原标题：Linear LTM4651 58V 24W反相输出μModule稳压方案

　　Linear公司的LTM4651是EN55022B兼容58V/24W反相输出DC/DC μModule稳压器,输入电压3.6V - 58V,输出VOUT在-5V到-26.5V之间,输出电流高达4A,开关频率在250kHz - 3MHz,主要用在航空电子设备,工业控制和测试设备厂,视频,图像和仪表,48V通信和网络电源,RF系统.本文介绍了LTM4651主要特性,框图,测试电路和应用电路,以及演示板DC2328A主要特性,电路图和材料清单.

　　The LTMR4651 is an ultralow noise, 58V, 24W DC/DCμModuleR inverting topology regulator. It regulates a negativeoutput voltage (VOUT–) from a positive input supplyvoltage (VIN), and is designed to meet the radiated emissionsrequirements of EN55022. Conducted emission requirementscan be met by adding standard filter components.Included in the package are the switching controller, powerMOSFETs, inductor, filters and support components.

　　The LTM4651 can regulate VOUT–to a value between–0.5V and–26.5V, provided that its input and outputvoltages adhere to the safe operating area criteria of theLTM4651: VIN + |VOUT–|≤ 58V. A switching frequencyrange of 250kHz to 3MHz is supported (400kHz default)and the module can synchronize to an external clock.

　　Despite being an inverting topology regulator, no level shiftcircuitry is needed to interface to the LTM4651’s RUN,PGOOD or CLKIN pins; those pins are referenced to GND.The LTM4651 is offered in a 15mm × 9mm × 5.01mm BGApackage with SnPb or RoHS compliant terminal finish.

　　LTM4651主要特性:

　　Complete Low EMI Switch Mode Power Supply

　　EN55022 Class B Compliant

　　Wide Input Voltage Range: 3.6V to 58V

　　Up to 4A Output Current

　　24W Output from 12VIN to–24VOUT,PLOSS=5W,TA=60℃,tRISE=60℃,200LFM

　　Output Voltage Range:–26.5V ≤ VOUT–≤–0.5V

　　Safe Operating Area: VIN + |VOUT–| ≤ 58V

　　±1.67% Total DC Output Voltage Error Over Line,Load and Temperature(–40℃ to 125℃)

　　Parallel and Current Share with Multiple LTM4651s

　　Constant-Frequency Current Mode Control

　　Frequency Synchronization Range: 250kHz to 3MHz

　　Power Good Indicator and Programmable Soft-Start

　　Overcurrent/Overvoltage/Overtemperature Protection

　　15mm×9mm×5.01mm BGA Package

　　应用:

　　Avionics, Industrial Control and Test Equipment

　　Video, Imaging and Instrumentation

　　48V Telecom and Network Power Supplies

　　RF Systems

　　图1.LTM4651简化框图

　　图2.LTM4651测试电路图

　　图3.LTM4651应用电路:24V输入,-24V/4A输出,2相并联应用,fsw=1.5MHz

　　演示板DC2328A

　　Demonstration circuit 2328A is an inverting buck-boostconverter with 12V to 34V input voltage, –24V output voltageand max 2A output current capability, which featuresthe LTM®4651Y. The LTM4651 is an ultralow noise, 58V,24W inverting-topology DC/DC μModule regulator. It isdesigned to meet the radiated emissions requirement ofEN55022B. A switching frequency range of 250kHz to3MHz is supported and the module can synchronize toan external clock. The LTM4651 data sheet must be readin conjunction with this demo manual prior to working onor modifying demo circuit DC2328A.

　　图4.演示板DC2328A外形图

　　演示板DC2328A材料清单:

　　详情请见:

DC2328A-4-SCH.pdf

4651f.pdf

DC2328AF.pdf