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參數(shù)資料
| 型號： | AN8021SB |
| 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, PDSO16 |
| 封裝： | 0.225 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 141K |
| 代理商： | AN8021SB |
10
AN8021L, AN8021SB
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
3. Overvoltage protection circuit (OVP) (continued)
Figure
3
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.
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.)
Figure
4
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.
At V
CC-OVP
(voltage under which OVP is released),
the operating current is temporarily increased.
This prevents V
CC
from exceeding its breakdown
voltage through the current from above mentioned.
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
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