Question regarding Constant Current Modeling of Buck

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SUMMARY

The discussion centers on the transfer function of a parallel RC circuit with equivalent series resistance (ESR) when driven by a current source. The original poster references application note AN149fa from Linear Technology, specifically page 11, which claims the circuit exhibits a 1-pole transfer function. However, the poster's calculations indicate the presence of both a pole and a zero, leading to confusion regarding the correct interpretation of the circuit's behavior.

PREREQUISITES
  • Understanding of transfer functions in electrical engineering
  • Familiarity with parallel RC circuits and their characteristics
  • Knowledge of equivalent series resistance (ESR) concepts
  • Basic proficiency in circuit analysis techniques
NEXT STEPS
  • Review the transfer function derivation for parallel RC circuits with ESR
  • Study the application note AN149fa from Linear Technology in detail
  • Explore the implications of poles and zeros in circuit design
  • Learn about current source behavior in linear circuits
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Electrical engineers, circuit designers, and students studying control systems or circuit analysis who are interested in understanding the dynamics of parallel RC circuits and their transfer functions.

Dextrine
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Hello everyone,

I was reading this application note and I am having trouble understanding how a parallel RC circuit with ESR bring driven by a current source has a transfer function of 1-pole. When I do my math I get a pole and a zero.

I have attached an image of the claim that there's 1-pole as well as the link to the AN.

Thank you all very much.

http://cds.linear.com/docs/en/application-note/AN149fa.pdf (Page. 11)
 

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can you provide us with more info. what did you get for a transfer function. what did they get...
 

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