An important consideration for LED lighting is that the operating life of the LED driver circuit and the LED itself should be comparable. Although there are many factors that affect the reliability of the drive circuit, electrolytic capacitors have a crucial impact on the overall reliability. In order to prolong the working life of the system, it is necessary to analyze the capacitors in the application in a targeted manner and select the appropriate electrolytic capacitors.
In fact, the effective working life of electrolytic capacitors is largely affected by the ambient temperature and the internal temperature rise caused by the ripple current acting on the internal impedance. The electrolytic capacitor manufacturer's rated life for electrolytic capacitors is based on exposure to the highest rated temperature environment and the application of the maximum rated ripple current. A typical capacitor rated life may be 5,000 hours at 105°C, the lower the actual operating stress the capacitor is exposed to compared to the rated level, the longer the effective operating life. Therefore, on the one hand, choosing an electrolytic capacitor with a long rated operating life and a high rated operating temperature can certainly prolong the operating life. On the other hand, depending on the actual stress and operating temperature, lower rated operating temperature and rated life capacitors can still be selected, providing a lower cost solution; in other words, maintaining proper stress and operating temperature is considered in the design , which can effectively extend the working life of electrolytic capacitors, making them more compatible with the life of LEDs.
For example, ON Semiconductor's GreenPoint® reference design for Offline LED Drivers for "Energy Star" solid-state lighting qualifies Panasonic's ECA-1EM102 aluminum electrolytic capacitors, rated at 1000µF, 25 V, 850 mA, 2,000 hours and 85°C. The usable life of this capacitor exceeds 120,000 hours at an assumed 50°C ambient temperature. Therefore, try to make the LED drive circuit work in a suitable temperature condition and properly handle the heat dissipation problem, so as to realize the matching problem of the LED drive circuit and the working life of the LED.
In general, if electrolytic capacitors must be used in LED drive circuits, efforts must be made to control the applied force and operating temperature of the capacitors, so as to maximize the working life of the capacitors to match the life of the LEDs; on the other hand, designers Electrolytic capacitors should also be avoided as much as possible.
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