Switching LED Driver
As for the function of spread spectrum, it is the function of alleviating the noise concentrated in a specific switching frequency by deliberately modulating the switching frequency. Spread spectrum can extend the total electromagnetic emission energy to a larger range and significantly reduce the average energy of electromagnetic interference. Under spread spectrum conditions, electromagnetic interference testing can use a smaller size and lower cost filter circuit; With the popularization of vehicle electrification and automatic driving, the EMC registration requirements for on-board equipment are becoming more and more stringent. By increasing the spread spectrum function, as long as a small number of peripheral filter parts can easily pass the CISPR25/Class5 EMC standard, analog dimmer ICTRL is used for over-temperature and current reduction protection, and NTC thermistor is connected. As the LED current temperature rises, the thermistor resistance value decreases, the VICTRL voltage decreases, and the output current can be derated according to the voltage of the ICTRL pin.
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