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參數(shù)資料
| 型號： | AN8031 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Active filter control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 205K |
| 代理商： | AN8031 |
15
Voltage Regulators
AN8031
I
Application Notes (continued)
[2] Operation descriptions (continued)
2. Protection circuit (continued)
2) Overvoltage protection
(1) Cause of overvoltage
In the booster chopper circuit, control is carried out so that the input power becomes zero when the
load current reaches zero. However, in the actual condition, the input power can not be decreased to zero.
The output voltage is brought to out of control state, so that it rises.
The cause of the out-of-control condition is that there is a delay time from the turn-on to the turn-off
of the switching device, so that the control to stop the operation of switching device becomes impossible.
(Refer to figure 10.)
In order to prevent the occurrence of such problem, the AN8031 has the built-in overvoltage protec-
tion circuit, so that the number of component to be added to the external part is drastically reduced.
Under light load
Multiplier output
Power MOS
on-time current
Figure 10. Explanation of operation
AN8031
Input voltage
Power MOS off-time current
SBD
Power MOS on-time current
Output voltage
Time
0 A
Time
Power MOS
off-time current
Power MOS
on-time current
Under light load
Multiplier output
Under no load condition, this voltage decreases to around 0 V.
At this time, the frequency of power MOS current rises,
however, there is circuit delay, so that the current does not reach 0 A.
0 A
Power MOS
off-time current
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