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PTN78020W: Output Protection for Overvoltage and/or Short Circuit

Part Number: PTN78020W
Other Parts Discussed in Thread: PTN78020A, , TPSM53604

I'm using a PTN78020W and PTN78020A to design a positive and negative variable output power supply.  My question is do these need overvoltage and/or short circuit protection on the output leads?  If so, do you have any suggestions?

Thanks,

Mike Pitman

  • Hi Mike,

    Generally these "plug in play" power modules do not need any additional components outside of what is recommended in the datasheet.

    If you want to have some level of overvoltage protection, perhaps you can use a TVS diode to limit the voltage above your desired output voltage setting.

    Regards,

    Jimmy 

  • Thanks, Jimmy.

    My main concern was if a user shorts the output connections but it sounds like that shouldn't be a concern.

    Mike

  • Hi Mike,

    Just to be clear, the device itself doesn't have short circuit protection. Note that these are older parts around 2005.

    As it is, the device has an overcurrent limit and overtemperature shutdown protection.

    For cases where you foresee the output leads being shorted together, perhaps you might want to use an output fuse and/or output supervisor circuit.

    Otherwise depending on your power conditions, you might want to take one of the new converters/ power modules and convert it from buck topology into IBB topology.

    Here is an example of using the TPSM53604 as an IBB (positive input/negative output).

    Regards,

    Jimmy