LED driver power accuracy

When it comes to the accuracy of LED driver power supply, we usually think of constant current error. In fact, the driving accuracy is not limited to current accuracy. LED is a typical current-driven device. Accurate control of LED driver power supply can determine many parameters including light efficiency, power efficiency, heat dissipation and product brightness.

　　Driving LEDs mainly involves controlling their current. Whether it is directly increasing or decreasing the driving current, or reducing the switching time ratio by using the duty cycle (PWM), they are all ways to control the current, but they achieve different purposes. LED driver power supplies have their application flexibility, which will bring more power specifications in future designs. We must avoid too many power specifications to avoid many obstacles to future mass production.

　　In order to minimize the design flexibility and design specifications of LED driver power supply, we proposed a distributed constant current architecture. The principle of distributed constant current is to set up independent constant current sources at each parallel branch point to manage, maintain and control the stability of branches and branches, branches and the overall line.

　　The distributed constant current circuit can be regarded as a complete circuit structure in use, and the actual application is distributed at each node of the circuit. It is a circuit structure that can be controlled by constant current and can communicate with each other. The products of the distributed constant current design LED driver power supply have very high product stability and unique design advantages.

　　At present, there is a big gap between the claimed lifespan of LED driver power products and their actual lifespan. With limited accumulation of driver circuit design technology, using the method of evaluating product lifespan to measure actual lifespan is prone to errors, and the stability of the driver circuit will directly affect the overall stability of the product.