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Linear公司的LTC3787是高性能多相單輸出同步升壓電源轉(zhuǎn)換器控制器,能驅(qū)動兩個N溝功率MOSFET.輸入電壓4.5V-38V,輸出電壓高達(dá)60V,±1% 1.200V基準(zhǔn)電壓, 可編程固定頻率50kHz到900kHz,靜態(tài)電流135uA,主要用于工業(yè),汽車,醫(yī)療設(shè)備和軍用.本文介紹了LTC3787主要特性,方框圖, 12相工作連接圖以及高效2相24V,46V和48V升壓轉(zhuǎn)換器電路圖, 4相單輸出升壓轉(zhuǎn)換器電路圖,演示板DC1411A主要性能特性,電路圖,材料清單和PCB元件布局圖. The LTC3787 is a high performance PolyPhase single output synchronous boost converter controller that drives two N-channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, enabling high power boost applications. A 4.5V to 38V input supply range encompasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3787 can operate from an input supply as low as 2.5V after start-up. The operating frequency can be set for a 50kHz to 900kHz range or synchronized to an external clock using the internal PLL. PolyPhase operation allows the LTC3787 to be configured for 2-, 3-, 4-, 6- and 12-phase operation. The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode. operation, pulseskipping mode or forced continuous mode at light loads. LTC3787主要特性: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mmx 5mm QFN Package and Narrow SSOP Package LTC3787應(yīng)用: Industrial Automotive Medical Military 
圖1.LTC3787方框圖
圖2.LTC3787 12相工作連接圖
圖3.LTC3787高效2相24V升壓轉(zhuǎn)換器電路圖
圖4.LTC3787高效2相48V升壓轉(zhuǎn)換器電路圖
圖5.LTC3787高效2相36V升壓轉(zhuǎn)換器電路圖
圖6.LTC3787高效2相48V升壓轉(zhuǎn)換器電路圖
圖7.LTC3787采用電感DCR電流檢測的高效2相24V升壓轉(zhuǎn)換器電路圖
圖8.LTC3787 4相單輸出升壓轉(zhuǎn)換器電路圖 演示板DC1411A主要性能特性:
演示板DC1411A材料清單:
圖11.演示板DC1411A PCB元件布局圖:底層 詳情請見: 
3787fc.pdf
(362.25 KB)
和
dc1411A.pdf
(711.07 KB)
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