Open Load - Driver circuit

Discussion in 'General Electronics Chat' started by Flexon Cutinha, Jan 11, 2019.

  1. Flexon Cutinha

    Thread Starter New Member

    Mar 17, 2017
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    0
    Hello,
    I have a driver circuit driving a Power n-mosfet, If I dont connect any load at source of Mosfet what would be the voltage at Vout when my input is low?
    upload_2019-1-11_11-7-36.png
     
  2. jpanhalt

    Expert

    Jan 18, 2008
    6,564
    1,303
    What is Vin relative to VDD?
     
  3. Flexon Cutinha

    Thread Starter New Member

    Mar 17, 2017
    2
    0
    Vin Would be basically a Pwm Input signal with voltage levels at 0-4V. The Driver Output driving the Mos would have a voltage level varrying from 0 to 2VDD.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    9,032
    2,131
    If the driver is of the bootstrap type, which relies on the source being periodically grounded to provide a boosted gate voltage for high-side switching of a load, then it won't generate 2x Vdd, the FET won't turn on and with no load the source will probably drift up to Vdd through leakage.
     
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