IRDC3637EVAL Datasheet, PDF (1/8 Pages) International Rectifier – IR3637 EVALUATION BOARD USER GUIDE

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.
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
INPUT / OUTPUT CONNECTIONS
The connection points are shown in
The following is the input / output connections: ^{Figure1. Connect the power supply}
Inputs:
cables according to this figure,
JP1: Input (+5V) and GND
minimizing wire lengths to reduce
JU1: V_c
Outputs:
losses in the wire. Test points J1 and
J2 provide easy connection for
JP2: V_out (+1.8V) and GND
Other Connections:
oscilloscope voltage probe to monitor
the inductor points and output voltage.
J1: Scope connection for V_out
J2: Scope connection for Inductor Point
PACKAGE INFORMATION
Fb 1
Vcc 2
LDrv 3
Gnd 4
8 SS/SD
7 Comp
6 Vc
5 HDrv
Rev1.0
1
4/29/2005