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TSM9938 Datasheet(PDF) 10 Page - Touchstone Semiconductor Inc

Part No. TSM9938
Description  A 1uA, SOT23 Precision Current-Sense Amplifier
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Manufacturer  TOUCHSTONE [Touchstone Semiconductor Inc]
Direct Link  http://www.touchstonesemi.com
Logo TOUCHSTONE - Touchstone Semiconductor Inc

TSM9938 Datasheet(HTML) 10 Page - Touchstone Semiconductor Inc

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TSM9938
Page 10
TSM9938DS r1p0
RTFDS
RS+/RS- input pair of TSM9938 #2 is wired opposite
in polarity with respect to the RS+/RS- connections
of TSM9938 #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.
PC Board Layout and Power-Supply Bypassing
For optimal circuit performance, the TSM9938
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 TSM9938 should be short and symmetric. Also
recommended are a ground plane and surface
mount resistors and capacitors.


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