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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)： | 12/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | AN8022L |
AN8022L, AN8022SB
Voltage Regulators
12
I
Application Notes (continued)
[2] Operation descriptions (continued)
5. Soft start (continued)
On the other hand, the V
FB
has high voltage because the power supply output is low. And, the V
DTC
is positioned
at the medium voltage of the triangular wave oscillation waveform as constant voltage. Therefore, at operation
starting, the V
SS
is input to the PWM comparator as the lowest voltage and is compared with the triangular wave
oscillation waveform.
As the result, the output of the IC generates the pulse of duty which gradually becomes large with the rise of
V
SS
from the minimum duty. (Refer to figure 7.)
However, when the V
SS
exceeds the V
FB
or V
DTC
, the duty of the output pulse depends on the V
FB
or V
DTC
.
The soft start function works only up to that point and after that the normal control comes.
V
SS
V
DTC
V
FB
0 V
V
CT
V
SS
V
FB
V
DTC
V
OUT
V
FB
V
CT
Figure 7. Soft start operation waveform
6. Timer latch
When the short-circuit or overload of the power supply output continues for a certain period, the pulse-by-pulse
overcurrent protection is not sufficient for protection of the transformer, Fast Recovery Diode (FRD), Schottky
Diode in the secondary side and the power MOSFET. For this reason, the timer latch function is employed, which
stops the power supply by hitting the OVP, when the overcurrent condition continues for a certain period.
The short-circuit or overload of the power supply output is monitored as the decrease of the power supply output
(at this time the pulse-by-pulse overcurrent protector is in the operating condition). The decrease of the power
supply output is detected as the decrease of current amount from the current feedback terminal of the normal
PWM control. When the decrease amount of this current exceeds a certain value, the comparator inside the IC
reverses to flow the constant current to the TIM/OVP terminal.
The external capacitor is connected to the TIM/OVP terminal. Electric charges are accumulated in this capacitor
to rise the OVP terminal voltage. When the OVP operating threshold voltage (6 V typical) is reached, the OVP starts
operation to stop the IC and keeps this stop condition. (Refer to Figure 8.)
Timer period
The period from the time when an error of the power supply output is detected to the time when the OVP starts
operation (hereinafter referred to as timer period) should be longer than the rise time of the power supply. Since
at operation start the IC is in the same condition as the overload or output short-circuit condition, if the timer
period is shorter, the power supply works latch and can not start.
Therefore, the IC is designed so that the timer period can be set to any desired value with capacitance value of
the external capacitor connected to the TIM/OVP terminal. However, particular care should be taken, because too
large value of this capacitance may cause the breakdown of the power supply.
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相關(guān)代理商/技術(shù)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(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)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(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)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(yīng)商設(shè)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(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）: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(yīng)商設(shè)備封裝:SC-59-3 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1134 (CN2011-ZH PDF) 其它名稱:AP130-30WLDIDKR |
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