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OPA2388IDR Datasheet(PDF) 19 Page - Texas Instruments

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Part No. OPA2388IDR
Description  Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail Input/Output, Operational Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA2388IDR Datasheet(HTML) 19 Page - Texas Instruments

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Gain
=
Diff_Amp
V
V
= 15.5
V
V
R
(I
I
)
OUT_Max
OUT_Min
SHUNT
MAX
MIN
-
-
´
3.2 V
100 mV
100 m
-
W ´
- -
[1 A
( 1A)]
=
R
=
SHUNT(Max)
=
= 100 mW
V
I
SHUNT(Max)
LOAD(Max)
100 mV
1 A
V
= V
REF
CC
´
R
R
R
6
5
6
+
Gain
=
Diff_Amp
R
R
4
3
V
= I
R
SHUNT
LOAD
´
SHUNT
V
= V
Gain
+ V
OUT
SHUNT
Diff_Amp
REF
´
19
OPA388, OPA2388, OPA4388
www.ti.com
SBOS777 – DECEMBER 2016
Product Folder Links: OPA388 OPA2388 OPA4388
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
Typical Application (continued)
8.2.1 Design Requirements
This solution has the following requirements:
Supply voltage: 3.3 V
Input: –1 A to 1 A
Output: 1.65 V ±1.54 V (110 mV to 3.19 V)
8.2.2 Detailed Design Procedure
The load current, ILOAD, flows through the shunt resistor (RSHUNT) to develop the shunt voltage, VSHUNT. The shunt
voltage is then amplified by the difference amplifier consisting of U1A and R1 through R4. The gain of the
difference amplifier is set by the ratio of R4 to R3. To minimize errors, set R2 = R4 and R1 = R3. The reference
voltage, VREF, is supplied by buffering a resistor divider using U1B. The transfer function is given by Equation 1.
where
(1)
There are two types of errors in this design: offset and gain. Gain errors are introduced by the tolerance of the
shunt resistor and the ratios of R4 to R3 and, similarly, R2 to R1. Offset errors are introduced by the voltage
divider (R5 and R6) and how closely the ratio of R4 / R3 matches R2 / R1. The latter value affects the CMRR of the
difference amplifier, ultimately translating to an offset error.
The value of VSHUNT is the ground potential for the system load because VSHUNT is a low-side measurement.
Therefore, a maximum value must be placed on VSHUNT. In this design, the maximum value for VSHUNT is set to
100 mV. Equation 2 calculates the maximum value of the shunt resistor given a maximum shunt voltage of
100 mV and maximum load current of 1 A.
(2)
The tolerance of RSHUNT is directly proportional to cost. For this design, a shunt resistor with a tolerance of 0.5%
was selected. If greater accuracy is required, select a 0.1% resistor or better.
The load current is bidirectional; therefore, the shunt voltage range is –100 mV to 100 mV. This voltage is divided
down by R1 and R2 before reaching the operational amplifier, U1A. Take care to ensure that the voltage present
at the noninverting node of U1A is within the common-mode range of the device. Therefore, use an operational
amplifier, such as the OPA388, that has a common-mode range that extends below the negative supply voltage.
Finally, to minimize offset error, note that the OPA388 has a typical offset voltage of merely ±0.25 µV (±5 µV
maximum).
Given a symmetric load current of –1 A to 1 A, the voltage divider resistors (R5 and R6) must be equal. To be
consistent with the shunt resistor, a tolerance of 0.5% was selected. To minimize power consumption,
10-kΩ resistors were used.
To set the gain of the difference amplifier, the common-mode range and output swing of the OPA388 must be
considered. Equation 3 and Equation 4 depict the typical common-mode range and maximum output swing,
respectively, of the OPA388 given a 3.3-V supply.
–100 mV < VCM < 3.4 V
(3)
100 mV < VOUT < 3.2 V
(4)
The gain of the difference amplifier can now be calculated as shown in Equation 5.
(5)


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