- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364677 > AN-23 TinySwitch Flyback Design Methodology PDF資料下載
參數(shù)資料
| 型號(hào)： | AN-23 |
| 英文描述： | TinySwitch Flyback Design Methodology |
| 中文描述： | 據(jù)稱，TinySwitch反激式設(shè)計(jì)方法 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 401K |
| 代理商： | AN-23 |
AN-23
A
7/99
8
Step 14.
Recalculate D
MAX
for continuous mode of operation from
V
MIN
and V
OR
.
Start continuous mode design.
Recalculate D
MAX
as:
D
V
+
V
V
MAX
OR
OR
MIN
=
Step 15.
Calculate K
RP
from V
MIN
, P
O
,
η
, I
P
, and D
MAX
.
K
is the ratio between the primary ripple current I
R
and
primary peak current I
P
. And I
P
is 90% of minimum I
LIMIT
.
From AN-16,
I
I
K
D
P
AVG
)
RP
2
MAX
=
×
(
1
and
I
P
V
AVG
O
MIN
=
×
η
By combining the above equations, K
RP
can be expressed as:
K
I
D
D
V
V
P
I
RP
P
MAX
MIN
O
P
MAX
MIN
=
×
×
×
×
×
×
×
2
(
)
η
η
Step 16A, B, C.
Check K
RP
against 0.6.
K
RP
≥
0.6, go to Step 17B.
K
RP
< 0.6, set K
RP
= 0.6.
- Recalculate D
MAX
using Step 15 equation.
- Recalculate V
using Step 14 equation.
- If V
OR
< 150 V, go to Step 17B.
- If V
> 150 V, go back to Step 7and select higher
current
TinySwitch
.
Step 17A, B.
Calculate primary inductance L
P
.
Discontinuous mode:
L
P
I
f
Z
P
O
P
S
=
×
×
×
×
×
×
η
+
10
1
0 9
.
1
2
1
6
2
(
)
η
η
Continuous mode:
L
P
K
K
I
f
Z
P
O
RP
RP
2
P
S
=
×
×
)
×
×
×
×
×
η
+
10
1
1
.
0 9
1
6
2
(
(
)
η
η
I
is 90% of minimum I
from
TinySwitch
data sheet as
previously defined in Step 8.
f
is minimum switching frequency from
TinySwitch
data
sheet.
Please note the cancellation effect between the over
temperature variations of I
P
and f
S
resulting in the additional
1/0.9 term.
Z is loss allocation factor. If Z = 0, all losses are on the
primary side. If Z = 1, all losses are on the secondary side.
Since output diode loss and clamp/snubber loss are both
secondary losses, Z = 1 is a reasonable starting point.
Step 18.
Design Transformer.
Calculate turns ratio N
P
/N
S:
N
N
V
V
V
P
S
OR
+
O
D
=
Selecting core and bobbin
- With triple insulated secondary wire and no margin
winding, EE16 core is suitable for most
TinySwitch
applications.
- To accommodate margin winding, EEL16 core must be
used.
- In below 2 W and/or space constrained applications,
EE13 or EF13 cores with special bobbin meeting safety
requirements may be used.
Calculate primary and secondary number of turns for peak
flux density (B
) not to exceed 3000 gauss.
Limit B
P
to 2500 gauss for low audio noise designs.
Use the
lowest practical value of B
for the greatest reduction in
auido noise. See AN-24 for additional information.
Calculate primary number of turns (N
P
)
N
I
L
×
B
A
P
P
P
e
=
× ′ ×
100
where I
’
P
equals to maximum I
LIMIT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AN-29 | TOPSwitch-GX Flyback Quick Selection Curves |
| AN-30 | TOPSwitch-GX Forward Design Methodology |
| AN-31 | DPA-Switch Forward Converter Design Guide |
| AN-32 | TOPSwitch-GX Flyback Design Methodology |
| AN-37 | LinkSwitch-TN Design Guide |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AN230 | 制造商:Panasonic Industrial Company 功能描述:IC |
| AN231 | 制造商:Panasonic Industrial Company 功能描述:IC |
| AN2310S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Camera Circuit |
| AN23-11A | 制造商:AN# - MILITARY 功能描述: |
| AN23-14 | 制造商:AN# - MILITARY 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。