Table of Contents
Advertisement
H. POWER FACTOR CORRECTION CKT (OPTIONAL)
PFC CKT is inserted between the rectifier bridge (D901-D904) and C906, U991A (MC33260)
drives the switching MOSFET, Q901A, is working as a free running, discontinuous voltage
mode. This control way named " follower boost"
Connecting three resistors (R906A, R907A & R908A) between C906 and U991A pin1, to
obtain a feedback current. The feedback current is compared to the reference current so that the
regulation block outputs a DC level at pin 1 to determine the output voltage of C906.
The output voltage of C906 is varied linearly versus the AC line amplitude.
14
Advertisement
Table of Contents
