IRDC3846-P1V2
Confidential
This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results
of the continuing evaluation, this board can evolve and change without notice
AL
4/11/2013
1
USER GUIDE FOR IR3846 EVALUATION BOARD
DESCRIPTION
The
IR3846
is
a
synchronous
buck
converter,
providing
a
compact,
high
performance and flexible solution in a small
5mmx7mm QFN package.
Key features offered by the IR3846 include
internal Digital Soft Start, precision 0.6V
reference voltage, Power Good, thermal
protection,
programmable
switching
frequency, Enable input, input under-voltage
lockout for proper start-up, enhanced line/
load regulation with feed forward, external
frequency
synchronization
with
smooth
clocking, internal LDO, true differential
remote sensing and pre-bias start-up.
A thermally compensated 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 IR3846 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed
application
information for IR3846 is available in the
IR3846 data sheet.
BOARD FEATURES
•
V
in
= +12V (+ 13.2V Max),
No Vcc required.
•
V
out
= +1.2V @ 0-35A
•
F
s
=600kHz
•
L= 0.250uH
•
C
in
= 7x22uF (ceramic 1206) + 1x330uF (electrolytic)
•
C
out
= 6x100uF (ceramic 1206)
Sup
IR
Buck
TM
