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Nonuniform A/D Quantization for ImprovedDynamic Responses of Digitally ControlledDC–DC Converters

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3 Author(s)
Haitao Hu ; ECE Dept., Univ. of Colorado, Boulder, CO ; Yousefzadeh, V. ; Maksimovic, D.

This paper presents an approach to improve dynamic responses of digitally controlled DC-DC converters using nonuniform analog-to-digital (A/D) quantization of the output voltage error. The nonuniform A/D quantizer parameters are selected to achieve improved step-load transient responses without compromising stability margins. The implementation, which includes a programmable A/D quantizer and a look-up table based discrete-time compensator, is simple and well suited for practical high-frequency digital pulsewidth modulation controllers. Simulation and experimental results are presented for a proof-of-concept point-of-load 5 V-to-1.3 V digitally controlled synchronous buck converter.

Published in:

Power Electronics, IEEE Transactions on  (Volume:23 ,  Issue: 4 )

Date of Publication:

July 2008

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