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L293D H-Bridge burns please help!

Yue Zhang
Intellectual 780 points

Other Parts Discussed in Thread: L293D

Hi all,

I want to use the L293D H-bridge to simulate a mechanical energy converter, which generates a switching signal between -5V and 5V. But somehow the device is always getting hot. What have I done wrong?

Thanks!

  

  • 0
    TI__Guru**** 169336 points

    Yue,

    To understand the power dissipated, what are the voltages on VCC1 and VCC2?
    Please describe the properties of the load: resistance, inductance.
    What was the switching frequency and duty cycle?

  • 0 in reply to Ron Michallick
    Intellectual 780 points

    Hi Ron, sorry for the late answer. I tried to understand some basics about H-bridge before continuing the discussion. I think my problem was that when I turned on my embedded PC, which controls H-bridge, all pins are set as outputs logic 0, which means they are all grounded. This causes some shortcuts. So now I just cut the H-bridge from my epc until the script runs correctly. 

    Thanks for your help, maybe I will come back to this topic again.