Rainbow-electronics LM3822 Manual de usuario

LM3822Precision Current Gauge IC with Internal Zero OhmSense Element and PWM OutputGeneral DescriptionThe LM3822 Current Gauge provides easy to use pr

PWM Output and CurrentAccuracyOFFSETThe PWM output is quantized to 1024 levels. Therefore, theduty cycle can change only in increments of 1/1024.There

Look-Up TablesThe following tables show how to convert the duty cycle ofthe PWM output to a current value, and vice versa. Thequantization error of1⁄2

Timing Diagram10124911Duty cycle of the PWM waveform during any sampling interval indicates the current magnitude (average) and direction during the p

Physical Dimensions inches (millimeters) unless otherwise noted8-Lead MSOPSee Ordering Information table for Order NumbersNS Package Number MUA08ANati

Ordering InformationOrder No.*SenseRangeSamplingInterval*SensingMethodNSPackageNumberPackageTypeSupplied As:LM3822MM-1.0±1.0A 50 ms High-side MUA08A M

Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

Electrical Characteristics Typical numbers are at 25˚C and represent the most likely parametric norm.Specifications in standard type face are for TJ=

Typical Performance Characteristics Supply bypass capacitor is 0.1 µF and filter capacitor is0.1 µF.Measured Current vs Actual Current(LM3822-1.0)Meas

Typical Performance Characteristics Supply bypass capacitor is 0.1 µF and filter capacitor is0.1 µF. (Continued)Operating Current vs Temperature Shutd

Typical Application Circuits In the application circuits, the 0.1 µF ceramic capacitor between pins 1 and 2is used for bypassing, and the 0.1 µF ceram

Typical Application Circuits In the application circuits, the 0.1 µF ceramic capacitor between pins 1 and 2is used for bypassing, and the 0.1 µF ceram

Product OperationThe current is sampled by the delta-sigma modulator, asillustrated in Figure 4. The pulse density output of the delta-sigma modulator