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UCC28950 REFERENCE VOLTAGE (VREF) IS VARRYING

Other Parts Discussed in Thread: UCC28950, UCC27324

Dear Sir

I am using UCC28950 pwm ic for Full bridge converter. Now i have connected only the control circuits and gate driver. No other power circuit is connected.

When I am connecting the gate driver IC ( UCC27324 - q1 ) after the UCC28950 IC the reference voltage ( VREF) is neraly 7 Volt. When i am disconnecting the gate driver IC and checking only PWM IC then the reference voltage is coming 5 Volt.

What may be the reason? Please reply as soon as possible.

Aditya