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參數(shù)資料
| 型號： | AN-17 |
| 英文描述： | Flyback Transformer Design for TOPSwitch Power Supplies |
| 中文描述： | 回掃變壓器設(shè)計的TOPSwitch電源 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 133K |
| 代理商： | AN-17 |
C
6/96
AN-17
11
AWG
LOG CM
S
S
=
×
9 97
.
(5 017
(
))
(Secondary conductors larger than 26 AWG should not be used
due to skin effects. Refer to AN-18 for suggestions on parallel
conductor techniques.)
Bare conductor diameter (in mm) is now determined.
DIA
S
AWGS
3
=
×
1 27
.
×
×
4
2
25 4
1000
50
.
π
The maximum wire outside diameter OD
(in mm) for a single
layer based on number of secondary turns and bobbin width
must also be calculated:
OD
BW
M
N
S
S
=
×
(
)
2
Secondary wire insulation thickness can now be calculated
from the bare conductor outside diameter (determined by
CMA) and the insulated wire outside diameter (determined by
number of turns and effective bobbin width). Note that secondary
insulation thickness INS
(in mm) is the insulation wall thickness
rather than the total insulation thickness used in the primary
winding calculation.
INS
OD
DIA
S
S
S
=
2
Obviously, if insulation thickness INS
is not a positive number,
another transformer design iteration is necessary with either
more secondary layers, a smaller number of secondary turns, or
a transformer core with a wider bobbin.
For insulated wire secondaries, INS
must be equal to or greater
than insulation thickness of the selected wire.
Parallel combinations of wire with half the diameter may be
easier to wind and terminate but the effective secondary CMA
will be half the value of the single winding.
Voltage Stress Parameters:
Maximum drain voltage is the sum of maximum DC input
voltage V
, an estimated drain clamp voltage term based on
V
, and an estimated voltage term related to typical blocking
diode forward recovery. Refer to AN-16 for more detail.
V
V
V
V
DRAIN
MAX
OR
=
+
×
+
1 4 1 5
.
)
20
Maximum peak inverse voltage PIV
for the output rectifier is
determined by transformer primary and secondary number of
turns N
and N
S
, maximum DC input voltage V
MAX
, and output
voltage V
O
.
PIV
V
V
N
N
S
O
MAX
S
P
=
+
×
(
)
Maximum peak inverse voltage PIV
for the bias rectifier is
determined from a similar equation using number of bias turns
N
B
.
PIV
V
V
N
N
B
B
MAX
B
P
=
+
×
(
)
Additional or auxiliary output winding number of turns N
and
rectifier diode peak inverse voltage PIV
can be determined
from the desired value for auxiliary output voltage V
, auxiliary
rectifier diode forward voltage drop V
, output voltage V
O
,
output rectifier diode forward voltage drop V
D
, and number of
secondary turns N
S
.
N
V
V
V
V
N
X
X
DX
O
D
S
=
+
+
×
PIV
V
V
N
N
X
X
MAX
X
P
=
+
×
(
)
Iteration can now be used to reach a final and acceptable
solution for the flyback transformer design.
Iterate number of secondary turns N
or primary ripple to peak
current ratio K
until maximum flux density B
is between
indicated limits and check that gap length L
is higher than
indicated minimum value. B
M
will decrease and L
g
will increase
as N
S
or K
RP
is increased.
Examine primary current capacity in Circular Mils per Amp
(CMA). If CMA is below the specified lower limit of 200,
consider increasing number of primary layers from one to two
or use the next larger core size and perform new iteration. If
CMA is greater than 500, consider using the next smaller core
size. (CMA greater than 500 simply means that the wire
diameter is oversized for the expected RMS current).
The transformer design is now complete. The transformer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AN-23 | TinySwitch Flyback Design Methodology |
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