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參數(shù)資料
| 型號(hào)： | FA13845P |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 57 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 151K |
| 代理商： | FA13845P |
FA13842, 13843, 13844, 13845
10
Fig. 8
Fig. 10
Fig. 9
Tr1
+
~
+
C1
DB
R1
AC INPUT
R4
D4
R3
Tr2
Latching signal
ER AMP
30V
2R
1R
+
C2
D1
MOSFET
T1
OSC
REF
7
8
4
2
1
5
+
7
8
4
2
1
5
SCR1
ER AMP
2R
1R
30V
Latching signal
OSC
REF
R5
C5
SCR2
Latching signal
ER AMP
2R
1R
30V
OSC
REF
8
7
4
2
1
5
3.
Latched shutdown
A typical circuit for latched shutdown is shown in Fig. 8.
The voltage of the OUT terminal is kept low if the voltage of the
COMP terminal is low. The voltage of the COMP terminal
must be set at 0.7V or less in the application temperature
range. (See characteristic curve on page 46 ”COMP to ISNS
offset voltage vs temperature”.)
The source current from the COMP terminal is less than about
1.3mA.
Use of a thyristor such as that shown in Fig. 9 is not effective
because the saturation voltage of the thyristor is higher than
0.7V. When a thyristor is used, increase the voltage of the FB
terminal to more than 3V as shown in Fig.10. In the case of a
latched shutdown, it is necessary to supply a current larger
than the hold current of the thyristor structure circuit or of the
thyristor. This current should be provided through a start-up
resistor from the AC input.
Latched shutdown with a thyristor using the COMP
terminal is not effective.
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