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參數資料
| 型號： | FSD1000 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Combo Fairchild Power Switch (FPS) |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 73 kHz SWITCHING FREQ-MAX, PDIP12 |
| 封裝： | HEAT SINK/SLUG, DIP-12 |
| 文件頁數： | 11/20頁 |
| 文件大小： | 375K |
| 代理商： | FSD1000 |
FSD1000
11
switching operation. In this manner, the burst operation
alternately enables and disables the switching of the power
MOSFET to reduce the switching loss in the standby mode.
Figure 9. Waveforms of burst operation
5. Sequence of start-up and shutdown :
FSD1000 has a
sequence of the startup and shutdown operation between
main and auxiliary powers. As can be seen in Figure 11,
main power starts up with 30 ms time delay after auxiliary
power starts up. When the AC line is powered off, the main
power shuts down first as the voltage of LS1 pin drops below
1.4V. The auxiliary power shuts down when the voltage of
LS1 drops below 0.8V. Figure 12 shows the shutdown and
restart sequence in the case of auto restart mode protection.
When the protection is triggered, main and auxiliary powers
shut down together. When FSD1000 restarts, the auxiliary
power starts up first and the main power starts up after 30ms.
Figure 13 shows the shutdown and restart sequence in the
case of latch mode protection. When the protection is
triggered, main and auxiliary powers shut down together and
Vcc continues being charged and discharged until Vcc is
fully discharged. The protection is reset when Vcc is
discharged below 6V by unplugging the AC line. Figure 14
shows the remote ON/OFF of the main power. The remote
ON/OFF of the main power is easily implemented using a
transistor connected to the cathode of KA431 in the main
power feedback network as shown in Figure 10. When the
transistor is turned on, the current through the opto-coupler
increases pulling down the feedback voltage to almost zero.
The main starts up with soft-start when the transistor is
turned off.
Figure 10. Remote ON/OFF of Main power
V
FB
Vds
0.50V
0.70V
Ids
Vo
Vo
set
time
Main Output
Aux Output
Main Off
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