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| 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(yīng)器效率 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 177K |
| 代理商： | AN-19 |
DISCRETE vs. TOPSwitchPERFORMANCE (@ V
IN
= 120 VAC)
3842 + MOSFET
(1.2
/
600V)
34.27 W
39.38 W
87%
5.11 W
76 KHz
June 1996
TOPSwitch
Flyback Power
Supply Efficiency
Application Note AN-19
MOSFET R
DS(ON)
Current Sense Resistor
MOSFET CV
2
f LOSS
MOSFET Crossover Loss
Start Up Circuit
PWM Controller
Output Diode
Clamp Circuit
Miscellaneous Loss
(Input Filter, Bridge,
Transformer, Output Filter,
Secondary Feedback)
Introduction
Efficiency should be a major consideration when designing a
flyback switching power supply. It can impact many aspects of
a product design, from enclosure size and ventilation to safety
qualification. Many design choices affect the efficiency of a
given power supply design, including such seemingly disparate
factors as the value of the bulk storage capacitor, transformer
core geometry and construction, choice of output rectifier, and
snubber and clipper networks. This application note will
concentrate on efficiency comparisons between
TOPSwitch
and conventional power supply designs, efficiency measurement
techniques, and general design considerations for constructing
efficient flyback power supplies using
TOPSwitch
. For a more
detailed treatment of flyback power supply and transformer
design refer to application notes AN-16, AN-17 and AN-18.
TOPSwitch vs. Discrete Design
For a given output power, the efficiency attainable with a
TOPSwitch
flyback power supply is equal to or better than a
conventional power supply design using a PWM IC controller
*A more conventional single resistor start-up circuit will dissipate 1-2 Watts.
Figure 1. Power Loss Comparison for Discrete and TOPSwitch Supplies.
Design Type:
(On Resistance/Voltage Rating)
Output Power
Input Power
Efficiency
Power Loss
Operating Frequency
POWER LOSS BUDGET
Conduction Loss
Switching Loss
Other Losses
0.37 W
0.16 W
0.43 W
1.08 W
0.03 W(1-2 W*)
0.3 W
1.00 W
1.20 W
0.54 W
TOPSwitch
(3.6
/700V)
34.21 W
38.63 W
88.6%
4.42 W
100 KHz
1.07 W
None
0.32 W
Negligible
Negligible
0.05 W
0.98 W
1.07 W
0.93 W
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