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[原创] Linear LTC2992双路电源电压电流和功率监测解决方案

关键词:电源管理 电源监测 LTC2992

时间:2017-12-13 10:40:34       作者:Linear       来源:中电网

Linear公司的LTC2992是可测量两个电源电流,电压和功率的双路电源监测器,工作电压2.7V-100V,采用并联电阻可测量到大于100V电源,集成的两个8/12位ADC,不调整总误差小于±0.3%,主要用在通信基础设备,工业设备,汽车电子,计算机系统和服务器.本文介绍了LTC2992主要特性,框图,多种应用电路,以及演示板DC2561A主要特性,建立图,电路图,材料清单和PCB设计图.

The LTCR2992 is a rail-to-rail system monitor that measurescurrent, voltage, and power of two supplies. Itfeatures an operating range of 2.7V to 100V and includesa shunt regulator for supplies above 100V. The voltagemeasurement range of 0V to 100V is independent of theinput supply. Two ADCs simultaneously measure eachsupply’s current. A third ADC monitors the input voltagesand four auxiliary external voltages. Each supply’s currentand power is added for total system consumption. Minimumand maximum values are stored and an overrangealert with programmable thresholds minimizes the needfor software polling. Data is reported via a standard I2Cinterface. Shutdown mode reduces current consumptionto 25μA typically.

The LTC2992 I2C interface includes separate data inputand output pins for use with standard or opto-isolated I2Cconnections. The LTC2992-1 has an inverted data outputfor use with inverting opto-isolator configurations.

LTC2992主要特性:

Rail-to-Rail Input Range: 0V to 100V
Wide Input Supply Range: 2.7V to 100V
Measures Current, Voltage, and Power
Shunt Regulator for Supplies >100V
8-/12-Bit ADCs with Less Than ±0.3% Total UnadjustedError
Four General Purpose Inputs/Outputs Configurableas ADC Inputs
Continuous Scan and Snapshot Modes
Stores Minimum and Maximum Measurements
Alerts When Alarm Thresholds Exceeded
Shutdown Mode with IQ < 50μA
Split SDA Pin Eases Opto-Isolation
Available in 16-Lead 4mm × 3mm DFN and MSOPPackages

LTC2992应用:

Telecom Infrastructure
Industrial Equipment
Automotive
Computer Systems and Servers

图1.LTC2992框图

图2.LTC2992双路高边电源监视器电路图

图3.LTC2992应用案例:带I2C电流电压和功率监视器的TCA系统

图4.LTC2992应用电路:带瞬态保护200V的-48V冗余供电电路图(1.5kHz I2C接口)

图5.LTC2992应用电路:宽电压范围高边和低边电流检测

图6.LTC2992应用电路:带一个负电压监视器的双路12V高边电源监视器

图7.LTC2992应用电路:48V 500W电动自行车/滑板车电源监视器

图8.LTC2992应用电路:四路正交电源监视器(10kHz I2C接口)

图9.LTC2992应用电路:电源效率表

图10.LTC2992应用电路:双向30V-300V高边电源监视器

图11.LTC2992应用电路:双极电源监视器(1.5kHz I2C接口)

演示板DC2561A

Demonstration Circuit 2561A features the LTC®2992, arail-to-rail system monitor that measures current, voltage,and power of two supplies. It features an operatingrange of 2.7V to 100V and includes a shunt regulator forsupplies above 100V. The voltage measurement range of0V to 100V is independent of the input supply. Two ADCssimultaneously measure each supply’s current. A thirdADC monitors the input voltages and four auxiliary externalvoltages. Each supply’s current and power is addedfor total system consumption. Minimum and maximumvalues are stored and an over range alert with programmablethresholds minimizes the need for software polling.Data is reported via a standard l2C interface. Shutdownmode reduces power consumption to 25μA typically.

The demo board features nested pads for a range of senseresistor package sizes to support a wide range of powerapplications. It is populated for a 5A application. This canbe changed by replacing RSNS1 and RSNS2 with appropriateresistors.

图12.演示板DC2561A建立图

图13.演示板DC2561A电路图

图14.演示板DC2561A PCB装配图(顶层)

图15.演示板DC2561A PCB装配图(底层)
演示板DC2561A材料清单见:
DC2561A-1-BOM.XLS
详情请见:
http://cds.linear.com/docs/en/datasheet/2992f.pdf
http://cds.linear.com/docs/en/demo-board-manual/DC2561AF.PDF
以及http://cds.linear.com/docs/en/demo-board-schematic/DC2561A1-SCH.PDF
2992f.pdf
DC2561AF.PDF
DC2561A1-SCH.PDF

 

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