EVLSRK1000B-PF STMicroelectronics

EVLSRK1000B-PF SRK1000B adaptive synchronous rectification controller for flyback converter demonstration board with logic level SR MOSFET Data brief Description The EVLSRK1000B-PF is a demonstration board, designed for evaluation of the SRK1000B synchronous rectification controller. The SRK1000B 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 applications and in fixed frequency (FF) mixed DCM-CCM applications. The board is provided with a setting suitable for QR applications. To use in FF applications, a 100 pF capacitor needs to be added in C4. A 68 k resistor (R5) is provided on Features the TON pin that fixes the blanking after the turn- Synchronous rectifier for flyback converter, on to about 0.8 s. with fixed turn-on and adaptive turn-off The board includes the SR MOSFET (PowerFLAT V range: 3.5 V to 32 V CC 5 x 6 package) and can be easily implemented DVS max. operating voltage 90 V into an existing converter to substitute rectifier diodes. Max. frequency: 500 kHz Internal gate drive for N-channel MOSFET SR MOSFET type: FDMS86103L logic level (100 V - 12 m) PowerFLAT 5 x 6 package 19 October 2018 DB3428 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com% &7-43, 1 +). 50 7 - 8 / , 43 8 Electrical schematic EVLSRK1000B-PF Electrical schematic Figure 1. EVLSRK1000B-PF electrical schematic 4 4 / 9 6 % 7 4 5 %4. %&3 ) 2/4 DB3428 Rev 1 + % 3 / . 3 % 6 %7 2 3 (/ 3 / . (% / . 3 / .