Jianwen Shao is an applications engineer with STMicroelectronics, Schaumberg, Ill. He holds an MS in electrical engineering from the Virginia Polytechnic Institute and State University, Blacksburg. Email address: jianwen.shao@st.com Web site: http://www.st.com
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July 24, 2008[Ideas For Design] Use A Boost Converter To Create An Auto-Dimmable LED Flashlight
Due to their light output and long life, high-brightness LEDs are well-suited for use in flashlights. Typically, the LEDs are driven with a constant current. So when the battery voltage drops, the flashlight just stops working. In some situations, this could be dangerous. It would be nice to have a flashlight that would automatically dim when the battery voltage drops. Just like a traditional flashlight, it would indicate a low-battery condition and...
