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Loop Compensation of MIC2204

Loop Compensation of MIC2204. Behzad Mohtashemi EE 136 Power Electronics Professor Zhou Ph.D. WHAT IS MIC 2204?. It is a high-efficiency 2MHz Synchronous Buck Converter. >95% efficiency Input voltage range: 2.3V to 5.5V Output down to 1V/600mA

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Loop Compensation of MIC2204

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  1. Loop Compensation of MIC2204 Behzad Mohtashemi EE 136 Power Electronics Professor Zhou Ph.D.

  2. WHAT IS MIC 2204? • It is a high-efficiency 2MHz Synchronous Buck Converter. >95% efficiency • Input voltage range: 2.3V to 5.5V • Output down to 1V/600mA • It has ultra-fast transient response (typical 200kHz GBW) • Internal Compensation • All ceramic capacitors ( No ESR ). difficult to compensate

  3. MIC2204 Block Diagram

  4. Stable_Unstable_System

  5. How to Make an Unstable System, Stable.

  6. Problems of Making a Voltage_Mode_Buck_Converter Stable

  7. Remedies • Close the loop before the resonant frequency, but this will result in a very slow transient response. • Use an output capacitor with a small ESR, such Y5_ceramic capacitors. • Add zeroes into your loop system, by using typeII and typeIII amplifiers. • MIC2204 uses a zero amplifier to introduce the final zero into the system. The first pole and zero come from the error amplifier itself.

  8. Whenever two different paths will lead to the same point, then we will have zeroes.

  9. Compensation Configuration in MIC2204

  10. Structure of Error Amplifier

  11. Zero Amplifier • It is simple unity gain amplifier • It only needs to create an alternate path to the output • It needs no internal compensations • By creating an alternate path, then it will boost both gain and phase

  12. Overall Stability

  13. Overall Stability

  14. References H. Dean Venable, The K factor: A new mathematical tool for stability analysis and synthesis, Powercon, 10 , H1-H12 (1983) Thomas V. Papathomos, On the stability of peak current-controlled converters: Analysis, simulation, and experiments, IEEE Transaction on Industrial Electronics, IE-33(2), 176-184 (1986) J. Kassakian, M. Schlecht, and G. Verghese, Principles of Power Electronics. Reading, MA: Addison Wesley, 1992

  15. Overall Stability

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