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參數資料
| 型號： | FA13845P |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 穩壓器 |
| 英文描述： | CMOS IC(For Switching Power Supply Control) |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數： | 12/15頁 |
| 文件大小： | 151K |
| 代理商： | FA13845P |
FA13842, 13843, 13844, 13845
12
Fig. 15
Fig. 16
Fig. 17
C9
D7
D8
R17
1M
ER AMP
2R
1mA
1R
OSC
REF
+
8
4
2
1
5
~
+
~
DB
C10
MOSFET
3
6
FA13842
R18
Rs
C1
T1
AC INPUT
+
R19
Tr6
ON/OFF signal
ER AMP
2R
1R
30V
OSC
REF
+
5
2
1
4
8
7
4. Soft start
A soft-start circuit is shown in Fig. 15.
An aproximate soft-start time is determined with the following
calculation. This soft-start time is defined as the time the ISNS
terminal threshold voltage increases from 0V to 1V.
t
soft-start
[ms]=4.3C9[
μ
F]
5. Suppression of noise at the current sensing
terminal
As each cycle current value is monitored in the current mode
control, there is the possibility that a malfunction will occur
even with a relatively low noise level. Therefore, it is
necessary to add a CR filter to reduce the level of noise at the
current sensing terminal. (See Fig. 16.)
6. ON/OFF circuit with an external signal
A typical ON/OFF circuit is shown in Fig. 17.
The output stage (OUT terminal) is enabled when the voltage
at the FB terminal is reduced to less than 2.0V and is disabled
when the FB terminal voltage increases to more than 3V.
Set the voltage of the FB terminal at a maximum of 5.3V in this
case.
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