參數(shù)資料
型號(hào)： AN-16
英文描述： TOPSwitch Flyback Design Methodology
中文描述： TOPSwitch的反激式設(shè)計(jì)方法
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 247K
代理商： AN-16
A
6/96
AN-16
11
In-depth Information
Step 1. Determine system requirements: V
ACMAX
, V
ACMIN
,
f
L
, f
S
, V
O
, P
O
,
η
, Z
The step-by-step procedure uses predetermined parameter values
such as V
, V
, V
, V
and V
for most commonly
encountered input voltage ranges: 85 to 132 VAC for 100/115
VAC, 195 to 265 VAC for 230 VAC and 85 to 265 VAC for
universal input. A
±
15% line voltage variation is assumed in all
cases. Applications with a different input voltage range can be
handled by following the information and methods provided in
Step 3, 4 and 5 of this in-depth information section to derive
appropriate values for C
IN
, V
OR
, V
CLO
and V
MIN
.
Efficiency
η
is the ratio of output power to input power. Since
efficiency can vary significantly with output voltage due to
secondary diode loss, it is best to use a number that is
representative of similar power supplies. Switching power
supply efficiencies typically range from 75% for supplies
delivering most of their power at low voltage outputs (5 or
3.3V) to 85% for those supplying most of their power through
higher voltage outputs (12V and above). If this data is not
available, 80% is a reasonable choice.
For a power supply with an output power P
and an efficiency
η
, P
x (1-
η
)/
η
watts of power is lost somewhere in the system:
part in the secondary circuits, and the balance in the primary
circuits. It is important to know the loss distribution between
primary and secondary because only the secondary losses
represent power that must be processed by the transformer and
considered in the transformer design. Note that the power
dissipated at the primary clamp is considered as secondary loss
because this power is processed by the transformer before being
delivered to the clamp circuit. The ratio of the secondary loss
to the total loss is defined as the loss allocation factor, Z, which
should be set based on experience. A value of 0.5 should be used
if no reference data is available.
Step 2. Decide on a Feedback/sense circuit and bias
voltage V
B
Four types of feedback/sense circuits are recommended. The
primary feedback circuit, shown in Figure 3, is the least expensive
but has lower absolute accuracy and regulation and is suitable
only for low power and higher output voltage (V
>5V). Output
accuracy can be improved for the primary feedback circuit by
adding a 22V Zener and a capacitor as shown in Figure 4. The
Figure 3. RD1 Reference Design Board.
PI-1850-050696
+5V
RTN
C1
10 nF
400 V
C5
47
μ
F
10 V
D2
1N5822
D3
1N4148
C2
330
μ
F
10 V
T1
D1
C3
100
μ
F
10 V
R1
15
VR1
L1
3.3
μ
H
+
-
U1
D
C
S
S
TOP
210
2
1
3
4
5
8
DC
INPUT
TRD1
相關(guān)PDF資料
PDF描述
AN-17 Flyback Transformer Design for TOPSwitch Power Supplies
AN-18 TOPSwitch Flyback Transformer Construction Guide
AN-19 TOPSwitch Flyback Power Supply Efficiency
AN-20 Transient Suppression Techniques for TOPSwitch Power Supplies
AN-22 OBSOLETE when inventory is depleted. 10% tolerance no l
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