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TPSI3050: Usable as gate driver for DC/BLDC motor half-bridges? Usable as just isolated 10V power supply?

Florian Sonnenberger
Prodigy 40 points
Part Number: TPSI3050
Other Parts Discussed in Thread: TPSI3052

Tool/software:

The data sheet, design guides, application notes etc. for the TPSI3050/TPSI3052/... make it quite clear that this part (family) is intended for building solid state relays or other load switches that require isolation. The part is however quite capable of higher switching frequencies, depending on the gate charge and power transfer setting.

I'm wondering if it can be used as gate driver for BLDC half-bridges (Si-MOSFET) for 230V AC applications, where isolated gate drivers are required. The integrated isolated drive power supply is a very nice bonus feature that would reduce the BOM and the required board area for my applications.

Are there any downsides of using the TPSI3xxx series for these applications, any parameters of the part that would make it disadvantageous compared to normal isolated gate drivers and seperate isolated gate driver supplies? (The only thing I've come up with so far is the missing deadtime/shoot-through prevention)

Simplified example schematic:

Another (related) question:

If I were to use normal (isolated) half-bridge gate drivers for this BLDC application, could I use the TPSI3050 just as an isolated drive power supply (10V) for one (or more) of the gate drivers?

This is probably even cheaper than using a small isolated DC/DC module to power the gate drivers, if the gate charges and switching frequency don't get to big...

Simplified example schematic:

  • +1
    TI__Expert 7841 points

    Hello Florian,

    Thanks for reaching out to our team on E2E!

    You are well-informed about the devices, thank you for your research. Yes, TPSI305x can be good fit here for reasons you mentioned.

    Florian Sonnenberger said:
    Are there any downsides of using the TPSI3xxx series for these applications, any parameters of the part that would make it disadvantageous compared to normal isolated gate drivers and seperate isolated gate driver supplies? (The only thing I've come up with so far is the missing deadtime/shoot-through prevention)

    Yes, I am unsure how much shoot-through would be acceptable in your application. Based on the EN to VDRV delay, I think there could be up to microseconds of mismatch between separate TPSI305x devices.

    Florian Sonnenberger said:
    If I were to use normal (isolated) half-bridge gate drivers for this BLDC application, could I use the TPSI3050 just as an isolated drive power supply (10V) for one (or more) of the gate drivers?

    Yes, TPSI305x transfers up to 83 mW of power so provided the consumption is equal or less than this, TPSI305x can act as an isolated supply. Can refer to the device calculator for further implementation details.

    Best regards, 
    Tilden Chen

    Solid State Relays | Applications Engineer

  • 0 in reply to Tilden Chen
    Prodigy 40 points

    Hello Tilden,

    Thank you for your quick reply.

    The longer propagation delay is a good point, that I didn't even look for when I skimmed through the datasheets. I probably just assumed it was in the same ballpark as isolated half-bridge drivers.

    I will have to do some calculations and tests. Thanks again!