TLE 4226 G

Data Sheet

4

2002-10-21

Application Description

Applications in automotive electronics call for intelligent power switches that can be activated by

logic signals, which have to be shorted load protected and which provide error feedback.

This IC contains six power switches connected to ground (low-side switches). On inductive loads

the integrated Z-diodes clamp the discharging voltage.

By means of TTL signals on the control inputs (active high) all six switches can be activated

independently of one another when a high level appears on the preferred-state input. When there

is a low level on the preferred-state input, switches 1 to 4 are switched on, switches 5 and 6 are

switched off regardless of the control-input levels. The inputs are highly resistive and therefore must

not be left unconnected but should always be on fixed potential (noise immunity). Inputs that are not

used, should be connected to low level to reduce the power consumption.

The analog status output signals the following errors by analog voltage levels:

– Overload

– Thermal overload

– Openload or shorted load to ground (only switches 5 and 6)

The following levels signal errors at the analog and digital status outputs.

Possible Input and Output Levels

Errors

Analog Status

Digital Status

Normal function

Low

High

Overload

Openload or shorted load to ground (only switches 5 and 6)

Thermal overload

1.0 V to 3.3 V

1.0 V to 1.7 V

> 3.5 V

Low

Low

Low

Supply Voltage

V

S

PREFST

IN1-6

Q1-Q4

Q5, Q6

2 to 5 V

5 V

5 V

Low

High

High

Random

Low

High

Low

High

Low

High

High

Low