International Rectifier IRU3046 User Manual

IRU3046 EVALUATION BOARD USER GUIDE

INTRODUCTION

The IRU3046 IC combines a dual synchronous PWM
controller and a linear regulator controller, providing a
cost-effective, high performance and flexible solution for
multi-output applications. The dual synchronous control-
ler can be configured as 2-independent or 2-phase con-
troller. In 2-phase configuration, the IRU3046 provides
programmable current sharing which is ideal when the
output power exceeds any single input power budget.
IRU3046 provides a separate adjustable output by driv-
ing a switch as a liner regulator. The Eval Board is de-
signed for current sharing mode (see the IRU3046 data
sheet for detail description), the two PWM controllers
provide one single output and the linear regulator pro-
vides the second output.

INPUT/OUTPUT CONNECTIONS

The following is the input/output connections:
Inputs:
JP1: +5V and Gnd.
JP2: +12V and Gnd.
JP5: LDOIN (3.3V) and Gnd.
Alternative connections:
JP3: ATX Connector for 3.3V, 5V and 12V inputs and
Gnd.
Outputs:
JP4: +VOUT (1.5V) and Gnd.
JP6: +LDOOUT (2.5V) and Gnd.
Rev. 1.0
05/22/02
SPECIFICATION DATA
Switcher:
V = 5V
IN1(MASTER)
V = 12V
IN2 (SLAVE)
V = 1.5V
OUT
I = 16A
OUT
DV
= 75mV
OUT
FS = 200KHz
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,
J2 and J3 provide easy connection for oscilloscope volt-
age probe to monitor the inductor points for each PWM
section and output voltage.
www.irf.com
IRDC3046
Linear Regulator:
LDO = 3.3V
IN
LDO = 2.5V
OUT
I = 2A
OUT
1