AN828 Datasheet, PDF (2/3 Pages) STMicroelectronics – 1500W - 440V POWER FACTOR CORRECTOR

AN828 APPLICATION NOTE
L4981A PARTS LIST
Boost inductor (T) L = 0.44mH
Core :Thomson - E 55x28x25
Gap = 3mm
Primary Turns = 42 (8 x 0.5mm)
Secondary Turns = 4 (0.15mm)
Co= 940µF = [(4 + 4) x 470µF/315V + 1µF/630V]
C1 = 2.2µF/250Vac
C2 = 220nF/630V
C3 = 330nF
C4 = 220µF/25V
C5 = 1.5nF
C6 = 330nF
C7 = 10µF
Power Switch = STE30NA50-DK
Input Bridge = KPBC25-04
Rs = 10mΩ /1W
R1 = 5.1kΩ /1%
R2 = 220Ω /1%
R3 = 75kΩ/1Ω
R4 = 1M
R5 = 47 /1/2Ω
R6 = 100kΩ
R7 = 27k /1%
R8 + R9 = 3.9kΩ
R10 = 120kΩ
R11 = 3.9kΩ
R12 + R13 = 15Ω
R14 = 820kΩ /1%
R15 = 10kΩ /1%
R16 = 909kΩ
R17 = 10kΩ
D2 = 1N4150 (X 4)
D3 = 1N4150
Table 1: Test Result.
Mains rms
(V)
176
176
176
220
220
220
260
260
260
Vout
(V)
451
444
438
451
445
438
452
446
439
Pout
(W)
509
937
1396
509
941
1396
511
945
1402
Power
Factor
0.998
0.999
0.999
0.996
0.998
0.999
0.993
0.997
0.999
Harmonic Distortion (%)
THD
AH3
2.0
1.9
1.4
1.3
1.0
0.9
2.1
1.9
1.5
1.4
1.0
0.9
2.5
1.9
1.4
1.3
1.1
0.8
Efficiency
(%)
94.2
94.0
94.0
95.6
95.2
95.3
95.1
96.4
96.1
CONCLUSIONS
The evaluation has been done using the "A" ver-
sion of the L4981 controller, without using addi-
tional features obtaining high performance re-
sults, in terms of efficiency and harmonic content.
Further improvements are possible using the ad-
ditional features of the I.C. such as the LFF (pin
16) for the best control of the output voltage or
by the use of the B version to minimise the EMI
filter.
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