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参数资料
| 型号： | FA5305AS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 16/17页 |
| 文件大小： | 280K |
| 代理商： | FA5305AS |
8
FA5304AP(S)/FA5305AP(S)
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 FA5304A with respect to
ground as shown in Figure 15.
The drain current of the MOSFET is converted to voltage by
resistor R7 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 PWM
comparator 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 FA5304A
Fig. 15 Overcurrent limiting circuit for FA5304A
相关PDF资料 |
PDF描述 |
|---|---|
| FA5304AS | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA5305AP | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDIP8 |
| FA5304AP | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDIP8 |
| FA5314S | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| FA5310BP | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDIP8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FA531 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FA531硅NPN型超高频大功率晶体管 |
| FA5310 | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:Bipolar IC For Switching Power Supply Control |
| FA5310BP | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:Bipolar IC For Switching Power Supply Control |
| FA5310BP(S) | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| FA5310BPS | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:Bipolar IC For Switching Power Supply Control |
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