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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)： | 9/21頁 |
| 文件大?。?/td> | 205K |
| 代理商： | AN8031 |
9
Voltage Regulators
AN8031
I
Application Notes (continued)
[2] Operation descriptions (continued)
1. Normal control (continued)
2) Control outline description (Refer to figure 2 and figure 3.) (continued)
(8) Switching device turn-on
By resonance, the turn-on signal is sent to the switching device, timed with the sub-coil voltage when
it swings from high to low.
(9) Continuation of operation
When the switching device is turned on, current flows in the inductor so that the above operation is
repeated.
<Summary>
When the excitation energy of inductor is lost and the free resonance is started, the switching device turns on.
The switching device will turn off when the following two elements cross each other: The product of the input
voltage (E
IN
) and output one (E
OUT
) of the chopper circuit, and the switching device current.
The fluctuation of input voltage and load current is controlled by changing the peak value height of switching
device current.
The purposes of mixing two signals by using the multiplier are:
to stabilize the control system
to reduce the number of components required
3) Description of each function
(1)
V
B
Function
It detects the discharge of the excitation energy of the inductor (reset operation) and turns on the power
MOSFET at the next cycle.
Method
When the inductor is reset, the sub-coil provided on the inductor (bias winding) starts free resonance.
It is difficult from the view point of withstanding voltage to input this voltage directly to the IC. For this
reason, it is input to the V
B
terminal through resistor.
Function of upper limit voltage clamper
It prevents the damage when the V
B
terminal voltage exceeds the withstanding voltage.
Function of lower limit voltage clamper
It prevents the malfunction when the V
B
terminal voltage swings to negative voltage: generally, in the
case of monolithic IC, malfunction (such as latch-up) occurs when the terminal voltage decreases to a value
below
V
BE
and the parasitic device is activated.
IC inside
The V
B
terminal voltage is input to the comparator with hysteresis inside the IC. For this reason, if the
V
B
terminal voltage is under the threshold value, the power MOSFET is turned on.
However, if the off signal has been given to the power MOSFET by the overvoltage protection func-
tion, this function precedes the former.
Figure
4. V
B
terminal description
0 V
Power MOSFET
V
B
terminal input voltage
V
BTH
(1.5 V typ.)
OFF
ON
OFF
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