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)： 13/32頁(yè)
文件大?。?/td> 247K
代理商： AN-16
A
6/96
AN-16
13
PI-1853-050696
15 V
RTN
BR1
400 V
C1
47
μ
F
400 V
C5
47
μ
F
C4
0.1
μ
F
U1
TOP204YAI
R3
6.2
R2
200
1/2 W
D2
MUR610CT
D3
1N4148
C2
1000
μ
F
35 V
T1
D1
C7
1 nF
Y1
DRAIN
SOURCE
CONTROL
C3
120
μ
F
25 V
U2
NEC2501
U3
TL431
R4
49.9 k
C9
0.1
μ
F
R5
10 k
R1
510
VR1
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
L2
33 mH
L
N
Figure 6. ST204A Reference Design Board.
a corresponding pay back in terms of higher V
or lower
ripple, whereas lower values of C
result in significantly lower
V
increasing
TOPSwitch
cost due to increased peak operating
current demand. Lower values of C
also increase input ripple
voltage, which could increase output ripple voltage if the
control loop gain is a limiting factor.
The accurate calculation of V
for a given C
(or vice versa)
is a very complicated task which involves the solving of an
equation with no closed form solution. The equation shown
below represents a good first order approximation which is
accurate enough for most situations.
V
V
P
f
t
C
MIN
ACMIN
O
L
C
IN
=
×
×
×
×
×
(
)
2
2
1
2
2
η
t
C
is typically 3 ms, and can be verified by direct measurement.
Step 4. Determine reflected output voltage V
OR
and
clamp Zener voltage V
CLO
:
opto-coupler feedback using an accurate reference/comparator
(Figure 6) such as the TL431 for sensing provides high accuracy
and regulation at a slightly added cost and is applicable to all
power and voltage ranges. An intermediate solution is to use an
opto-coupler with a Zener sense circuit (Figure 5). This
technique is suitable for medium power levels (up to 30W) and
is reasonably accurate, especially at output voltages higher than
5V.
Step 3. Determine input capacitor C
IN
and minimum
DC input voltage V
MIN
When the full wave rectified AC line is filtered with an input
capacitance C
(Figure 1), the resulting High Voltage DC bus
(V+) has a ripple voltage as shown in Figure 7. The minimum
DC voltage V
occurring at the lowest line voltage V
is
an important parameter for the design of the power supply. A
rule of thumb on choosing the C
value is to use 2 to 3
μ
F per
watt of output power for 100/115 VAC or universal input, and
1
μ
F/Watt for 230VAC. This results in a V
of 90VDC for
100/115VAC or universal input and 240VDC for 230VAC,
respectively. The C
value obtained by using this rule represents
a nearly optimum design in terms of system cost in most
applications. Higher values of C
IN
increase capacitor cost without
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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