Texas Instruments INA290EVM Manuale utente

SBOU230–October 2019

INA290EVM

User's Guide

SBOU230–October 2019

INA290EVM

This user’s guide describes the characteristics, operation, and use of the INA290 evaluation module

(EVM). This EVM is designed to evaluate the performance of the INA290 voltage-output, current shunt

monitor in a variety of configurations. Throughout this document, the terms evaluation board, evaluation

module, and EVM are synonymous with the INA290EVM. This document also includes a schematic,

reference printed-circuit board (PCB) layouts, and a complete bill of materials (BOM).

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Contents

1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines ...................... 3

2 Overview...................................................................................................................... 5

2.1 EVM Kit Contents................................................................................................... 5

2.2 Related Documentation From Texas Instruments.............................................................. 5

3 Hardware ..................................................................................................................... 6

3.1 Features ............................................................................................................. 6

4 Operation ..................................................................................................................... 7

4.1 Quick Start Setup................................................................................................... 7

4.2 Measurements ...................................................................................................... 7

5 EVM Components ........................................................................................................... 8

5.1 R2_An, R3_An, R4_An, C2_An, C3_An ........................................................................ 8

5.2 C1_An ............................................................................................................... 8

5.3 R1_An ............................................................................................................... 8

5.4 U1_An (INA290) .................................................................................................... 8

6 Schematic, PCB Layout, and Bill of Materials ........................................................................... 9

6.1 Schematics .......................................................................................................... 9

6.2 PCB Layout ........................................................................................................ 14

6.3 Bill of Materials .................................................................................................... 16

List of Figures

1 INA290EVM Schematic: Gain A1 Panel ................................................................................. 9

2 INA290EVM Schematic: Gain A2 Panel ................................................................................ 10

3 INA290EVM Schematic: Gain A3 Panel ................................................................................ 11

4 INA290EVM Schematic: Gain A4 Panel ................................................................................ 12

5 INA290EVM Schematic: Gain A5 Panel ................................................................................ 13

6 INA290EVM Top Overlay ................................................................................................. 14

7 INA290EVM Bottom Overlay ............................................................................................. 14

8 INA290EVM Top Layer.................................................................................................... 14

9 INA290EVM Bottom Layer ............................................................................................... 14

10 INA290EVM Top Solder .................................................................................................. 14

11 INA290EVM Bottom Solder .............................................................................................. 14

12 INA290EVM Drill Drawing................................................................................................. 15

List of Tables

1 INA290 Gain Option Summary............................................................................................. 5

2 INA290EVM Kit Contents................................................................................................... 5

3 Related Documentation..................................................................................................... 5

4 Bill of Materials ............................................................................................................. 16

Trademarks

All trademarks are the property of their respective owners.

WARNING

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General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

SBOU230–October 2019

INA290EVM

1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

Always follow TI’s setup and application instructions, including use of all interface components within their

recommended electrical rated voltage and power limits. Always use electrical safety precautions to help

ensure your personal safety and those working around you. Contact TI's Product Information Center

http://support/ti./com for further information.

Save all warnings and instructions for future reference.

WARNING

Failure to follow warnings and instructions may result in personal injury,

property damage or death due to electrical shock and burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed

printed circuit board assembly. It is intended strictly for use in development laboratory environments,

solely for qualified professional users having training, expertise and knowledge of electrical safety risks in

development and application of high voltage electrical circuits. Any other use and/or application are strictly

prohibited by Texas Instruments. If you are not suitable qualified, you should immediately stop from further

use of the HV EVM.

1. Work Area Safety

a. Keep work area clean and orderly.

b. Qualified observer(s) must be present anytime circuits are energized.

c. Effective barriers and signage must be present in the area where the TI HV EVM and its interface

electronics are energized, indicating operation of accessible high voltages may be present, for the

purpose of protecting inadvertent access.

d. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other

related apparatus used in a development environment exceeding 50Vrms/75VDC must be

electrically located within a protected Emergency Power Off EPO protected power strip.

e. Use stable and nonconductive work surface.

f. Use adequately insulated clamps and wires to attach measurement probes and instruments. No

freehand testing whenever possible.

