作者:admin 日期:2024-01-25 06:06:13 浏览:171 分类:资讯
电容器并联:在某些情况下,可以通过将多个电容器并联来降低整体的esr,从而减少对电路性能的影响。
第一的零点一般取在带宽的1/5左右,这样在带宽处提升相位78度左右,此零点越低,相位提升越明显,但太低了就降低了低频增益,使输出调整率降低,此处我们取6K。
做电源的输出电容用,电容ESR提供一个零点做反馈环路的补偿,有些电源对ESR大小范围有要求,超过范围的电容会导致环路震荡。
请你注意一下,为什么两个输出都增加了0.8V,可能是你测量时接地的表笔测量点离这两个芯片的地脚有点远,某种原因让这段距离的地线有了0.8V的压降,测量时就叠加上去了,你应在芯片引脚附近测。
但是到了整流部分就分开了,并且3V整流前就又经过一个磁性元件,包括后面的储能滤波电感都是不一样的,而且3V还多了反馈电路能更稳定输出,基本上3V也可以看成是独立的。
对于一些模拟设备,直接用3V驱动5V最多也就是亮度不够,功率低一些而已。但是对于数字设备就可能造成电平不匹配,导致有时候能工作,有时候不行,或者工作的不正常。这就需要5V和3V的电平转换模块来实现。
V的是运放的工作电压,3V是DSP的工作电压(如DSP281DSP2407等,可以看下相关资料),不是同一个电源,但一般板上的3V由5V经专用芯片转换得到。两个电源不要直接接,不然会有环流,对电路不好。
检查一下12V输出线有没有断;电源内部12V输出绕组电压有没有:绕组后面的整流管输出电压有没有。结果就应该出来了。
ls14有两个关键的参数:输入电压范围;输出电压范围。通常输出电压和供电电压差不多,与输入电压没有关系。只要你的输入信号满足74ls14工作的输入电压大小,它就能稳定输出5v或者0v。
高分子的钽电容(钽聚合物电解电容器)耐高温,滤高频改波性能极好,等效串联电阻(ESR)非常低,价格也相对较高,但相比固态铝电解电容来说体积要小得多,在高度集成或是工作条件恶劣的电路中是不二的选择。
钽电容的ESR相比铝电解要小很多。对于线性电源来说,其纹波频率较低,用铝电解比较合适,因为它的容量和成本比小,且足够满足滤波要求。
因为钽电容的等效串联阻值小,滤波选钽电容更好些,体积小 要求高 价格贵的产品使用钽电,否则选择铝电。
因为用处不同,能够达到的效果不同。不过你要说 稳定性 ,钽电容最好,因为它是 固态 金属 电容,里面不含 电解液 ,也就是说不会失效。电解电容 则是一直处于 化学反应 中,所以时间长了电解电容会失效。
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