STMicroelectronics SRK1000 Switching Controller
STMicroelectronics SRK1000 Switching Controller is intended for secondary side Synchronous Rectification (SR) in flyback converters. This switching controller provides high-current gate drive output that is capable of driving N-channel Power MOSFETs. The SR MOSFET is switched on as soon as current starts flowing through the diode and it is then switched off as current approaches zero. This 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. The STMicroelectronics SRK1000 Switching Controller is suitable for operation in QR and mixed CCM/DCM fixed frequency circuits. Applications include battery chargers, quick chargers, adapters, and USB power delivery.
Features
- Secondary side SR controller optimized for a flyback converter
- Suitable for QR and mixed CCM/DCM fixed frequency operation
- Wide VCC operating voltage range of 3.75V to 32V
- CC regulation operation down to 2V output supported
- Very low quiescent current in low consumption mode (160μA)
- High-voltage sensing input for SR MOSFET drain-source voltage (100V AMR)
- Operating frequency up to 300kHz
- High-current gate-drive output for N-MOSFET
- Fast turn-on with minimum delay time and adaptive turn-off logic
- Programmable (minimum) TON and fixed (minimum) TOFF (3 options: SRK1000, SRK1000A, and SRK1000B)
- Low consumption mode entry by primary side burst-mode detection
- SOT23-6L package
Applications
- Battery chargers / quick chargers
- Adapters
- USB power delivery
SRK1000 Internal Block Diagram
Rise and Fall Time Definition
Development Tools
STMicroelectronics EVLSKR1000x Development Tools
Evaluate the SRK1000/B synchronous rectification controller.
STMicroelectronics EVAL-STCH03-45W Evaluation Board
45W/12V isolated power supply developed for general-purpose applications.
Published: 2018-11-20
| Updated: 2024-02-15