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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 431

ISOLATED TRIPLE OUTPUT TELECOM CONVERTER

1

LT1725, LTC1773, LTC4210

DESCRIPTION

Demonstration circuit 431 is a simple isolated

telecom converter, built in the footprint of a stan-

dard “half-brick”. The input voltage range is 36-

72V and three outputs are provided, 5V 3.3V and

2.5V. Total available power is 30W.

Design files

for this circuit board are available. Call the LTC

factory.

Table 1. Performance Summary

PARAMETER CONDITION VALUE

Input Voltage 36-72V

VOUT1 VIN 36-72V, Iout1 = >50mA – 1A 5V +-3%

VOUT2 VIN 36-72V, Iout2 = 0-5A 3.3V +-3%

VOUT3 VIN 36-72V, Iout3 = 0-4A 2.5V +-3%

Isolation 1 min 1500V

Efficiency V

IN

=48V, Iout1 = 1A, Iout2 = 5A, Iout3 =

4A

73% typ.

OPERATING PRINCIPLES

Demo DC431 is a simple isolated triple output

converter that might be used in a small telecom

system. Input power, nominally 48V, is converted

to isolated 5V by an LT1725 based flyback con-

verter. This isolated 5V rail serves as the input for

two LTC1773 based synchronous buck converters

that separately derive the two low voltage rails

from the isolated 5V rail. The benefit of this archi-

tecture is its flexibility, since the low voltage rails

are derived from separate converters their outputs

can be modified to suit the application without

modifying the main power transformer.

QUICK START PROCEDURE

Demonstration circuit 431 is easy to set up. Refer

to Figure 1 for proper measurement equipment

setup and follow the procedure below:

1.

With the power off, connect the input power

supply, meters and loads as shown in Figure 1.

2.

The demo is now set up for evaluation. Turn on

the input power and adjust the output loads.

3.

The board can be shutdown by connecting the

shutdown pin to the VIN- input.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 431

ISOLATED TRIPLE OUTPUT TELECOM CONVERTER

2

Figure 1. Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 431

ISOLATED TRIPLE OUTPUT TELECOM CONVERTER

3