Texas Instruments INA241EVM Manual de usuario

User’s Guide

INA241EVM

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the INA241EVM evaluation module (EVM).

This EVM is designed to evaluate the performance of the INA241A or INA241B 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 INA241EVM. This document also includes a schematic, reference printed

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

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INA241EVM 1

Table of Contents

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

2 Overview..................................................................................................................................................................................4

2.1 EVM Kit Contents...............................................................................................................................................................4

2.2 Related Documentation From Texas Instruments.............................................................................................................. 4

3 Hardware................................................................................................................................................................................. 5

3.1 Features............................................................................................................................................................................. 5

4 Operation.................................................................................................................................................................................6

4.1 Quick Start Setup............................................................................................................................................................... 6

4.2 Measurements................................................................................................................................................................... 6

5 EVM Components................................................................................................................................................................... 7

5.1 R1_n, R2_n, R3_n, C2_n, C5_n........................................................................................................................................ 7

5.2 C1_n...................................................................................................................................................................................7

5.3 R4_n...................................................................................................................................................................................7

5.4 U1_n (INA241x)................................................................................................................................................................. 7

6 Schematic, PCB Layout, and Bill of Materials......................................................................................................................8

6.1 Schematic.......................................................................................................................................................................... 8

6.2 PCB Layout........................................................................................................................................................................ 9

6.3 Bill of Materials................................................................................................................................................................. 11

List of Figures

Figure 6-1. INA241EVM Schematic: Gain Option 1 Panel.......................................................................................................... 8

Figure 6-2. INA241EVM Top Overlay.......................................................................................................................................... 9

Figure 6-3. INA241EVM Bottom Overlay.....................................................................................................................................9

Figure 6-4. INA241EVM Top Layer..............................................................................................................................................9

Figure 6-5. INA241EVM Bottom Layer........................................................................................................................................ 9

Figure 6-6. INA241EVM Top Solder.......................................................................................................................................... 10

Figure 6-7. INA241EVM Bottom Solder.....................................................................................................................................10

Figure 6-8. INA241EVM Drill Drawing....................................................................................................................................... 10

List of Tables

Table 2-1. INA241x Gain Option Summary..................................................................................................................................4

Table 2-2. INA241EVM Kit Contents............................................................................................................................................4

Table 2-3. Related Documentation.............................................................................................................................................. 4

Table 6-1. Bill of Materials..........................................................................................................................................................11

Trademarks

All trademarks are the property of their respective owners.

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

Guidelines

WARNING

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.

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.

www.ti.com General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

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INA241EVM 3

2 Overview

The INA241x device is a voltage-output, high-side current sense amplifier in a small SOT-23 (8) package with

enhanced common-mode PWM rejection and bandwidth of 1 Mhz for all gain options. As shown in Gain Option

Summary, the INA241x has gains that range from 10 V/V to 200 V/V, depending on the gain option that is

selected. The device is in preview mode and only the following options of INA241A1, INA241A2 and INA241A3

are populated on this EVM at this time. 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 –4-V to +110-V common-mode 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 2.5 mA at room temperature.

Table 2-1. INA241x Gain Option Summary

Product(1) Gain (V/V)

INA241A1 10

INA241A2 20

INA241A3 50

INA241A4 (Not Installed) 100

INA241A5 (Not Installed) 200

(1) INA241x is a preview device.

2.1 EVM Kit Contents

Table 2-2 summarizes the contents of the INA241EVM kit. Contact the nearest Texas Instruments Product

Information Center if any component is missing. TI also recommends to check the device product folders at

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

Table 2-2. INA241EVM Kit Contents

Item Item Part Number Quantity

INA241AEVM test board INA241AEVM

2.2 Related Documentation From Texas Instruments

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

INA241EVM.

Table 2-3. Related Documentation

Document Literature Number

INA241A and INA241B product data

sheet

SBOSA30

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3 Hardware

The INA241EVM provides a basic functional evaluation of the INA241x. 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 INA241EVM 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 2-1. Each PCB cutout has one INA241n device (where n is 1, 2, 3, 4, or 5), test points and sockets for

external hardware connections, and pads to solder down optional circuitry. Only gain options A1, A2, and A3 are

populated.

3.1 Features

The INA241EVM 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 10 A.

See the device data sheets for comprehensive information about the INA241EVM and the available gain options.

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INA241EVM 5

4 Operation

4.1 Quick Start Setup

Follow these procedures to set up and use one of the INA241EVM panels. For these instructions, n is gain

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

1. Choose the desired gain option panel variation.

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.

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

J1_n and J2_n on the EVM, as explained in Section 4.2. The IN241x is a bidirectional current-sensing device

that has a reference pin. With this reference pin, the device can measure current in both directions. To use

1/2 of the supply voltage (VS) as the reference, place shorting bars on jumper J4, connect REF1 to VS and

J5, and connect REF2 to GND. If you only want to measure unidirectional current, be careful not to short VS

to GND. Remove the jumpers from J4 and J5 before placing a jumper on J6. After J6 shorts Ref1 to Ref2,

place one jumper on J4 or J5 or drive the Ref1 and Ref2 pins to create your own reference voltage.

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 INA241EVM, or connect the device inputs to an external shunt. The user can also solder a

surface-mount technology (SMT) shunt resistor across the In+ and In– 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 differential voltage across the In+ (J1_n) and In– (J2_n) tabs.

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 In– (J1_n) tab and source ground to

a GND test point. The minimum common-mode voltage should be > -4V. This action effectively raises the

absolute common-mode voltage of the input pins.

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 In+ (J1_n) and In– (J1_n) inputs.

2. Connect the In+ (J1_n) and In– (J2_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 10 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. If bidirectional, use

voltage is referenced to VS/2. If unidirectional, the ouput is refrenced to voltage applied at Ref1 and Ref2.

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5 EVM Components

This section summarizes the INA241EVM components. For these instructions, n is gain option 1, 2, 3, 4, or 5.

5.1 R1_n, R2_n, R3_n, C2_n, C5_n

R1_n, R2_n, and R3_n are factory-installed 0-Ω 0603 resistors.

C2_n and C5_n, are not populated.

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

INA241x. If a filter is desired, remove these resistors and replace them with > 0-Ω SMT resistors and populate

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

5.2 C1_n

C1_n is a 0.1-µF, power-supply bypass capacitor.

5.3 R4_n

R4_n is unpopulated, but allows the user to solder down a surface-mount shunt resistor between the In+ and In–

pads sensed by IN+ and IN– input pins. If used, make sure R4_n has proper power dissipation for the selected

current load. The chosen resistor must have a 2512 footprint.

5.4 U1_n (INA241x)

U1_n is the location for the INA241An 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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INA241EVM 7

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 INA241EVM PCB manufacturing.

6.1 Schematic

Figure 6-1 shows the schematic for one of the gain panels on the INA241EVM PCB. All other panels will have

reference designators as subscript "_x" where "x" is the gain option.

Figure 6-1. INA241EVM Schematic: Gain Option 1 Panel

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6.2 PCB Layout

Figure 6-2 through Figure 6-8 show the PCB layout for the INA241EVM.

Figure 6-2. INA241EVM Top Overlay Figure 6-3. INA241EVM Bottom Overlay

Figure 6-4. INA241EVM Top Layer Figure 6-5. INA241EVM Bottom Layer

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INA241EVM 9

Figure 6-6. INA241EVM Top Solder Figure 6-7. INA241EVM Bottom Solder

Figure 6-8. INA241EVM Drill Drawing

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