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IRDC3640
USER GUIDE FOR IR3640 EVALUATION BOARD
DESCRIPTION
The IR3640 is a PWM controller for use in
high performance synchronous Buck DC/DC
applications. This is designed to drive a pair
of external NFETs using a programmable
switching frequency up to 1.5MHz in voltage
mode. It is housed in a in 20 Lead 3x4
MLPQ package.
Key features offered by the IR3640 include
programmable soft-start ramp, Power Good ,
thermal protection, over voltage and over
current protection, programmable switching
An output over-current protection function is
implemented by sensing the voltage developed
across the on-resistance of the synchronous
rectifier MOSFET for optimum cost and
performance.
This user guide contains the schematic and bill
of materials for the IR3640 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed application
information for IR3640 is available in the
IR3640 data sheet.
frequency, tracking input, enable input, input
under-voltage lockout for proper start-up,
and pre-bias start-up.
BOARD FEATURES
? V in = +12V (13.2V Max)
? V cc = +5V (5.5V Max)
? V out = +1.8V @ 0- 25A
? F s = 600kHz
? L = 0.33uH
? C in = 4x10uF (ceramic 1210) + 2x330uF (electrolytic)
? C out = 10x47uF (ceramic 0805)
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