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FAN7930C Datasheet(PDF) 16 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) 16 Page - ON Semiconductor

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16
RZCD
VAUX
ZCD
Zero-Current
Detect
5
Vcc
N
1
VREF
IMOT
reset
Sawtooth Generator
CMOT
THD Optimizer
Figure 40.
Circuit of THD Optim izer
VZCD
tON
t
VZCD at FET on
tON get shorter
tON not shorter
tON is typically constant over 1 AC line frequency,
but tON is changed by ZCD voltage.
Figure 41.
Effect of THD Optim izer
By THD optimizer, turn-on time over one A C line per iod
is proportionally changed, depending on input voltage.
Near zero cross, lengthened turn-on time improves THD
performance.
10. VIN-Absent Detection: To save pow er loss caused
by input voltage sensing resistors and to optimize THD,
the FA N7930C omits
AC input voltage detection.
Therefore, no information about AC input is available
from the internal controller. In many cases, the V CC of
PFC controller is supplied by an independent pow er
source, like standby pow er. In this scheme, some
mis match may ex ist. For example, w hen the electric
pow er is suddenly interrupted during tw o or three AC
line per iods; VCC is still live dur ing that time, but output
voltage drops because there is no input pow er source.
Consequently, the control loop tries to compensate for
the
output
voltage
drop
and
V COMP
reaches
its
maximum. This lasts until A C input voltage is live again.
When AC input voltage is live again, high V COMP allows
high sw itching current and more stress is put on the
MOSFET and diode. To protect against this, FA N7930C
checks if the input A C voltage ex ists. If input does not
exist, soft-start is reset and w aits until AC input is live
again. Soft-start manages the turn-on time for smooth
operation w hen it detects AC input is applied again and
applies less voltage and current stress on startup.
VIN
t
VOUT
VAUX
MOSFET gate
IDS
fMIN
DMAX
High drain
current!
VCOMP
Though VIN is
eliminated, operation of
controller is normal due
to the large bypass
capacitor.
Figure 42.
Without VIN-Absent Circuit
VIN
t
VOUT
VAUX
MOSFET gate
IDS
fMIN
DMAX
VIN Absence Detected
NewVCOMP
Though VIN is
eliminated, operation of
controller is normal due
to the large bypass
capacitor.
fMIN
DMIN
Smooth
Soft-Start
Figure 43.
With VIN-Absent Circuit
11. Current Sense : The MOSFET current is sensed
using an external sensing resistor for over-current
protection. If the CS pin voltage is higher than 0.8 V, the
over-current
protection
comparator
generates
a
protection signal. An internal RC filter of 40
kΩ and 8 pF
is included to filter sw itching noise.
12. Gate Driver Output: FAN7930C contains a single
totem-pole output stage designed for a direct dr ive of
the pow er MOSFET. The drive output is capable of up
to +500 / -800 mA peak current w ith a typical rise and
fall time of 50 ns w ith 1 nF load. The output voltage is
clamped to 13 V to protect the MOSFET gate even if the
VCC voltage is higher than 13 V.


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