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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)： | 11/21頁 |
| 文件大小： | 205K |
| 代理商： | AN8031 |
11
Voltage Regulators
AN8031
I
Application Notes (continued)
[2] Operation descriptions (continued)
1. Normal control (continued)
3) Description of each function (continued)
(1)
V
B
(continued)
<Setting the V
B
terminal constant> (continued)
Zero-cross switching
Zero-cross switching can be realized by using
the local resonance when turning off the power
MOSFET in order to suppress the loss.
By connecting the resonance capacitor C
P
be-
tween the drain and source of the power MOSFET,
and using the inductance of the transformer's pri-
mary side L
P
, the resonance is produced after dis-
charging the accumulated energy of the transformer.
The capacitor for delay should be connected to the
V
B
terminal so that the next turn-on could occur at
the time when the resonance occurred and the drain
voltage of the power MOSFET has reached around
0 V.
However, it is necessary to take care that the
zero-cross conditions could deviate since the delay
amount varies depending on the conditions such as
the input voltage.
(2)
CS
The terminal for detecting the current when the power MOSFET is turned on.
The current flow when the power MOSFET is turned on is equivalent to the current flow in the
inductor. Therefore, the necessary power value can be controlled by controlling the peak value of the
above current.
The input D-range of this terminal is from 0 V to 5 V. However, since dissipation becomes larger if
the power MOSFET current detecting resistance is set at larger value. A value from 0.22
to 0.47
is
the standard considering the relationship with the S/N.
The charge and discharge current to and from the parasitic capacitance of the power MOSFET,
transformer or printed circuit wiring flow in the power MOSFET detection resistor at turning-on and off.
Since such current generates noise and causes malfunction, it is necessary to incorporate a filter to re-
move such irregular element.
AN8031
Resonance capacitor
Delay capacitor
L
P
R
B
A
B
V
OUT
V
B
C
B
C
P
Delay
Power MOSFET
Power MOSFET
Off
On
Resonance by
L
P
C
P
Zero-cross
switching
V
BTH
0 V
B-point voltage
0 V
A-point voltage
Figure 6. CS terminal explanation
I
CS
V
B
Filter
Parasitic
capacitance
Spike
0 A
Spike
(3)
MPI
The MPI is the terminal for monitoring the AC input voltage. The voltage which is resistance-divided
input voltage after full-wave rectification is input. The input D-range of the multiplier is from 0 V to 4.5
V typical and output D-range is from 0 V to 5.4 V typical.
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