參數(shù)資料
型號： 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)計方法
文件頁數(shù)： 11/16頁
文件大小： 134K
代理商： AN-32
AN-32
11
B
12/02
Step 14. Set value for number of primary layers L and
number of secondary turns N
S
(may need iteration)
Starting with L = 2 (Keep 1.0
≤
L
≤
2.0 throughout
iteration).
Starting with N
= 0.6 turn/volt.
Both L and N
S
may need iteration.
Step 15. Calculate number of primary turns N
P
and number
of bias turns N
B
Diode forward voltages: 0.7 V for ultra-fast P/N diode and
0.5 V for Schottky diode.
Set output rectifier forward voltage, V
D
.
Set bias rectifier forward voltage, V
DB
.
Calculate number of primary turns.
Calculate number of bias turns N
B
.
Step 16. Determine primary winding wire parameters OD,
DIA, AWG
Primary wire outside diameter in mm.
where L is number of primary layers,
BW is bobbin width in mm,
M is safety margin in mm.
Determine primary wire bare conductor diameter DIA and
primary wire gauge AWG.
Step 17 to Step 22. Check B
, CMA and L
. Iterate if
necessary by changing L, N
S
or core/bobbin until within
specified range
Set safety margin, M. Use 3 mm (118 mils) for margin
wound and zero for triple insulated secondary.
Maximum flux density: 3000
≥
B
M
≥
2000, in gauss or
0.3
≥
B
M
≥
0.2, in tesla.
where units are gauss, amps,
μ
H and cm
2
Z is loss allocation factor and
η
is efficiency
from Step 1.
Step 13. Choose core and bobbin based on f
and P
using
Table 6 and determine A
e,
L
e,
A
L
and BW from core and
bobbin catalog
Core effective cross-sectional area, A
e
: in cm
2
.
Core effective path length, L
: in cm.
Core ungapped effective inductance, A
L
: in nH/turn
2
.
Bobbin width, BW: in mm.
Choose core and bobbin based on f
S
, P
O
and construction
type.
Triple
Insulated
Wire
EF12.6
EE13
EF16
EE16
EE19
EI22
EI22/19/6
EF20
Triple
Insulated
Wire
EF12.6
EE13
EF16
EE16
EI22
EE19
EI22/19/6
EEL16
EF20
EI25
EEL19
EI28
EEL22
EF25
EI22
EE19
E122/19/6
EEL16
EE19
EI22
EI22/19/6
EF20
EF20
EI25
EEL19
EF25
EI30
EPC30
EEL25
E30/15/7
EER28
ETD29
EI35
EI33/29/
13-Z
EER28L
EF32
ETD34
E128
EI28
EI30
E30/15/7
EER28
EF25
EEL22
EF25
EI30
EPC30
ETD29
EI35
EF32
ETD34
E36/18/11 E36/18/11 E30/15/7
EI40
EER35
EI28
EEL25
E30/15/7
EER28
ETD29
EI35
EI33/29/
13-Z
EER28L
EF32
ETD34
EI40
E36/18/11
EER35
ETD39
EER40
E42/21/15
E42/21/20
EI40
EI30
EER28
ETD29
ETD39
EER40
ETD39
EER40
E42/21/15
EI35
EF32
ETD34
E42/21/15 E42/21/20 E36/18/11
E42/21/20 E55/28/21
E55/28/21
EI40
ETD39
EER40
E42/21/15 E55/28/21
E42/21/20
E55/28/21
Table 6. Transformer Core.
66 kHz
132 kHz
Output
Power
0-10 W
10 W-
20 W
20 W-
30 W
30 W-
50 W
50 W-
70 W
70 W-
100 W
100 W-
150 W
>150W
Margin
Wound
Margin
Wound
N
N
V
V
V
P
S
OR
+
O
D
=
×
N
N
V
V
V
V
B
S
B
DB
O
D
=
×
+
+
OD
L
BW
M
N
P
=
×
×
(
)
2
B
I
×
L
N
A
M
P
P
P
e
=
×
×
100
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