ISO5452: ISO5452 short circuit protection

Hi Sammi,

What is their PWM frequency and duty  for this test?

What is the load?

And I can't tell exactly  about the timing but it looks like around 800ns at the top of Fig 1 DESAT voltage. If this is confirmed, then this is exceeding the desat deglitch filter, if the voltage #2 is above the threshold?. Could you ask them about this timing? ANd also the plateau voltage (#2).

Best

Dimitri

Hi Dimitri,

Thanks for your response.

Please refer to this picture customer tested:

1: single pulse test 7us, high-side MOSFET always ON, low-side MOSFET was driver to simulate short circuit;

2: Add a 9.1V Zener diode, so the voltage was limited at 9.1V;

3: The cursor a is the short circuit thresholds 8.1V(Vdesat-2*diode);

4: Customer think CH1 should decline in cursor b position several us, then drop to VEE.

CH1: fault signal; CH2: PWM; CH3:DESAT; CH4: OUTPUT signal

Thanks.

Best regards,

Sammi