AN836 Datasheet, PDF (5/6 Pages) STMicroelectronics – LOW FORWARD VOLTAGE SCHOTTKY DIODE

AN836
2.2. Performance Comparison Results
The results are shown in Table 2 where VSENSE, ILOAD, and VOUT were measured for both devices.
Table 2. TS1100 and MAX9634 Data Sheet Specifications
TS1100-50
MAX9634F
%error = 0.64%
%error = 1.28%
I_LOAD = ±100 mA
R_SENSE = 50m ±1%
V_SENSE = 5 mV
V_OUT(measured) = 248.4 mV
V_OUT(ideal) = 250 mV
I_LOAD = ±100 mA
R_SENSE = 50m ±1%
V_SENSE = 5 mV
V_OUT(measured) = 248.4 mV
V_OUT(ideal) = 250 mV
2.3. Parasitic Resistance Considerations
Because the RSENSE resistor and trace resistances can vary from board to board, each demo board’s ILOAD was
adjusted using its own active load in order to equalize the VSENSE voltage. In a design, it is important to measure
the exact sense resistor value and then calculate the necessary load current while taking into account any small
trace resistances that can affect the load current measurement.
3. Conclusion
Because its input offset voltage is 3 times lower than the MAX9634, the TS1100 exhibits an improved load current
sense accuracy by a factor of 2 over the MAX9634. Available in a pcb-space saving SOT23-5 package, the
TS1100 consumes less than 1µA of supply current, can be used in applications that operate from 2 V to 25 V, and
is available in four gain options: 25, 50, 100, and 200. This makes the TS1100 an ideal solution for load current
measurement in power conscious applications. See documentation on the TS1100 Current-Sense Amplifier and
TS9634 Current-Sense Amplifier. For additional information, contact Silicon Labs.
Rev. 1.0
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