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參數(shù)資料
| 型號： | AN-19 |
| 英文描述： | TOPSwitch Flyback Power Supply Efficiency |
| 中文描述： | TOPSwitch的反激式電源供應器效率 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 177K |
| 代理商： | AN-19 |
A
6/96
AN-19
5
120 VAC
29.8 W
36.1 W
82.5%
6.3 W
90 VAC
29.8 W
37.8 W
78.8%
8.0 W
INPUT VOLTAGE:
Output Power
Input Power
Efficiency
Power Loss
240 VAC
29.8 W
35.3 W
84.4%
5.5 W
0.81 W
0.05 W
1.3 W
1.5 W
(est.)
0.02 W
0.30 W
0.05 W
0.22 W
0.41 W
0.08 W
0.05 W (est.)
0.13 W (est.)
0.36 W
1 W
0.05 W
1.3 W
1.5 W
(est.)
0.04 W
0.16 W
0.05 W
0.85 W
0.85 W
0.08 W
0.09 W (est.)
0.22 W (est.)
0.30 W
1.2 W
0.05 W
1.3 W
1.5 W
(est.)
0.05 W
0.15 W
0.05 W
2.1 W
1.02 W
0.08 W
0.11 W (est.)
0.32 W (est.)
0.28 W
TOPSwitch(U1)
(CV
2
f+Conduction)
Clamp Diode (D1)
Clamp Zener (VR1)
Output Diode (D2)
Transformer (T1):
Primary
Secondary
Core
Input Choke (L2)
Diode Bridge (BR1)
Output Choke (L1)
Output Filter (C2)
Input Filter (C1)
Bias Winding
and
Feedback Circuits
POWER LOSS BUDGET
input power measurements. RMS-reading meters are not suitable
for use in efficiency measurements on AC circuits. Use of a
RMS meter on the AC input of a power supply operating at less
than unity power factor will provide a grossly understated value
for efficiency. The wattmeter should have enough resolution in
the power range of interest to perform accurate measurements.
Also, the meter should be capable of handling waveforms with
a crest factor (ratio of peak value to RMS value) of at least 3:1.
The capacitor input filter used on most switching power supplies
Figure 6. Power Loss Budget for ST204A at 30 W Output Power.
distorts the input current waveform, resulting in high crest
factor and low power factor (typically 0.6 to 0.8, depending on
AC line impedance and input voltage).
The meter should be connected as shown in Figure 7, with the
voltage sensing leads as close as possible to the input of the
supply, to avoid error due to voltage drop in the input cable.
This voltage drop can cause an error of 1-2 efficiency points,
even for a small power supply.
ST204A PERFORMANCE vs. INPUT VOLTAGE
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