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Evaluation board: SRK2001 adaptive synchronous rectification
controller for LLC resonant converters with STP120N4F6
Features
Synchronous rectifier for LLC resonant
converter, with adaptive turn-on and turn-off
V
CC
range: 4.5 V to 32 V
Max frequency: 500 kHz
Dual gate drive for N-channel MOSFETs
(strd level driver)
SR MOSFET type: STP120N4F6 (40 V – 4.3
mΩ) TO-220
RoHS compliant
Description
The STEVAL-ISA165V1 is a product evaluation
board, designed to demonstrate the performance
of the SRK2001 synchronous rectification
controller. The SRK2001 implements a control
scheme specific for secondary-side synchronous
rectification in LLC resonant converters that use
a transformer with center-tap secondary winding
for full-wave rectification. It provides two high-
current gate-drive outputs (for driving N-channel
power MOSFETs). Each gate driver is controlled
separately and an interlock logic circuit prevents
the two synchronous rectifier (SR) MOSFETs
from conducting simultaneously. Device
operation is based on adaptive algorithms for
both turn-on and turn-off of SR MOSFETs. During
fast load transitions or during above resonance
operation, a further turn-off mechanism is
provided, based on a ZCD_OFF comparator that
triggers the gate drive circuit for very fast
MOSFET turn-off. The board includes two SR
MOSFETs (in a TO-220 package) and can be
easily implemented in an existing converter as a
substitute for rectifier diodes.
