TLE 7209-2R

Circuit Description

Data Sheet

7

Rev. 1.4, 2007-04-05

2.2.2

Temperature-depending Current Reduction

Figure 4

Temperature dependent current reduction

2.3

Protection

The TLE 7209-2R is protected against short circuits, overload and invalid supply voltage

by the following measures:

2.3.1

Short circuit to Ground

The high-side switches are protected against a short of the output to ground by an over

current shut-down. If a high-side switch is turned on and the current rises above the short

circuit detection current

of 2

µs, and the error bit “Short Circuit to Ground on output 1 (2)”, SCG1 (SCG2) is stored

in the internal status register.

2.3.2

Due to the chopper current regulation, the low-side switches are already protected

against a short to the supply voltage. To be able to distinguish a short circuit from normal

current limit operation, the current limitation is deactivated for the blanking time

the current has exceeded the current limit threshold

current

Figure 5). All output transistors are turned OFF and the according error bit “Short Circuit

to Battery on output 1 (2)”, SCB1 (SCB2) is set.

A

6.6A

2.5A

Tj

°C

T

SD

tolerance of temperature

dependent current

reduction

rangeof over-

temperature shut-down

I

L

T

ILR