INA203A BURR-BROWN [Burr-Brown Corporation], INA203A Datasheet - Page 11

• Manufacturer Part Number: INA203A
• Description: Unidirectional Measurement Current-Shunt Monitor with Dual Comparators
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

BASIC CONNECTIONS
Figure 30
INA203, INA204, and INA205. The input pins, V
and V
to the shunt resistor to minimize any resistance in
series with the shunt resistance.
Power-supply bypass capacitors are required for
stability. Applications with noisy or high-impedance
power supplies may require additional decoupling
capacitors to reject power-supply noise. Connect
bypass capacitors close to the device pins.
POWER SUPPLY
The input circuitry of the INA203, INA204, and
INA205
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
voltage range of the OUT terminal, however, is
limited by the voltages on the power-supply pin.
ACCURACY VARIATIONS AS A RESULT OF
V
The accuracy of the INA203, INA204, and INA205
current shunt monitors is a function of two main
variables: V
voltage, V
is expressed as (V
V
voltage drop across V
CM
SENSE
www.ti.com
is seen as the voltage at V
IN–
-18V to +80V
AND COMMON-MODE VOLTAGE
Load Supply
, should be connected as closely as possible
can
Monitor Output
CM
Current Shunt
C
0.01 F
BYPASS
SENSE
shows the basic connections of the
, relative to the supply voltage, V
m
accurately
(V
IN+
IN+
SENSE
+ V
CMP1 IN /0.6 REF
CMP2 IN /0.6 REF
– V
IN–
is usually small.
)/2; however, in practice,
IN–
CMP1 IN+
CMP2 IN+
measure
-
-
) and common-mode
GND
OUT
V
S
IN+
Figure 30. INA20x Basic Connection
APPLICATIONS INFORMATION
beyond
because the
1.2V REF
INA203
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S
. V
x20
the
IN+
CM
Transparent/Reset
V
V
1.2V REF OUT
CMP1 OUT
CMP2 OUT
CMP2 DELAY
CMP1
IN+
IN-
RESET
This section addresses the accuracy of these
specific operating regions:
Normal Case 1: V
This region of operation provides the highest
accuracy.
characterized and measured using a two-step
method. First, the gain is determined by
where:
V
V
Then the offset voltage is measured at V
100mV and referred to the input (RTI) of the current
shunt monitor, as shown in
V RTI (Referred-To-Input) =
G =
OUT1
OUT2
OS
Normal Case 1: V
Normal Case 2: V
Low V
< 0
Low V
V
Low V
80V
S
100mV
V
= Output Voltage with V
= Output Voltage with V
R
OUT1
3mW
SHUNT
Latch
SENSE
SENSE
SENSE
-
Here,
-
Optional Delay
Capacitor
0.2 F
V
20mV
OUT2
m
Case 1: V
Case 2: V
Case 3: V
R
4.7kW
SENSE
PULL-UP
the
SENSE
SENSE
SENSE
SENSE
SENSE
input
20mV, V
R
4.7kW
Equation
PULL-UP
20mV, V
20mV, V
SENSE
SENSE
V
< 20mV, –16V
< 20mV, 0V
< 20mV, V
OUT1
G
offset
SBOS393 – MARCH 2007
CM
= 100mV
= 20mV
2.
CM
CM
Load
5V Supply
- 100mV
V
Equation
< V
S
voltage
V
S
S
S
INA203
INA204
INA205
< V
SENSE
V
CM
CM
V
1.
CM
(1)
(2)
11
is
=