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IRDC3637EVAL Datasheet

  • IRDC3637EVAL

  • IR3637 EVALUATION BOARD USER GUIDE

  • 8頁

  • IRF

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IRDC3637EVAL
IR3637 EVALUATION BOARD USER GUIDE
DESCRIPTION
The IR3637 controller IC is designed to
provide a low cost synchronous Buck
regulator for on-board DC to DC
applications in a small 8-pin SOIC. The
output voltage can be precisely regulated
using the internal 0.8V reference voltage
for low voltage applications.
The IR3637 operates at a fixed internal
400KHz switching frequency to reduce the
component size.
The device features under-voltage lockout
for both input supplies, an external
programmable soft-start function as well as
output under-voltage detection that latches
off the device when an output short is
detected.
INPUT / OUTPUT CONNECTIONS
The reference board is designed for
1.8V output using +5V and +12V
supplies. This will demonstrate the
main features of IC.
This user guide contains the schematic
and bill of materials, the design
guidelines are described in data sheet.
SPECIFICATION DATA
V
c
= 12V
V
cc
=V
in
=5V
V
out
=1.8V
Iout =7A
Output Ripple = 50mV
F
s
= 400KHz
The connection points are shown in
Figure1. Connect the power supply
The following is the input / output connections:
cables according to this figure,
Inputs:
minimizing wire lengths to reduce
JP1: Input (+5V) and GND
losses in the wire. Test points J1 and
JU1: V
c
J2 provide easy connection for
Outputs:
oscilloscope voltage probe to monitor
JP2: V
out
(+1.8V) and GND
the inductor points and output voltage.
Other Connections:
J1: Scope connection for V
out
J2: Scope connection for Inductor Point
PACKAGE INFORMATION
Fb
1
Vcc
2
LDrv
3
Gnd
4
Rev1.0
4/29/2005
8
SS/SD
7
Comp
6
Vc
5
HDrv
1

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