Rainbow-electronics LM3824 Manual do Utilizador

LM3824Precision Current Gauge IC with Internal Zero OhmSense Element and PWM OutputGeneral DescriptionThe LM3824 Current Gauge provides easy to use pr

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 DiagramDS200007-11Duty cycle of the PWM waveform during any sampling interval indicates the current magnitude (average) and direction during th

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Ordering InformationOrder No.*SenseRangeSamplingInterval*SensingMethodNSPackageNumberPackageTypeSupplied As:LM3824MM-1.0±1.0A 6 ms High-side MUA08A MS

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

Common Device Parameters (Continued)Unless otherwise specified, VDD= 3.6V for the following specifications. Supply bypass capacitor is 1 µF and filter

Typical Performance Characteristics Supply bypass capacitor is 0.1 µF and filter capacitor is 0.1 µF.Measured Current vs Actual Current(LM3824-1.0)DS2

Typical Performance Characteristics Supply bypass capacitor is 0.1 µF and filter capacitor is0.1 µF. (Continued)Note 10: These curves represent a stat

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, as il-lustrated inFigure 4. The pulse density output of thedelta-sigma modulator

PWM Output and CurrentAccuracyOffsetThe PWM output is quantized to 128 levels. Therefore, theduty cycle can change only in increments of 1/128.There i