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參數(shù)資料
| 型號： | AN8029 |
| 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> | 132K |
| 代理商： | AN8029 |
5
Voltage Regulators
AN8029
I
Terminal Equivalent Circuits (continued)
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 output
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 volt-
age of the OVP, the OVP works so that the IC
could keep the operation stop condition.
I
9
FB:
Terminal for connecting the photocoupler for er-
ror voltage feedback of the power supply output.
It is possible to cancel about 180 mA of the dark
current of photocoupler.
I
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 sup-
ply voltage reaches the start voltage through
the current from start resistance, the IC starts
operation. Then the power MOSFET driving
starts. Thereby, bias is generated in the trans-
former and the supply voltage is given from
the bias coil to the IC. (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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