2. Electrical Safety

As a precautionary measure, it is always a good engineering practice to assume that the entire EVM

may have fully accessible and active high voltages.

a. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any

electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely

de-energized.

b. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,

wiring, measurement equipment connection, and other application needs, while still assuming the

EVM circuit and measuring instruments are electrically live.

c. After EVM readiness is complete, energize the EVM as intended.

WARNING

While the EVM is energized, never touch the EVM or its electrical

circuits, as they could be at high voltages capable of causing electrical

shock hazard.

General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

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3. Personal Safety

a. Wear personal protective equipment (for example, latex gloves or safety glasses with side shields)

or protect EVM in an adequate lucent plastic box with interlocks to protect from accidental touch.

Limitation for safe use:

EVMs are not to be used as all or part of a production unit.

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Overview

SBOU230–October 2019

INA290EVM

2 Overview

The INA290-Q1 device is a voltage-output, high-side current sense amplifier with an enable pin in a very-

small SC-70 (5) package. As shown in Table 1, the INA290 has gains that range from 20 V/V to 500 V/V,

depending on the gain option that is selected. The voltage developed across the device inputs is amplified

by the corresponding gain of the specific device, and is presented at the output pin. The device can

accurately sense voltage drops across shunts at 2.7-V to +110-V common-mode voltages, dependent of

supply voltages.The device survives common-mode voltages from –20 V to +120 V. The device operates

with supply voltages between 2.7 V and 20 V, and draws a typical of 350 µA at room temperature.

(1) INA290B-Q1 is a preview device.

Table 1. INA290 Gain Option Summary

Product(1) Gain (V/V)

INA290A1 20

INA290A2 50

INA290A3 100

INA290A4 200

INA290A5 500

2.1 EVM Kit Contents

Table 2 summarizes the contents of the INA290EVM kit. Contact the nearest Texas Instruments Product

Information Center if any component is missing. TI also recommends to check the INA290-Q1 device

product folder at www.ti.com for any further information regarding this product.

Table 2. INA290EVM Kit Contents

Item Item Part Number Quantity

INA290EVM test board INA290EVM 1

2.2 Related Documentation From Texas Instruments

This document provides information regarding Texas Instruments' integrated circuits used in the assembly

of the INA290EVM.

Table 3. Related Documentation

Document Literature Number

INA290-Q1 product data sheet SBOS955

Hardware

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3 Hardware

The INA290EVM provides a basic functional evaluation of the INA290. The fixture layout is not intended to

be a model for the target circuit, nor is it laid out for electromagnetic compatibility (EMC) testing. The

INA290EVM is one PCB with five optional PCB cutouts the engineer can use to test each of the five gain

options (1 to 5) listed in Table 1. Each PCB cutout has one INA290ndevice (where nis 1, 2, 3, 4, or 5),

test points and sockets for external hardware connections, and pads to solder down optional circuitry.

3.1 Features

The INA290EVM PCB provides the following features:

• Evaluation of all gain options through provided device boards

• Ease of access to device pins with test points

• Pads and sockets for optional filtering at the input pins and output pin

• Multiple input signal options, including a method to solder a shunt resistor (2512) and safely measure

current up to 5 A.

See the device data sheet for comprehensive information about the INA290 and the available gain

options.

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Operation

SBOU230–October 2019

INA290EVM

4 Operation

4.1 Quick Start Setup

Follow these procedures to set up and use one of the INA290EVM panels. For these instructions, n is gain

option 1, 2, 3, 4, or 5.

Step 1. Choose the desired gain option panel variation.

Step 2. Connect an external DC supply voltage (between 2.7 V and 20 V) to a VS test point. Connect

the ground reference of that supply to a GND test point on the same panel.

Step 3. Provide a differential input voltage signal to the Vin+ and Vin– nodes by connecting the signal

leads to the J1_n pin 1 and J1_n pin 2 on the EVM, as explained in Section 4.2. The INA290

is a unidirectional current-sensing device because there is no reference pin. The device can

only measure current in one direction.

