TEA1892ATS
Product data sheet
Pin description
Symbol
Pin
Description
SRSENSE
1
synchronous timing input
GND
2
ground
VCC
3
supply voltage
SELREG
4
selection input for driver regulation level
n.c
5
not connected
DRIVER
6
driver output for SR MOSFET
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Rev. 1 — 10 April 2014
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
7. Functional description
7.1 Introduction
The TEA1892ATS is the controller for synchronous rectification used in discontinuous
conduction mode and quasi-resonant flyback converters.
7.2 Start-up and UnderVoltage LockOut (UVLO)
The IC leaves the undervoltage lockout state and activates the synchronous rectifier
circuitry when the voltage on the VCC pin is above 8.5 V (typical). When the voltage drops
below 8.0 V (typical), the undervoltage lockout state is entered again and the SR driver
output is actively kept low.
7.3 Synchronous rectification
After a negative voltage lower than Vact(drv) (220 mV typical) is sensed on the SRSENSE
pin, the driver output voltage is driven HIGH. Then the external MOSFET is switched on.
When the SRSENSE voltage rises to Vreg(drv) (42 mV/30 mV) the driver output voltage
is regulated to maintain the Vreg(drv) on the SRSENSE pin. When the SRSENSE voltage is
above the Vdeact(drv) level (12 mV typical), the driver output is pulled to ground.
After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked
during the tact(sr)(min) (0.8 s typical). This action eliminates false switch-off due to high
frequency ringing at the start of the secondary stroke.
When the voltage on the SRSENSE pin is Vreg(drv), the driver output voltage is reduced.
This reduction enables the external power switch to be switched off quickly when the
current through the switch reaches zero. The zero current switch-off removes the need for
a separate Standby mode to maintain high efficiency during the no-load operation. The
zero current is detected by sensing a Vdeact(drv) (12 mV typical) level on the SRSENSE
pin (see Figure 3).
TEA1892ATS
Product data sheet
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Rev. 1 — 10 April 2014
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
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Synchronous rectification signals
The level of the driver regulation voltage Vreg(drv) can be selected using the SELREG pin.
When this SELREG pin is grounded, the typical Vreg(drv) equals 42 mV. When the
SELREG pin is left open, the Vreg(drv) level equals 30 mV.
Internally, the SELREG pin has a pull-up current source of 10 A. When this pin is short
circuited to ground, the pin selects the lowest Vreg(drv). If the pin is left open, the highest
Vreg(drv) value is selected.
7.4 Supply management
All internal reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.5 Driver
The driver circuit to the external power MOSFET gate has a typical source capability of
400 mA and a typical sink capability of 2.7 A. These capabilities permit fast switch-on and
switch-off of the power MOSFET for efficient operation. The source stage is coupled to the
timer (see Figure 1). When the timer has finished, the source capability is reduced to a
small current (5 mA typical) capable of keeping the driver output voltage at its level.
The output voltage of the driver is limited to 10 V (typical). This high output voltage drives
all MOSFET brands to the minimum on-state resistance.
During start-up conditions (VCC < Vstartup) and undervoltage lockout the driver output
voltage is actively pulled low.
TEA1892ATS
Product data sheet
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Rev. 1 — 10 April 2014
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
8. Limiting values
Table 3.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are measured
with respect to ground (pin 2); positive currents flow into the chip. The voltage ratings and current
ratings are valid provided the other ratings are not violated.
Symbol
Parameter
Conditions
Min
Max
Unit
VCC
supply voltage
continuous
0.4
+38
V
VSRSENSE
voltage on pin
SRSENSE
continuous
-
120
V
VSELREG
voltage on pin SELREG
continuous
0.4
5
V
IDRIVER
current on pin DRIVER
duty cycle < 10 %
0.8
+3
A
ISRSENSE
current on pin
SRSENSE
3
-
mA
-
0.27
W
Voltages
Currents
General
Tamb < 80 C
Ptot
total power dissipation
Tstg
storage temperature
55
+150
C
Tj
junction temperature
40
+150
C
2
+2
kV
500
+500
V
VESD
electrostatic discharge
voltage
[1]
human body model; JEDEC
Class 2; all pins
charged device model; JEDEC
Class 3; all pins
[1]
Equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
9. Thermal characteristics
Table 4.
TEA1892ATS
Product data sheet
Thermal characteristics
Symbol
Parameter
Conditions
Typ
Unit
Rth(j-a)
thermal resistance from junction
to ambient
JEDEC test board
259
K/W
Rth(j-c)
thermal resistance from junction
to case
JEDEC test board
152
K/W
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Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
10. Characteristics
Table 5.
