Data Sheet TLE 6232 GP

V1.2

Page

08.Oct. 2003

7

Description of the Power Stages

4 low side power switches for nominal currents up to 3A (power stages OUT1 to OUT4). Con-

switches is below 500m

Ω.

2 low side power switches for nominal currents up to 1.5A (power stages OUT5 and OUT6).

switches is below 1

Ω.

In order to increase the switching current or to reduce the power dissipation parallel connec-

tion of power stages is possible.

Each of the 6 output stages is equipped with its own zener clamp, which limits the output volt-

age to a maximum of 60V. The outputs are provided with a current limitation set to a minimum

of 1.5A resp. 3A. Each power stage is equipped with an own temperature sensor.

Each output is protected by embedded protection functions

(early warning). If this operation leads to an over-temperature condition, a second protection

level (about 170°C) will change the output into a low duty cycle PWM (selective thermal shut-

down with restart) to prevent critical chip temperatures.

The following faults can be detected (individually for each output):

- short to UBatt:

(SCB/overload) can be detected when switches are

On state

- short to ground:

(SCG) can be detected when switches are

Off state

- open load:

(OL) can be detected when switches are

Off state

- over-temperature: (OT) will only be detected when switches are

On state

The fault conditions SCB, SCG and OL will not be stored until an integrated filtering time is

expired (please note for PWM application). If, at one output, several errors occur in a se-

quence, always the last detected error will be stored (with filtering time). All fault conditions are

encoded in two bits per switch and are stored in the corresponding SPI registers. Additionally

there are two central diagnostic bits: one especially for over-temperature (latched result of an

OR-operation out of the 6 signals of the temperature sensor) and one for fault occurrence at

any output. A fault that has been detected and stored in the fault register must not be replaced

by o.k.-state (11) unless it is read out by the RD_DIAG command sent by the microcontroller

or an internal or external reset has been applied. I.e. the fault register will be cleared only by

the RD_DIAG command.

PRG - Program pin.

PRG = Low (GND): Parallel inputs Channel 1 to 6 are low active.

If the parallel input pins are not connected (independent of high or low activity), channels 1 to

6 are switched OFF.

PRG pin itself is internally pulled down when it is not connected.

normal operation or permanently.