L6566A_08 Datasheet, PDF (46/51 Pages) STMicroelectronics – Multi-mode controller for SMPS with PFC front-end

Application examples and ideas
Figure 31. Frequency foldback at light load (FF operation)
R1
R2
MODE/SC
Vref
12
10
COMP
L6566A ⁹
BC857
13
OSC
RT
L6566A
Figure 32. Latched shutdown upon mains overvoltage
Vin
Vin
Vcc
5
BC847
L6566A ^{8 DIS}
15 _VFF
BC857
Vref
DIS
10
8 _{L6566A 15 VFF}
Rq
>10 Rq
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