Linear 公司的LTM4613是完整的超低噪音8A開關模式DC/DC電源,封裝內(nèi)包括開關控制器,功率FET,電感和所有的支持元件.輸入電壓范圍從5V到36V,輸出電壓3.3V-15V,由單個外接電阻設定,輸出電流8A,可并行輸出.主要用在通信和網(wǎng)絡設備,工業(yè)和航空電子,RF系統(tǒng).本文介紹了LTM4613主要特性,方框圖,多種應用電路以及演示板電路圖和材料清單.
The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor and all support components. Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range of 3.3V to 15V, set by a single external resistor. Only bulk input and output capacitors are needed to finish the design.
High switching frequency and an adaptive on-time current mode architecture enables a very fast transient response to line and load changes without sacrificing stability.
The onboard input filter and noise cancellation circuits achieve low noise coupling, thus effectively reducing the electromagnetic interference (EMI).
Furthermore, the DC/DC μModule. regulator can be synchronized with an external clock to reduce undesirable frequency harmonics and allow PolyPhase. operation for high load currents.
The LTM4613 is offered in a space saving and thermally enhanced 15mm x15mm x4.32mm LGA package, which enables utilization of unused space on the bottom of PC boards for high density point-of-load regulation. The LTM4613 is Pb-free and RoHS compliant.
LTM4613主要特性：
Complete Low EMI Switch Mode Power Supply
EN55022 Class B Compliant
Wide Input Voltage Range: 5V to 36V
8A Output Current
3.3V to 15V Output Voltage Range
Low Input and Output Referred Noise
Output Voltage Tracking and Margining
PLL Frequency Synchronization
2% Maximum Total DC Error
Power Good Tracks with Margining
Current Foldback Protection
Parallel/Current Sharing
Ultrafast Transient Response
Current Mode Control
Programmable Soft-Start
Output Overvoltage Protection
–55℃ to 125℃ Operating Temperature Range (LTM4613MPV)
Small Surface Mount Footprint, Low Profile (15mmx15mmx4.32mm) LGA Package
LTM4613應用：
Telecom and Networking Equipment
Industrial and Avionic Equipment
RF Systems
圖1.LTM4613簡化方框圖
圖2.LTM4613應用電路圖:22V-36VIN,12V/8A設計
圖3.LTM4613應用電路圖:5V-36VIN,3.3V/8A設計,400kHz頻率
圖4.LTM4613應用電路圖:26V-36VIN,15V/5A設計,600kHz頻率
圖5.LTM4613應用電路圖:兩相并行12V/16A設計,600kHz頻率
圖6.LTM4613應用電路圖:兩相并行12V/16A設計,600kHz頻率
圖7.LTM4613應用電路圖:兩相,5V和3.3V/8A設計,500kHz頻率,輸出電壓跟蹤
演示板DC1743A
Demonstration circuit DC1743A features the LTM®4613EV, an EN55022 class B certified, high input and output voltage, high efficiency, switch mode step-down power μModule® regulator. The input voltage range is from 5V to 36V. The output voltage is jumper programmable from 3.3V to 12V with a rated load current of 8A. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions: please refer to LTM4613 data sheet for derating curves.
Only input and output capacitors are needed externally. The DC1743A offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. Output voltage margining can also be realized through jumper position selections.
Higher efficiency at low load currents is achieved by setting the MODE pin jumper to DCM. The PLL pin is available to synchronize the LTM4613EV to an external clock. The LTM4613 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1743A.
圖8.演示板DC1743A外形圖
圖9.演示板DC1743A電路圖
演示板DC1743A材料清單(B)M):
詳情請見:
http://cds.linear.com/docs/Datasheet/4613f.pdf
和
http://cds.linear.com/docs/Demo%20Board%20Manual/dc1743af.pdf
