Description
The EVLSRK1001-TO is a demonstration board, designed for evaluation of the SRK1001 synchronous rectification controller. The SRK1001 implements a control scheme specific for secondary-side synchronous rectification in flyback converters and provides high-current gate-drive outputs for driving N-channel Power MOSFET. The device can operate both in quasi-resonant (QR) applications and in fixed frequency (FF) mixed DCM-CCM applications. The board is provided with a setting suitable for QR application. To use in FF applications, a 100 pF capacitor needs to be added in C3. A 120 kΩ resistor (R3) is provided on the TON pin that fixes the blanking after the turn-on to about 1.44 µs. The blanking time after turn-off is set to 3 μs through a 100 kΩ resistor (R4) on TOFF pin. In order to use the DIS/SYNC pin functionality, the user has to remove the zero ohm resistor R9: the PCB already provides a npn transistor connected to this pin for remote ON/OFF. The board includes the SR MOSFET (TO220FP package) and can be easily implemented into an existing converter to substitute rectifier diodes. Product status link EVLSRK1001-TO SRK1001 adaptive synchronous rectification controller for flyback converter demonstration board with SR MOSFET EVLSRK1001-TO Data brief DB3956 - Rev 1 - October 2019 For further information contact your local STMicroelectronics sales office.

Features
■ Synchronous rectifier for flyback converter, with fixed turn-on and adaptive turn- off
■ Vcc range: 3.5 V to 32 V
■ DVS sensing voltage: 185V AMR
■ Max frequency: 500 kHz
■ Internal gate drive for N-channel MOSFET
■ SR MOSFET type: FDPF190N15A (150 V – 19 mΩ) TO220FP