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TS1101-200EG6 Datasheet(PDF) 6 Page - Silicon Laboratories |
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TS1101-200EG6 Datasheet(HTML) 6 Page - Silicon Laboratories |
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6 / 20 page  2.4 Choosing the Sense Resistor Selecting the optimal value for the external RSENSE is based on the following criteria and for each commentary follows: 1. RSENSE Voltage Loss 2. VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE 3. Total ILOAD Accuracy 4. Circuit Efficiency and Power Dissipation 5. RSENSE Kelvin Connections 2.4.1 RSENSE Voltage Loss For the lowest IR power dissipation in RSENSE, the smallest usable resistor value for RSENSE should be selected. 2.4.2 VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE As there is no separate power supply pin for the current-sense amplifiers, the circuit draws its power from the voltage at its RS+ and RS- terminals. Therefore, the signal voltage at the OUT terminal is bounded by the minimum voltage applied at the RS+ terminal. Therefore: VOUT (max ) = VRS+(min ) − VSENSE(max ) − VOH (max ) and RSENSE < VOUT (max ) GAIN × ILOAD(max ) where the full-scale VSENSE should be less than VOUT(MAX)/GAIN at the application’s minimum RS+ terminal voltage. For best perform- ance with a 3.6 V power supply, RSENSE should be chosen to generate a VSENSE of: a) 120 mV (for the 25 V/V GAIN option), b) 60 mV (for the 50 V/V GAIN option), c) 30 mV (for the 100 V/V GAIN option), or d) 15 mV (for the 200 V/V GAIN option) at the full-scale ILOAD current in each application. For the case where the minimum power supply voltage is higher than 3.6 V, each of the four full-scale VSENSEs above can be increased. 2.4.3 Total Load Current Accuracy In the current-sense amplifiers’ linear region where VOUT < VOUT(max), there are two specifications related to the circuit’s accuracy: a) the input offset voltage and b) gain error (GE(max) = 0.6%). An expression for the current sense amplifiers’ total error is given by: VOUT = GAIN × (1 ± GE) × VSENSE ± (GAIN × VOS) A large value for RSENSE permits the use of smaller load currents to be measured more accurately because the effects of offset voltag- es are less significant when compared to larger VSENSE voltages. Due care though should be exercised as previously mentioned with large values of RSENSE. 2.4.4 Circuit Efficiency and Power Dissipation IR losses in RSENSE can be large especially at high load currents. It is important to select the smallest, usable RSENSE value to mini- mize power dissipation and to keep the physical size of RSENSE small. If the external RSENSE is allowed to dissipate significant power, then its inherent temperature coefficient may alter its design center value, thereby reducing load current measurement accuracy. Pre- cisely because the current-sense amplifiers input stages were designed to exhibit a very low input offset voltage, small RSENSE values can be used to reduce power dissipation and minimize local hot spots on the PCB. TS1100/01/02/03 Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 5 |
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