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LM3464 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM3464 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 22 page LM3464/LM3464A November 18, 2010 LED Driver with Dynamic Headroom Control and Thermal Control Interfaces General Description The LM3464/64A is a 4-channel high voltage current regula- tor that provides a simple solution for LED lighting applica- tions. The LM3464/64A provides four individual current regulator channels and works in conjunction with external N- channel MOSFETs and sense resistors to give accurate driv- ing current for every LED string. Additionally, the Dynamic Headroom Control (DHC) output can be interfaced to the ex- ternal power supply to adjust the LED supply voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding the optimal overall efficiency. Digital PWM or analog voltage signals can be used to control the duty cycle of the all the channels. When analog control is used, the dimming frequency can be programmed via an ex- ternal capacitor. A minimum duty cycle control is provided in the conditions that the analog dimming is configured as ther- mal feedback. Protection features include VIN under-voltage lock-out, LED open/short circuit and over-temperature fault signaling to the system controller. Features ■ Wide input voltage range 12V-80V (LM3464) 12V–95V (LM3464A) ■ Dynamic Headroom Control ensures maximum efficiency ■ 4 output channels with individual current regulation ■ High channel to channel accuracy ■ Digital PWM/Analog dimming control interface ■ Resistor programmable dimming frequency & minimum duty cycle (analog dimming mode) ■ Direct interface to thermal sensor ■ Fault detection ■ Over temperature protection ■ Thermal shutdown ■ Under voltage lockout ■ Thermal enhanced eTSSOP-28 package Applications ■ Streetlights ■ Solid State Lighting Solutions Typical Application 30115001 © 2010 National Semiconductor Corporation 301150 www.national.com |
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