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FORWARD CONVERTER
PFC BOOST BIAS and
5VSB SUPPLY


COUPLED
INDUCTOR




PFC and OUTPUT
PWM CONTROL




MAGAMP
REGULATOR for
3.3V OUTPUT




ERROR AMPLIFIER FOR
COMBINED REGULATION
STATUS and OF 5V and 12V
PROTECTION
CIRCUITS
FAN
CONTROL
OV
PROTECTION




Schematic of 250W ATX power supply with
active PFC (reverse engineered by
Vladimir Davydov). Annotated by
http://www.smpspowersupply.com/