Questions regarding driving high power LEDs circuits Circuit Diagram A constant-current power regulator is a must for LED illumination because a high-power LED's current may double with a voltage increase of only 10% - meaning that there is a high possibility of damage to the LED. The power stage's topology and flexible dimming control are two main considerations for choosing LED illumination drivers, as note demonstrates a minimal parts count driver/control-ler for a high-power (1W or greater) LED. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675 PICยฎ microcontroller. The switching power supply design ensures efficient power transfer between the system battery and the
Now coming back to our LED driver subject, in this post I will elucidate two simple methods of designing LED drivers, 1) SMPS method, 2) capacitive power supply method. Warning: Circuits I have explained below are not isolated from mains AC, and therefore are extremely dangerous to touch in the powered and open condition.
PDF Buck Configuration High Circuit Diagram
The LED voltage was ~23V, the power supply 24V. So no other way than to use a buck-boost regulator here. Yes, in essence it's a boost regulator, but instead working to GND you work to 24V
Constant Current Driver: The driver ensures that the LED gets a constant current regardless of voltage fluctuations. This is ideal for LEDs that require a fixed current for proper operation. Constant Voltage Driver: The driver maintains a steady voltage but allows the current to fluctuate based on the load.This is typically used when the LED needs a specific voltage, regardless of the current
Advanced LED Driver Circuit Design Circuit Diagram
The main consideration when deciding on how to drive LEDs is how much power loss is acceptable. In battery-powered devices, this power loss equates to diminished battery life. In high-power LED applications, it equates to heat generated. Before choosing how to drive the LEDs, have an idea of how much power your design allows you to dissipate.
