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SLAU508 AC-Coupled Input

Hello, 

I am trying to implement simulation of SLAU508 Analog Pulse Width Modulation, but modifying it for ac-coupled input. I removed R2 from the circuit, per app not, but then the output only generates PWM output on the negative-going half of the input sinewave. It seems the signal on the error-amplifier side of the ac coupling cap is now biased around VCC instead of VCC/2 (VREF). How else can I modify the circuit to enable proper ac-coupling?

Thanks!