Data Sheet V1.0

3

2003-01-10

Circuit Description

The BSP 75N is a monolithic power switch in Smart Power Technology (SPT) with a

logic level input, an open drain DMOS output stage and integrated protection functions.

It is designed for all kind of resistive and inductive loads (relays, solenoid) in automotive

and industrial applications.

Protection Functions

• Over voltage protection: An internal clamp limits the output voltage at

V

60V) when inductive loads are switched off.

• Current limitation: By means of an internal current measurement the drain current is

limited at

I

in the linear region, so power dissipation may exceed the capability of the heatsink.

This operation leads to an increasing junction temperature until the over temperature

threshold is reached.

• Over temperature and short circuit protection: This protection is based on sensing

the chip temperature. The location of the sensor ensures a fast and accurate junction

temperature detection. Over temperature shutdown occurs at minimum 150

°C. A

hysteresis of typ. 10 K enables an automatic restart by cooling.

The device is ESD protected according Human Body Model (4 kV) and load dump

protected (see Maximum Ratings).