problem with ir2110

Discussion in 'The Projects Forum' started by sanjayyadav, Feb 27, 2013.

  1. sanjayyadav

    Thread Starter New Member

    Jul 30, 2012
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    i m using ir2110 for my dc motor driver.whenever the input to lin goes floating the output of ir2110 remains high. please help..
     
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    According to their datasheet the 2110 has a pull-down resistor at the LIN input built-in. Anyway I would not leave it open when unused (floating). Use an external pull-down resistor, whatever value reasonably low but not so low to be a burden for your signal source. For example 10k.
     
  3. sanjayyadav

    Thread Starter New Member

    Jul 30, 2012
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    0
    i tried it. but when the power from the microcontroller(for pwm) goes low the output at lo is still high.also i have inserted a pull down(33k ohm) at lo ,but the problem remains. i have shown the changes in pdf in following attachment:confused:
     
  4. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    Ok then try to connect the input LIN directly to Ground. What happens at the output?
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Depending on how fast your switching your PWM the 1k gate resistor is way too big. A gate resistor should be in the 4.7ohm to 50ohm range. If your PWM is high the gate never has time to shut off using the high ohm resistor.
     
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