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USER GUIDE FOR CURRENT SHARING IRDC3622S EVALUATION
BOARD USING IRF6622 AND IRF6678 DIRECTFET MOSFETS
DESCRIPTION
This user guide contains the schematic and bill of
materials for the IRDC3622S evaluation board.
The guide describes operation and use of the
evaluation board itself. The IR3622 IC is a dual
channel synchronous buck controller, providing a
cost-effective, high performance and flexible
solution. The two channels can be configured to
either two independent outputs or current sharing
single output. The current share configuration is
ideal for high current applications.
Key features offered by the IR3622 include
configurable dual output, output voltage tracking,
power up/down sequencing, programmable soft-
start ramp, pre-bias start-up, latched over-voltage
protection, thermal protection, accurate reference
voltage, on-board regulator, threshold sensitive
Enable input, programmable switching frequency up
600kHz and input under-voltage lockout for proper
start-up.
An output over-current protection function and a
hiccup current limit are implemented by sensing the
voltage developed across the on-resistance of the
synchronous rectifier MOSFET for optimum cost
and performance. Detailed application information
for the IR3622 integrated circuit is available in the
IR3622 data sheet.
BOARD FEATURES
? The board is designed for 1.8V output up to 60A load using IR3622 in current share configuration.
? V IN = +12V, (13.2V Max)
? V o = +1.8V ± 3% @ 60A
? V o (ripple)= 50mV maximum
? F s =375kHz
? L=270nH (10x10mm)
? C o =4x220uF (SP) + 10x10uF (ceramic 0805)
? Two 10x10mm inductors combined with 4x220 SP capacitors and 10x10uF ceramic capacitors
form a compact solution.
? The input voltage start threshold of the converter is set about 10V using enable pin and two
external resistors (R22B1 and R22B2).
? The converter has the option to sequence with other supplies using SEQ and Track pins (R6B1,
R22B3 and R22B4). These pins are pulled high as default.
www.irf.com
RD-0622
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