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TS1102-200EG5T Scheda tecnica(PDF) 10 Page - Touchstone Semiconductor Inc |
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TS1102-200EG5T Scheda tecnica(HTML) 10 Page - Touchstone Semiconductor Inc |
10 / 11 page TS1102 Page 10 TS1102DS r1p0 RTFDS low-pass filters in series with the current-sense amplifier’s inputs only introduces additional offset voltage and gain errors. To minimize or eliminate altogether the need for external low-pass filters and to maintain low input offset voltage and gain errors, the TS1102 incorporates a 50-kHz (typ), 2 nd-order differential low-pass filter as shown in the TS1102 ’s Block Diagram. Optional Output Filter Capacitor If the TS1102 is part of a signal acquisition system where its OUT terminal is connected to the input of an ADC with an internal, switched-capacitor track- and-hold circuit, the internal track-and- hold’s sampling capacitor can cause voltage droop at VOUT. A 22nF to 100nF good-quality ceramic capacitor from the OUT terminal to GND forms a low-pass filters with the TS1102 ’s R OUT and should be used to minimize voltage droop (holding VOUT constant during the sample interval. Using a capacitor on the OUT terminal will also reduce the TS1102 ’s small- signal bandwidth as well as band-limiting amplifier noise. PC Board Layout and Power-Supply Bypassing For optimal circuit performance, the TS1102 should be in very close proximity to the external current- sense resistor and the pcb tracks from RSENSE to the RS+ and the RS- input terminals of the TS1102 should be short and symmetric. Also recommended are a ground plane and surface mount resistors and capacitors. Using the TS1102 in Bidirectional Load Current Applications In many battery-powered systems, it is oftentimes necessary to monitor a battery’s discharge and charge currents. To perform this function, a bidirectional current-sense amplifier is required. The circuit illustrated in Figure 2 shows how two TS1102s can be configured as a bidirectional current-sense amplifier. As shown in the figure, the RS+/RS- input pair of TS1102 #2 is wired opposite in polarity with respect to the RS+/RS- connections of TS1102 #1. Current-sense amplifier #1 therefore measures the discharge current and current-sense amplifier #2 measures the charge current. Note that both output voltages are measured with respect to GND. When the discharge current is being measured, VOUT1 is active and VOUT2 is zero; for the case where charge current is being measured, VOUT1 is zero, and VOUT2 is active. Figure 2: Using Two TS1102s for Bidirectional Load Current Detection |
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