IRDC3138EVAL Datasheet, PDF (1/6 Pages) International Rectifier – EVALUATION BOARD USER GUIDE

IRDC3138EVAL
IRU3138 EVALUATION BOARD USER GUIDE
DESCRIPTION
The IRU3138 controller IC is designed to provide a low
cost synchronous Buck regulator for voltage tracking
applications such DDR memory and general purpose
on-board DC to DC converter. Modern micro processors
combined with DDR memory, need high-speed bandwidth
data bus which requires a particular bus termination volt-
age. This voltage will be tightly regulated to track the
half of chipset voltage for best performance. The IRU3138
together with two N-channel MOSFETs, provide a low
cost solution for such applications. This device features
a programmable frequency set from 200KHz to 400KHz,
under-voltage lockout for both Vcc and Vc supplies, an
external programmable soft-start function as well as
output under-voltage detection that latches off the de-
vice when an output short is detected.
SPECIFICATION DATA
Switcher:
Vc = 12V
Vcc =VIN =5V
VOUT = 1.6V
IOUT = 12A
DVOUT = 50mV
FS = 400KHz
INPUT/OUTPUT CONNECTIONS
The following is the input/output connections:
Inputs:
JP1: Input (+5V) and GND
JU1: Vcc/Vc
Outputs:
JP2: VOUT (+1.6V)
JP3: Gnd
Other Connections:
J1: Scope connection for Vout
The connection points is shown in Figure 1. Connect the
power supply cables according to this figure, minimize
wire lengths to reduce losses in the wire. Test point J1
provides easy connections for oscilloscope voltage probe
to monitor the output voltage.
Rev. 1.3
03/29/04
www.irf.com
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