Data brief

For further information contact your local STMicroelectronics sales office.

September 2011

Doc ID 022278 Rev 1

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STEVAL-ISA083V1

4 A peak 800 kHz fixed-frequency PWM synchronous step-down

demonstration board with enable on/off based on the ST1S40IPUR

Features

Description

The STEVAL-ISA083V1, based on the

ST1S40IPUR, is an internally compensated 800

kHz fixed-frequency PWM synchronous step-

down converter demonstration board.

The ST1S40 operates from 4.0 V to 18.0 V input,

while it regulates an output voltage as low as 0.8

The ST1S40 integrates a 95 m

Ω high-side switch

and a 69 m

Ω synchronous rectifier allowing very

high efficiency with very low output voltage.

The peak current mode control with internal

compensation delivers a very compact solution

with a minimum component count.

The ST1S40 is protected through cycle-by-cycle

current limiting in case of overload and is also

protected by a current foldback function with

frequency reduction in case of short-circuit.

The device is available with an enable on/off

function.

STEVAL-ISA083V1

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