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TPSI3052: Continuous load on the isolated side

Bela Istvanfi
Prodigy 30 points
Part Number: TPSI3052

Tool/software:

Ladies and Gentlemen,

I'm using TPSI3052 to control back-to-back MOSFETs as an AC switch. Works perfect, I'm satisfied with. However, there's another requirement: protect the switch from overcurrent.

Since I don't find an ideal PTC, I'm thinking of using hall-based current sensors. These need their own power supply.

Is it possible, to load the isolated side (VddH or VddM) with a continuous 10 mA current? I cannot find such a spec in the datasheet. In TIDUC65 there's a comparator, it needs 4.5mA on the isolated side, but a simple comparator is not good enough for my application. How shall I modify the circuit, to be able to supply such a DC current? Rpxfr=16k at the moment, I use 3 wire mode.

Thank You in advance for Your assistance.

  • +1
    TI__Intellectual 940 points

    Hello Bela Istvanfi,

    You will be happy to here we just released the TPSI3100, which works the same as the TPSI3052, but has integrated dual isolated comparators. In the application section of the datasheet, you can find 4 different circuits for overcurrent protection. 

    To answer you question, changing to Rpxfr = 20k, the TPSI3052 can provide up to 13.7mA @ 25C continuously on the VDDM. See table 9-2 in the datasheet. 

    Please feel free to reach out to me with any further questions.

    Regards,

    Jack Hemmersmeier