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If you have a related question, please click the ' Ask a related question ' button in the top right corner. The newly created question will be automatically linked to this question. Original question:. The failure has not been reproduceable so I do not know if it is on the turn on or turn off. Schematic below. The 2 3-Way valves are not on at the same time. I don't think there's an issue with the device sinking too much current. My thought is that potentially when the output channels turn off, the inductive components cause ringing on the OUTx pins, which could exceed the maximum ratings of the device. Could you also send a zoomed-in waveform of when one of the higher-current channels turn off? The green trace is at pin 16, one of the high current channels. Do you want this further zoomed in to the usec level? Thanks for providing this updated information. I'll look into it and provide a reply tomorrow Dallas time. At the customer's site so I do not have my good scope or current probe. This scope has 20V offset to center line so I need to use a 2V scale to fit over 24V. So far no problem. We have also had a unit in a hot box to see if we could trigger a failure from over temp. So far no failure. Many of the failed units are only running a 4W coil. The attached pictures are with the probe on pin 16 and ground on pin 8. I do not have the current probe with me so this is just the voltage. This is zoomed in on one of the little spikes, I think these are from ground ring of another channel switching at 20KHz. Understood, thanks for the waveforms and updated info. Come to think of it, I have seen cross-channel coupling and ringing in these types of devices that extends both below GND and above the channel voltage. Sorry to ask for another waveform, but could you further zoom into the little spike, at ns level? I suspect that it is greater than the 2V pk-pk that we see here because the scope averages samples at larger timescales. My thought is that the positive side of the ringing is going above the part's maximum, and with repeated instances of this the device can violently break. This is a different unit and the better scope so the offset is 25V. I tuned the trigger for highest peak. I do get the same waveform and peak voltage if I use the scope ground at the chip or if I use the scope ground at a general ground test point that is 1. The 6 layer board has a dedicated ground layer. The 24V is a large copper pour on another layer connecting the 24V source with the 24V outputs. I see no issues on your layout. But if the broken boards work fine after replacing TPLLA, then that rules out shorted valves, and it looks one of your original pictures rules out the kickback overcurrent. Site Search User. Power management Power management forum. Mentions Tags More Cancel. Ask a related question What is a related question? A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question. Ask a new question Ask a new question Cancel. Support feedback. Tags More Cancel. Share More Cancel. Similar topics. This thread has been locked. Prodigy 40 points. The failures are a blow hole, bubbled chip or even exploded chip. Here is plot of the turn on current voltage has a 20V offset : Here is a plot of the turn off current voltage has a 20V offset : Thanks for any ideas. Hi Joseph, I don't think there's an issue with the device sinking too much current. Since the failures are so violent, my thought is that this is EOS due to high voltage. Thanks, Patrick. Up 0 True Down Cancel. The yellow trace is a clamp on current meter on the wire from pin 2 of J7 going to the valve. Hi Joseph, Thanks for providing this updated information. In the meantime, yes, a waveform zoomed in to the usec level would be very helpful. Hi Joseph, Understood, thanks for the waveforms and updated info. Hi Joseph, I see no issues on your layout. Does that give you any ideas? Maybe the 4W coils have nuances that can cause this?

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