STEVAL-ISA169V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Dual gate drive for N-channel MOSFETs

STEVAL-ISA169V1
Evaluation board: SRK2001L adaptive synchronous rectification
controller for LLC resonant converters with STL140N4LLF5
Data brief
Features
 Synchronous rectifier for LLC resonant
converter, with adaptive turn-on and turn-off
 VCC range: 4.5 V to 32 V
 Max frequency: 500 kHz
 Dual gate drive for N-channel MOSFETs
(logic level driver)
 SR MOSFET type: STL140N4LLF5 (40 V –
3.1 mΩ) PowerFlat
Description
The STEVAL-ISA169V1 is a product evaluation
board designed to demonstrate the performance
of the SRK2001L synchronous rectification
controller. The SRK2001L 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 (PowerFlat package) and can be
easily implemented in an existing converter as a
substitute for rectifier diodes.
April 2015
DocID027705 Rev 1
1/4
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