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參數(shù)資料
| 型號： | AN8032 |
| 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)： | 14/21頁 |
| 文件大?。?/td> | 206K |
| 代理商： | AN8032 |
14
AN8032
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
2. Protection circuit
1) Timer
In control of this IC, the chopper circuit does not start unless the first on-signal is input to the switching
device. The chopper circuit does not re-start, if the turn-on timing of switching device is missed due to some
abnormality.
For the above reasons, this IC is incorporating the timer circuit and generating the start pulse once in
every approx. 400
μ
s (typical) when the chopper circuit stops, eliminating the need for an external part to cope
with this problem. (Refer to figure 9.) However, in order to prevent the output rise of the chopper circuit, the
timer circuit does not operate as long as the overvoltage protector is operating.
Figure 9. Explanation of timer operation
When operation start
0 V
Time
0 A
Time
400
μ
s typ.
Input voltage
Timer trigger
signal (signal
inside the IC)
Input voltage applied
operation start
Input voltage
Power MOSFET current
When abnormal stop
Timer trigger
signal (signal
inside the IC)
Abnormal stop
Power MOSFET current
One-shot pulse
Start
0 V
Time
0 A
Time
400
μ
s typ.
One-shot pulse
Timer start
Re-start
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