For further information contact your local STMicroelectronics sales office.

19 October 2018

DB3491 Rev 1

1/4

EVLSRK1000B-TO

SRK1000B adaptive synchronous rectification controller for flyback

converter demonstration board with STF80N10F7

Data brief

Features

 Synchronous rectifier for flyback converter,

with fixed turn-on and adaptive turn-off

 DVS max. operating voltage 90 V

 Max. frequency: 500 kHz

 Internal gate drive for N-channel MOSFET

 SR MOSFET type: STF80N10F7

(100 V - 10 mΩ) TO-220FP

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 kΩ resistor (R5) is provided on

the TON pin that fixes the blanking after the turn-

on to about 0.8 μs.

The board includes the SR MOSFET (TO-220FP

package) and can be easily implemented into an

existing converter to substitute rectifier diodes.

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