Hi, We have used the LYT6067C for a dimmable LED Driver Circuit design. We have referenced the DER660 Application Note. We have been able to switch on the LED panel but unable to achieve dimming. We have followed the application note thoroughly but we have observed that the OP Amp LT1638 is not injecting any current across the FB path. We are applying PWM at 730Hz and is driving the PWM on a 5V duty cycle. Please help us resolve the issue.