Analog Circuit Design

Freitas, Philippe; Navarro, David; O’Connor, Ian; Billiot, G.; Lapuyade, Hervé; Bégueret, Jean-Baptiste

doi:10.1007/978-1-4020-9341-8_6

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Subsequently, the voltage drop of CS pin will decrease below 0.4 V, and the IC will turn on again. The buck circuit formed by the IC will, in the above manner, cause the current through the inductor to fluctuate periodically with a small amplitude and at high frequency, thereby providing a nearly constant low current output for the LED circuit [25].…”

Section: Control Circuitmentioning

confidence: 99%

Failure Analysis of Some Commercial Spotlights Based on Light Emitting Diodes

Zhong

Walther

2021

Electronics

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The failure mechanism of two commercial light-emitting diode (LED)-based spotlights with GU10 form factor is analyzed. Through component testing and comparison to nominal values as well as to simulations, it is found that the cause of both device failures is related to damaged components within the drive circuits rather than the LEDs themselves. Both LED heads work as normal when connected to an external direct current (DC) source. The results show that the lack of light output of one spotlight is related to the open circuit caused by damaged resistors and inductors in its drive circuit, while the flickering of the other is related to the malfunction of the integrated circuit providing constant current output. Therefore, improving the quality of the LED drive circuits is considered the most effective way for manufacturers to reduce catastrophic failures of LED spotlights.

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Section: Control Circuitmentioning

confidence: 99%