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Delve deeply and work diligently to achieve new heights
All colleagues unite and focus their efforts to write a new chapter of developmentEight Approaches to Enhancing the Efficiency of LED Driver Power Supplies
所属分类： Industry News
发布时间：2020-06-02
Regarding Enhancement
LED driver power supply Summary of Efficiency Techniques:
1. Keep the main current loop on the PCB as short as possible. Based on LAYPCB’s experience and layout guidelines, there’s not much to add—your quickest approach is to study the designs of major manufacturers.
2. Optimize the transformer’s parameter design to reduce eddy‑current losses caused by ringing. This is quite challenging; first, you need a solid grasp of electromagnetic fundamentals and must design a well‑balanced transformer. Most importantly, patience is key—every effort counts, even if it promises just a 0.5% improvement in efficiency.
3. Select switching devices appropriately. This involves balancing cost and performance: choose components that meet the specific requirements of your application, while ensuring they are used in a rational and well‑justified manner. If efficiency is paramount, there’s no doubt—use CoolMOS MOSFETs and low‑VF output diodes.
4. Input EMI Section Optimization Design: If the design needs to comply with safety regulations, this aspect requires considerable expertise and relies heavily on practical experience.
5. Selecting a high-efficiency topology—this marks the beginning of the design‑option selection process. For example, when comparing PWM and QR PFM topologies, if the customer specifies an efficiency requirement, it is essential to evaluate which topology best meets that criterion.
6. Choosing high-quality electrolytic capacitors—many people overlook this point. Electrolytic capacitors have significant losses, and Teacher Chen Yongzhen provides a detailed explanation in one of his articles.
7. When designing the startup circuitry, it’s essential to consider efficiency; many ICs feature an HV startup pin, and the required startup current continues to decrease. This calls for a thorough understanding of newer devices. Additionally, external circuits that enable lossless startup are not suitable for LED drivers.
8. Chip‑assisted power‑supply optimization: The ST L6562D application note specifies 15 V as the optimal supply voltage; however, LEDs typically operate over a wide input voltage range. Therefore, I opted to add a linear regulator stage to keep the chip at 15 V, thereby reducing power losses.
