TLE7184F

Description of Modes, Protection and Diagnostic Functions

Data Sheet

24

Rev. 1.0, 2008-12-04

The VDHS switch is deactivated.

The IC will not react to IFMA or INH signals. Even a Over Temperature Shut Down detection will have no influence.

The internal logic is supplied and prevents the IC from going into “Go to sleep mode”.

The only way to leave this state is that VS is lower than

V

case the IC goes to Sleep Mode.

VREG Shut Down Mode

This mode is intended to prevent the IC for long time toggling in Over Temperature if a short is present at the VREG

pin.

There are 2 ways to enter this mode:

1. The IC is in the Error Mode and a VREG Under Voltage Shut-down occurs without a Over Temperature

Prewarning.

2. The IC is in the Normal Mode and a VREG Under Voltage Shut-down occurs without a Over Temperature

Prewarning.

In this mode VREG is switched off, but VDD is still present. VDHS switch is still active. The PWM interface (IFMA)

is working.

The IC will not react to IFMA or INH signals.

In this situation the µC is still able to provide diagnostic information by the interface. It can prevent the IC from Go-

to-Sleep Mode and to avoid unintended toggling as long there is no Over Temperature Shut Down.

This state can be left by 2 ways:

1. The µC has to set RGS to low for a time longer than

t

2. If a VDD Under Voltage Shut Down or a Over Temperature Prewarning occurs the IC will go into the Deadlock

Mode.

9.2

Protection and Diagnosis Functions

9.2.1

Over Temperature Shut Down (OTSD)

If the junction temperature is exceeding the Over Temperature shut down level an error signal is set. The driver

IC will pull- down the gate-source voltage of all external MOSFETs, deactivate the VDD and VREG supply and go

directly into the Sleep Mode.

In the Sleep Mode the regular wake-up conditions will be used. Over Temperature cycling is possible and will lead

to accelerated aging of the IC.

In Deadlock Mode an Over Temperature Shut Down is ignored.

9.2.2

Over Temperature Prewarning (OTPW)

The IC provides a digital Over Temperature Pre-Warning. If no other errors are present, the IC goes into “Normal

Mode with Over Temperature Prewarning”. This function is not available in Deadlock Mode.

9.2.3

Analog Temperature Monitoring

The TEMP output of the TLE7184F provides an analog voltage signal proportional to the chip temperature. This

function is not available in Deadlock Mode.

9.2.4

VS Under Voltage Lockout (VS_UVLO)

The TLE7184F has an integrated VS Under Voltage Lockout, to assure that the behavior of the complete IC is

predictable in all supply voltage ranges.