Tips for improving the efficiency of LED driver power supplies
Release date: 2017-12-01 Source: led network share: 
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 to master the basics first put electromagnetic, well-designed transformers, the most important thing is patience, even if it is thought to improve the efficiency of 0.5%, is also going to try.
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 ignore this, and the loss of electrolysis is large.
7. Start the premise of part-power design efficient, we must consider that in many chips have HV startup script, startup current is also growing in low, on this point is to learn more about the new devices, of course, there The external circuit is not damaged, 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 drop low loss.
Tags: Tips for improving LED drive power efficiency
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