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L4981AD Datasheet

  • L4981AD

  • IC-POWER FACTOR CORRECTOR

  • 231.55KB

  • 17頁(yè)

  • ETC

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L4981A - L4981B
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 resistor can be used.
The PFC demoboard performances has been
evaluated testing the following parameters:
PF (power factor), A-THD (percentage of current
total harmonic distortion), H3..H9 (percentage of
current鈥檚 n
th
harmonic amplitude),
鈭?/div>
V
o
(output
voltage ripple), V
o
(output voltage),
畏
(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
(V
rms
)
88
110
132
180
220
260
f
(Hz)
60
60
60
50
50
50
P
i
(W)
222
220
218
217
217
216
PF
A-THD
(%)
H3
(%)
1.98
1.40
1.16
1.52
1.68
1.84
H5
(%)
0.61
0.40
0.40
0.65
0.83
1.30
H7
(%)
0.55
0.31
0.35
0.40
0.57
0.39
H9
(%)
0.70
0.28
0.31
0.34
0.48
0.73
V
O
(V)
390
392
394
396
398
400
鈭哣
O
(V)
8
8
8
8
8
8
PO
(W)
200
201
202
203
204
205
畏
(%)
90.2
91.6
92.8
93.8
94.2
95.2
0.999
0.999
0.999
0.999
0.997
0.995
2.94
1.79
1.71
1.88
2.25
3.30
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.
T1
LINE
C1
T2
PFC
C
EARTH
D94IN052
where:
T1 = 1mH
T2 = 27mH
C1 = 0.33碌F, 630V
C2 = 2.2nF, 630V
14/17

L4981AD 產(chǎn)品屬性

  • L4981 View All Specifications

  • 40

  • 集成電路 (IC)

  • PMIC - PFC（功率因數(shù)修正）

  • -

  • 平均電流

  • 100kHz

  • 100µA

  • 14.5 V ~ 19.5V

  • -40°C ~ 125°C

  • 表面貼裝

  • 20-SOIC（0.295"，7.50mm 寬）

  • 20-SO

  • 管件

  • 497-5523-ND - EVAL BOARD FOR L4981

  • 497-1414-5

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