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參數(shù)資料
| 型號： | KA3511 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PC POWER SUPPLY DESIGN WITH KA3511 |
| 中文描述： | 0.2 A SWITCHING CONTROLLER, 10 kHz SWITCHING FREQ-MAX, PDIP22 |
| 封裝： | 0.400 INCH, DIP-22 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 233K |
| 代理商： | KA3511 |
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16
Rev C, November 1999
6.9 POWER GOOD SIGNAL GENERATOR
Figure 11. PG Signal Generator Block
Power good signal generator curcuits generate “ON & OFF” signal depending on the status of out-
put voltage to prevent the malfunctions of following systems like microprocessor and etc. from
unstable outputs at power on & off. At power on, it produces PG “High” signal after some delay
(about 250ms) for stabilizing outputs.
At power off, it produces PG “Low” signal without delay by sensing the status of power source for
protecting following systems. V
CC
detection point can be calculated by following equation. recom-
mended values of R11, R12 are external components.
COMP3 creates PG “Low” without delay when +5V output falls to less than 4.3V to prevent some
malfunction at transient status, thus it improves system stability.
When remote On/Off signal is high, it generates PG “Low” signal without delay. It means that PG
becomes “Low” before main power is grounded.
PG delay time (Td) is determined by capacitor value, threshold voltage of COMP3 and the charg-
ing current and its equation is as following.
9
10
14
12
11
Vref
R11
60k
R13
Vref
COMP1
V
CC
R12
4.7k
DET
R14
1.25V
COMP2
Remote
ON/OFF
CPG
2.2uF
+
TPG
Q2
COMP3
Q3
PG
PG COMP
Ichg
R15
1k
Vref +5V
0.6V
1.8V
V
DET
1.25V
1
R12
----------
+
×
= 17.2V
=
Td
Ichg
-----------
------------------------
Ichg
≈
18
A
-----------------------------
250ms
≈
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KA3511BS | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Intelligent Voltage Mode PWM IC |
| KA3511DS | 功能描述:電壓模式 PWM 控制器 PWM/ Secondary Combo IC RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| KA3524 | 功能描述:DC/DC 開關(guān)控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| KA3525A | 功能描述:DC/DC 開關(guān)控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| KA3525A | 制造商:Fairchild Semiconductor Corporation 功能描述:CONTROLLER IC 制造商:Fairchild Semiconductor Corporation 功能描述:IC, SMPS CONTROLLER, 16-DIP |
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