H-Bridge and Dual Half Bridge Driver IC

TLE7181EM

Description and Electrical Characteristics

Data Sheet

10

Rev 1.1, 2010-09-30

5

Description and Electrical Characteristics

5.1

MOSFET Driver

5.1.1

Driving MOSFET Output Stages

The TLE7181EM incorporates 2 high side and low side output stages for 4 external MOSFETs.

The 4 MOSFET output stages will be driven by the PWM/DIR interface. With the PWM/DIR interface only 2 inputs

pins are necessary to drive a typical H-bridge topology for a DC-brush motor. The rotation direction of the motor

can be chosen with the input pin DIR. The speed of the motor can is controlled by applying a PWM-signal at pin

PWM.

The DRVDIS pin allows to switch off all 4 MOSFETs. Table 3 provides an overview of the different states with this

interface.

Table 3

PWM/DIR interface normal operation

5.1.2

MOSFET Output Stages

The six push-pull MOSFET driver stages of the TLE7181EM are realized as separate floating blocks. This means

that the output stage is follows the individual MOSFET source voltages and so ensuring stable MOSFET driving

even in harsh electrical environment.

All 4 output stages have the same output power and thanks to the used bootstrap principle they can be switched

all up to high frequencies.

Each output stage has its own short circuit detection block. For more details about short circuit detection see

Chapter 5.2.2.

DRVDIS DIR

PWM

Highside switch1 Lowside switch1 Highside switch2 Lowside switch2

00

0

ON

OFF

ON

OFF

00

1

ON

OFF

OFF

ON

01

0

ON

OFF

ON

OFF

0

1

1

OFF

ON

ON

OFF

1

x

x

OFF

OFF

OFF

OFF