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TLV758P: Cff

David Kim2
Genius 3305 points
Part Number: TLV758P

Tool/software:

Hi

I understand that adding Cff is an option.
However, when designing other dc-dc, he said that Cff should be added when it is above a certain output voltage.
Should TLV758p also add Cff depending on the output voltage?

Thanks

  • +1
    TI__Genius 12310 points

    Hi David,

    There isn't necessarily an output voltage dependence for the feedforward capacitor on the TLV758P. If large resistor values (>500kΩ, for example) are used in the feedback network, transient response and PSRR may be degraded due to the feedback resistors interacting with parasitic capacitance from Vfb to GND. Adding a feedforward capacitor helps compensate for the parasitic capacitance, improving transient response and PSRR. 

    Best Regards,

    Alex Davis