OPA317-Q1 datasheet(17/29 Pages) TI1

Part #	OPA317-Q1

Description	Zero-Drift, Low-Offset, Rail-to-Rail I/O Operational Amplifier

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Manufacturer	TI1 [Texas Instruments]

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17 / 29 page

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

17

OPA317-Q1, OPA2317-Q1, OPA4317-Q1

www.ti.com

SLOS914 – JULY 2016

Product Folder Links: OPA317-Q1 OPA2317-Q1 OPA4317-Q1

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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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OPA317-Q1 Datasheet(PDF) 17 Page - Texas Instruments

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