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AN2782 데이터시트(PDF) 33 Page - STMicroelectronics

부품명 AN2782
상세설명  Solution for designing a 400 W fixed-off-time controlled
PDF  39 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2782 데이터시트(HTML) 33 Page - STMicroelectronics

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AN2782
Test results and significant waveforms
Doc ID 14763 Rev 2
33/39
The power factor (PF) and the total harmonic distortion (THD) have been measured too and
the results are illustrated in Figure 28, 29, 30, 31. As shown, the PF at full load and half load
remains close to unity throughout the input voltage mains range while, when the circuit is
delivering 70 W, it decreases at high mains range. THD is low, remaining within 30% at
maximum input voltage.
The efficiency is very good at all load and line conditions. At full load it is always significantly
higher than 90%, making this design suitable for high-efficiency power supplies.
The measured output voltage variation at different line and load conditions is shown in
Figure 28
, 29, 30, 31. As shown, the voltage is perfectly stable over the entire input voltage
range. Just at 265Vac and light load, there are negligible deviations of 1 V due to the
intervention of the burst mode (for the “static OVP”) function.
Figure 28.
Power factor vs. Vin and load
Figure 29.
THD vs. Vin and load
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
80
130
180
230
280
Vin (Vac)
Pout =400W
Pout =200W
Pout =70W
0
5
10
15
20
25
30
35
80
130
180
230
280
Vin (Vac)
Pout =400W
Pout =200W
Pout =70W
Figure 30.
Efficiency vs. Vin and load
Figure 31.
Static Vout regulation vs. Vin and
load
65
70
75
80
85
90
95
100
80
130
180
230
280
Vin (Vac)
Pout =400W
Pout =200W
Pout =70 W
Pout =15W
397
398
399
400
401
402
403
404
80
130
180
230
280
Vin(Vac)
Pout =400W
Pout =200W
Pout =70W
Pout =15W



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