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NCP1650
DESIGN GUIDELINES
D 1
LOOP COMP
V CC
1
+
V in
D 2
D 3
D 4
C in
R 7
C 7
7
FB/SD
6
4.24 V
4V
+
--
ERROR
AMP
--
VOLTAGE/POWER
ORing NETWORK
REFERENCE
REGULATOR
4V
6.5 V
2
V ref
0.1 m F
C ref
P COMP 3.68 V
+
--
0.85 V
--
+
SHUTDOWN
UVLO
R 8
C 8
R 9
8
P max
9
C 9
a
POWER
MULTIPLIER
2.5 V
POWER
AMP
+
--
1.08 V ref
4V
--
+
OVERVOLTAGE
COMPARATOR
INRUSH
LIMITER
(OPTIONAL)
p
--
R ac1
AC INPUT
5
AC REF
a
REFERENCE
MULTIPLIER
p
AC ERROR AMP
+
0.75 V line +
k ? I in = V ref
AC
REFERENCE
BUFFER
V--I
16 k
4V
--
+
PWM
S
S
R
Q
L 1
4
25 k
4.5 V
D 5
R DC1
R ac2
C ac
AC COMP
3
C 4
R 3
C 3
GND
20 k
+
--
60 k
AVERAGE CURRENT
COMPENSATION
RAMP
COMPENSATION
OSCILLATOR
CURRENT
SENSE
AMPLIFIER
DRIVER
+
OUT
16
Q1
C out
R shunt
to FB
R DC2
15
--
I S--
12
13
14
C T
I avg 10 11 I avg fltr
RAMP
COMP
R 13
C T
R 10
C 11
Note: This is a theoretical design, and it is not implied that a circuit designed by this procedure will operate properly without normal
troubleshooting and adjustments as are common with any power conversion circuit. ON Semiconductor provides a spread sheet that
incorporates the following equations, and will calculate the bias components for a circuit using the above schematic.
Figure 40. Typical Application Schematic
Basic Specifications
The design of any power converter begins with a basic set
of specifications. As a minimum, the following parameters
should be known before beginning:
Po max (Maximum rated output power)
Vrms min (Minimum operational line voltage)
Vrms max (Maximum operational line voltage)
f switch (Nominal switching frequency)
V out (Nominal regulated output voltage)
Most of these parameters will be dictated by system
requirements. The output voltage may not be defined. In
general, it should be slightly greater than the peak of the line
waveform at high line. For a 265 v rms input, the peak line
voltage would be 375 volts, and 400 volts is a standard
output voltage. In no case should it be less than the peak
input line voltage.
Inductor
For an average current mode, fixed frequency PFC
converter, there is no magic formula to determine the
optimum value of the inductor. There are several trade--off ’s
that should be considered. These include peak current vs.
average current, and switching losses vs. core losses. All of
these are a function of inductance, line and load. These
parameters determine when the converter is operating in the
continuous conduction mode and when it is operating in the
discontinuous conduction mode.
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