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OPA4317-Q1 Datasheet(PDF) 17 Page - Texas Instruments

Part # OPA4317-Q1
Description  Zero-Drift, Low-Offset, Rail-to-Rail I/O Operational Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA4317-Q1 Datasheet(HTML) 17 Page - Texas Instruments

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background image
V+
ILOAD
A1
A2
Q1
Q2
+
+
+
±
VIN
RLOAD
RS1
RS2
RS3
IRS1
IRS2
IRS3
VRS2
VRS3
VRS1
VLOAD
V+
C6
C7
R3
R5
R4
R2
470
4.7
2200 pF
330
10 k
200
1000 pF
10 k
2 k
Copyright © 2016, Texas Instruments Incorporated
17
OPA317-Q1, OPA2317-Q1, OPA4317-Q1
www.ti.com
SLOS914 – JULY 2016
Product Folder Links: OPA317-Q1 OPA2317-Q1 OPA4317-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
9.2 Typical Applications
The circuit shown in Figure 22 is a high-side voltage-to-current (V-I) converter. It translates an input voltage of
0 V to 2 V to an output current of 0 mA to 100 mA. Figure 23 shows the measured transfer function for this
circuit. The low offset voltage and offset drift of the OPA317 facilitate excellent DC accuracy for the circuit.
Figure 22. High-Side Voltage-to-Current (V-I) Converter
9.2.1 Design Requirements
The design requirements are as follows:
Supply Voltage: 5-V DC
Input: 0-V to 2-V DC
Output: 0-mA to 100-mA DC
9.2.2 Detailed Design Procedure
The V-I transfer function of the circuit is based on the relationship between the input voltage, VIN, and the three
current-sensing resistors: RS1, RS2, and RS3. The relationship between VIN and RS1 determines the current that
flows through the first stage of the design. The current gain from the first stage to the second stage is based on
the relationship between RS2 and RS3.


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