Semiconductor Group

3

1998-02-01

TLE 5204

Circuit Description

Input Circuit

The control inputs consist of TTL/CMOS-compatible Schmitt triggers with hysteresis.

Buffer amplifiers are driven by these stages and convert the logic signal into the

necessary form for driving the power output stages.

Output Stages

The output stages form a switched H-bridge. Protective circuits make the outputs short-

circuit proof to ground and to the supply voltage throughout the operating range. Positive

and negative voltage spikes, which occur when switching inductive loads, are clamped

by integrated power diodes.

Functional Truth Table

E1

E2

Q1

Q2

Comments

L

LLLMotor brake; both low side transistors turned-ON

L

H

L

H

Motor turns clockwise

H

L

H

L

Motor turns counterclockwise

H

HHHMotor brake; both high side transistors turned-ON

Notes for Output Stage

Symbol

Value

L

Low side transistor is turned-ON

High side transistor is turned-OFF

H

High side transistor is turned-ON

Low side transistor is turned-OFF