Data Sheet TLE6282G

2

Rev 2.2 2006-03-07

Application Block Diagram – Injector / Valve Drive

SH1

TLE

4278G

V

C

S

47µF

C

D

47nF

D

I

Q

Reset

W atchdog

C

Q

22µF

µC

GH1

R

Q

47 k

Ω

DH1

BH1

SH2

GH2

DH2

BH2

GL1

DL1

GND

GL2

DL2

VS

WD

R

V

CC

ER1

DT/

DIS

R

Q

47 k

Ω

IH1

IL1

IH2

IL2

Load 2

Load 1

C

B

220nF

C

B

220nF

C

S

1µF

R

10

Ω

This application diagram shows the principle schematics of a typical injector / valve drive. Other

configurations are possible as well. Freewheeling diodes are not considered. The 10 mΩ resistor

is not needed by the Driver IC, but may be needed for load current measurement. The voltage

devider networks, e.g. R = 10 kΩ, across the two Low Side MOSFETs are an example as well;

they allow to increas the current limit threshold for Short Circuit protection SCD for the Low Side

MOSFETs. As they pull down the Sources of the High Side MOSFETs (while the Low Side MOS-

gets enabled). The SCD current limit threshold can be increased for the High Side MOSFETs as

well by using voltage devider networks across the High Side MOSFETs. SCD can also be dis-

abled (High Side and / or Low Side MOSFETs).