Hi all,
I'm trying to use a IRS21094 to drive a H bridge with a PWM input as show in anex below.
I'm using two differents sources. One is +12V between Vcc and Vss and another is +90V between drain of top MOSFET and COM.
If I connect COM and Vss, the circuit works without error, but to avoid spikes and noise from motors, I want to disconnect the two grounds. When I disconnect COM and Vss, the circuit stops to work.
I think that when I disconnect the grounds, the circuit stops because of the absolute maximum ratings says that Vcc must to be between -0.3V and 25V of COM and this isn't true in my circuit.
Any help?
Thanks
I'm trying to use a IRS21094 to drive a H bridge with a PWM input as show in anex below.
I'm using two differents sources. One is +12V between Vcc and Vss and another is +90V between drain of top MOSFET and COM.
If I connect COM and Vss, the circuit works without error, but to avoid spikes and noise from motors, I want to disconnect the two grounds. When I disconnect COM and Vss, the circuit stops to work.
I think that when I disconnect the grounds, the circuit stops because of the absolute maximum ratings says that Vcc must to be between -0.3V and 25V of COM and this isn't true in my circuit.
Any help?
Thanks
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