TLE7209-2R datasheet(7/32 Pages) INFINEON

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TLE 7209-2R

Circuit Description

Preliminary Datasheet

V1.0, 2004-mar-12

2.2.2

Temperature-depending Current Reduction

For 165

°C< T

j <175 °C

the current limit decreases from

IL =6.6 A ± 1.1 A to

IL =2.5 A ± 1.1 A as shown in Figure 4

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

IOUK all output transistors are turned off after a typical filter time

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

Short circuit to VS

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

tb after

the current has exceeded the current limit threshold

IL. If the short circuit detection

current

IOUK is reached within this blanking time, a short circuit is detected (see

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.

6.6A

2.5A

°C

165°C

175°C

tolerance of

temperature dependent

current reduction

range of over-

temperature shut-

down

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