3 results found for Ajmal Godil, displaying items 1 - 3
March 1, 2007[Ideas For Design] Minimize Input-Supply Ripple Current In LED Driver Applications
Consumer-based LED applications have really taken off. You now find them in home lighting, airplane cabin lights, automobile lights, MP3 players, and elsewhere. In the past, most LED drivers were based on some sort of charge pump, where the input voltage was multiplied by two and the LED voltage was post-regulated by an internal low-dropout regulator. But some high-power LEDs require much higher current before they start emitting light. Therefore, most of today's...
July 6, 2006[Ideas For Design] Turn Positive Buck/Boost Circuits Negative
Most common dc-dc power application circuits are designed for a positive buck or a boost circuit. However, certain designs may require a negative buck or boost topology. The problem usually arises because most board designers aren't accustomed to thinking in terms of negative voltages. The transfer function for a positive buck is VOUT/VIN = D, and interestingly, the transfer function for a negative buck is –VOUT/ ...
