IRDC3039EVAL Datasheet, PDF (1/8 Pages) International Rectifier – IRU3039 EVALUATION BOARD USER GUIDE

IRDC3039EVAL
IRU3039 EVALUATION BOARD USER GUIDE
INTRODUCTION
The IRU3039 controller IC is designed to provide a syn-
chronous Buck regulator and is targeted for applications
where the cost and size is critical. The IRU3039 oper-
ates with a single input supply up to 20V. The output
voltage can be programmed as low as 0.8V for low volt-
age applications. Selectable current limit is provided to
tailor to external MOSFET’s on-resistance for optimum
cost and performance. The IRU3039 features an uncom-
mitted error amplifier for tracking output voltage and is
capable of sourcing or sinking current for applications
such as DDR bus termination.
SPECIFICATION DATA
Switcher:
VIN = 18V
VOUT = 3.3V
IOUT = 8A
DVOUT = 100mV
FS = 200KHz
This device features a programmable switching 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 detec-
tion that latches off the device when an output short is
detected.
INPUT/OUTPUT CONNECTIONS
The following is the input/output connections:
Inputs:
JP1: Input (+18V), Gnd
Outputs:
JP2: VOUT (+3.3V), Gnd
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 the oscilloscope voltage
probe to monitor the output voltage.
Rev. 1.0
05/30/03
www.irf.com
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