EVLSRK1000B-TO STMicroelectronics

EVLSRK1000B-TO SRK1000B adaptive synchronous rectification controller for flyback converter demonstration board with STF80N10F7 Data brief Description The EVLSRK1000B-TO 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 the TON pin that fixes the blanking after the turn- on to about 0.8 s. The board includes the SR MOSFET (TO-220FP package) and can be easily implemented into an existing converter to substitute rectifier diodes. Features Synchronous rectifier for flyback converter, with fixed turn-on and adaptive turn-off V range: 3.5 V to 32 V CC DVS max. operating voltage 90 V Max. frequency: 500 kHz Internal gate drive for N-channel MOSFET SR MOSFET type: STF80N10F7 (100 V - 10 m) TO-220FP 19 October 2018 DB3491 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com% &7-43, 5 0 +). 50 7 45 / 8 / , 43 8 Electrical schematic EVLSRK1000B-TO Electrical schematic Figure 1. EVLSRK1000B-TO electrical schematic 4 4 / 9 6 % 7 4 5 &3 %) 2/4 DB3491 Rev 1 + % 3 / . 3 % 6 %7 2 3 (/ 3 3 / . (% / . 3 / .