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參數(shù)資料
| 型號： | PEF2023 |
| 廠商： | SIEMENS AG |
| 英文描述： | ISDN DC Converter Circuit IDCC |
| 中文描述： | 綜合業(yè)務(wù)數(shù)字網(wǎng)DC轉(zhuǎn)換器電路IDCC |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 145K |
| 代理商： | PEF2023 |
PEB 2023
PEF 2023
Overview
Semiconductor Group
11
08.97
Figure 4
shows the PEB/F 2023 in flyback configuration with transformer isolation using
supply voltage range 3. This application circuit is used to supply the internal IC’s of the
NT from the U-interface and also to supply the S-interface in case of restricted power
mode. The DC/DC-converter begins operating when the input voltage exceeds 38V
(U
ZD
+8V, see supply voltage range 3). In the start-up phase the PEB/F 2023 is supplied
through V
S
. After this start-up phase, the PEB/F 2023 is supplied via V
EXT
(power
housekeeping input) and the DC/DC-converter will operate until the input voltage falls
below 20V (input undervoltage detection). For power saving reasons the value of resistor
R
6
is as high as possibile.
The maximum static V
S
supply voltage in this example is 120V. How to get a higher
maximum dynamic V
S
supply voltage see chapter 1.6 Surge Protection“ on pages 14
and 15.
To get a very fast input undervoltage detection see chapter 1.7 Fast Input Undervoltage
Detection“ on page 15.
Figure 4
PEB/F 2023 in Flyback Configuration with Transformer Isolation
41 (20) ... 120 V
PEB 2023
PEF 2023
V
REF
9
1
2
3
4
GA
5
V
EXT
6
C
SS
7
V
S
GND
13
11
UV
12
UVx
8
10
VSYNC
P
RC
14
COMP
V
N
I
P
+
BAW 76
N1
N3
0 V
+
+
N2a220μF
20%
+
+ 5 V
0 V
BYS 21-45
BZV55C33
BSP 89
+
N2b
+
- 42 V
BAS 21
N2c
+
BYS 21-45
2.2 V
R
Load1
82/1%
R
Load2
3.9Κ/1%
R
Load3
130/1%
AAA
AAA
68μF
20%
100μF
20%
0.56/5%
0.47μF
20%
C
5
C
C
L2
C
L3
10μF
20%
C
4
C
1
1nF
5%
R
1
39Κ
5%
1μF
20%
C
3
47Κ/5%
100nF
10%
R
2
C
2
68Κ/1%
33Κ
1%
R
3
R
4
D
1
D
2
D
3
D
4
T
1
R
5
R
6
10Μ/10%
C
6
100μF
20%
ZD
1
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