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FAN7930C Datasheet(PDF) 12 Page - ON Semiconductor

Part # FAN7930C
Description  Critical Conduction Mode PFC Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

FAN7930C Datasheet(HTML) 12 Page - ON Semiconductor

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12
PFC operation
VCC
VSTART
VSTOP
5V
VINV(=VPFCOUT)
2.240V
2.051V
VRDY
2.500V
t
PFC operation
VCC
VSTART
VSTOP
5V
VINV(=VPFCOUT)
2.240V
2.051V
VRDY
2.500V
t
Figure 25.
Tw o Cases of RDY Triggered HIGH
PFC operation
VCC
VSTART
VSTOP
5V
VINV(=VPFCOUT)
2.240V
2.051V
VRDY
2.500V
t
PFC operation
VCC
VSTART
VSTOP
5V
VINV(=VPFCOUT)
2.240V
2.051V
VRDY
2.500V
t
Figure 26.
Tw o Cases of RDY Triggered LOW
4. Control Range Com pensation: On time is controlled
by the output voltage compensator w ith FAN7930 C.
Due to this w hen input voltage is high and load is light,
control range becomes narrow compared to w hen input
voltage is low . That control range decrease is inversely
proportional to the double square of the input voltage
(
).
Thus
at
high
line,
unw anted burst operation easily happens at light load
and audible noise may be generated from the boost
inductor or inductor at input filter. Different from the
other converters, burst operation in PFC block is not
needed because the PFC block itself is nor mally
disabled dur ing standby mode. To reduce unw anted
burst operation at light load, an internal control range
compensation function is implemented and show s no
burst operation until 5% load at high line.
5. Zero-Current
Detection: Zero-current detection
(ZCD) generates the turn-on signal of the MOSFET
w hen the boost inductor current reaches zero using an
auxiliary w inding coupled w ith the inductor. When the
pow er sw itch turns on, negative voltage is induced at the
auxiliary w inding due to the opposite w inding direction
(see Equation 1). Positive voltage is induced (see
Equation 2) w hen the pow er sw itch turns off.
AC
IND
AUX
AUX
V
T
T
V
(1)
AC
PFCOUT
IND
AUX
AUX
V
V
T
T
V
(2)
w here:
VAUX is the auxiliary w inding voltage;
TIND is boost inductor turns;
TIND auxiliary w inding turns;
VAC is input voltage for PFC converter; and
VOUT_PFC is output voltage from the PFC converter.
PFC Inductor
Aux Winding
VIN
PFC
VOUT
PFC
ZCD
VTH(ZCD)
+
-
VCC
THD optimized
Sawtooth
Generator
Restart
Timer
gate
driver
RZCD
CZCD
Negative Clamp
Circuit
Positive Clamp
Circuit
5
S
Q
R
Q
fMAX
limit
optional
Figure 27.
Circuit Near ZCD
Because aux iliary w inding voltage can sw ing from
negativ e to positive voltage, the inter nal bloc k in Z CD
pin has both pos itiv e and negative voltage c lamping
circuits. When the auxiliary voltage is negative, an
internal circuit clamps the negativ e voltage at the Z CD
pin ar ound 0.65 V by sourcing current to the serial
resistor
betw een the Z CD pin and the auxiliary
w inding. When the auxiliary voltage is higher than
6.5 V, current is sinked through a resistor from the
auxiliary w inding to the ZCD pin.


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