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參數資料
| 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： | 8/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | AN8022L |
AN8022L, AN8022SB
Voltage Regulators
8
I
Application Notes (continued)
[2] Operation descriptions (continued)
2. Oscillation circuit
The PWM is an abbreviation of Pulse Width Modulation. In this IC, a smaller voltage between the voltage level
which is converted from the current input to IFB terminal and dead-time control level which is fixed internally is
compared with the internal triangular oscillation level through PWM comparator, and optimal duty is determined,
and then it is output via output driving stage.
Triangular wave oscillation
The triangular waveform oscillation is performed through constant current charge/constant current
discharge to/from the external capacitor connected to the CT. The ratio of the charge current to the discharge
current is set inside, and the current value is determined by the external resistor connected to the RT terminal.
The RT terminal voltage is determined by the level which is a resistor-divided voltage of the internal
reference voltage (which is determined by Zener diode and V
BE
of NPN transistor, and temperature-
compensated). For this reason, the effect of fluctuation with temperature and dispersion is small. By the use
of a temperature-compensated external resistor, the effect of the fluctuation with temperature and dispersion
on the charge and discharge current value will be reduced further.
Moreover, since the upper/lower voltage level of the triangular wave oscillation is given by the resistor-
divider internal reference voltage, the effect of fluctuation with temperature and dispersion has been
suppressed.
Moreover, since the upper/lower voltage level of the triangular wave oscillation is given by the resistor-
division of internal reference voltage, the effect of fluctuation with temperature and dispersion has been
suppressed.
As described above, the sufficient consideration has been given to the effect of fluctuation with
temperature and dispersion in the design of the triangular wave oscillation frequency.
(Reference calculation of oscillation frequency)
5
6
×
C
T
×
R
T
f
OSC
=
[Hz]
3. Overvoltage protection circuit (OVP)
OVP is an abbreviation of Over Voltage Protection. It refers to a self-diagnosis function, which stops the power
supply to protect the load when the power supply output generates abnormal voltage higher than the normal
output voltage due to failure of the control system or an abnormal voltage applied from the outside (figure 2 and
figure 3).
Basically, it is set to monitor the voltage of supply voltage V
CC
terminal of the IC. Normally, the V
CC
voltage
is supplied from the transformer drive coil. Since this voltage is proportional to the secondary side output voltage,
it still operates even when the secondary side output has over voltage.
1) When the voltage input to the OVP terminal exceeds the threshold voltage (6.0 V typical) as the result of power
supply output abnormality, the protective circuit shuts down the internal reference voltage of the IC to stop all
of the controls and keeps this stop condition.
2) The OVP is released (reset) under the following conditions:
Decreasing the supply voltage (V
CC
<
8.4 V typical: OVP release supply voltage)
The discharge circuit is incorporated so that the electric charge which is charged in the capacitor
connected to the OVP terminal can be discharged with the constant current of 5
μ
A (typical) for the next re-start.
Secondary side output voltage under normal operation V
OUT
×
V
7
V
CC
terminal voltage under normal operation
V
7
=
V
th(OVP)
+
V
Z
V
th(OUT)
: Secondary side output overvoltage threshold
V
th(OVP)
: OVP operation threshold
V
Z
: Zener voltage (external parts of OVP terminal)
V
th(OUT)
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AN8022SB | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:AC-DC switching power supply control IC |
| AN-8023 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Negative Voltage Management |
| AN-8024 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Power Switch (FPSTM) FSBH-series to Standby Auxiliary Power Supply |
| AN8025 | 功能描述:IC REG LDO 2.5V 50MA TO-92 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩(wěn)壓器拓撲結構:正，固定式和可調式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標準）:1.1V @ 1A 穩(wěn)壓器數量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應商設備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| AN8025M | 功能描述:IC REG LDO 2.5V 50MA TO243 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標準）:0.4V @ 300mA 穩(wěn)壓器數量:1 電流 - 輸出:300mA（最小值） 電流 - 限制（最?。?350mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應商設備封裝:SC-59-3 包裝:Digi-Reel® 產品目錄頁面:1134 (CN2011-ZH PDF) 其它名稱:AP130-30WLDIDKR |
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