The reference design powers RGB LEDs in moveable projectors, offering environment friendly present management, quick response, and exact coloration administration for numerous functions.
A 6A RGB LED driver is a important element in high-performance lighting and show techniques, offering exact management and energy administration for RGB (Pink, Inexperienced, Blue) LEDs. By delivering a excessive present of as much as 6A, this driver ensures optimum brightness, making it best for functions comparable to projectors, large-scale shows, and superior lighting setups. Its skill to control energy effectively, handle warmth, and supply easy coloration mixing and dimming is crucial for reaching correct coloration illustration, secure operation, and energy-efficient efficiency in trendy digital gadgets. The reference design from Analog Units (ADI) is for a 6A step-down LED driver utilized in a conveyable projector. It’s constructed across the MAX16821, a PWM high-brightness LED driver. The circuit is designed to drive a single LED, and three MAX16821 gadgets are wanted to energy RGB LEDs.
The LED driver steps down an enter provide voltage of 10V to 15V to offer a continuing present to an LED with a ahead voltage vary of 4.5V to 6V. The step-down converter is applied utilizing the MAX16821 PWM high-brightness (HB) LED driver. For the reason that common inductor present is the same as the LED present, the inductor present is regulated to make sure a gentle present is delivered to the LED. The switching frequency is about to 300kHz, managed by resistor R6 (200kΩ).
The system operates with two management loops: the interior present loop and the outer voltage loop. The interior present loop controls the inductor present primarily based on the output from the outer voltage loop, whereas the outer voltage loop applications the interior loop to control the LED present.
An op amp takes a easy enter voltage between 1.1V and a pair of.8V to regulate how a lot present flows to the LED, starting from 1.5A to 6A. When the LED wants 6A of present, the op amp adjusts its output to about 20mV, which is simply sufficient to drive the MAX16821.
Theresistors assist measure and modify the present, ensuring the correct quantity flows to the LED. They work collectively to set a reference voltage of 100mV on the enter when the LED present is at 6A.
The design wants the LED present to rise and fall inside 1 microsecond (1μs) when the LED present is about to 6A throughout PWM. To realize this, a small output capacitor and a bigger inductor are used to maintain the LED present ripple inside limits. When the LED present is about to 6A, the MAX16821 retains the inductor present regular at 6A.
ADI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra knowledge in regards to the reference design. To learn extra about this reference design, click on right here.
