参数资料
型号: TL3843BDRG4-8
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: 1 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8
封装: GREEN, PLASTIC, SOIC-8
文件页数: 5/27页
文件大小: 625K
代理商: TL3843BDRG4-8
www.ti.com
Shutdown Technique
330
1 k
500
To Current-Sense
Resistor
Shutdown
COMP
VREF
ISENSE
RT
0.1
F
CT
R1
R2
ISENSE
RSENSE
C
VREF
RT/CT
ISENSE
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
APPLICATION INFORMATION (continued)
The PWM controller (see Figure 5) 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.
Figure 5. 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 6). Note that capacitor C forms a filter
with R2 to suppress the leading-edge switch spikes.
Figure 6. Slope Compensation
13
相关PDF资料
PDF描述
TL2842BDRG4-8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
TL2845BDG4 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
TL2844BD 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
TL2844BDRG4-8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
TL2844BDR-8 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
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TL3843BPE4 功能描述:电流型 PWM 控制器 Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
TL3843D 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
TL3843D-8 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
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