Sg3525 ir2110 smps rarest1/22/2024 The optocoupler complicates this as it introduces an extra pole. SG5325 and IR2110 do make a good combination for an offline regulated half bridge, you don't need to use a "dedicated half bridge driver" as DjLeco said. SG3525 is a voltage mode controller, which is right for the half-bridge topology, but typically requires type III compensation which you don't have. What you're doing there is putting a heavy capacitive load on an open loop opamp so it's no wonder it doesn't work. The error amp in the SG3525 is not a transconductance amp, its your average everyday simple voltage feedback opamp and so it is compensated with an RC network from the comp pin to the inverting input, not to ground. I would say if possible, next test it with a fixed duty cycle to see if taking the feedback loop out of the equation makes a difference. That can eliminate one source of nasty transformer hiss, especially if the hiss changes when you probe it with the scope. I'd recommend putting a class Y2 capacitor from primary to secondary ground for starters. This goes for res_smps too, your simulation is oscillating, presumably from an unstable feedback loop. Normally even if it's an unstable feedback loop that oscillates, it will oscillate around the right DC point. Your feedback and compensation circuits don't looks right but I'm not entirely sure that's your problem.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |