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High Performance BCD Integrated Buck-Boost Converter in an AMOLED Display with Application of Self-Triggering Frequency ModulationKIM, H. , JEON, S. , CHOI, H. , KIM, N.
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DC-DC power converters, CMOS integrated circuits, voltage-controlled oscillators, frequency modulation, pulse width modulation
display(10), power(8), electronics(8), amoled(8), current(7), converter(6), circuits(5), buck(5), mode(4), letters(4)
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About this article
Date of Publication: 2018-08-31
Volume 18, Issue 3, Year 2018, On page(s): 119 - 124
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2018.03016
Web of Science Accession Number: 000442420900016
SCOPUS ID: 85052057831
Feedback control for self-triggering frequency modulation is proposed for an integrated buck-boost DC-DC converter in an AMOLED display. The goal is to reduce the ripple noise and transient time during the switching process. The converter uses two control modes: switching frequency modulation (SFM) mode for light load current and pulse width modulation (PWM) mode for heavy load current, which result in high power efficiency over a wide range of load current. The mode is automatically changed according to the load current and triggering pulse. A ring-type voltage controlled oscillator (VCO) is applied to obtain a proper operating frequency in the feedback control circuit by the load-dependent current source. The set and reset pulses are used to limit the switching-on time in the sensing signals with less transient time. The converter was fabricated with 0.35-m BCD (BIPOLAR-CMOS-DMOS) process technology. An experiment shows that the maximum power efficiency is 90 percent over a wide current range of 10-150 mA. Compared to a conventional converter, the proposed converter shows significantly less ripple noise and transient time.
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