Hi,
Issue: TPS54231 fail after powering up from 24V
We are using TPS54231DR in our design as step down converter with the following specifications,



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Hi,
Issue: TPS54231 fail after powering up from 24V
We are using TPS54231DR in our design as step down converter with the following specifications,
Hi, AS
Some comments:
1. After IC is damaged, which pin is damaged?
2. What is failure rate? Does every board have issue?
3. I reviewed the schematic and layout, but I don't think the 2 reasons you mentioned will cause IC damaged.
4. Could you measure some waveforms on the good board? Including Vout, PH, and inductor current.
Test conditions includes power on/off and steady state.
BTW, What is tolerance of Vin?
Hi Zhao,
- Load Regulation : ≤0.001% +3mV
I can submit the wave forms once I reached Lab.
Thanks.
Hi Zhao,
There is no visual effects on the IC. Initially its powered on and worked fine. After some off and on cycle, it damaged. We regulated the input current at 200,mA. Is there any possibility of a spike voltage?
The IC maximum voltage is 28V.
Hi Zhao,
Actually the board is powered with a regulated SMPS DC power supply with current limited. Its voltage is stable.
The inductor value is 15uH , tolerance is 20%, and DCR is 60m.
With the IC damaged state , can we say possibility of short circuit in the output circuitry of the IC?
Hi, AS
1. After IC is damaged, please measure the impedance between Vout and GND.
And unmount the TPS54231, measure again, then we can judge the short circuit happen at TPS54231 or at downstream circuit.
2. Could you measure some waveforms on the good board? Including Vout, PH, and inductor current.
Test conditions includes power on/off and steady state.