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LM1117 / Operation under over load condition

Other Parts Discussed in Thread: LM1117

Hi All,

Our customer evaluate LM1117 under over load condition by using electrical load CR mode. Then they confirmed high peak current over 5A continuously that is not current limited as attached. I'd like to know why the load current is not limited under 1.5A.

LM1117 over load condition.pdf

Best Regards,

Sonoki / Japan Disty

  • Two points ...

    1) Peak voltage does not seem to be in phase with peak current so it appears that the electrical load is not behaving like genuine CR load. Use real 2 ohms resistor.

    2) Iout for LM1117 is measured in wrong location. How much of the measured current is being delivered from the 47uF Cout?