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LMZ14203HEVAL: Minimum load and burn out issue

Part Number: LMZ14203HEVAL

Hi, 

With this eval module I was able to have it running perfectly with resistor loads and powered off a power supply. I then plugged it into a 32V battery to power a single board computer. I did not have the enable pin connected to power when the battery was switched on. I heard a popping sound and then the module no longer worked (Vout was shorted to ground). 

I am wondering if any one knows what could have been the cause so that I don't break another one. I'm also wondering what the minimum load current is and if this will be able to power the computer when its in low power or sleep mode. 

Thanks 

  • Hi Michaela,

    You mentioned the part has VOUT short to ground. Can you also confirm the resistance between VIN and ground? What was your load resistor / How much current were you pulling?

    This part is a rated for 42V maximum input at 3A continuous load current. When you hotplug a 32V battery into the input, there may be voltage spikes that exceed the maximum input voltage spec which may cause EOS damage internal to the device. As a result, I would generally recommend having an electrolytic (100uF+) capacitor with high ESR to help dampen the input voltage during startup.

    Regards,

    Jimmy