參數(shù)資料
型號(hào)： AN8032
廠商： PANASONIC CORP
元件分類： 模擬信號(hào)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(yè)數(shù)： 16/21頁(yè)
文件大?。?/td> 206K
代理商： AN8032
16
AN8032
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
2. Protection circuit (continued)
2) Overvoltage protection (continued)
(2) Description of overvoltage protector operation
With respect to the AN8032 IC, the input of the error amplifier which detects the output voltage is
provided separately from the input of the overvoltage protection comparator. This is the point which
differs from the AN8031.
Each setting is shown as follows:
Control reference voltage of the error amplifier: 2.50 V typical
Detection voltage of the overvoltage comparator: 2.63 V typical [Without hysteresis]
(Voltage of 5% higher than the control reference voltage of the error amplifier)
If the output voltage becomes more than 5% higher than the normal control voltage at the time of
start up or abnormality occurrence, the overvoltage comparator operates to cut off the switching device.
The timer circuit is cut off when overvoltage is detected. This prevents the output voltage to increase
further. Otherwise, the timer circuit will re-start the power MOSFET, and actuate it to increase the output
voltage further at the time of the overvoltage detection.
Therefore, under no load condition, the output voltage of the chopper circuit is stabilized at the value
which is 5% higher than the normal control voltage and does not exceed that value. (Refer to figure 11.)
The increase/decrease of the output voltage is created by the offset amount of the overvoltage com-
parator.
Figure 11. Protection of overvoltage protection operation
Stop
Time
0 A
420 V
400 V
Stabilized at 5% higher voltage
Created by offset amount
of overvoltage comparator
Output voltage of
active filter
Operation condition
of active filter
Power MOSFET current
Operating
Stop
Operating
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