In order to graph the entire control loop Bode plot, this measurement must be repeated over a large frequency sweep, stopping at fSW/2 (half of the switching frequency of the converter).Figure 2. LT3950 DC2788A demonstration circuit LED driver LTspice model with control loop noise inj...
图4. 用LTspice中的LT3950进行波德图测量,显示增益(实线)和相位(虚线)。 在LTspice中创建全部增益和相位扫描和波德图 要在LTspice中为控制环路创建全部波德图、增益和相位的图形扫描,请按照下列步骤操作。 第1步:创建交流电注入源 在LTspice中,插入±10 mV AC注入电压源和注入电阻,并标记节点A,B和C,如图2所...
The step is used in control systems, where you want to see how the system behaves in response to a change (transient) and in its steady-state (DC).If you apply a sweep to a system, and record both sampled input and output, to obtain a bode plot there are at least two ways. The ...
LTspice is a high performance SPICE simulator that simplifies the design of switching regulators. The software is provided free by Analog Devices. LTspice includes a library of basic models for a limited number of Coilcraft inductor models. These models are included in the standard inductor library...
To select a value from the series right click on the inductor to open the Component Attribute Editor window Triple clickon the SpiceModel value which is “Coilcraft_Inductor” by default to get the dropdown menu of available values Once the value is selected and the inductor is placed in you...
In this article, an LTspice model of a hypothetical ADxxxx device will be used to create an IBIS model. It is a single-input and single-output digital buffer with an enable pin. Thus, the resulting IBIS model will have two inputs (DIN1 and EN) and a three-s...
This mini tutorial covers the basics of power supply design by giving an overview of the most common topologies and showing how to use simulation design tools such as LTpowerCAD and LTspice.
LTspice based on Middlebrook’s original recommendation in 1975 is well documented (see “LTspice: Basic Steps in Generating a Bode Plot of SMPS”).1The actual signal injection location laid out in Middlebrook’s method is not commonly used these days but has been adjusted over ...
In this article, an LTspice model of a hypothetical ADxxxx device will be used to create an IBIS model. It is a single-input and single-output digital buffer with an enable pin. Thus, the resulting IBIS model will have two inputs (DIN1 and EN) and a three-state out...