Design and implementation of a CMOS based low voltage PWM boost converter for driving white LED

• Main Author: Cabrera, Anthony Ramos
• Format: text
• Language: English
• Published: Animo Repository 2010
• Subjects: PWM power converters; CMOS; Pulse frequency modulation; Other Computer Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/3842; https://animorepository.dlsu.edu.ph/context/etd_masteral/article/10680/viewcontent/CDTG004701_P.pdf
• Institution: De La Salle University

The consumer market is increasing its demand for battery-operated portable devices. Due to the high voltage needs of certain circuits, power management circuits such as DC-DC converters have become a huge necessity to regulate the low voltages coming from batteries. One of the DC-DC converters come in the form of pulse width modulation schemes to boost up the voltage from the battery. This research designs a PWM boost converter controller that is capable to work at low voltages (1.2V). The design is based on 0.35um process technology, which is characterized to work at a power supply of 3.0V. Although the process technology is designed at 3.0V, the design works around these limitations to work at 1.2V. The PWM controller also uses a timing driven comparator to limit the complexity behind using feedback operational amplifiers. The PWM controller is capable of driving a white LED at 1.2V and can provide the necessary power to supply 2 series white LEDs at the minimum input voltage of 2.7V. Its efficiency is tagged at 86.12% for a single diode and 85.12% for a dual diode configuration. The controller is also able to provide regulation for resistive devices with efficiency of up to 93.82%. The layout of the controller is designed so that it can be compatible with smaller process technologies and requires little or no change to enable the design on these other process technologies.