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FAN7930MX Datasheet(PDF) 15 Page - Fairchild Semiconductor

Part # FAN7930MX
Description  FAN7930 Critical Conduction Mode PFC Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN7930MX Datasheet(HTML) 15 Page - Fairchild Semiconductor

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© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN7930 • Rev. 1.0.1
15
1.5V
150ns
1.4V
ON
FAN7930 Rev.00
VZCD
t
IINDUCTOR
MOSFET gate
INEGATIVE
ON
IIN
IMOSFET
IDIODE
Figure 36.
Input and Output Current Near Input
Voltage Peak
Figure 37.
Input and Output Current Near Input
Voltage Peak Zero Cross
To improve this, lengthened turn-on time near the zero
cross region is a well-known technique, though the
method may be different from company to company and
may be proprietary. FAN7930 emdodies this by sourcing
current through the ZCD pin. Auxiliary winding voltage
becomes negative when the MOSFET turns on and is
proportional to input voltage. The negative clamping
circuit of ZCD outputs the current to maintain the ZCD
voltage at a fixed value. The sourcing current from the
ZCD is directly proportional to the input voltage. Some
portion of this current is applied to the internal sawtooth
generator
together
with
a
fixed-current
source.
Theoretically, the fixed-current source and the capacitor
at sawtooth generator decide the maximum turn-on time
when no current is sourcing at ZCD clamp circuit and
available turn-on time gets shorter proportional to the
ZCD sourcing current.
Figure 38.
Circuit of THD Optimizer
Figure 39.
Effect of THD Optimizer
By THD optimizer, turn-on time over one AC line period
is proportionally changed, depending on input voltage.
Near zero cross, lengthened turn-on time improves THD
performance.
9. Input Voltage Absent Detection: To save power
loss caused by input voltage sensing resistors and to
optimize THD easily, the FAN7930 omits AC input
voltage detection. Therefore, no information about AC
input is available from the internal controller. In many
cases, the VCC of PFC controller is supplied by a
independent power source like standby power. In this
scheme, some mismatch may exist. For example, when
the electric power is suddenly interrupted during two or
three AC line periods; VCC is still alive during that time,
but output voltage drops because there is no input
power source. Consequently, the control loop tries to
compensate for the output voltage drop and VCOMP
reaches its maximum. This lasts until AC input voltage is


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