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TPS23751: TPS23751 Slope Compensation

keisuke
Intellectual 475 points
Part Number: TPS23751

Hi team,

I know about slope compensation as follows in TPS23751 datasheet Page.32.

"Rs may be used if the internally provided slope compensation is not enough"

 I'd like to know whether the internally provided slope compensation is enough or not in our circuit.

Could you please tell me what kind of evaluation is necessary?

Best Regards,

keisuke

  • 0
    TI__Mastermind 21320 points

    Hello Keisuke,

    Thank you for your question. The internal slope compensation circuit generates a current that imposes a voltage ramp at the positive input of the PWM comparator to suppress sub-harmonic oscillations. This current flows out of the CS pin. If desired, the magnitude of the slope compensation can be increased by the addition of an external resistor (Rs) in series with the CS pin. So if you are seeing sub-harmonic oscillations on your gate then additional compensation can be implemented, but for most cases it is not needed. 

    A good practice is to design a 0 ohm resistor and then you can change it during tests if needed. 

    Regards,

    Michael Pahl 

  • 0 in reply to Michael Pahl
    Intellectual 475 points

    Hello Michael,

    Thank you for your reply.

    I understand.

    Best Regards,

    keisuke