LED electronic display screens generally have a relatively large area, and the overall power consumption is also relatively large, so it is particularly important to increase the power usage of the electronic screen. Then, in order to increase the power of LED electronic display, LED display manufacturers remind the need to solve the following problems

1. Reasonable selection of switching devices: This is the balance of cost and performance. What kind of customer requirements and what kind of devices are used, but it must be reasonable. If you want efficiency, there is no doubt that COOL MOS, low VF output diode.

2. Many people ignore this when choosing a good electrolytic capacitor, and the loss of electrolysis is very large.

3. Under the premise that the power consumption design of the startup part is efficient, it must be considered. At present, many chips have HV startup pins, and the startup current is getting lower and lower. This is to know more about new devices. Of course, there are additional I don’t think it is suitable for LED driving.

4. The main current loop PCB should be as short as possible: The experience and layout of LAYPCB are nothing. The quick way is to look at the works of major manufacturers.

5. Optimize the design of transformer parameters: reduce eddy current loss caused by ringing. This is more difficult. First, you must master the basic knowledge of electromagnetics and design a reasonable transformer. The most important thing is patience. Even if you think of improving the efficiency by 0.5%, you must try.

6. Chip auxiliary power supply optimization This point is pointed out in ST's L6562D application document, 15V is the best, but LED generally has a wide voltage output, so my choice is to add a linear voltage regulator to make the chip work at 15V to reduce loss.