Data Sheet

14

Rev. 1.1, 2012-10-19

TLE8080EM

Power Stages

6

Power Stages

6.1

Low Side Switches

The power stages are built by N-channel power MOSFET transistors. The channels are universal multi channel

switches, but are mostly suitable to be used in engine management systems. Within an engine management

system, the best fit of the channels to the typical loads is:

•

Channel 1 and 3 for injector valves or similar sized solenoids with a maximum operation current requirement

of 2.6A

•

Channel 2 for malfunction indication lamps or other resistive loads with a maximum current requirement of 3A

•

Channel 4 and 5 for relays or other inductive loads with a maximum current requirement of 350mA

The channels are switched off while reset is active (pin NRO is low). After an power on reset the channels will be

switched on with a positive edge at IN1 respectively IN3 or with a switch on command over SPI.

Figure 6

Low Side Switches

In Table 5 the control concept, typical loads, the implemented protection and monitor functions are illustrated.

Table 5

Overview Diagnosis Function

Channel

Control

Recommended

Load

Over

Temperature

Over Current

Open

Load/Short

to GND

1

Pin IN1

Injector Valve

x

1)Reset behavior of the diagnosis bits see Chapter 8.2

x

2

SPI CMD Register

Bit 0

MIL (max. 3W)

x

repetitive switching;

off time

t

oc,off

1)

–

3

Pin IN3

Valve

x

Latch1)

x

4

SPI CMD Register

Bit 1

Relay

one

temperature

sensor for

channel 4 and

channel 5

Latch1)

x

5

SPI CMD Register

Bit 2

Relay

one

temperature

sensor for

channel 4 and

channel 5

Latch1)

x

I

D

OUT

V

DS

GND

L,

R

L

OUT

GND

R

Channel1, 3, 4, 5

Channel2