OverLoadTiming .emf

IN

I

D

t

t

I

D(lim)

IN

I

D

t

t

I

D(lim)

OLCR.OVL = 0

OLCR.OVL = 1

SPI Driver for Enhanced Relay Control

SPIDER - TLE7232GS

Block Description and Electrical Characteristics

Data Sheet

18

Rev. 1.0, 2007-12-18

5.2.1

Overload Protection

The SPIDER - TLE7232GS is protected in case of overload or short circuit of the load. The behavior in case of

overload can be configured as follows:

1. The current is limited to

I

down due to overtemperature.

2. The current is limited to

I

overload flag CLn is set.

The overload flag (CLn) of the affected channel is cleared by a low-high transition of the input signal. For timing

information, please refer to Figure 8 for details.

Figure 8

Overload Behavior

5.2.2

Overtemperature Protection

A temperature sensor for each channel causes an overheated channel n to switch off immediately to prevent

destruction. The behavior in case of overtemperature can be configured as follows:

1. After cooling down, the channel is switched on again with thermal hysteresis

2. The affected channel stays switched off until the overtemperature flag is cleared.

The overtemperature flag of the affected channel is cleared by a low-high transition of the input signal.

5.2.3

Reverse Polarity Protection

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

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

V

protected against reverse polarity externally. The overtemperature protection as well as other protective functions

are not active during reverse polarity.