</a>DC/DC轉換器" title="DC/DC轉換器">DC/DC轉換器" title="DC/DC轉換器">DC/DC轉換器,集成了開關控制器,功率FET,電感和所有支持元件.輸入電壓4.5V-16V,輸出電壓0.6V-2.5V,多個應用時輸出電流高達100A,可調開關頻率,頻率同步,過流保護,內部溫度檢測二極管輸出,輸出過壓保護,主要用在通信和網絡設備,存儲器和ATCA卡,工業設備.本文介紹了LTM4620主要特性,簡化框圖和多種應用電路,00A多相演示板1780A-C主要特性,電路圖,材料清單和PCB元件布局圖.

The LTM®4620 is a complete dual 13A output switching mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductors, and all supporting components. Operating from an input voltage range of 4.5V to 16V, the LTM4620 supports two outputs each with an output voltage range of 0.6V to 2.5V, set by a single external resistor. Its high efficiency design delivers up to 13A continuous current for each output. Only a few input and output capacitors are needed.

The device supports frequency synchronization, multiphase operation, Burst Mode operation and output voltage tracking for supply rail sequencing and has an onboard temperature diode for device temperature monitoring. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.

Fault protection features include overvoltage and overcurrent protection. The power module is offered in a proprietary space saving and thermally enhanced 15mm × 15mm ×4.41mm LGA package with integrated top-side heat sink.

The LTM4620 is RoHS compliant with a PB-free finish.

LTM4620主要特性:

Complete Standalone Dual Output Power Supply

Dual 13A or Single 26A Output

Wide Input Voltage Range: 4.5V to 16V

Output Voltage Range: 0.6V to 2.5V

±1.5% Maximum Total DC Output Error

Multiphase Current Sharing with Multiple LTM4620s Up to 100A

Differential Remote Sense Amplifier

Current Mode Control/Fast Transient Response

Adjustable Switching Frequency

Overcurrent Foldback Protection

Frequency Synchronization

Internal Temperature Sensing Diode Output

Output Overvoltage Protection

Low Profile (15mm × 15mm × 4.41mm) LGA Package

TM4620應用:

Telecom and Networking Equipment

Storage and ATCA Cards

Industrial Equipment

圖1.LTM4620簡化框圖

圖2.輸出跟蹤的LTM4620應用電路

圖3.LTM4620 5V-16V輸入,1.5V和1.2V 13A輸出電路圖

圖4.LTM4620帶溫度監視的2相1.5V 26A應用電路

圖5.LTM4620 1.2V和1V 輸出跟蹤電路

圖6.LTM4620 4相1.2V 50A電路圖

演示板1780A-C

Demonstration circuit 1780A-C features poly phase design using the LTMR4620EV, the high efficiency, high density, dual 13A, switch mode step-down power module regulator.

The input voltage is from 4.5V to 16V. The output voltage is jumper selectable from 1.0V to 2.5V. DC1780A-C can deliver nominal 100A output current with 4× LTM4620s in parallel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The LTM4620 on DC1780A-C always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. The board allows the user to program how its output voltage ramps up and down through the TRACK_CONTROL pin. The output voltage is tightly regulated between VOUT + and VOUT – through remote output voltage sensing which improves output voltage regulation at heavy loads. These features and the availability of the LTM4620EV in a compact 15mm × 15mm × 4.41mm LGA package make it ideal for use in many high density point-of-load regulation applications.

The LTM4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying the demo circuit DC1780A-C.

圖7.100A多相演示板1780A-C外形圖

圖8.100A多相演示板1780A-C電路圖(1)

圖9.100A多相演示板1780A-C電路圖(2)

圖10.100A多相演示板1780A-C電路圖(3)

圖11.100A多相演示板1780A-C電路圖(4)

100A多相演示板1780A-C材料清單(BOM):



圖12.100A多相演示板1780A-C PCB元件布局圖(頂層)

圖13.100A多相演示板1780A-C PCB元件布局圖(底層)
詳情請見:
http://cds.linear.com/docs/Datasheet/4620f.pdf
和
http://cds.linear.com/docs/Demo%20Board%20Manual/dc1780acfa.pdf
以及
http://cds.linear.com/docs/Demo%20Board%20Schematic/1780a-csch.pdf