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參數(shù)資料
| 型號(hào)： | 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)： | 8/28頁 |
| 文件大?。?/td> | 233K |
| 代理商： | KA3511 |
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8
Rev C, November 1999
6. BLOCK DESCRIPTION & APPLICATION INFORMATIONS
6.1 OSCILLATOR BLOCK
Figure 1. Oscillator R
T
, C
T
The KA3511 is a fixed-frequency pulse width modulation control circuit. An internal-linear sawtooth
oscillator is frequency-programmable by two external components, R
T
and C
T
. The oscillator fre-
quency is determined by
Figure 2. Oscillator Frequency vs. Timing Resistance
6.2 PWM CONTROL BLOCK
Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform
across capacitor C
T
to either of two control signals. The NOR gates, which drive output transistors
Q1 and Q2, are enabled only when the flip-flop clock-input line is in its low state. This happens only
during that portion of time when the sawtooth voltage is greater than the control signals. Therefore,
an increase in control-signal amplitude causes a corresponding linear decrease of output pulse
width. (Refer to the timing diagram shown in Figure 4)
Vref
V
CC
C
T
R
T
12
1
12
12
fosc
R
T
C
T
--------------------
=
300K
2K
5K
10K
20K
50K 100K
200K
500K 1M
100K
10K
1K
100
301K
I
O
R
T
. TIMING RESISTANCE(
)
VCC=15V
1.0
μ
F
0.1
μ
F
CT=0.01
μ
F
0.001
μ
F
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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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