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L9348

1.7

Diagnostic Output at Pulse Width Operation (PWM)

If an input is operated with a pulsed signal (f

tD = 667 Hz typ.), the status does not follow each single pulse.

An internal delay tD of typ. 1.5ms leads to a continuous status output signal (see Figure 4 in chapter 2.0 Timing

Diagrams).

1.8

Diagnostic Table

In general the diagnostic follows the input signal in normal operating conditions. If any error is detected the di-

agnostic is inverted.

Open load

(under current detection)

X

18

s

internal timer (1.5ms typ.)

Overtemperature

X

18

s

ENA or INx = “LOW”

for t

1.5ms (typ.)

Power-GND-loss

X

X

18

s

ENA or INx = “LOW”

for t

1.5ms (typ.)

Signal-GND-loss

X

X

18

s

ENA or INx = “LOW”

for t

1.5ms (typ.)

Output voltage clamp active

(Q3/4 only)

X

-

internal timer (1.5ms typ.)

Table 7.

Operating Condition

Enable

Input

ENA

Control

Input

IN

Power

Output

Q

Status

Output

ST

Normal function

L

L

H

H

L

H/PWM

L

H/PWM

OFF

OFF

OFF

ON

L

L

L

H

Open load or short to ground

L

L

H

H

L

H/PWM

L

H/PWM

OFF

OFF

OFF

ON

X

X

H

L

Overload or short to supply

Latched overload

Reset latch

H

H

H –> L

H

H/PWM

H/PWM

X

H/PWM –> L

OFF

OFF

OFF

OFF

L

L

L

L

Overtemperature

Latched overtemperature

Reset latch

H

H

H –> L

H

H/PWM

H/PWM

X

H/PWM –> L

OFF

OFF

OFF

OFF

L

L

L

L

Table 6.

ON State

ENA = HIGH,

IN = HIGH

OFF State

ENA = HIGH,

IN = LOW

typ. Filter

time

Reset done by