SPI Driver for Enhanced Relay Control

SPIDER - TLE7233G

Protection Functions

Datasheet

18

Rev. 1.0, 2008-02-28

7

Protection Functions

Note: The device provides embedded protective functions. Integrated protection functions are designed to prevent

IC destruction under fault conditions described in this datasheet. Fault conditions are considered as

“outside” normal operating range. Protection functions are not designed for continuous repetitive operation.

7.1

Over Load Protection

The TLE7233G is protected against over load or short circuit of the load. After time

t

channel n switches off and therefore the corresponding diagnostics flag Dn is set. The channel can be switched

on after clearing the diagnostics flag. Please refer to Figure 8 for details.

Figure 8

Shut Down at Over Load

7.2

Over Temperature Protection

A temperature sensor for each channel causes an overheated channel n to switch off to prevent destruction. Then

the according diagnostics flag Dn is set. The channel can be switched on after clearing the diagnosis flag. Please

refer to Section 8 for information on diagnostics features.

7.3

Reverse Polarity Protection

In case of reverse polarity, the intrinsic body diode of the power transistor causes increased power dissipation. The reverse

current through the intrinsic body diode of the power transistor has to be limited by the connected load. The

V

supply pins must be externally protected against reverse polarity. The over temperature and over load protection are not active

during reverse polarity.

IN

t

t

OverLoad.emf

IN0 = 01

b

IN0 = 00

b

D0 = 1

b

D0 = 0

b

IN0 = 01

b

D0 = 0

b