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LED以其工作电压低、耗电量小、发光效率高、寿命长等优点,成为目前节能环保灯光照明系统的主流应用方案。我们基于LT3598的拓扑结构,设计了其外围电路,就LT3598多通道LED驱动电路的设计要求,合理选取关键元器件,如电感、电容、二极管等,优化设定开关频率,并进行了过压、过流、热保护的设计。最后,通过具体电路实验,证实了此电路的稳定性和可靠性,并进行了模拟调光和PWM调光实验效果对比,说明了各自的优缺点。
LED with its low operating voltage, low power consumption, high luminous efficiency, long life, etc., become the current energy-saving lighting system, the mainstream application program. Based on the topology of LT3598, we designed its peripheral circuits. Based on the design requirements of the LT3598 multi-channel LED driver circuit, we selected the key components, such as inductors, capacitors, diodes and so on, optimized the switching frequency and overvoltage, Overcurrent, thermal protection design. Finally, through the concrete circuit experiment, the stability and the reliability of this circuit are confirmed, and the comparison of simulation dimming and PWM dimming experiment results shows their respective advantages and disadvantages.