We use the INA220 in a fairly basic circuit (8 pcs on one board), and we had quite a few latch-ups.
Is this circuit extra sensitive for latch-up and which pins are mostly the cause?
What is the best remedy to avoid it?
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We use the INA220 in a fairly basic circuit (8 pcs on one board), and we had quite a few latch-ups.
Is this circuit extra sensitive for latch-up and which pins are mostly the cause?
What is the best remedy to avoid it?
Hi Peter,
INA220 passed standard latch up test JESD78, and I’m not aware of similar complaints. Can you be more specific on how you came to the conclusion that it is latch up, and not some other issues, that is causing the problem? What are the visual/electrical indications? Does the device get damaged randomly on the the PCB or is there any pattern? Have the supply/signal/ground levels been looked at for worst case?
Regards,
Guang-Apps CS Products
Having the bus voltage rise before the power supply should be just fine.
Are you running a PWM or other kind of fast-rising-edge waveform into the device?
Have you tried removing R7 or R8 (not simultaneously) to see if either of them is responsible for the odd behavior and the behavior goes away if they aren't present? This is a very strange thing to be happening for such a simple circuit subdiagram. Let us know and we'll keep trying to debug this!