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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)： | 14/20頁 |
| 文件大?。?/td> | 177K |
| 代理商： | AN-19 |
AN-19
A
6/96
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Optimize the
TOPSwitch
for cost and efficiency.
Use snubbing and damping networks only as required to
keep leakage spikes and EMI within limits.
Transformer Losses
Size the windings in the transformer for low DC loss.
Use multiple strands of small wire or foil windings where
necessary to combat skin effect (AC) losses.
Choose core geometry and winding technique carefully to
minimize leakage inductance.
Keep the AC flux swing in the transformer to reasonable
limits to avoid excessive core loss, use a low loss core
material, and if there is room, select a larger core size to
reduce core loss.
Secondary Losses
Choose an output rectifier with a current rating at least 3
times the continuous output current rating. Use secondary
rectifiers with the lowest forward voltage drop and shortest
recovery time that cost allows. Use Schottky rectifiers
when possible.
Eliminate snubbers on the secondary rectifiers, or design
for the minimum acceptable snubber dissipation to keep
leakage spikes to within safe limits.
Derate the output filter capacitors for 1.5-2 times the output
capacitor ripple current for low losses and long life under
continuous operation.
Summary
General Guidelines
Design the power supply to run at the highest recommended
D
. For 100/115 VAC input supplies using TOP100
series parts and 230 V input supplies using TOP200 series
parts, recommended D
is 40%. For universal input
supplies using TOP200 series parts, recommended D
is
60%. Choose D
by adjusting the secondary to primary
turns ratio for a set value of reflected secondary voltage
(V
) during the
TOPSwitch
off time. For 100/115 VAC
input supplies using the TOP100 series, V
OR
= 60 V. For
230 VAC and universal input supplies, V
OR
= 135 V.
Specific Design Considerations
Primary Circuit Losses
Choose the transformer primary inductance to run in the
continuous mode versus the discontinuous mode to reduce
peak and RMS primary currents.
Choose the inrush limiting thermistor to run as hot as
possible (given sensible component deratings) to reduce
power loss in the thermistor.
Choose an adequately rated input diode bridge to reduce
power loss.
Size the input filter capacitor at 3
μ
F/output watt for
100 VAC and universal input, 1
μ
F/watt for 230 VAC
input, and 2
μ
F/watt for 115 VAC only input with or
without a voltage doubler.
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