Linear公司的LT3791是同步的四開關(guān)升壓-降壓LED驅(qū)動(dòng)控制器,可使VIN高于,低于或等于VOUT,效率高達(dá)98.5%,輸入電壓4.7V-60V,輸出電壓0-60V,LED電流精度±6%,真彩色PWM和模擬調(diào)光,每個(gè)IC輸入功率100W或大于100W,主要用于汽車前燈/行駛燈和通用照明.本文介紹了LT3791主要特性,方框圖,多種應(yīng)用電路以及演示板DC1666A主要特性,電路圖,材料清單和PCB元件布局圖,測(cè)試電路圖.
he LT?3791 is a synchronous 4-switch buck-boost LED driver controller. The controller can regulate LED current up to 52V of LED string with input voltages above, below, or equal to the output voltage. The constant-frequency, forced-continuous current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top MOSFET refresh switching cycle is needed in buck or boost operaTIon. With 60V input, 60V output capability and seamless transiTIons between operaTIng regions, the LT3791 is ideal for LED driver applicaTIons in automotive, industrial, and even battery-powered systems.
The LT3791 provides input current monitor, LED current monitor, and open or shorted LED fault condition, during which the LT3791 either restarts or latches off.

LT3791主要特性:

4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT

Synchronous Switching: Up to 98.5% Efficiency

Wide VIN Range: 4.7V to 60V

Wide VOUT Range: 0V to 60V (52V LED)

±6% LED Current Accuracy: 0V ≤ VLED < 52V

True Color PWM? and Analog Dimming

LED and Input Current Regulation with Current Monitor Outputs

No Top MOSFET Refresh in Buck or Boost

VOUT Disconnected From VIN During Shutdown

Open or Shorted LED Fault Protection

Capable of 100W or Greater per IC

38-Lead TSSOP with Exposed Pad

LT3791應(yīng)用:

Automotive Head Lamps/Running Lamps

General Purpose Lighting