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參數(shù)資料
| 型號(hào)： | AN-14 |
| 英文描述： | TOPSwitch Tips. Techniques & Troubleshooting Guide |
| 中文描述： | TOPSwitch的提示。技術(shù) |
| 文件頁數(shù)： | 25/28頁 |
| 文件大?。?/td> | 246K |
| 代理商： | AN-14 |
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B
6/96
AN-14
25
19. Power Factor Correction (PFC)
Nominal output power ranges for PFC applications are given in
Table 4 for each
TOPSwitch
. Refer to DN-7 for recommended
inductance and precompensation resistance values.
19.1 Reverse Drain Voltage
Do not allow the Drain voltage to ring below the Source. Add
a fast recovery, high voltage (200 to 400 V) diode (D2 in Figure
19) in series with the Drain when using
TOPSwitch
in a PFC
circuit. Negative voltages on the Drain will forward bias the
output MOSFET body diode and trigger the internal shutdown
latch. Recycling input power or shorting the Control pin to the
Source pin will be necessary to restart
TOPSwitch
.
19.2 Auto-Restart
In PFC applications, precompensation resistor R1 (Figure 19)
drives sufficient current into the Control pin to overcome the
discharge current and effectively stalls auto-restart. If the PFC
circuit does not start the first time, an overload condition exists,
or a short input power interruption occurs,
TOPSwitch
will
enter and stall in auto-restart. Adding a parallel resistor between
typically 2.7 k
and 6.8 k
across C3 provides an additional
PFC Output Power
230/277 VAC Input
0 - 25 W
20 - 50 W
30-75 W
50 - 100 W
60 - 125 W
75 - 150 W
PFC Output Power
110 VAC Input
0 - 30 W
25 - 50 W
35 - 70 W
45 - 90 W
55 - 110 W
Part #
TOP200
TOP201
TOP202
TOP203
TOP214
TOP204
Part #
TOP100
TOP101
TOP102
TOP103
TOP104
Table 4. Recommended PFC Output Power Ranges.
discharge path allowing the auto-restart circuit to function
properly. C3 may have to be adjusted for proper auto-restart
timing.
19.3 Example Power Factor Correction Circuit
The circuit shown in Figure 19 operates from 230 VAC input
with typically 0.985 power factor and 8% Total Harmonic
Distortion (THD) while providing 65 Watts of output power at
410 VDC. Bridge Rectifier BR1 full wave rectifies the AC
input voltage. L1, D1, C4, and
TOPSwitch
make up the boost
power stage. D2 prevents reverse current through the
TOPSwitch
Figure 19. Schematic Diagram of a 65W, 230 VAC Input Boost Power Factor Correction Circuit Utilizing the TOP202.
PI-1423-040495
Vo
RTN
D1
MUR460
R1
200 k
1/2 W
R2
200
R3
3 k
VR1
1N5386B
VR2
1N5386B
D2
1N4935
C1
220 nF
C4
47
μ
F
R8
430K 1/2W
(Bleeder
Resistor)
C2
4.7
μ
F
C3
220
μ
F
R10
6.8 k
L1
500
μ
H
AC
IN
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
TYPICAL PERFORMANCE:
Power Factor = 0.985
THD = 8%
D7
C9
220 nF
D5
D6
D8
L2
33 mH
F1
1
T1220
8
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