开关电源的Pspice仿真ON Semiconductor

简介：

问：how to make a modle of power MOSFET with 700v breakdown voltage ??
答： I don"t advise you to make it yourself.  You can download from vendor"s website.

问：Pspice仿真是否需要用指定的器件，因为各个厂家生产的东西特性是不同的？
答： No, it is not necessary to use the dedicated components. Mostly, the syntax of the model statement may make some trouble on including it. You can refer to some books that talking about SPICE to help you.

问：如何构造2路或多路输出的变压器？
答： 1.  Standard way to do it by adding windings with individual K-factor ;
2.  Within ON, we have another way to do it, that can give more precise simulation result and also easier to handle, for full details, please refer to Christoph

问：假如输入电压很低(3.3V-12V),又需要隔离时,可使用贵公司哪类元件?
答： e.g. mc34063...

问：你好，吴先生，很高兴你回答我的问题，能否介绍一下关于低压大电流开关电源纹波和噪声的测试方法
答： On practical measurement, for those low voltage, high current, you can use the low voltage impedance probe. This is more accurate. There are some tests like no loading, full loading testing and also the transient test.

问：pspice 对于仿真不同负载，与应用到实际中之间的差异存在一定的出入，请问如何减小两者之间的差异？
答： Decrease the difference about the real circuit and simulation result. The main problems is setting the parameter is not same as the real system.

问：在设计电源的过程中用pspic仿真电路，需要注意哪些基本问题
答： Like selection of gnd, and those source.

For pspice, you need to use the gnd with a "0" symbol. This is for pspice.

And for the source, for ac analysis, you need to use the Vac source...

问：ocp功能如何实现？漏感存在以及耦合不紧密都会造成ocp无法实现
答： Normally, when ocp happen, the voltage on the winding drops, then it cannot maintain above the UVLO, then the current protection works.
Yes, i agree with you in some extent. When the transformer is not coupled well, due to the leakage spike, the aux. w

问：能否介绍一下变压器的建模？
答： If you want to simulation the transformer , you must know the primary inductor value and secondary inductor and using the K factor connect the two wire. you can change the coupling factor K .e.g 0.99 for simulation it. Detail you can  see the pre

问：请问可以对半桥模型，推挽模型，及全桥模型进行仿真吗？贵公司推出的以上常用芯片有哪些？
答： Yes, we have many controllers to serve such application, please go to our web-site to see products.