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參數資料
| 型號： | KA3844BD |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SMPS Controller |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SOP-14 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 91K |
| 代理商： | KA3844BD |
KA3842B/KA3843B/KA3844B/KA3845B
7
Shutdown of the KA3842B can be accomplished by two methods; either raise pin 3 above 1V or pull pin 1 below a voltage
two diode drops above ground. Either method causes the output of the PWM comparator to be high (refer to block diagram).
The PWM latch is reset dominant so that the output will remain low until the next clock cycle after the shutdown condition at
pins 1 and/or 3 is removed. In one example, an externally latched shutdown may be accomplished by adding an SOR which
will be reset by cycling Voc below the lower UVLO threshold. At this point the reference turns off, allowing the SCR to reset.
Figure 9. Slope Compensation
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope compensation for
converters requiring duty cycles over 50%. Note that capacitor, C, forms a filter with R2 to suppress the leading edge switch
spikes.
TEMPERATURE (
°
C)
Figure 10. TEMPERATURE DRIFT (Vref)
TEMPERATURE (
°
C)
Figure 11. TEMPERATURE DRIFT (Ist)
TEMPERATURE (
°
C)
Figure 12. TEMPERATURE DRIFT (Icc)
相關PDF資料 |
PDF描述 |
|---|---|
| KA3845 | SMPS Controller |
| KA3845B | SMPS Controller |
| KA3845BD | SMPS Controller |
| KA3843AC | SMPS Controller |
| KA3843ACD | RES CHIP 9.10K OHM 1/16W 1% 0402 SMT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| KA3844BDTF | 功能描述:電流型 PWM 控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| KA3845 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:SMPS Controller |
| KA3845B | 功能描述:電流型 PWM 控制器 PWM Control IC RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| KA3845BD | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:SMPS Controller |
| KA3845BDTF | 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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