NS LM3434 20A输出LED电源解决方案
NS公司的LM3434是自适应的DC/DC降压恒流电流控制器,提供了用于大功率LED照明的恒定电流.输出配置可使多个LED阳极连接到地以获得散热器最大效率.输入工作电压-9V到-30V,输出电流大于6A,PWM频率大于30kHz,开关频率高达1MHz,主要用在投映系统,固态照明和汽车照明.本文介绍了LM3434主要特性,方框图,10A输出和20A输出应用电路图,以及LM3434 20A输出评估板电路,材料清单和PCB布局图.
The LM3434 is an adaptive constant on-time DC/DC buck (step-down) constant current controller (a true current source). The LM3434 provides a constant current for illuminating high power LEDs. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy. The high frequency capable architecture allows the use of small external passive components and no output capacitor while maintaining low LED ripple current. Two control inputs are used to modulate LED brightness. An analog current control input is provided so the LM3434 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction.
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