Recently,Our team design a 400w led driver. My task is the LLC part. But,I have a problem.The LLC input voltage is 15v for D pin,12v for VCC pin. The HB pin waveform is not square wave,it's a straight line.I think it can not drive the MOSFET. I don't know why. And I also want to know how to test LCS708 is work properly.I need your help.Thank you.