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Digital Control of Single-Inductor Dual-Output DC-DC Converters in Continuous-Conduction Mode

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3 Author(s)
Trevisan, D. ; DIEGM, Udine Univ. ; Mattavelli, P. ; Tenti, P.

This paper investigates the application of digital control for non-isolated single-inductor dual-output step-down dc-dc converters operating in continuous-conduction mode (CCM). The accurate and independent control of each output requires sophisticated digital control architecture so as to minimize cross-regulation problem. The adopted control includes a separate regulation of common-mode and differential-mode output voltages. Moreover, variable gain of the differential-mode regulator and a non-linear evaluation of the common-mode voltage have been investigated in order to improve the system dynamic response at different load conditions. Experimental investigation has been performed using discrete components, implementing the digital control in a field programmable gate array (FPGA). Simulation and experimental results on dual output converters (Vin =2.5/5 V, Vo1=Vo2=0.9/1.5 V, Io1=Io2=0/0.6 A) confirm the proposed analysis

Published in:

Power Electronics Specialists Conference, 2005. PESC '05. IEEE 36th

Date of Conference:

16-16 June 2005