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TS1100-25 Datasheet(PDF) 9 Page - Touchstone Semiconductor Inc

No. de pieza TS1100-25
Descripción Electrónicos  A 1uA, 2V to 25V SOT23 Precision Current-Sense Amplifier
Download  11 Pages
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Fabricante Electrónico  TOUCHSTONE [Touchstone Semiconductor Inc]
Página de inicio  http://www.touchstonesemi.com
Logo TOUCHSTONE - Touchstone Semiconductor Inc

TS1100-25 Datasheet(HTML) 9 Page - Touchstone Semiconductor Inc

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TS1100
TS1100DS r1p0
Page 9
RTFDS
An expression for the TS1100
’s total output voltage
(+ error) is given by:
VOUT = [GAIN x (1 ± GE) x VSENSE] ± (GAIN x VOS)
A large value for RSENSE permits the use of smaller
load currents to be measured more accurately
because the effects of offset voltages are less
significant
when
compared
to
larger
VSENSE
voltages. Due care though should be exercised as
previously mentioned with large values of RSENSE.
4) Circuit Efficiency and Power Dissipation
IR losses in RSENSE can be large especially at high
load currents. It is important to select the smallest,
usable RSENSE value to minimize power dissipation
and to keep the physical size of RSENSE small. If
the external RSENSE is allowed to dissipate
significant power, then its inherent temperature
coefficient may alter its design center value, thereby
reducing
load
current
measurement
accuracy.
Precisely because the TS1100
’s input stage was
designed to exhibit a very low input offset voltage,
small RSENSE values can be used to reduce power
dissipation and minimize local hot spots on the pcb.
5) RSENSE Kelvin Connections
For optimal VSENSE accuracy in the presence of large
load currents, parasitic pcb track resistance should
be
minimized.
Kelvin-sense
pcb
connections
between RSENSE and the TS1100
’s RS+ and RS-
terminals are strongly recommended. The drawing in
Figure 1 illustrates the connections between the
current-sense
amplifier
and
the
current-sense
resistor. The pcb layout should be balanced and
symmetrical to minimize wiring-induced errors. In
addition, the pcb layout for RSENSE should include
good thermal management techniques for optimal
RSENSE power dissipation.
6) RSENSE Composition
Current-shunt resistors are made available in metal
film, metal strip, and wire-wound constructions.
Wire-wound current-shunt resistors are constructed
with wire spirally wound onto a core. As a result,
these types of current shunt resistors exhibit the
largest self inductance. In applications where the
load current contains high-frequency transients,
metal film or metal strip current sense resistors are
recommended.
Internal Noise Filter
In
power
management
and
motor
control
applications, current-sense amplifiers are required to
measure load currents accurately in the presence of
both externally-generated differential and common-
mode noise. An example of differential-mode noise
that can appear at the inputs of a current-sense
amplifier is high-frequency ripple. High-frequency
ripple
– whether injected into the circuit inductively
or capacitively - can produce a differential-mode
voltage drop across the external current-shunt
resistor
(RSENSE).
An
example
of
externally-
generated,
common-mode
noise
is
the
high-
frequency output ripple of a switching regulator that
can result in common-mode noise injection into both
inputs of a current-sense amplifier.
Even though the load current signal bandwidth is
DC, the input stage of any current-sense amplifier
can rectify unwanted, out-of-band noise that can
result in an apparent error voltage at its output. This
rectification of noise signals occurs because all
amplifier
input
stages
are
constructed
with
transistors that can behave as high-frequency signal
detectors in the same way pn-junction diodes were
used as RF envelope detectors in early radio
designs. Against common-mode injected noise, the
amplifier’s
internal common-mode
rejection
is
usually sufficient.
To counter the effects of externally-injected noise, it
has always been good engineering practice to add
external low-pass filters in series with the inputs of a
current-sense amplifier. In the design of discrete
current-sense
amplifiers,
resistors
used in
the
external low-pass filters were incorporated into the
circuit’s overall design so errors because of any
input-bias current-generated offset voltage errors
and gain errors were compensated.
With
the
advent
of
monolithic
current-sense
amplifiers, like the TS1100, the addition of external
Figure 1: Making PCB Connections to the Sense
Resistor.


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