DRV8143-Q1: ITRIP Regulation causes OTP fault

Hi Baris,

Thank you for your questions.

A couple of possibility. 

1) DRV8143-Q1 has current regulation function if it has low side load configuration. Current sense exists on high side FET only. If you load is high side load, ITRIP regulation never happens.

2) Itrip level is determined by external resister and VTRIP selection. For example, if external register is very small, you may not see ITRIP regulation.

3) Your waveform, where are you measuring? if you provide schematic and measurement point and load connection, I can review it.

regards

Shinya 

Thank you for your answer.

The waveform is from an electronic load as a low-side load measured from the DRV8143's output. The ITRIP regulation is happening however the current seems to go well above the ITRIP value which causes the device to go into fault mode due to overheating. Also mind that I achieve this behaviour after I reach the ITRIP current value 7.5A at the output, so the regulation starts as expected.

HI Baris,

Thak you for your update. ITRIP operation is designed for motor/inductive load. Not for resistive load. And electronic load may have some unique behaivior.

I suggest to have motor load or inductor(e.g 10mH).

After motor or inductive load, please review followings calculation formula.

regards

Shinya

Thank you Shinya. It seems like my problem results from the electronic load not being inductive. The peak current decreased when I supplied the output with an inductive load.