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Original question:

LM26420-Q1: Full-Load Startup VOUT1 falls then rises after VOUT2 is ramped

LM26420-Q1: Output discharge

beyondeva
Intellectual 340 points
Part Number: LM26420-Q1

Hi

        I want to ask about the discharge time of DC/DC converter LM26420-Q1.

       For example,  if the 2.2V output voltage will drop when the enable signal of the DCDC power supply is turned off,

       then I want to know how to calculate the discharge time required for the 2.2v to drop to 0V?   No need to consider the load of 2.2v.

       2.2V = 2V2_WIFI_BT...

     please refer the screen of the schematic in below...

  • 0
    TI__Genius 15100 points

    Hi,

    How are the PG1,2 pin connected in the schematic? The discharge time depends on the capacitor discharge the output value and the low side FET resistor.

    If you want the device that has a specific discharge function than I would suggest to use the active discharge devices. LM26420-q1 does not offer active discharge function.

    Best regrds,

    Tanvee