參數(shù)資料
型號(hào)： TL2843PE4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDIP8
封裝： ROHS COMPLIANT, PLASTIC, DIP-8
文件頁(yè)數(shù)： 2/23頁(yè)
文件大?。?/td> 620K
代理商： TL2843PE4
TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G JANUARY 1989 REVISED FEBRUARY 2008
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown technique
The PWM controller (see Figure 7) can be shut down by two methods: either raise the voltage at ISENSE above
1 V or pull the COMP terminal 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
remains low until the next clock cycle after the shutdown condition at the COMP or ISENSE terminal is removed.
In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling
VCC below the lower UVLO threshold. At this point, the reference turns off, allowing the SCR to reset.
330
1 k
500
To Current-Sense
Resistor
REF
ISENSE
Shutdown
COMP
Figure 7. Shutdown Techniques
A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope
compensation for converters requiring duty cycles over 50% (see Figure 8). Note that capacitor C forms a filter
with R2 to suppress the leading-edge switch spikes.
RT
0.1
F
CT
R1
R2
ISENSE
RSENSE
C
REF
RT/CT
ISENSE
Figure 8. Slope Compensation
相關(guān)PDF資料
PDF描述
TL3845DRE4-8 1 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TL2844 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-MODE PWM CONTROLLERS
TL2844B 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
TL2844BD 功能描述:電流型 PWM 控制器 Hi-Perf Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TL2844BD-8 功能描述:電流型 PWM 控制器 Hi-Perf Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TL2844BDG4 功能描述:電流型 PWM 控制器 Hi-Perf Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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