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参数资料
| 型号： | FA5500P |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 18/26页 |
| 文件大小： | 305K |
| 代理商： | FA5500P |
FA5500P/N, FA5501P/N
25
Quality is our message
ON/OFF
signal
R16
R17
2
COMP
Q3
C3
Fig.34
ON/OFF control circuit (1)
If the discharging current of capacitor C3 should be
limited, connect a resistor R19 as shown in Fig. 35.
The value of R19 should be selected 1k or smaller.
In addition, check that COMP pin voltage is lowered
below 1V.
R19
ON/OFF
signal
R16
R17
2
COMP
Q3
C3
Fig.35
ON/OFF control circuit (2)
When lowering COMP pin voltage, in addition to the
output current of error amplifier, current, which flows
voltage divider connected FB pin, appears at COMP
pin through diode connected between input and output
of error amplifier. When designing and evaluating the
circuit, consider this current sufficiently, too. (See 10.
Description of Each Circuit (1) Error amplifier)
Do not use “Open/short protection at FB pin” as
ON/OFF control by lowering FB pin voltage. In this case,
there is a possibility of an abnormal rise of PFC output
voltage at the turning on and off.
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