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SRK1000B Datasheet

Adaptive synchronous rectification controller

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SRK1000 / SRK1000A /
SRK1000B
Adaptive synchronous rectification controller for flyback converter
Datasheet - production data
SOT23-6L
Features
Secondary side synchronous rectification
controller optimized for flyback converter
Suitable for QR and mixed CCM/DCM fixed
frequency operation
Wide Vcc operating voltage range 3.75 to 32 V
CC regulation operation down to 2 V output
supported
Very low quiescent current in low consumption
mode (160 μA)
High-voltage sensing input for SR MOSFET
drain-source voltage (100 V AMR)
Operating frequency up to 300 kHz
High-current gate-drive output for N-MOSFET
Fast turn-on with minimum delay time and
adaptive turn-off logic
Programmable min. TON and fixed min. TOFF (3
options: SRK1000, SRK1000A, SRK1000B)
Low consumption mode entry by primary side
burst-mode detection or by detection of SR
MOSFET conduction lower than programmed
min TON
SOT23-6L package
Applications
Battery chargers / quick chargers
Adapters
USB power delivery (profile 3)
Description
The SRK1000 is a controller intended for
secondary side synchronous rectification (SR) in
flyback converters, suitable for operation in QR
and mixed CCM/DCM fixed frequency circuits.
It provides a high-current gate-drive output,
capable of driving N-channel Power MOSFETs.
The control scheme of this IC is such that the SR
MOSFET is switched on as soon as current starts
flowing through its body diode and it is then
switched off as current approaches zero.
The fast turn-on, with minimum delay, and the
innovative adaptive turn-off logic allow
maximizing the conduction time of the SR
MOSFET and eliminating the effect of parasitic
inductance in the circuit.
The device enters low consumption mode when it
detects primary controller burst-mode operation,
or when the SR MOSFET conduction becomes
lower than the programmed minimum TON. In this
way, converter efficiency improves at light load
where synchronous rectification is no longer
beneficial.
After the converter restarts switching or the IC
detects that the current conduction in the rectifiers
has increased 20% above the min TON
programmed value, the IC exits low consumption
mode and resumes switching operation.
Table 1. Device summary
Part number
Package
Packing
SRK1000
SRK1000ATR
SOT23-6L
Tape and reel
SRK1000BTR
January 2019
This is information on a product in full production.
DS12787 Rev 2
1/27
www.st.com


STMicroelectronics Electronic Components Datasheet

SRK1000B Datasheet

Adaptive synchronous rectification controller

No Preview Available !

Contents
Contents
SRK1000 / SRK1000A / SRK1000B
1 Block diagram and pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Drain voltage sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Minimum TON programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Adaptive turn-off and TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5 Minimum TOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.6 Start-up phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.7 Low consumption mode operation: sleep mode and burst mode . . . . . . . 17
5.8 VAUX pin operation in CC regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.9 Operation in CC regulation and short-circuit . . . . . . . . . . . . . . . . . . . . . . 21
5.10 Adaptive gate drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/27 DS12787 Rev 2


Part Number SRK1000B
Description Adaptive synchronous rectification controller
Maker STMicroelectronics
Total Page 27 Pages
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