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MC33260
http://onsemi.com
19
Figure 38. Circuit Supply Voltage
1
8
7
6
5
2
3
4
D1...D4
+
V
CC
15 V
C
pin8
+
r
R
stup
PDIP- -8 CONFIGURATION SHOWN
MC33260 V
CC
SUPPLY VOLTAGE
Insomeapplications,thearrangementshowninFigure 38
mustbeimplementedtosupplythecircuit.Astartupresistor
is connected between the rectified voltage (or one- -half
wave) to charge the MC33260 V
CC
up to its startup
threshold (11 V typically). The MC33260 turns on and the
V
CC
capacitor (C
pin8
) starts to be charged by the PFC
transformer auxiliary winding. A resistor, r (in the range of
22 ?anda15 VZenershouldbeaddedtoprotectthecircuit
from excessive voltages.
When the PFC preconverter is loaded by an SMPS, the
MC33260shouldpreferablybesuppliedbytheSMPSitself.
Inthisconfiguration,theSMPSstartsfirstandthePFCgets
active when the MC33260 V
CC
supplied by the power
supply,  exceeds  the  device  startup  level.  With  this
configuration, the PFC preconverter doesnt require any
auxiliary winding and finally a simple coil can be used.
PCB LAYOUT
The connections of the oscillator and V
control
capacitors
should be as short as possible.
Figure 39. Preconverter Loaded by a Flyback SMPS: MC33260 V
CC
Supply
1
8
7
6
5
2
3
4
V
CC
SMPS Driver
+
+
+
+
+
+
Preconverter Output
+
DIP- -8 CONFIGURATION SHOWN
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