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TPSI31P1-Q1: Peripheral circuit design

Jade Lan
Prodigy 260 points
Part Number: TPSI31P1-Q1

Tool/software:

Hi team,

TPSI31P1-Q1 will be used by customer on 1000V platforms. The customer has the following questions about the design of peripheral circuits.

1. Regarding the selection of M1 and M2 in the figure, the customer is considering using IGBTs, but currently only 1200V IGBTs are available. Is there a related discharge design for the spikes generated by the IGBT during switching transients? Is there any risk in using a 1200V withstand voltage IGBT in a project with a maximum operating voltage of 1000V? Alternatively, are there any recommended selections for M1 and M2, not limited to IGBTs?

2. Regarding the selection of Rshunt in the figure, are there any accuracy requirements? Is it necessary to choose an Rshunt with temperature calibration function?

Regards,

Jade Lan

  • 0
    TI__Expert 7396 points

    Hello Jade,

    Thanks for your support and reaching out to our team.

    In our lab testing, we did not have issues with voltage spike from switching. The biggest input ripple I measured in lab was 20V, but may be due to resonance since our input cap did not optimize for ESL. 

    If operating maximum voltage is 1000V, I think 1200V withstand is okay.

    To help provide recommendation, can you share what is your customer's precharge requirement (voltage, capacitance, time)? We typically use SiC MOSFET for >800V design.

    For Rshunt, the accuracy can affect the load current ripple. The EVM uses Rshunt with 1% accuracy. Don't think temperature calibration is necessary, just need to account for derating and select adequate power rating.

    Best regards, 
    Tilden Chen

    Solid State Relays | Applications Engineer

  • 0 in reply to Tilden Chen
    TI__Prodigy 260 points

    Hi Tilden,

    The customer's pre-charge requirements are as follows.

    Link capacitance: 943.71uF±10%

    Pre-charge time 200ms

    Battery voltage 1000V

    Peak inductor current < 15.4A

    Best regards,

    Jade Lan

  • +1 in reply to Jade Lan
    TI__Expert 7396 points

    Hi Jade,

    Thanks for your reply. The EVM can meet this requirement, TPSI31PXQ1EVM. Please evaluate this. The board silkscreen displays 800V but the components can handle 1000V.

    Best regards, 
    Tilden Chen

    Solid State Relays | Applications Engineer

  • 0 in reply to Tilden Chen
    TI__Prodigy 260 points

    Thank you for your reply!