1. The main current loop PCB is as short as possible. The experience and layout of LAYPCB, this is nothing, the quick way is to look at the works of Dachang.

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

3. Reasonable selection of switching devices. This is the balance between cost and performance, what kind of customer requirements, what kind of device to use, but reasonable. If you want efficiency, there is no doubt COOL MOS, low VF output diode.

4. Input EMI part optimization design If you have passed the safety regulations, this part is more studied, mainly the experience.

5. Choosing a high-efficiency topology. This is the beginning of the solution selection, such as PWM and QR PFM. Currently, when the customer asks for efficiency requirements, it is necessary to evaluate what kind of topology is selected.

6. Choosing a good electrolytic capacitor Many people have neglected this, and the loss of electrolysis is very large. There is a detailed explanation in the article by Mr. Chen Yongzhen.

7. Under the premise of starting part of the power consumption design efficiency, it is necessary to consider that many chips currently have HV start pins, and the starting current is also getting lower and lower. This is to know more about the new devices, of course, plus Circuit lossless start, etc., I think it is not suitable for LED driver.

8. We can see the chip-assisted power supply optimization. In the L6562D application document of ST, it is pointed out that 15V is the best, but the LED is generally a wide voltage output, so my choice is to add a linear regulator to make the chip work. 15V to reduce losses.

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