IR2110 Hi/Lo driver

Discussion in 'The Projects Forum' started by mhandy, Dec 15, 2006.

  1. mhandy

    Thread Starter New Member

    Dec 14, 2006
    I prototyped an H-bridge servo circuit using the IR2110 Hi/Lo gate driver utilizing the recommended bootstrap method. I PWM the circuit from 31.25nS upto (1,000) to 31.25uS. When I get to about 50% modulation the bootstrap capacitor begins to droop and the under voltage detector disables the driver until the capacitor recharges. I can't fiqure out why this is happening? I expect to at least get to 80% modulation (I know this is the best performance I can expect from this method). I'm using a low leakage schottky diode, and a 10uF tantalum cap. Making this capacitor larger does not seem to improve much. Any ideas?
  2. Søren

    Senior Member

    Sep 2, 2006

    Posting a schematic migh make it possible to help :)