Preliminary Datasheet TLE 6217

V5

Page 9 of 20

30. 07. 2002

Open load is detected for all four channels in on and off mode.

In the on mode the load current is monitored. If it drops below the specified threshold value IQU then an

open load condition is detected.

In the off mode, the output voltage is monitored. An open load condition is detected when the output

prevent an open load diagnosis in case of transient Voltages on the outputs the open load detection in

off mode uses a filter of typ. 30µs.

Status output at pulse width operation

If the input is operated with a pulsed signal, the status does not follow each single pulse of the input sig-

µs) enables a continuous status output signal. See the

timing diagrams on the following pages for further information.

This internal status delay simplifies diagnostic software for pwm applications.

Diagnostic Table

In general the status follows the input signal in normal operating conditions.

If any error is detected the status is inverted.

Operating Condition

Standby

Input

Enable

Input

Control

Input

Power

Output

Status

Output

STBY

ENA

IN

Q

ST

Standby

L

X

X

off

H

Normal function

H

H

H

L

H

H

X

L

H

off

off

ON

L

L

H

Open load or short to ground

H

H

H

H

L

L

H

H

L

H

L

H

off

off

off

ON

H

H

H

L

Overload or short to supply

1)

reset latch

2)

H

H

H

H

H

L

H

H

→ L

X

off

off

off

L

L

L

Overtemperature

1)

reset latch

2)

H

H

H

H

H

L

H

H

→ L

X

off

off

off

L

L

L

will not be latched and not reported at the status pin.