Ir2110 ho

Discussion in 'The Projects Forum' started by dexterpoet, Jul 5, 2013.

  1. dexterpoet

    Thread Starter New Member

    Jul 5, 2013
    Hi All,

    I am having a challenge with the IR2110 driver, I have been able to generate my PWM signals for the HIN and LIN, but the HO output voltage is constant (almost at Vcc) and LO is zero.

    How do I confirm the HO and LO without the mosfets and load connected to it, as I do not want to damage them, or do I have to connect them to see that they are switching properly. I have attached the pictures below. Thanks.

    pic 1: Vcc (13) is connected to ground
    pic 2: Complementary PWM signals
    pic 3: HO (green) and LO (red) outputs
    Last edited: Jul 5, 2013
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    Just connect everything as it's supposed to be but do not put voltage on the drain of the upper MOSFET (bus voltage) or connect a power supply with current limiting.
    dexterpoet likes this.
  3. dexterpoet

    Thread Starter New Member

    Jul 5, 2013
    Thanks praondevou,

    I will try this as soon as I get back to the lab, as it is closed over the weekends. However, my PWM signal into the HIN and LIN are at a maximum of 5volts and a frequency of 2.55kHz, will the bootstrap capacitor of 0.1uF I used be able to charge and discharge to keep the high side mosfet on for the required time?