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| 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)： | 9/12頁 |
| 文件大?。?/td> | 133K |
| 代理商： | AN-17 |
C
6/96
AN-17
9
L
P
Z
f
I
K
K
P
O
S
P
RP
RP
2
=
×
×
×
η
+
×
×
×
10
1
1
6
2
((
(
))
)
(
)
η
η
Primary inductance L
(in
μ
H) can also be determined from a
simple function of ripple current I
R
, effective primary voltage
(V
-V
), maximum duty cycle D
, and switching frequency
f
as shown below but the resulting value for primary inductance
may be slightly different due to the selected value for loss
allocation factor Z and
TOPSwitch
on-state Drain to Source
voltage V
. The energy equation given above is preferred for
selecting the value of inductance L
while the ripple current
equation given below is best for verifying the L
P
value using
in-circuit measurements.
L
V
V
D
I
f
P MEASURED
(
MIN
DS
×
MAX
R
S
)
(
)
=
×
×
10
6
Number of primary turns N
P
depends on number of secondary
turns N
, output voltage V
O
, diode forward voltage drop V
D
,
effective primary voltage (V
MIN
-V
DS
), and maximum duty cycle
D
MAX
:
N
N
V
V
V
V
D
D
P
S
MIN
DS
O
D
MAX
MAX
=
×
+
×
1
The number of bias winding turns N
is calculated from the
output voltage V
, output diode voltage V
, secondary number
of turns N
S
, target bias voltage V
B
, and bias diode voltage V
BD
:
N
V
V
V
V
N
B
B
BD
O
D
S
=
+
+
×
A
is the effective inductance for the gapped core in nH/T
2
.
Some core vendors offer standard gapped core sets with specified
A
. The transformer manufacturer either procures the gapped
core for the given A
value or grinds the gap to meet the
inductance specification in the finished transformer. A
is
also used to simplify subsequent calculations. A
is calculated
from primary inductance L
(in
μ
H) and number of primary
turns N
P
. Note that A
LG
is specified in nH/(turn)
2
.
A
L
N
LG
P
2
P
=
×
1000
Maximum flux density B
is a dependent iteration variable to
be manipulated between the limits of 2000 and 3000 Gauss by
varying number of secondary turns N
which directly varies
number of primary turns N
P
as previously shown. B
is
calculated from peak current I
, number of primary turns N
P
,
effective gapped inductance A
, and effective core cross
sectional area A
. B
M
can also be calculated from effective
primary voltage (V
-V
), output voltage V
O
, output diode
voltage V
D
, and maximum duty cycle D
MAX
:
B
N
I
A
A
M
P
P
×
LG
e
=
×
10
×
=
×
×
×
×
+
×
N
I
10
A
A
V
V
V
V
D
D
S
P
LG
e
MIN
DS
O
D
MAX
MAX
1
B
is the AC flux density component. The equation gives peak
AC flux density (rather than peak to peak) to use with core loss
curves provided by the core vendor. B
can be calculated from
maximum flux density B
and ripple to peak current ratio K
.
B
AC
can also be calculated from effective primary voltage
(V
-V
), duty cycle, frequency, effective core cross sectional
area, and number of primary turns N
P
:
B
B
K
V
V
D
f
A
N
AC
M
RP
MIN
DS
MAX
×
S
e
P
=
×
2
=
×
×
×
×
10
2
8
(
)
Relative permeability
μ
of the ungapped core must be calculated
to estimate the gap length L
.
μ
is found from core parameters
A
e
(cm
2
), L
e
(cm), and ungapped effective inductance A
L
:
μ
π
r
L
E
e
A
L
A
=
×
×
×
×
0 4
.
10
Gap length L
is the air gap ground into the center leg of the
transformer core. Grinding tolerances and A
accuracy place
a minimum limit of 0.051 mm on L
. L
(in mm) is calculated
from number of primary turns N
P
, core effective cross sectional
area A
e
, primary inductance L
(in
μ
H), core effective path
length L
e
, and relative permeability
μ
r
:
L
N
100
A
L
L
μ
g
P
e
P
e
r
=
×
×
×
×
×
0 4
.
10
2
π
Effective bobbin width BW
takes into account physical bobbin
width BW, margins M, and number of layers L:
BW
L
BW
M
E
=
×
×
(
(
))
2
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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