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A high RSENSE value causes the power-source voltage to drop due to IR loss. For minimal voltage loss, the engineer should use the lowest RSENSE value possible. A high RSENSE value allows lower currents to be measured more accurately because offsets are less significant when the sense voltage is larger. Note that the tolerance and temperature coefficient of the chosen resistors directly affect the precision of any measurement system. For best performance, select RSENSE to provide approximately maximum input differential sense voltage of 110 mV (MAX44284F) or 55 mV (MAX44284H) or 27.5 mV (MAX44284W) or 11 mV (MAX44284E) of sense voltage for the full-scale current in each application. Sense resistors of 5 mΩ to 100 mΩ are available with 1% accuracy or better. At high current levels, the I2R losses in RSENSE can be significant. This should be taken into consideration when choosing the resistor value and its power dissipation (wattage) rating. The sense resistor’s value will drift if it is allowed to heat up excessively. The precision VOS of the MAX44284 allows the use of small sense resistors to reduce power dissipation and reduce hot spots. Because of the high currents that may flow through RSENSE based on the application, take care to eliminate solder and parasitic trace resistance from causing errors in the sense voltage. Either use a four-terminal current-sense resistor or use Kelvin (force and sense) PCB layout techniques.
PTM Published on: 2015-02-13
