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參數(shù)資料
| 型號(hào)： | AN8022L |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | AC-DC switching power supply control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | AN8022L |
Voltage Regulators
AN8022L, AN8022SB
9
I
Application Notes (continued)
[2] Operation descriptions (continued)
3. Overvoltage protection circuit (OVP) (continued)
(to V
CC
)
0 V
IC output
(to 5 V)
0 V
Triangular wave oscillation
(to 7.1 V)
(
IC stop state
)
(
IC stop state
)
(
IC stop state
)
0 V
Internal reference voltage
(to 6 V)
0 V
TIM/OVP terminal voltage
Time
Time
Time
Time
(to 2 V)
V
TH
OVP
Figure 2. Explanation of OVP operation
Figure 3
Abnormal voltage applied from outside
Power supply output
Load
It detects abnormal voltage applied from the outside to the
power supply output (the voltage which is higher than voltage
of the power supply output and may damage the load) by the
primary side of the bias coil and operates the OVP.
GND
Start resistor
R1
V
CC
OVP
V
OUT
After AC rectification
FRD
Operating supply current characteristics
While the OVP is operating, the decrease of the supply current causes the rise of the supply voltage V
CC
, and
in the worst case, the guaranteed breakdown voltage of the IC (35 V) can be exceeded. In order to prevent the rise
of supply voltage, the IC is provided with such characteristics as the supply current rises in the constant resistance
mode. This characteristics ensure that the OVP can not be released unless the AC input is cut, if the supply voltage
V
CC
under OVP operation is stabilized over the OVP release supply voltage (which depends on start resistor
selection). (Refer to figure 4.)
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|---|---|
| AN8022SB | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:AC-DC switching power supply control IC |
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| AN-8024 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Power Switch (FPSTM) FSBH-series to Standby Auxiliary Power Supply |
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