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  1. #1
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    IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    Hi.. I'm facing one issue with IR2110S driver while driving 3 winding BLDC motor(24V,8A rating with Hall sensor feedback) using ifr3710 mosfet(Half bridge configuration).

    Issue :
    When varying duty cycle from 0 to 100 present with 5 percent interval, motor running fine. but when varying duty cycle(PWM) from 0 to 70 percent suddenly, IR2110S driver IC getting failed (with more than 60 percent duty cycle interval observing this effect). there is no IC heat. MOSFET not damaged.

    Operating parameter :

    Switching frequency is 50kHZ.
    bootstrap capacitor is 47uF electrolytic with 0.1uF ceramic in parallel, Used 1K resistor between between gate and source. 47uF and 0.1uF capacitor connected to H bridge 24VDC input.

    Is this due to transient voltage from G and S of MOSFET affecting driver ?

    If yes, Can i use 15V TVS diode between Gate and source of each mosfet to suppress transient voltage from G and S of MOSFET to driver? Now only 1K resistor connected across G and S.

    Please provide me suggestion to solve this issue...

    •   Alt18th May 2018, 11:48

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  2. #2
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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    Hi,

    Problems with IR2110 are frequently discussed here.
    Read through other IR2110 threads.

    In most cases itīs a problem of bad PCB layout, wrong schematic, or wrong drive signals.
    Thus: Read the datasheet. Follow the application recommendations. Read through application notes.

    If this doesnīt help..
    * Show your schematic (not the datasheet one).
    * Show your PCB layout or a photo of your circuit, where we can see signal paths and GND paths.

    Klaus
    Please donīt contact me via PM, because there is no time to respond to them. Thank you.



    •   Alt18th May 2018, 12:12

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  3. #3
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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    Please check the schematic.

    Click image for larger version. 

Name:	driver issue.png 
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    •   Alt18th May 2018, 14:47

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  4. #4
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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    The schematic doesn't show a connection between DC- and IR2015 ground. How does it look on PCB?



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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    usually too much wiring inductance around the half bridge leg can cause the mid point of the leg to go below gnd and kill the driver - try putting a bjt emitter follower pair in between to buffer the gate drive - this usually fixes it - remember to put some anti parallel schottkies across the CE of the xtors, 40V 1A.

    Unless you layout is tight with minimised current loops you will get all sorts of problems...



    •   Alt19th May 2018, 10:37

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  6. #6
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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    Hi,

    usually too much wiring inductance around the half bridge leg can cause the mid point of the leg to go below gnd and kill the driver
    true.

    try putting a bjt emitter follower pair in between to buffer the gate drive - this usually fixes it - remember to put some anti parallel schottkies across the CE of the xtors, 40V 1A.
    For me this means: I know what causes the problem, but instead of removing the problem I add additional circuitry to remove just the symptom.

    Thus my recommendation is: Read datasheet and application notes and follow the recommendations to remove the problem.

    Klaus
    Please donīt contact me via PM, because there is no time to respond to them. Thank you.



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    Re: IR2110S Driver failed when suddenly increasing duty cycle to 70 percent

    When you say 70%, do you mean 70% of the half cycle that the fets can be on for?



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