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參數(shù)資料
| 型號： | AN8038S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws |
| 中文描述： | 2 A SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 0.225 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大小： | 179K |
| 代理商： | AN8038S |
AN8038, AN8038S
Voltage Regulators
16
I
Application Notes (continued)
[2] Operation descriptions (continued)
4. Power supply output control system (IFB: feedback)
Constant-voltage control of the power supply output is conducted by changing the on- and off-periods of the
power MOSFET. On- and off-periods are controlled as follows: a feedback current responding to the output of
output-voltage detection circuit formed at secondary output side is input to IFB pin through a photocoupler
connected to IFB pin (pin 14), and is converted to V
FB
voltage. (See figure 6.)
The more AC input voltage becomes higher and/or the more the load current decreases, the more the flowout
current from IFB pin increases. This makes V
FB
voltage higher and on-period shorter (at the standby, off-period
becomes longer). Furthermore cancellation ability is about 250
μ
A for the dark current of photocoupler.
PC
PC
5 : 1
250
μ
A typ.
7 V
V
FB
20 k
This transistor
discharges the soft
start capacitance
when the IC stops.
At least 1 mA is
required (to bias the
AN1431T/M.)
Secondary side
power supply output
Secondary side
Primary side
4
I
AN1431T/M
Figure 6. Power supply output control system
Figure 7. Feedback current vs.
V
FB
characteristics
0
0.2
1.2
I
IFB
(mA)
0.4
0.6
0.8
1.0
V
F
0
1
2
3
4
5
Dark current
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