Eight tips to improve the efficiency of LED driver power

Summarize the tips for improving the efficiency of lighting drive power during this time:

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. Choose a highly efficient topology

This is the beginning of the selection of the program, such as PWM and QR PFM. Currently, the customer is asked for the efficiency requirement, and it is necessary to evaluate what kind of topology is selected.

6. Choose a good electrolytic capacitor

Many people have neglected this, and the loss of electrolysis is very large. Teacher Chen Yongzhen has a detailed explanation in an article.

7. Start part of the power design

Under the premise of 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, there are also non-destructive startup of external circuits. I think Not suitable for LED drivers .

8. Chip-assisted power supply optimization

This point of the L6562D application document 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, so that the chip works at 15V to reduce losses.

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