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參數(shù)資料
| 型號： | L4981XD |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | POWER FACTOR CORRECTOR |
| 中文描述： | 功率因數(shù)校正 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 228K |
| 代理商： | L4981XD |
The evaluation board has been designed using: a
faster not dissipative start-up circuit, a diode (D2)
to speed-up the MOS start-off time and (even if a
single resistor can be used) an external divider to
improve the precision of the overcurrent thresh-
old.
Further there is a possibility to change the input
threshold voltage using an external divider (R23
and R22) and if an inrush current problem arises
a NTC resistorcan be used.
The PFC demoboard performances has been
evaluatedtesting the followingparameters:
PF (power factor), A-THD (percentage of current
total harmonic distortion), H3..H9 (percentage of
current’s n
th
harmonic amplitude),
V
o
(output
voltageripple), V
o
(output voltage),
η
(efficiency).
The test configuration, equipments and results
are:
AC POWER
SOURCE
LARCET /3KW
PM1200
AC POWER
ANALYSER
EMI
FILTER
PFC
L4981
DEMO
LOAD
D94IN057
V
i
f
P
i
PF
A-THD
H3
H5
H7
H9
V
O
V
O
PO
η
(V
rms
)
(Hz)
(W)
(%)
(%)
(%)
(%)
(%)
(V)
(V)
(W)
(%)
88
60
222
0.999
2.94
1.98
0.61
0.55
0.70
390
8
200
90.2
110
60
220
0.999
1.79
1.40
0.40
0.31
0.28
392
8
201
91.6
132
60
218
0.999
1.71
1.16
0.40
0.35
0.31
394
8
202
92.8
180
50
217
0.999
1.88
1.52
0.65
0.40
0.34
396
8
203
93.8
220
50
217
0.997
2.25
1.68
0.83
0.57
0.48
398
8
204
94.2
260
50
216
0.995
3.30
1.84
1.30
0.39
0.73
400
8
205
95.2
EMI/RFI FILTER
The harmonic content measurement has been
done using an EMI/RFI filter interposed between
the AC source and the demoboard under test,
while the efficiency has been calculated without
the filter contribution.
C1
D94IN052
T1
T2
C
LINE
PFC
EARTH
where:
T1 = 1mH
T2 = 27mH
C1 = 0.33
μ
F, 630V
C2 = 2.2nF, 630V
L4981A - L4981B
14/17
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