High Performance BCD Integrated Buck-Boost Converter in an AMOLED Display with Application of Self-Triggering Frequency Modulation

• Main Authors: KIM, H., JEON, S., CHOI, H., KIM, N.
• Format: Article
• Language: English
• Published: Stefan cel Mare University of Suceava 2018-08-01
• Series: Advances in Electrical and Computer Engineering
• Subjects: DC-DC power converters; CMOS integrated circuits; voltage-controlled oscillators; frequency modulation; pulse width modulation
• Online Access: http://dx.doi.org/10.4316/AECE.2018.03016

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-µm 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.