Supertex inc.

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

FP0100

Features

Applications

General Description

The Supertex FP0100 is a high voltage fault protection switch

with current fold-back. It is designed to protect system output

power supplies against over-current or short circuit conditions.

In protection mode, the FP0100 limits the current to 300µA.

The FP0100 can be considered as a normally closed switch

with a typical switch resistance of 4.0Ω. The peak current

allowed to pass through the switch can be set by an external

resistor across VOUT and RSEN. Once the voltage drop

across VIN and VOUT exceeds a nominal value of 3.0V,

the input current will fold-back to 300µA. In the off state, the

FP0100 can withstand up to 100V. Higher input voltages

can be accommodated by using an external depletion-mode

MOSFET. Please refer to Figure 4 for more details. The

FP0100 is available in a SOT-89 package.

Fault Protection Switch

with Current Fold-back

Typical Application Circuit

FP0100

LOAD

+

V

IN

-

VIN

VOUT

RSEN

R

SEN