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LM5013: VIN and EN pins burned out

Colin Chen
Intellectual 825 points
Part Number: LM5013

Tool/software:

Dear Experts,

The circuit diagram is as follows.When powered on with a 48V lithium battery, the chip works normally; When using a 56V lithium battery for power on, the VIN and EN pins were burned out. Upon checking the waveform of the power on, the peak input voltage reached 116V. If one or two 4.7uF ceramic capacitors were connected in series with the VIN pin, it would still burn out. It is currently unclear what the cause is.Hope to receive an answer. The lithium battery is connected to the chip VIN through an air switch

  • 0
    TI__Expert 5490 points

    Hi Chen,

    It is recommended to use the electrolytic capacitor at the input parallel to the input pin and GND. 

    When the input DC source is hot plugged to the device with long cables, due to long cable inductance / PCB trace inductance and ceramic capacitor the LC oscillation will happen and which causes the voltage to cross abs. max rating of the device. To mitigate this issue, place electrolytic capacitor. The equivalent series resistance (ESR) of the electrolytic capacitor dampens the oscillations caused by long cables and input capacitors.

    Try placing 22uF or 10uF /100V electrolytic capacitor at the input side and check is the issue is resolved. 

    Thanks,

    Nitya