LM317T Voltage Regulator with Pass Transistor

Link to page: www.pcbheaven.com This is the remake of the third episode of the LED driving and controlling methods Theory Series. In this episode i explain how can someone design a constant current LED driver with a single transistor, biased with a Zener diode to achieve constant current regulation regardless of the power supply voltage. Additionally, i analyze a second circuit with sme functionality but instead of the Zener diode i use two simple diodes. On-line calculator for this circuit: www.pcbheaven.com



http://www.youtube.com/watch?v=fMc99rM6u4k&hl=en

www.onsemi.com Learn about the different solutions available for driving LEDs in landscape and MR-16 end applications. Understand the operation of a buck-boost topology and key design considerations in these designs. Watch a demonstration showing a practical execution of an MR-16 end application reference design. See the benefits of using ON Semiconductor products for driving LED applications.



http://www.youtube.com/watch?v=TiiknCsG8uA&hl=en

www.onsemi.com Learn about the different solutions available for driving LEDs in various applications. Watch a demonstration of a trailer light application comparing a common resistor biased solution and a Constant Current Regulator (CCR) biased solution. See the benefits of using CCRs for driving LED applications.



http://www.youtube.com/watch?v=zKVL2XWqDI0&hl=en