Hey all,
I'm having trouble figuring out what D9 does here (the diode across the boost inductors + boost diodes):
http://www.ti.com/lit/df/slur515/slur515.pdf
It seems pretty ubiquitous in PFC/boost design, but I can't for the life of me find out why its there. If I had to guess, I'd say protection against transients and helping charge the output capacitors during startup. Am I right, or is there another reason? They always seem to be low leakage diodes.
Thanks
I'm having trouble figuring out what D9 does here (the diode across the boost inductors + boost diodes):
http://www.ti.com/lit/df/slur515/slur515.pdf
It seems pretty ubiquitous in PFC/boost design, but I can't for the life of me find out why its there. If I had to guess, I'd say protection against transients and helping charge the output capacitors during startup. Am I right, or is there another reason? They always seem to be low leakage diodes.
Thanks