TLE7189F

Data Sheet

18

Rev. 2.1, 2007-05-30

Under voltage shut down will not occur when

V

Cxx = 4.7 µF.

5.2.4

Over Voltage Shut Down

The TLE7189F has an integrated over voltage shut down to avoid destruction of the IC at high supply voltages.The

voltage is measured at the Vs and the VDH pin. When one of them or all of them exceed the over voltage shut

down level for more than the specified filter time then the external MOSFETs are switched off. In addition, over

voltage will shut down the charge pumps and will discharge the charge pump capacitors. This results in an under

voltage condition which will be indicated on the ERRx pins. During over voltage shut down the external MOSFETs

and the charge pumps remain off until a reset is performed.

5.2.5

Over Temperature Warning

If the junction temperature is exceeding typ. 155°C an error signal is given as warning. The driver IC will continue

to operate in order not to disturb the application.

The warning is removed automatically when the junction temperature is cooling down.

It is in the responsibility of the user to protect the device against over temperature destruction.

5.2.6

VCC Check

To assure a high level of system safety, the TLE7189F provides an VCC check.

The 5.0V system supply connected to the VS_OA pin is checked by an internally monitoring for over- and under

voltage. An internal filter time is integrated to avoid faulty triggering.

The VCC check is active when the signal on the ENA pin is high and inactive when ENA signal is low (=driver IC

disabled).

In case of under- or over voltage at VS_OA, the VCC check will disable the driver IC and is latched. To restart the

output stages, a reset has to be performed with the ENA pin.

The VCT pin decides about the over voltage and under voltage detection level.

5.2.7

ERR Pins

The TLE7189F has two status pins to provide diagnostic feedback to the µC. The outputs of these pins are 5V

push pull stages, they are either High or Low.

Table 2

Overview of error conditions

Table 3

Behavior at different error conditions

INH

ENA

ERR1

ERR2

Driver conditions

High

High

Low

Low

Under voltage or VCC check error

High

High

Low

High

Over temperature or over voltage

High

High

High

Low

Short circuit detection

High

High

High

High

No errors observed

High

Low

High

High

No errors will be reported

Low

X

Low

Low

ERR output tristate - low secured by pull down

Error condition

restart behavior

Shuts down...

Short circuit detection

Latch, reset must be performed at ENA pin All external Power -MOSFETs

Under voltage

Auto restart

All external Power -MOSFETs

Over voltage

Latch, reset must be performed at ENA pin All external Power -MOSFETs