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參數(shù)資料
| 型號(hào)： | AN8026 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 125K |
| 代理商： | AN8026 |
10
AN8026
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
7. Overvoltage protection circuit (OVP) (continued)
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 that 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 operating has been stabilized over the OVP release supply voltage (which depends
on start resistor selection). (Refer to figure 9.)
Figure 8
Abnormal voltage applied
from outside
Power supply
output
Load
GND
Start resistor
R1
V
CC
OVP
V
OUT
After AC rectification
FRD
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.
Figure 9
I
CC
V
CC
V
CC
OVP
V
CC
V
OUT
GND
After AC rectification
Start resistor
R1
The current supply from the start resistor continues
as long as the voltage of the power supply input (AC)
is given.
After OVP starts operation, since the output is
stopped, this bias coil does not supply current.
* Select the resistance value so that the following
relationship can be kept by current supply from
the start resistor: V
CC
>
V
CC
OVP
At V
CC
OVP
(voltage under which OVP is released)
as the boundary, the operating current is temporarily
increased.
This prevents V
CC
from exceeding the break down
voltage due to the current supplied from the above
start resistor.
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| AN8029 | 制造商:Panasonic Industrial Company 功能描述:IC PANASONIC |
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