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19 October 2018 DB3427 Rev 1 1/4
EVLSRK1000-PF
SRK1000 adaptive synchronous rectification controller for flyback
converter demonstration board with logic level SR MOSFET
Data brief
Features
Synchronous rectifier for flyback converter,
with fixed turn-on and adaptive turn-off
VCC range: 3.5 V to 32 V
DVS max. operating voltage 90 V
Max. frequency: 500 kHz
Internal gate-drive for N-channel MOSFET
SR MOSFET type: FDMS86103L logic level
(100 V - 12 mΩ) PowerFLAT 5 x 6 package
Description
The EVLSRK1000-PF is a demonstration board,
designed for evaluation of the SRK1000
synchronous rectification controller.
The SRK1000 implements a control scheme
specific for secondary-side synchronous
rectification in flyback converters and provides
high-current gate-drive outputs for driving the 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 (PowerFLAT
5 x 6 package) and can be easily implemented
into an existing converter to substitute rectifier
diodes.
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