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參數(shù)資料
| 型號： | X9318 |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Digitally Controlled Potentiometer (XDCP)(單DCP,抽頭位置掉電自動保存,高輸出端電壓,可部分替代X9312W) |
| 中文描述： | 數(shù)控電位器（數(shù)字電位器）（單應(yīng)課稅品許可證，抽頭位置掉電自動保存，高輸出端電壓，可部分替代X9312W） |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 269K |
| 代理商： | X9318 |
7 of 22
AN 139
Application Note
www.xicor.com
January, 2001
T1 secondary (terminals 9,11,13 and 10,12,14) provide
output power to the secondary rectifier CR5. The
secondary is appropriately insulated from the primary
to address safety agency isolation issues. CR5 is a dual
Schottky rectifier to minimize rectification losses.
Nonetheless, CR5 heatsink must be sized to adequately
dissipate about 7 Watts. C1/R5 and C2/R6 serve as
output rectifier snubbers.
L1 is the main output inductor which feeds the output
capacitors C3 and C4. L2, C5 and C6 provide high
frequency spike filtering. The node of L1, L2, C3 and C4
is chosen as the output voltage sense point to avoid
including the L2, C5 and C6 double pole in the output
voltage control loop.
C7 serves to short circuit common mode noise generated
via T1 primary to secondary capacitance. C7 is located
close to T1 thereby making this EMI current loop physi-
cally small to minimize magnetic field radiation. This
substantially reduces the common mode noise voltage
which must be attenuated by the Front End EMI filter.
As C1 spans the primary to secondary isolation barrier,
C1 must be a safety agency rated Y capacitor.
There is an additional winding on T1 that is not shown
on the Power Mesh schematic. This winding, terminals 6
and 7, provides primary bias and is shown on the
Primary Control schematic (Fig.6).
Figure 5. Secondary Control
Figure 6. Primary Control
R201
1K
R204
40.2K
R212
47K
R
L
R211
47K
R210
47K
5V
R206
2.49K
R207
2.49K
R208
2.49K
1K
R209
R205
9.53K
R203
2.49K
R202
2.7K
.1
C202
U204
U203
U201
TP 201
TP 202
TP 203
U202
OUTPUT RTN
12V OUTPUT
C201
1000pf
5
6
4
3
8
7
2
1
TO POWER MESH
TO POWER MESH
B
A
R
H
R
W
T1
6
CR301
CR302
220
R317
R316
47K
R315
47K
R313
47K
R312
47K
1000pf
1000pf
C308
100pf
C306
R301
150
C307
470pf
R305
180K
C
R308
3.32K
40.2K
R309
R307
330
180K
R306
V
RAW
+
V
REF
R
T
/C
T
V
FB
V
OUT
I
S
COMP
GND
STAR GND @ Pin 5
STAR @
Pin 3
R303
10K
R304
15K
4.7K
R318
40.2K
5
R314
47K
R311
47K
TP 302
TP 301
TP 303
TP 304
3.3
270pF
C301
47
0.1
C
T
C
C
U
U204
U301
UC3844A
U
C
R
R
6
5000
L301
7
7
2
8 3
4
6
6
7
1
2
4
1
7
2
8
8
3
R
H
3
4
6
5
1
G
E
F
D
TP 305
TP 304
TP 306
R
H
R
W
R
L
R
W
R
L
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