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A Low-Power and Small-Area Pulse Width Modulator y Light Intensity for Photoflash  

Lee, Woo-Kwan (Dept. of Electrical Eng., Korea University)
Kim, Soo-Won (Dept. of Electrical Eng., Korea University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.7, 2008 , pp. 17-22 More about this Journal
Abstract
This paper presents a low-power and small-area pulse width modulator by light intensity for photoflash. Light intensity controller is achieved by using capacitor, photodiode, and comparator. The proposed circuit designs digital circuit to reduce static power consumption except comparator. And IGBT driver has short circuit protection using delay cell. The pulse width modulator has the operating range of $V_{MS}$ from 0.5V to 2.5V and pulse width of output from 0.14ms to 1.65ms at 300Hz. The pulse width modulator fabricated in $0.35-{\mu}m$ CMOS technology occupies $0.85mm{\times}0.56mm$. This circuit consumes 3.0mW at 300Hz and 3.0V.
Keywords
Pulse width modulator(PWM); Light intensity controller; IGBT driver; and Short circuit protection;
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