4.2 Measurements

The user can either emulate the voltage developed across a sense resistor based on a given set of

system conditions with the INA290EVM, or connect the device inputs to an external shunt. The user can

also solder a surface-mount technology (SMT) shunt resistor across the Vin+ and Vin– pads, and these

inputs can be connected in series with the external system and load.

To configure a measurement evaluation without a shunt resistor, follow this procedure:

1. Connect a positive differential voltage across the Vin+ (J1_n) and Vin– (J1_n) tabs. Given the

internal GND reference of the device, make sure that the Vin+ pin is the more positive of the two

inputs.

2. Connect a 2.7-V to 110-V common-mode voltage to the inputs if the differential voltage supply is a

floating supply. Connect the positive lead of the external voltage source to the Vin– (J1_n) tab and

source ground to a GND test point. The minimum common-mode voltage should be >VS. This

action effectively raises the absolute common-mode voltage of the input pins, while still retaining a

positive input differential signal.

3. Measure the output voltage at the Vout test point with respect to GND.

To configure a measurement evaluation with a shunt resistor, follow this procedure:

1. Solder a 2512 resistor at the R1_n pads that connects the Vin+ (J1_n) and Vin– (J1_n) inputs.

2. Connect the Vin+ (J1_n) and Vin– (J1_n) tabs in series with the load and bus voltage sources while

powered off.

WARNING

Make sure that the equipment (shunt resistor, wires, connectors,

and so on) can support the amperage and power dissipation

first before you measure the current. Also make sure that the

current flowing through J1 does not exceed 5 A. Failure to do so

can result in hot surfaces (> 55°C), damage to the EVM, or

personal injury.

3. Power on the system and measure the output voltage at the Vout test point. Vout is equal to the

gain of the device multiplied by the differential voltage measured directly at the device input pins.

EVM Components

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5 EVM Components

This section summarizes the INA290EVM components. For these instructions, n is gain option 1, 2, 3, 4,

or 5.

5.1 R2_An, R3_An, R4_An, C2_An, C3_An

R2_An, R3_An, R4_An, are factory-installed 0-Ω0603 resistors.

C2_An, C3_An, are not populated.

Collectively, these pads allow user-defined filters for the input pins (IN+ and IN–) and the output pin (OUT)

of the INA290. If a filter is desired, remove these resistors and replace them with > 0-ΩSMT resistors and

populate the capacitor pads with capacitors. Consider the input bias current of the device when using

input filtering.

5.2 C1_An

C1_An is a 0.1-µF, power-supply bypass capacitor.

5.3 R1_An

R1_An is unpopulated, but allows the user to solder down a surface-mount shunt resistor between the

Vin+ and Vin– pads sensed by IN+ and IN– input pins. If used, make sure R1_An has proper power

dissipation for the selected current load. The chosen resistor must have a 2512 footprint.

5.4 U1_An (INA290)

U1_An is the location for the INA290An test device.

Consider these factors when selecting the appropriate device gain:

• The differential input voltage is either applied across the inputs or developed based on the load current

that flows through the shunt resistor.

• Make sure that the output voltage does not exceed the supply voltage. This limiting factor requires

attention to device selection.

• The selected device must allow the output voltage to remain within the acceptable range after the

developed input voltage is amplified by the respective device gain. The output voltage must remain

within the device-specified swing limitations for response in the linear range.

• An output below the minimum allowable output requires a device with a higher gain. Likewise, an

output above the maximum allowable output requires a device with a lower gain.

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Schematic, PCB Layout, and Bill of Materials

SBOU230–October 2019

INA290EVM

6 Schematic, PCB Layout, and Bill of Materials

NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out. They are not intended to be used for

INA290EVM PCB manufacturing.

6.1 Schematics

Figure 1 through Figure 5 show the schematics for the A pinout of the INA290EVM PCB for all gain options.

Figure 1. INA290EVM Schematic: Gain A1 Panel

Schematic, PCB Layout, and Bill of Materials

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Figure 2. INA290EVM Schematic: Gain A2 Panel

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