Data Sheet

21

V1.3, 2008-12-23

TLE6270R

Quad Low Side Injector Driver

Functional Description

5.5

Protections

5.5.1

All Inputs/Outputs

All pins are protected against ESD 2kV Human body model.

5.5.2

T1, T4 Power Transistors

•

Protection against damaging failures

Note: The protection latches are reset when the NON input is at high level.

•

Protection against overvoltage

A clamping circuit limits the output voltage to a defined value (

V

transistor when the solenoid load is switched off.

•

Protection against turn on due to fast voltage ramp on output.

A very fast voltage slope on the output can turn on the power transistor (capacitive effects) especially when

the normal gate pull-down structure is not active (IC not supplied,

V

is turned off immediately. This function is guaranteed for

V

5.6

Reset

There are two different reset functions:

•

Undervoltage reset

•

NRES reset pin

If one or several of the following conditions are present:

•

V

•

NRES pin at low level,

the low side T1, T4 are switched off, NCTL2 and NCTL3 set to high level, all diagnostic registers are reset and the

SDO is tri-stated.

Table 5

Protection against Damaging Failures

Problem detected

Transistors switched off

T1 or T4 overcurrent

T1, T4 (internally) and T2, T3 (via NCTL2, NCTL3)

T1 or T4 overtemperature

T1, T4 (internally) and T2, T3 (via NCTL2, NCTL3)

HS_Diag L

→ H

T1, T4 (internally) and T2, T3 (via NCTL2, NCTL3)

T1 or T4 peak current undertime

T1, T4 (internally) and T2, T3 (via NCTL2, NCTL3)

T1 or T4 peak current overtime

T1, T4 (internally) and T2, T3 (via NCTL2, NCTL3) and

t