LM5012: LM5012DDAR IC getting failed above 80V input supply while testing 500mA load

Ranjesh Kumar

Part Number: LM5012

Tool/software:

Hello,

I am designing a power supply with a 12V, 2.5A output requirement. The input voltage can go up to 90V, so I selected the LM5012DDAR buck regulator for this purpose.

According to the datasheet, the LM5012 supports input voltages up to 100V for normal operation. However, during testing, the IC consistently fails when the input exceeds 80V.

Could you help me identify the possible reasons for this failure and suggest any solutions?

I have attached the schematic below for your reference:

11 months ago

0 Nityanand Hegde 11 months ago

TI__Expert 5520 points

Hi Ranjesh,

It could be due to input transient voltage is crossing the abs.max rating of the device. If you have long wiring harness during hot plug or startup condition, the wire inductance plus input cap starts resonate and crosses the abs.max rating of the device. Recommended to keep 22uF/33uF electrolytic capacitor in parallel with input cap[C1] and repeat the test.

Thanks,

Nitya

0 Nityanand Hegde 10 months ago in reply to Nityanand Hegde

TI__Expert 5520 points

Hi Ranjesh,

I hope the issue is resolved. I am closing this thread.

Thanks,

Nitya

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LM5012: LM5012DDAR IC getting failed above 80V input supply while testing 500mA load