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UC27211 turning both high side and low side at the same time

Jose Tamez
Prodigy 30 points

I have a full bridge design based on a couple of the UC27211 IC.

I have problems with the driver output, when I try to turn on the low side the high side seems to be turning on even though there is no signal at the HI input.

The above issue happens to both high sides of the bridge.

  • 0
    TI__Intellectual 2910 points
    Jose,

    This could be a noise issue. If you do not have one already, try adding a capacitor from HI to VSS. Typical values are 1nF to 10nF. You can also try setting LI high at dc and verify whether the HO output shows the same behavior in the absence of switching.

    Could you share more details about your control inputs, e.g., voltage, freq, source impedance?

    - Daniel