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Original question:

TPS53647 phase interleaving

TPS53647: 3-Phase design using the CSD95372BQ5MC power stages

Vlad Gorelov
Prodigy 510 points
Part Number: TPS53647
Other Parts Discussed in Thread: CSD95372BQ5MC

Tool/software:

Hello Experts,

I'm reaching out to get some inputs for a customer's design:

They would like to use our TPS53647RTAR controller and 3x CSD95372BQ5MC power stages for a 100A design.

They would like to connect 3 power stages, but according to datasheet table 3, CSP4 needs to connect V3R3 (which should be done through a 0 ohm resistor according to the E2E).

1. Are there some additional requirements for disconnecting Phase 4?

2. Does PWM4 pin needs to be NC (not connected)?

Another related question will be for the CSD95372BQ5MC module:

What will be the power dissipation on the module with this design?

Conditions: Vin=12V, Vout=0.8V, Iout=34A

They're trying to estimate the temperature on CSD95372BQ5MC

Thanks!

  • +1
    TI__Prodigy 120 points

    Hello Vlad Gorelov,

    Thanks for reaching out. Please see my replies for your questions

    1. Are there some additional requirements for disconnecting Phase 4?   No

    2. Does PWM4 pin needs to be NC (not connected)? Yes, it should be NC

    Regarding the power dissipation of the CSD95372BQ5MC, at 34A the power loss is ~3W for Vout=1.2V from datasheet (see image below). So the power loss for Vout=0.8V would be less than 3W (as the switching loss will be same and conduction loss will be reduced for Vout=0.8V)

    Regards,

    Shamveel