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INA205AIDGSTG4 Datasheet(PDF) 11 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # INA205AIDGSTG4
Description  Unidirectional Measurement Current-Shunt Monitor with Dual Comparators
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

INA205AIDGSTG4 Datasheet(HTML) 11 Page - Burr-Brown (TI)

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APPLICATIONS INFORMATION
BASIC CONNECTIONS
Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS
POWER SUPPLY
G=
V
V
-
OUT1
OUT2
100mV
20mV
-
(1)
ACCURACY VARIATIONS AS A RESULT OF
V
RTI(Referred-To-Input)=
OS
V
OUT1
G
- 100mV
(2)
INA203
x20
R
SHUNT
3mW
LoadSupply
-
18Vto+80V
Load
5VSupply
OptionalDelay
Capacitor
0.2 F
m
C
BYPASS
0.01 F
m
V
S
OUT
CMP1IN /0.6REF
-
CMP1IN+
CMP2IN+
CMP2IN /0.6REF
-
GND
V
IN+
V
IN-
1.2VREFOUT
CMP1OUT
CMP2OUT
CMP2DELAY
CMP1 RESET
CurrentShunt
MonitorOutput
1.2VREF
R
PULL-UP
4.7kW
R
PULL-UP
4.7kW
Transparent/Reset
Latch
INA203
INA204
INA205
SBOS393 – MARCH 2007
This section addresses the accuracy of these
specific operating regions:
• Normal Case 1: V
SENSE ≥ 20mV, VCM ≥ VS
Figure 30 shows the basic connections of the
• Normal Case 2: V
SENSE ≥ 20mV, VCM < VS
INA203, INA204, and INA205. The input pins, VIN+
and VIN–, should be connected as closely as possible
• Low V
SENSE Case 1: VSENSE < 20mV, –16V ≤ VCM
to the shunt resistor to minimize any resistance in
< 0
series with the shunt resistance.
• Low V
SENSE Case 2: VSENSE < 20mV, 0V ≤ VCM
VS
Power-supply bypass capacitors are required for
• Low V
SENSE Case 3: VSENSE < 20mV, VS < VCM
stability. Applications with noisy or high-impedance
80V
power supplies may require additional decoupling
capacitors to reject power-supply noise. Connect
bypass capacitors close to the device pins.
This
region
of
operation
provides
the
highest
accuracy.
Here,
the
input
offset
voltage
is
characterized
and
measured
using
a
two-step
The input circuitry of the INA203, INA204, and
method. First, the gain is determined by Equation 1.
INA205
can
accurately
measure
beyond
the
power-supply voltage, V+. For example, the V+
power
supply
can
be
5V,
whereas
the
load
power-supply voltage is up to +80V. The output
where:
voltage range of the OUT terminal, however, is
limited by the voltages on the power-supply pin.
VOUT1 = Output Voltage with VSENSE = 100mV
VOUT2 = Output Voltage with VSENSE = 20mV
V
SENSE AND COMMON-MODE VOLTAGE
Then the offset voltage is measured at VSENSE =
100mV and referred to the input (RTI) of the current
The accuracy of the INA203, INA204, and INA205
shunt monitor, as shown in Equation 2.
current shunt monitors is a function of two main
variables: VSENSE (VIN+ – VIN–) and common-mode
voltage, VCM, relative to the supply voltage, VS. VCM
is expressed as (VIN+ + VIN–)/2; however, in practice,
VCM is seen as the voltage at VIN+ because the
voltage drop across VSENSE is usually small.
Figure 30. INA20x Basic Connection
11
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