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參數(shù)資料
| 型號： | AN8022L |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | AC-DC switching power supply control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | AN8022L |
Voltage Regulators
AN8022L, AN8022SB
7
I
Application Notes (continued)
[1] Main characteristics [Load: C
L
=
3 300 pF, R
L
=
20
] (continued)
OVP operating bias current characteristics 1
OVP operating bias current characteristics 2
2.5
-50
-25
100
Ambient temperature (
°
C)
B
3.0
3.5
4.0
4.5
0
25
50
75
V
CC
=
20 V
0.5
-50
-25
100
Ambient temperature (
°
C)
B
1.0
1.5
2.0
2.5
0
25
50
75
V
CC
=
10 V
[2] Operation descriptions
1. Start/stop circuit block
Start mechanism
When AC voltage is applied and the supply
voltage reaches the start voltage through the cur-
rent from the start resistor, the IC starts opera-
tion. Then the power MOSFET driving starts.
Thereby, bias is generated in the transformer
and the supply voltage is given from the bias
coil to the IC. (This is point a in figure 1.)
During the period from the time when the
start voltage is reached and the voltage is gen-
erated in the bias coil to the time when the IC is
provided with a sufficient supply voltage, the
supply voltage of the IC is supplied by the ca-
pacitor (C1) connected to V
CC
.
Since the supply voltage continuously de-
creases during the above period (area b in figure
1), the power supply is not able to start (state c
in figure 1), if the stop voltage of the IC is
reached before the sufficient supply voltage is
supplied from the bias coil.
Function
The start/stop circuit block is provided with the function to monitor the V
CC
voltage, and to start the operation
of IC when V
CC
voltage reaches the start voltage (14.2 V typical), and to stop when it decreases under the stop
voltage (9.2 V typical). A large voltage difference is set between start and stop (5.0 V typical), so that it is easier
to select the start resistor and the capacitor to be connected to V
CC
.
Note) To start up the IC operation, the startup current which is a pre-start current plus a circuit drive current is necessary.
Set the resistance value so as to supply a startup current of 450
μ
A.
Start voltage
After AC rectification
Start resistance
Stop voltage
a
b
Start condition
Start failure
c
Voltage supplied
from bias coil
Before start
Start
Figure 1
V
OUT
R1
V
CC
GND
C1
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|---|---|
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