Transcription of AN149 Modeling and Loop Compensation Design of …
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AN149 Modeling and Loop Compensation Design of …
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. Unfortunately, they all look the same on the oscilloscope to the inexperienced supply designer.
PoWer StAge A switching mode power supply (SMPS), such as the buck step-down converter in Figure 4, usually has two operating modes, depending on the on/off state of its main control switch. Therefore, the supply is a time-variant, nonlinear system. To analyze and design the compensation with conventional linear control methods, an averaged, small
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