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TS1101-50EG6TP Fiches technique(PDF) 7 Page - Touchstone Semiconductor Inc

No de pièce TS1101-50EG6TP
Description  A 1uA, 2V to 25V Bidirectional Precision Current-Sense Amplifier
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Fabricant  TOUCHSTONE [Touchstone Semiconductor Inc]
Site Internet  http://www.touchstonesemi.com
Logo TOUCHSTONE - Touchstone Semiconductor Inc

TS1101-50EG6TP Fiches technique(HTML) 7 Page - Touchstone Semiconductor Inc

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TS1101
TS1101DS r1p0
Page 7
RTFDS
PIN FUNCTIONS
PIN
LABEL
FUNCTION
1
GND
Ground. Connect this pin to analog ground.
2
SIGN
Comparator Output, push-pull; SIGN is HIGH for (VRS+ > VRS-) and LOW for (VRS- > VRS+).
3
OUT
Output Voltage. VOUT is proportional to VSENSE = (VRS+ - VRS-) or (VRS- - VRS+).
4
RS-
External Sense Resistor Load-Side Connection
5
VDD
SIGN Comparator External Power Supply P
in; Connect this pin to system’s logic VDD supply.
6
RS+
External Sense Resistor Power-Side Connection
BLOCK DIAGRAM
DESCRIPTION OF OPERATION
The internal configuration of the TS1101
– a
bidirectional high-side, current-sense amplifier
– is a
variation of the TS1100 uni-directional current-sense
amplifier. In the design of the TS1101, the input
amplifier
was
reconfigured
for
fully
differential
input/output operation and a second low-threshold p-
channel FET (M2) was added where the drain
terminal of
M2
is
also
connected
to
ROUT.
Therefore, the behavior of the TS1101 for when
VRS- > VRS+ is identical for when VRS+ > VRS-.
Referring to the typical application circuit on Page 1,
the inputs of
the TS1101’s differential input/output
amplifier are connected across an external RSENSE
resistor that is used to measure current. At the non-
inverting input of the TS1101 (the RS- terminal), the
applied voltage is ILOAD x RSENSE. Since the RS-
terminal is the non-inverting input of the internal op
amp, op amp feedback action forces the inverting
input of the internal op amp to the same potential
(ILOAD x RSENSE). Therefore, the voltage drop
across RSENSE (VSENSE = VRS+ - VRS-) and the
voltage drop across RGAINA (at the RS+ terminal)
are equal. Necessary for gain ratio match, both
RGAINA and RGAINB are the same value.
Since p-channel
M1’s source is connected to the
inverting input of the internal op amp and since the
voltage drop across RGAINA is the same as the


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