参数资料
| 型号： | KA3842BD |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 14-SOP |
| 标准包装： | 4,860 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 100% |
| 电源电压： | 10 V ~ 30 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
KA3842B/KA3843B/KA3844B/KA3845B
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 V CC 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 T , 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)
7
相关PDF资料 |
PDF描述 |
|---|---|
| KA3883C | IC CTRLR PWM SMPS UVLO 8DIP |
| KA431LZTA_F065 | IC VREF SHUNT ADJ TO-92-3 |
| KA431SAMFTF_G | IC VREF SHUNT ADJ SOT-23F |
| KA431ZTA | IC VREF SHUNT ADJ TO-92-3 |
| KA5L0365RYDTU | IC SWIT PWM CM OVP UVLO HV TO220 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| KA3842BDTF | 功能描述:电流型 PWM 控制器 SMPS 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 |
| KA3843 | 制造商:ESTEK 制造商全称:ESTEK 功能描述:fixed frequency current mode PWM controller |
| KA3843A | 制造商:WINGS 制造商全称:Wing Shing Computer Components 功能描述:Current���� Mode��PWM��Cont roller |
| KA3843AC | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:SMPS Controller |
| KA3843ACD | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:SMPS Controller |
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