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參數資料
| 型號： | FA5317PS |
| 廠商： | FUJI ELECTRIC HOLDINGS CO., LTD. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Bipolar IC For Switching Power Supply Control |
| 中文描述： | 雙極集成電路開關電源控制 |
| 文件頁數： | 7/17頁 |
| 文件大小： | 263K |
| 代理商： | FA5317PS |
7
FA531X series
4.4 Output ON/OFF control
The IC can be turned on and off by an external signal applied
to the CS pin.
Figure 13 shows the external output on/off control circuit, and
Figure 14 is the timing chart.
The IC is turned off if the CS pin voltage falls below 0.42V. The
output of comparator C1 switches high to turn the bias circuit
off. This shuts the output down. The IC then discharges the
MOSFET gates.
The IC turns on if the CS pin is opened for automatic soft start.
The power supply then restarts operation.
5. Overcurrent limiting circuit
The overcurrent limiting circuit detects the peak value of every
drain current pulse of the main switching MOSFET to limit the
overcurrent.
The detection threshold is
+
0.24V for FA5310B/11B/16/17
with respect to ground as shown in Figure 15.
The drain current of the MOSFET is converted to voltage by
resistor R
7
and fed to the IS pin of the IC. If the voltage
exceeds the reference voltage (0.24V) of comparator C4, the
output of comparator C4 goes high to set flip-flop output Q
high. The output is immediately turned off to shut off the
current. Flip-flop output Q is reset on the next cycle by the
output of the oscillator to turn the output on again. This
operation is repeated to limit the overcurrent.
If the overcurrent limiting circuit malfunctions due to noise,
place an RC filter between the IS pin and the MOSFET.
Figure 16 is a timing chart which illustrates current-limiting
operations.
Fig. 13 External output on/off control circuit
Fig. 14 Timing chart for external output on/off control
Fig. 16 Overcurrent timing chart for FA5310/11/16/17
Fig. 15 Overcurrent limiting circuit for FA5310/11/16/17
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相關代理商/技術參數 |
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|---|---|
| FA5317S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| FA531X | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Switching Power Supply Control |
| FA5321P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| FA5331M | 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:Bipolar IC For Power Factor Correction |
| FA5331P | 制造商:Panasonic Industrial Company 功能描述:IC |
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