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參數(shù)資料
| 型號(hào)： | AN8028 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 133K |
| 代理商： | AN8028 |
5
Voltage Regulators
AN8028
Pin No.
Equivalent circuit
Description
I/O
8
TIM/OVP:
Terminal for use both OVP (overvoltage protec-
tion circuit) and timer latch.
[OVP]
When overvoltage signal of the power supply is
detected and high is inputted to the terminal, it
turns off the internal circuit. At the same time, it
holds that condition (latch). To reset the OVP
latch, the V
CC
should be decreased to a voltage
lower than the release voltage.
[Timer latch]
It detects the output voltage fall due to the
overcurrent condition of the power supply out-
put through the current level inputted to IFB.
When the I
IFB
decreases under the current of
certain value, the charge current flows in the
capacitor which is connected to this terminal.
Then, when the capacitor is charged up to the
threshold voltage of the OVP, the OVP works so
that the IC could keep the operation stop condi-
tion.
I
9
FB:
Terminal for connecting the photocoupler for
error voltage feedback of the power supply out-
put.
It is possible to cancel about 180
μ
A of the dark
current of photocoupler.
I
I
Terminal Equivalent Circuits (continued)
5
μ
A
7.3 V
Comp.
8
V
CC
TON
9
V
CC
I
Application Notes
[1] Operation descriptions
1. Start/stop circuit block
Start mechanism
When AC voltage is applied and the supply
voltage reaches the start voltage through the
current from 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
capacitor (C8) connected to V
CC
.
Start
voltage
Stop
voltage
a
b
Start condition
Start failure
c
Voltage supplied
from bias coil
Before start
Start
V
CC
V
OUT
GND
After AC rectification
Figure 1
Start resistance
R1
C8
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