danmicro
Newbie level 4

Hi. I am a beginner in analog design. I want to make a PWM boost converter (Vin=1.8 , Vout=5). My problem is, at the start, the feedback voltage is very low since the output of my boost is not yet reach. Now the output of my error amplifier is always high (near VDD=1.8). My sawtooth amplitude is only 1.5 and i cant go beyond VDD. Therefore there is no pulse generated. How do i fix this problem?