MP1469 Step Down Cenverter EN Voltage?

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  • pebyungmin
    New Member
    • Dec 2021
    • 5
    • south Korea
    #1

    MP1469 Step Down Cenverter EN Voltage?

    The VCC supply from Dr Mos is not working because the rail is not working.
    1 and 4 are 12V
    2, 3, and 6 are 0V
    No. 5 EN is 6.5V.
    I need to check whether EN's 6.5V is normal or not.
    Even after replacing the chip, the symptoms are the same.
    Attached Files
    Tags: None
    • black0ut
      New Member
      • Aug 2020
      • 7
      • Austria
      #2
      Re: MP1469 Step Down Cenverter EN Voltage?

      Hi yes this seems normal, on page 10 you can see the explanation for enable

      Enable
      EN is a digital control pin that turns the
      regulator on and off: Drive EN HIGH to turn on
      the regulator, drive it LOW to turn it off. An
      internal 1MΩ resistor from EN to GND allows
      EN to float to shut down the chip.
      The EN pin is clamped internally using a 6.5V
      series-Zener-diode as shown in Figure 2.
      Connecting the EN input pin through a pullup
      resistor to the voltage on the VIN pin limits the
      EN input current to less than 100μA.

        Comment

        • pebyungmin
          New Member
          • Dec 2021
          • 5
          • south Korea
          #3
          Re: MP1469 Step Down Cenverter EN Voltage?

          Thank you for answer. But is there no output when all voltages are present? Anything more to check?

            Comment

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