Transcription of AN149 Modeling and Loop Compensation Design …
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AN149 Modeling and Loop Compensation Design …
Application Note 149AN149-1an149faJanuary 2015 IdentIfyIng the ProblemA well-designed switching mode power supply (SMPS) must be quiet, both electrically and acoustically. An under-compensated system may result in unstable operations. Typical symptoms of an unstable power supply include: audible noise from the magnetic components or ceramic capacitors, jittering in the switching waveforms, oscillation of output voltage, overheating of power FETs and so on. However, there are many reasons that can cause undesir-able oscillation other than loop stability.
A N 149 AN149-5 an149fa By applying this two-step modeling technique to a buck converter, as shown in Figure 8, the buck converter power stage can be modeled as simple voltage source, dˆ • VIN, followed by an L/C 2nd-order filter network. Based on the linear circuit in Figure 8, since the control
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