參數(shù)資料
型號(hào)： AN-32
英文描述： TOPSwitch-GX Flyback Design Methodology
中文描述： 的TOPSwitch - GX系列反激式設(shè)計(jì)方法
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 134K
代理商： AN-32
AN-32
10
B
12/02
Step 9. Choose
TOPSwitch-GX
based on AC input voltage,
V
O
, P
O
and
η
using AN-29 selection curves
Choose the smallest
TOPSwitch-GX
using
TOPSwitch-GX
Selection Curves in AN-29.
Identify appropriate selection curves according to AC
input voltage and output voltage, V
.
Continuous mode: Use selection curves as is.
Discontinuous mode: Use selection curves with the output
power derated by 33%. This effectively makes a 10 W
discontinuous design equivalent to a 15 W continuous
design in
TOPSwitch-GX
selection.
Switching Frequency f
: For DIP and SMP packages, set
f
= 132 kHz. For TO-220 package, choose between
66 kHz and 132 kHz.
Step 10. Set I
LIMIT
reduction factor K
I
for External I
LIMIT
external I
default I
LIMIT
where 0.3
≤
K
I
≤
1.0
K
is set by the value of the resistor connected between M
pin and SOURCE pin (Refer to
TOPSwitch-GX
data sheet).
For applications demanding very high efficiency, a
TOPSwitch-GX
bigger than necessary may be used by
lowering I
LIMIT
externally to take advantage of the lower
R
.
If no special requirement, set K
= 1.0.
Calculate I
LIMIT
(min) and I
LIMIT
(max)
Step 11. Validate
TOPSwitch-GX
selection by checking I
P
against I
LIMIT
(min)
For K
I
= 1.0, check I
P
≤
0.96
x
I
LIMIT
(min).
For K
< 1.0, check I
≤
0.94
x
I
(min).
Choose larger
TOPSwitch-GX
if necessary.
Step 12. Calculate primary inductance L
P
Continuous mode
where units are
μ
H, watts, amps and Hz
Discontinuous mode.
where units are
μ
H, watts, amps and Hz
K
P
Continuous
Mode
Discontinuous
Mode
Universal
0.4~1.0
≥
1.0
230
0.6~1.0
≥
1.0
Table 5
Step 6. Determine D
MAX
based on V
MIN
and V
OR
Continuous mode
Discontinuous mode
Set
TOPSwitch-GX
Drain to Source voltage, V
DS
= 10 V.
Step 7. Calculate primary peak current I
P
Continuous mode (K
P
≤
1.0)
Discontinuous mode (K
P
≥
1.0)
Input average current
Step 8. Calculate primary RMS current I
RMS
Continuous mode
Discontinuous mode
Input (VAC)
I
default I
K
LIMIT
LIMIT
I
(min)
(min)
=
×
I
default I
K
LIMIT
LIMIT
I
(max)
(max)
=
×
I
I
K
D
P
AVG
×
P
MAX
=
1
2
I
I
D
P
AVG
MAX
=
×
2
I
P
V
×
AVG
O
MIN
=
η
K
I
LIMIT
=
D
V
V
V
V
MAX
OR
MIN
DS
OR
=
+
(
)
D
V
K
V
V
V
MAX
OR
P
MIN
DS
OR
=
×
+
(
)
I
D
I
3
RMS
MAX
P
=
×
2
I
I
D
K
3
K
RMS
P
MAX
P
P
=
×
×
+
2
1
L
P
I
K
K
f
Z
P
O
P
P
P
S
=
×
×
×
×
×
×
η
+
10
1
2
1
6
2
(min)
(
)
η
η
L
P
I
f
Z
P
O
P
S
=
×
×
×
×
×
η
+
10
1
2
1
6
2
(min)
(
)
η
η
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