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| NS LM3433高亮LED驱动解决方案 | |||||
作者：NS 文章来源：NS 点击数： 更新时间：2007-12-6  |
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Common Anode Capable High Brightness LED Driver with High Frequency Dimming General Description The LM3433 is an adaptive constant on-time DC/DC buck (step-down) constant current controller (a true current source). The LM3433 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 LM3433 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction. The other input is a logic level PWM control of LED current. The PWM functions by shorting out the LED with a parallel switch allowing high PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3433 is available in a low profile LLP-24 package. 主要特性: ■ Operating input voltage range of -9V to -14V w.r.t. LED anode ■ Control inputs are referenced to the LED anode ■ Output current greater than 6A ■ Greater than 30kHz PWM frequency capable ■ Negative output voltage capability allows LED anode to be tied directly to chassis for maximum heat sink efficacy ■ No output capacitor required ■ Up to 1MHz switching frequency ■ Low IQ, 1mA typical ■ Soft start ■ Adaptive programmable ON time allows for constant ripple current ■ LLP-24 package 应用: ■ LCD backlighting ■ Projection systems ■ Solid state lighting ■ Automotive lighting  图1. LM3433方框图 图2. LM3433应用电路图  图3. 输出电流2A 到6A应用电路图  图4. 输出电流2A 到14A应用电路图 详情请见: >http://cache.national.com/ds/LM/LM3433.pdf |
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