- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375327 > AN8022L (PANASONIC CORP) AC-DC switching power supply control IC PDF資料下載
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)： | 11/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | AN8022L |
Voltage Regulators
AN8022L, AN8022SB
11
I
Application Notes (continued)
[2] Operation descriptions (continued)
4. Overcurrent protection circuit (OVP) (continued)
0
Power
MOSFET
current
Time
0
Time
0
Time
V
OUT
Terminal
voltage
Pulse width can not be made
shorter than this width due to delay
Overshoot
due to
delay
Figure 6. Pulse-by-pulse overcurrent detector operation waveform
CLM (
)
Terminal
voltage
V
TH
(
200 mV typ.)
5. Soft start
At start of the power supply, the capacitor connected to the power supply output causes the power supply to
rise under overload condition. Under this condition, the power supply output is low. For the normal PWM control,
attempt is made to limit the current by the pulse-by-pulse over current protection so that the power supply output
could rise at maximum duty. However, pulses can not be made down to zero due to circuit delay. As a result, large
current flows in the mains switch (the power MOSFET) or in the diode in the secondary side, and in the worst case
these parts are damaged.
For this reason, soft start function in which the power supply output does not rise with maximum duty but rise
with gradually widening duty from the minimum one (0%) at the power supply start is adopted.
The use of this function requires more rise time of power supply output. However, it can extend the service
life of parts and raise the reliability of the power supply.
The soft start (SS) terminal is connected to the PWM input (hereinafter its voltage is referred to as V
SS
). In the
PWM, three voltages are input: the voltage to which the current feedback level is converted (hereinafter referred
to as V
FB
), the voltage determining the maximum duty (hereinafter referred to as V
DTC
). This voltage is determined
inside the IC), and the triangular wave oscillation voltage (hereinafter referred to as V
CT
). V
SS
, V
FB
and V
DTC
are
input in the non-reverse input (
+
) of the PWM comparator and V
CT
is input in the reverse input (
). Among the three
signals of the non-reverse input, the lowest one is selected for input to the PWM comparator.
The external capacitor (hereinafter referred to as C
SS
) is connected to the SS terminal. In the pre-start condition,
this capacitor is set to be sufficiently discharged by the transistor inside the IC.
When the supply voltage exceeds the start voltage to start the IC operation, charging is started in the C
SS
by
the constant current source inside the IC. Therefore V
SS
gradually rises from 0 V.
相關PDF資料 |
PDF描述 |
|---|---|
| AN8022SB | AC-DC switching power supply control IC |
| AN8026 | Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
| AN8027 | AC-DC switching power supply control IC with standby mode |
| AN8037 | AC-DC switching power supply control IC with standby mode |
| AN8028 | Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
相關代理商/技術參數(shù) |
參數(shù)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(shù)量:2 電流 - 輸出:1A 電流 - 限制（最小）: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(shù)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。