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LM2577: Compensation capacitor

Y.Ottey
Mastermind 6145 points
Part Number: LM2577

Dear all,

Our customer would like to know about compensation capacitor.

Please answer questions below.

  1. As for the yellow highlight part in the description below(Datasheet p.20"2. Compensation Network (RC, CC) and Output Capacitor (COUT) Selection" ), is "drawing huge currents from the input power supply" mean that excessive current flows to the VIN terminal?
  2. Does the phenomenon described in this yellow highlight occur even when Cc is less than 0.22 uF?

  • 0
    TI__Mastermind 34201 points

    Hi Ottey,

    1. It means without big enough Cc, MOSFET duty cycle will rise to 90% very quickly. Huge current comes FROM VIN terminal.

    2. Yes. Please make sure Cc bigger than 0.22uF.