Title :
A 1.2A 2MHz tri-mode Buck-Boost LED driver with feed-forward duty cycle correction
Author :
Bang, Sarvesh ; Swank, Damian ; Rao, Arun ; McIntyre, William ; Khan, Qadeer ; Hanumolu, Pavan Kumar
Author_Institution :
Sch. of EECS, Oregon State Univ., Corvallis, OR, USA
Abstract :
A flash LED Buck-Boost driver employs a dual duty cycle control and feed-forward duty cycle correction to achieve high efficiency over the entire Li-On battery voltage range of 3.0 to 5.2V. Fabricated in a 0.5μm CMOS process, the converter uses an external 1μH inductor and a 10μF capacitor and operates at 2MHz switching frequency. The measured peak efficiency is 83% and 87% at 1.2A and 0.6A LED currents, respectively. This achieved efficiency represents an improvement of more than 10% over conventional approaches.
Keywords :
driver circuits; feedforward; light emitting diodes; power convertors; capacitance 10 muF; current 0.6 A; current 1.2 A; dual duty cycle control; efficiency 83 percent; efficiency 87 percent; feed-forward duty cycle correction; frequency 2 MHz; size 0.5 mum; tri-mode buck-boost LED driver; voltage 3.0 V to 5.2 V; Batteries; Converters; Driver circuits; Inductors; Light emitting diodes; Voltage control; Voltage measurement;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2010 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-5758-8
DOI :
10.1109/CICC.2010.5617443
