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參數(shù)資料
| 型號： | AN701 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller |
| 中文描述： | 設(shè)計(jì)高頻型DC - DC轉(zhuǎn)換器隨著Si9114A開關(guān)模式控制器 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 1113K |
| 代理商： | AN701 |
AN701
Vishay Siliconix
www.vishay.com
12
Document Number: 70575
16-Jan-01
Figure 22
DC-to-DC Converter Block Diagram
C
3.3 F
100 V
C
10 F
25 V
D
1
D
2
L
EF12.6
9.7 H
–
+
C
3.3 F
100 V
V
CC
SENSE
OUT
–
V
IN
SYNC
C
OSC
R
OSC
SS
COMP
FB
NI
V
REF
SHD
+V
IN
R
1
, 1
R
2
, 1
IC1
Si9420DY
TX1
PL-25
C
22 pF
D
3
R
390 k
R
220
R
4
10
C
2.2 F
25 V
C
220 pF
C
100 pF
R
68 k
C
100 nF
C
100 nF
R
6
R
10
1 k
R
12
1 k
R
11
1 k
C
2.2 nF
IC4
TL431
IC2
Si9114A
SHUTDOWN
SYNC
14
13
12
11
10
9
8
4
5
6
7
3
2
1
6
5
4
3
2
1
NC
1 k
1 k
47
TCMT1020
D5SC4M
35 T
11 T
11 T
D5SC4M
C
10 F
25 V
–
+
5 V
4 A
36
–
72 V
DC
D3, D4 LS4148
Since this choke must carry the full output current, the
minimum number of turns required on this core is given by:
N
min
L
choke
x I
Choke
B
max
x A
min
where B
max
is the maximum flux density used, and A
min
is
the minimum core area. In this case B
max
= 200 mT and
A
min
= 13 mm
2
. Substituting in this equation yields:
N
min
8 H x 3 A
200 mT x 13 mm
2
9.2 T
In this case it was decided to wind 3 layers of 12 turns of
0.315 mm in one layer each across the bobbin. This allowed
the best fill factor of the bobbin, maximizing copper area.
The result yields a choke having a dc resistance of 22 m and
therefore a dc copper loss of P = I
2
R
DC
= 9 x 0.022 = 200 mW
with 3 A dc. Using a core set with an A
L
value of 45, a
transformer of L = N
min2
x A
L
= 12
2
x 45 x 10
-9
= 6.48 H was
calculated. Measured value was 9.73 H: slightly higher, but
acceptable.
See appendix A for a design using these specifications.
The switching waveforms in Figure 23 show that the resonant
reset is limiting the peak voltage to 120 V, well below the
maximum rating of 200 V. Note the leading edge spike caused
mainly by the peak gate current.
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