Datasheet SRK1001 (STMicroelectronics)

SRK1001
Datasheet Adaptive synchronous rectification controller for flyback converter SO8 package
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 3.7 to 32 V • CC regulation operation down to 2V output supported • Very low quiescent current in low consumption mode (170 µA) • High-voltage sensing input for SR MOSFET drain-source voltage (185 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 minimum TON and TOFF • Low consumption mode entry by DIS pin, by primary side burst-mode detection or by detection of SR MOSFET conduction lower than programmed min. TON • SO8 package
Applications
• AC-DC adapters • Battery chargers / quick chargers • USB power delivery (profile 4) • Industrial SMPS
Product status link
SRK1001
Description Product summary
The SRK1001 controller is designed for secondary side synchronous rectification Order code SRK1001 (SR) in flyback converters, suitable for operation in QR and mixed CCM/DCM fixed frequency circuits. Package SO8 It provides a high-current gate-drive output capable of driving N-channel Power Packing Tape and reel 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 then switched off as current approaches zero. The fast turn-on with minimum delay and 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 DIS pin is pulled up by the user, or when the SR MOSFET conduction falls below the programmed minimum TON. This improves the converter efficiency at light load, where synchronous rectification is no longer beneficial. After the converter restarts switching or the DIS pin goes low again and 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.
DS13155
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Rev 1
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November 2019
www.st.com For further information contact your local STMicroelectronics sales office. Document Outline 1 Block diagram and pin connection 2 Maximum ratings 3 Typical application schematic 4 Electrical characteristics 5 Operation description 5.1 Drain voltage sensing 5.2 Turn-on 5.3 Minimum TON programming 5.4 Adaptive turn-off and TIMER 5.4.1 Fixed frequency mixed DCM/CCM operation 5.4.2 QR operation (with valley skipping) 5.4.3 Fixed frequency DCM operation 5.4.4 Variable frequency CCM operation 5.5 Minimum TOFF programming 5.6 Start-up phase 5.7 Low consumption mode operation: sleep-mode, burst mode, disable state 5.8 DIS/SYNC pin functions 5.9 VAUX pin operation in CC regulation 5.9.1 Example for parameter calculations 5.10 Operation in CC regulation and short circuit 5.11 Adaptive gate drive 6 Layout guidelines 7 Package mechanical data Revision history