Eight tips to improve the efficiency of LED driver power supply

1. Main current loop PCB as short as possible.

LAYPCB experience, and layout, this is nothing, the quick way is to see more works of manufacturers.

2. Optimize the transformer parameter design to reduce eddy current losses caused by ringing.

This is more difficult, we must first grasp the basic electromagnetic theory, design a reasonable transformer, the most important thing is patience, even if it is to think of can improve the efficiency of 0.5%, but also to try.

3. Reasonable selection of switching devices.

This is the cost and performance of the balance, what kind of customer requirements, what kind of device, but it is reasonable. If you want efficiency, no doubt COOL MOS, low VF output diode

4. Enter the EMI part of the optimal design

If the security rules, this part more elegant, mainly the experience.

5. Choose efficient topology

This is the beginning of the program selection, such as PWM and QR PFM, the current mention of the efficiency requirements of customers, it is necessary to assess what kind of selection

6. Choose a good electrolytic capacitor

Many people ignore this, a great loss of electrolysis, Chen Yong teacher there is a detailed explanation of the article

7. Start part of the power design

Efficient under the premise, it is necessary to consider that many chips have HV start foot, starting current is also getting lower and lower, this is to know more about the new device, of course, there are additional circuits such as non-destructive start, I think Not suitable for LED driver.

Chip-assisted power optimization

This ST's L6562D application note 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, the chip work at 15V to reduce losses.