an8032 Panasonic Corporation of North America, an8032 Datasheet - Page 17

• Manufacturer Part Number: an8032
• Description: Active Filter Control Ic
• Manufacturer: Panasonic Corporation of North America

Voltage Regulators
[2] Operation descriptions (continued)
2. Protection circuit (continued)
Application Notes (continued)
2) Overvoltage protection (continued)
Operation condition of
active filter
Power MOSFET current
Output voltage of
active filter
(3) Output voltage overshoot at start
Set output voltage
connected to the output is charged. Under this condition the chopper circuit operates with full power.
However, it does not immediately come out of the full-power-operation (due to control delay of the entire
feedback system) even when the proper output voltage is obtained, causing the overshoot of output
voltage.
such as damage of used parts. (Refer to figure 12.)
At operation start, the output overload condition is created because the smoothing capacitor which is
The AN8032 overvoltage protector operates even at operation starts and prevents the worst cases
0 A
0 A
Operation start
Figure 12. Output voltage overshoot when operation starts
Start under output
short-circuit condition
Current peak value is high
Operating
Overvoltage protector operation
Overvoltage
condition
Stop
AN8032
Operating
Time
Time
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