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MAX4081TASA+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4081TASA+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 14 page 76V, High-Side, Current-Sense Amplifiers with Voltage Output ______________________________________________________________________________________ 11 Table 1. Typical Component Values FULL-SCALE LOAD CURRENT, ILOAD (A) CURRENT-SENSE RESISTOR (m Ω) GAIN (V/V) FULL-SCALE VSENSE (mV) MAX4081 FULL-SCALE OUTPUT VOLTAGE (VOUT - VREF, V) 0.500 1000 5 ±500 ±2.5 0.125 1000 20 ±125 ±2.5 0.050 1000 60 ±50 ±3.0 5.000 100 5 ±500 ±2.5 1.250 100 20 ±125 ±2.5 0.500 100 60 ±50 ±3.0 50.000 10 5 ±500 ±2.5 12.500 10 20 ±125 ±2.5 5.000 10 60 ±50 ±3.0 FULL-SCALE LOAD CURRENT, ILOAD (A) CURRENT-SENSE RESISTOR (m Ω) GAIN (V/V) FULL-SCALE VSENSE (mV) MAX4080 FULL-SCALE OUTPUT VOLTAGE (V) 1.000 1000 5 1000 5.0 0.250 1000 20 250 5.0 0.100 1000 60 100 6.0 10.000 100 5 1000 5.0 2.500 100 20 250 5.0 1.000 100 60 100 6.0 50.000 10 5 500 2.5 25.000 10 20 250 5.0 10.000 10 60 100 6.0 External References (MAX4081) For the bidirectional MAX4081, the VOUT reference level is controlled by REF1A and REF1B. VREF is defined as the average voltage of VREF1A and VREF1B. Connect REF1A and REF1B to a low-noise, regulated voltage source to set the output reference level. In this mode, VOUT equals VREF1A when VSENSE equals zero (see Figure 4). Alternatively, connect REF1B to ground, and REF1A to a low-noise, regulated voltage source. In this case, the out- put reference level (VREF) is equal to VREF1A divided by two. VOUT equals VREF1A/2 when VSENSE equals zero. In either mode, the output swings above the reference voltage for positive current-sensing (VRS+ > VRS-). The output swings below the reference voltage for negative current-sensing (VRS+ < VRS-). Applications Information Recommended Component Values Ideally, the maximum load current develops the full- scale sense voltage across the current-sense resistor. Choose the gain needed to yield the maximum output voltage required for the application: VOUT = VSENSE AV where VSENSE is the full-scale sense voltage, 1000mV for gain of 5V/V, 250mV for gain of 20V/V, 100mV for gain of 60V/V, and AV is the gain of the device. In applications monitoring a high current, ensure that RSENSE is able to dissipate its own I2R loss. If the resis- tor’s power dissipation is exceeded, its value may drift or it may fail altogether. The MAX4080/MAX4081 sense a wide variety of cur- rents with different sense-resistor values. Table 1 lists common resistor values for typical operation. |
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