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TS1103-50EG6TP データシート(PDF) 8 Page - Touchstone Semiconductor Inc

部品番号 TS1103-50EG6TP
部品情報  A 1關A, 200關VOS Bidirectional Precision Current-Sense Amplifier
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メーカー  TOUCHSTONE [Touchstone Semiconductor Inc]
ホームページ  http://www.touchstonesemi.com
Logo TOUCHSTONE - Touchstone Semiconductor Inc

TS1103-50EG6TP データシート(HTML) 8 Page - Touchstone Semiconductor Inc

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TS1103
Page 8
TS1103DS r1p0
RTFDS
external VSENSE, op amp feedback action drives the
gate of M1 such that M1
’s drain-source current is
equal to:
DS M1
VSE SE
R A A
or
DS M1
L AD x RSE SE
R A A
Since
M1’s drain terminal is connected to ROUT, the
output voltage of the TS1103 at the OUT terminal is,
therefore;
V
L AD x RSE SE x
R
R A A
When the voltage at the RS- terminal is greater than
the voltage at the RS+ terminal, the external
VSENSE voltage drop is impressed upon RGAINB.
The voltage drop across RGAINB is then converted
into a current by M2 that then produces an output
voltage across ROUT. In this design, when M1 is
conducting current (VRS+ > VRS-), the TS1103’s
internal amplifier holds M2 OFF. When M2 is
conducting current
(VRS- > VRS+), the internal
amplifier holds M1 OFF. In either case, the disabled
FET does not contribute to the resultant output
voltage.
The current-
sense amplifier’s gain accuracy is
therefore the ratio match of ROUT to RGAIN[A/B].
For each of the four gain options available, Table 1
lists the values for ROUT and RGAIN[A/B]. The
TS1103
’s output stage is protected against input
overdrive by use of an output current-limiting circuit
of 3mA (typical) and a 7V internal clamp protection
circuit.
Table 1: Internal Gain Setting Resistors (Typical
Values)
GAIN (V/V)
RGAIN[A/B] (
Ω)
ROUT (
Ω)
Part Number
25
400
10k
TS1103-25
50
200
10k
TS1103-50
100
100
10k
TS1103-100
200
100
20k
TS1103-200
The SIGN Comparator Output
As
shown in the S1103’s block diagram, the design
of the TS1103 incorporated one additional feature
an analog comparator the inputs of which monitor
the internal amplifier’s differential output voltage.
While the voltage at the TS1103
’s
terminal
indicates the magnitude of the load current, the
TS1103
’s S
output indicates the load current’s
direction. The SIGN output is a logic high when M1
is conducting current (VRS+ > VRS-). Alternatively, the
SIGN output is a logic low when M2 is conducting
current (VRS+ < VRS-).
he S
comparator’s
transfer characteristic is illustrated in Figure 1.
Unlike other current-sense amplifiers that implement
a OUT/SIGN arrangement, the TS1103 exhibits no
“dead zone” at
LOAD switchover.
Figure 1: TS1103's SIGN Comparator Transfer
Characteristic.
Figure 2: SIGN Comparator Propagation Delay vs VSENSE.
100
0.1
10
1
VSENSE (│VRS+ - VRS-│) - mV
0.1
1
10
100


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