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零件编号 AND8016
描述 Design of Power Factor Correction Circuit Using Greenline Compact Power Factor Controller
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AND8016/D
Design of Power Factor
Correction Circuit Using
GreenlineCompact Power
Factor Controller MC33260
http://onsemi.com
Prepared by
Ming Hian Chew
ON Semiconductor Analog Applications Engineering
APPLICATION NOTE
Introduction
of external components, the MC33260 can control the
The MC33260 is an active power factor controller that follower boost operation that is an innovative mode
functions as a boost pre–converter which, meeting allowing a drastic size reduction of both the inductor and the
international standard requirement in electronic ballast and power switch. Ultimately, the solution system cost is
off–line power supply application. MC33260 is designed to significantly lowered.
drive a free running frequency discontinuous mode, it can
Also able to function in a traditional way (constant output
also be synchronized and in any case, it features very voltage regulation level), any intermediary solutions can be
effective protections that ensure a safe and reliable easily implemented. This flexibility makes it ideal to
operation.
optimally cope with a wide range of applications.
This circuit is also optimized to offer extremely compact
This application note will discuss on the design of power
and cost effective PFC solutions. It does not entail the need factor correction circuit with MC33260 with traditional
of auxiliary winding for zero current detection hence a boost constant output voltage regulation level operation and
simple coil can be used instead of a transformer if the follower boost variable output voltage regulation level
MC33260 Vcc is drawn from the load (please refer to page operation. For derivation of the design equations related to
19 of the data sheet). While it requires a minimum number the IC please refer to MC33260 data sheet.
D1 D3
D2 D4
C1
R6 D5
R7
+
D7 C4
R2
R1
C2
C3
18
27
MC33260
36
45
R3
R5
R4
L1
D5
Q1
+
C5
C6
Figure 1. Application Schematic of MC33260
PFC Techniques
cost. This paper will discuss design of PFC with MC33260,
Many PFC techniques have been proposed, boost which operates in critical conduction mode.
topology, which can operate in continuous and
discontinuous mode, is the most popular. Typically,
continuous mode is more favorable for high power
application for having lower peak current. On the other
hand, for less than 500 W application, discontinuous mode
offers smaller inductor size, minimal parts count and lowest
Discontinuous Conduction Mode Operation
Critical conduction mode operation presents two major
advantages in PFC application. For critical conduction
mode, the inductor current must fall to zero before start the
next cycle. This operation results in higher efficiency and
© Semiconductor Components Industries, LLC, 2002
June, 2002 – Rev. 1
1
Publication Order Number:
AND8016/D
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AND8016 pdf, 数据表
AND8016/D
2
Lp +
ǒ Ǔttotal
Vomin
Ǹ2
*
Vac(LL)
Vomin ILpk
ǒ Ǔ2
+
40
10*6
140
Ǹ2
*
85
140 2.894
85
+ 0.235 µH
Let the switching cycle t = 40 ms for universal input (85 to
265 Vac) operation.
3. The number of turns required for a selected core size
and material is:
NP
+
LPILpk106
BmaxAe
+
0.235
10*3 2.894
0.3 32.1
106 + 70.6 turns [ 71 turns
Using EPCOS E 20/10/6, N67 material, Bmax =0.3 T and
Ae = 32.1 mm2.
4. The required air gap to achieve the correct inductance
and storage is:
lgap
+
4p10*7N2p Ae
LP
+ 4p 10*7 712 32.1
0.235 10*3
10*6
+ 0.856 mm
5. Design of Auxiliary Winding
ǒ ǓNaux +
Vaux NP
Vo * Vac(HL)
+
14
(400
*
71
265)
+ 7.4 turns [ 8 turns
Round up to 8 turns to make sure enough voltage at the
auxiliary winding.
D. To determine the output capacitor
As rule of thumb, for 80 W output, start with 100 mF,
450 V capacitor.
E. Calculation of MOSFET conduction losses
A 4A, 500 V MOSFET, MTP4N50E is chosen. The on
resistance, Rds(on) [ 1.75 W@100°C. Therefore, maximum
power MOSFET conduction losses is:
P(on)max
[
1
6
+
1
6
Rds(on)
2
I Lpk
1.2
1*
Vac(LL)
Vomin
1.75
2.8942
1
*
1.2 85
140
+
0.66
W
F. Design of regulation and overvoltage
protection circuit
The output voltage regulation level can be adjusted by Ro,
Ro
[
Vo
200 µA
+
400
200 µA
+
2
M
Use two 1MW resistors in series.
G. Designing the Oscillator Circuit
For follower boost operation, CT is chosen with below
equation:
2
CT w
Kosc LP
V2ac(LL)
Pin
R2o
V2o * Cint +
2
6400
0.234mH 86.96
852 2 M2
1402 * 15pF + 162 pF
Use 150 pF capacitor.
445
415
385
355
325
295
265
235
205
175 Full Load
145
Half Load
Vacpeak
115
85
85 100 115 1130 145 160 175 190 205 220 235 250 265 280
Vac (V)
Figure 6. Theoretical Vo versus Vac with CT = 150pF
H. Design of the Current Sense Circuit
Choose Rcs = 0.68 W
1. So the current sense resistor losses, PRcs:
PRcs
+
1
6
RCS
I
2
Lpk
+
1
6
0.68
2.8942 + 0.949 W
2. Overcurrent protection resistor, ROCP can be
determined with below equation:
ROCP
+
RCS ILpk
IOCP
+
0.68
205
2.894
µA
+
9600
Use 10000 W resistor. This provide current limit at 3.01 A
versus calculated value of ILpk = 2.894 A.
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