Characteristics
Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
8.2
8.5
8.8
V
0.35
0.5
0.65
V
0.2
0.25
0.4
mA
0.8
1
1.2
mA
260
220
180
mV
resistance between pins SELREG
and GND < 15 k
55
42
30
mV
resistance between pins SELREG
and GND > 700 k
38
30
22
mV
Supply voltage management (pin VCC)
Vstartup
start-up voltage
Vhys
hysteresis voltage
ICC(oper)
operating supply current
[1]
VCC = 8 V (VCC < Vstartup)
under normal operation; no-load
on pin DRIVER
Synchronous rectification sense input (pin SRSENSE)
Vact(drv)
driver activation voltage
Vreg(drv)
driver regulation voltage
Vdeact(drv)
driver deactivation voltage
-
12
-
mV
td(act)(drv)
driver activation delay time
50
75
100
ns
tact(sr)(min)
minimum synchronous
rectification active time
0.6
0.8
1.0
s
Io(SELREG)
output current on pin
SELREG
12
10
8
A
during minimum synchronous
rectification time
0.45
0.4
0.35
A
minimum synchronous
rectification time has ended
6
5
4
mA
voltage on pin DRIVER = 2 V
1
1.4
-
A
voltage on pin DRIVER = 9.5 V
2.2
2.7
-
A
9
10
12
V
400
-
-
kHz
VSELREG = 2.5 V
Driver (pin DRIVER)
Isource
source current
VCC = 15 V; voltage on pin
DRIVER = 2 V
sink current
Isink
VCC = 15 V
Vo(max)
maximum output voltage
fsw(max)
maximum switching
frequency
[1]
VCC = 15 V
The VCC stop voltage is Vstartup  Vhys.
TEA1892ATS
Product data sheet
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Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
11. Application information
A switched mode power supply with the TEA1892ATS consists of a primary side
discontinuous conduction mode flyback controller, a transformer, and an output stage with
a feedback circuit. A MOSFET (Qsec) is used for low conduction losses in the output state.
The TEA1892ATS controls this MOSFET.
The timing for the synchronous rectifier switch is derived from the voltage sensed on the
SRSENSE pin. The resistor in the SRSENSE connection protects the TEA1892ATS from
excessive voltages. The RSRSENSE resistor is typically 1 k. Higher values can impair
correct timing, lower values do not provide sufficient protection.
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Application diagram high side rectification
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Fig 5.
TEA1892ATS
Product data sheet
Application diagram low side rectification
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
12. Package outline
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TEA1892ATS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
13. Revision history
Table 6.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
TEA1892ATS v.1
20140410
Product data sheet
-
-
TEA1892ATS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
10 of 13
TEA1892ATS
NXP Semiconductors
GreenChip synchronous rectifier controller
14. Legal information
14.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
14.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
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Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
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sheet, which is available on request via the local NXP Semiconductors sales
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Limited warranty and liability — Information in this document is believed to
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Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
TEA1892ATS
Product data sheet
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authorized or warranted to be suitable for use in life support, life-critical or
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Applications — Applications that are described herein for any of these
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representation or warranty that such applications will be suitable for the
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Customers are responsible for the design and operation of their applications
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damage, costs or problem which is based on any weakness or default in the
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the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
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All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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NXP Semiconductors
GreenChip synchronous rectifier controller
Export control — This document as well as the item(s) described herein
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Non-automotive qualified products — Unless this data sheet expressly
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In the event that customer uses the product for design-in and use in
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Translations — A non-English (translated) version of a document is for
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14.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
GreenChip — is a trademark of NXP Semiconductors N.V.
15. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
TEA1892ATS
Product data sheet
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Rev. 1 — 10 April 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
12 of 13
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TEA1892ATS
GreenChip synchronous rectifier controller
16. Contents
1
2
2.1
2.2
2.3
3
4
5
6
6.1
6.2
7
7.1
7.2
7.3
7.4
7.5
8
9
10
11
12
13
14
14.1
14.2
14.3
14.4
15
16
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1
Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1
Protection features . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pinning information . . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional description . . . . . . . . . . . . . . . . . . . 4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Start-up and UnderVoltage LockOut (UVLO) . . 4
Synchronous rectification . . . . . . . . . . . . . . . . . 4
Supply management. . . . . . . . . . . . . . . . . . . . . 5
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal characteristics . . . . . . . . . . . . . . . . . . 6
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information. . . . . . . . . . . . . . . . . . . 8
Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 10
Legal information. . . . . . . . . . . . . . . . . . . . . . . 11
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 11
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Contact information. . . . . . . . . . . . . . . . . . . . . 12
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP Semiconductors N.V. 2014.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 10 April 2014
Document identifier: TEA1892ATS
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