Texas Instruments INA381EVM Manuale utente

SBOU196–December 2017

INA381EVM

All trademarks are the property of their respective owners.

User's Guide

SBOU196–December 2017

INA381EVM

This user’s guide describes the characteristics, operation, and use of the INA381 evaluation module

(EVM). This EVM is designed to evaluate the performance of the INA381A1, INA381A2, INA381A3, and

INA381A4 voltage output current-shunt monitors in a variety of configurations. The EVM also provides an

internal comparator with each of the above devices, and allows the user to define reference voltages for

each device’s alert function. Throughout this document, the terms evaluation board, evaluation module,

and EVM are synonymous with the INA381EVM. This document includes a schematic, reference printed-

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

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INA381EVM

Contents

1 Overview...................................................................................................................... 3

2 Hardware...................................................................................................................... 4

3 Quick Start Setup and Use ................................................................................................. 4

4 Circuitry ....................................................................................................................... 5

5 Schematics, PCB Layout, and Bill of Materials.......................................................................... 6

List of Figures

1 Schematic for A1 Device ................................................................................................... 6

2 Schematic for A2 Device ................................................................................................... 6

3 Schematic for A3 Device ................................................................................................... 7

4 Schematic for A4 Device ................................................................................................... 7

5 Top Overlay .................................................................................................................. 8

6 Top Layer..................................................................................................................... 8

7 Bottom Overlay............................................................................................................... 8

8 Bottom Layer ................................................................................................................. 8

List of Tables

1 INA381Ax Device Summary................................................................................................ 3

2 INA381EVM Kit Contents................................................................................................... 3

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

4 Bill of Materials .............................................................................................................. 9

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Overview

SBOU196–December 2017

INA381EVM

1 Overview

The INA381 family of current-shunt monitors (also called current-sense amplifiers) can sense voltage

drops across shunts at common-mode voltages from –0.3 V to +26 V, independent of the supply voltage.

Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. These devices operate from a

single 2.7-V to 5.5-V power supply, drawing a maximum of 1000 μA of supply current per amplifier

channel. A comparator is included to provide an active low alert signal when the output exceeds a user

defined voltage. The alert function operates in either continuous mode or latch mode to respectively

indicate whether a certain overvoltage or overcurrent event is occurring or has occurred. The INA381

devices are currently available in a 8-pin WSON surface-mount package with a thermal pad as the device

ground connection. Table 1 lists the available gain options.

Table 1. INA381Ax Device Summary

Product Gain

INA381A1 20 V/V

INA381A2 50 V/V

INA381A3 100 V/V

INA381A4 200 V/V

1.1 Kit Contents

Table 2 lists the contents of the INA381EVM kit. Contact the nearest Texas Instruments Product

Information Center if any component is missing. TI highly recommends checking the INA381 family

product folder on the TI website at www.ti.com for further information regarding this product.

Table 2. INA381EVM Kit Contents

Item Quantity

INA381EVM Test Board 1

1.2 Related Documentation From Texas Instruments

The following document provides information regarding TI's integrated circuits used in the assembly of the

INA381EVM. This user's guide is available from the TI website under literature number SBOU196. Any

letter appended to the literature number corresponds to the document revision that is current at the time of

the writing of this document. Newer revisions are available from www.ti.com or the Texas Instruments'

Literature Response Center at (800) 477-8924 or the Product Information Center at (972) 644-5580. When

ordering, identify the document by both title and literature number.

Table 3. Related Documentation

document Literature Number

INA381 product data sheet SBOS848

Hardware

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INA381EVM

2 Hardware

The INA381 is an op amp current-sense solution that provides ease of use and high performance. The

INA381EVM is intended to provide basic functional evaluation of this device family. 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 INA381EVM consists of one PCB with an option to snap apart into four individual

PCBs; one for each of the four devices (INA381A1, INA381A2, INA381A3, and INA381A4).

2.1 Features

The layout of the INA381EVM printed-circuit board (PCB) is designed to provide the following features:

• Evaluation of all gain options for the INA381Ax

• Ease of access to device pins with test points

• Capability to evaluate high-side and low-side configurations

• Ability to set the comparator trip voltage.

See the INA381 data sheet for comprehensive information about the INA381 family of devices.

3 Quick Start Setup and Use

The following are instructions to set up and use the INA381 devices of the INA381EVM. For the following

instructions, x = A to D.

Step 1. Connect ground reference of that supply to the GND test point TPx1 or TPxV1 and connect

an external dc supply voltage between 2.7 V and 5.5 V to the Vs test point TPx2 or TPxV2.

Step 2. Connect the input per Section 3.1.

3.1 Measurements

The INA381EVM enables the user to either simulate the voltage developed across a sense resistor based

on a given set of system conditions or to connect remotely to an existing shunt already included in an

example application.

The following procedures are used to configure a measurement evaluation without a shunt. For the

following instructions, x = A to D.

Step 1. Stack a floating differential voltage supply on top of a common mode voltage by connecting

the ground of the floating differential voltage supply to the positive voltage output of the

common mode voltage supply. Adjust common mode voltage to any value between –0.2 V

and +26 V; the data sheet condition is 12 V.

Step 2. Connect the positive polarity of the differential voltage to IN+ (TPx3 or TPxV3) and the

negative polarity to IN– (TPx5 or TPxV5) test points. (IN+ pin must be the more positive of

the two inputs.)

Step 3. Measure the output voltage at the VOUT test point (TPx4 or TPxV4).

NOTE: The output voltage is equal to the gain of the device multiplied by the differential voltage

measured directly at the device input pins.

3.2 Alert Function

The INA381EVM provides an alert pin that will pull low when the output exceeds a user-defined voltage.

With the alert function, there are two different modes: latch mode and continuous mode. The device enters

latch mode when RESET (pin 4) is pulled to VS+ (pin 2). When reset is pulled to GND (bottom pad) the

device enters continuous mode and resets the device if it is latched and the output voltage is below

CMPREF (pin 5). CMPREF determines at what voltage the ALERT pin goes low. This value is

conveniently adjustable to any voltage between GND and VS+ with the onboard potentiometer. When the

voltage on VOUT exceeds the voltage of CMPREF, the onboard LED turns on.

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Circuitry

SBOU196–December 2017

INA381EVM

4 Circuitry

This section summarizes the INA381EVM components. For the following instructions, x = A to D.

4.1 Cx1, Cx2

Cx1 and Cx2 are 10-μF and 0.1-μF supply bypass capacitors respectively.

4.2 Cx3, Rx2, Rx4

Cx3, Rx2, and Rx4 footprints are for customizing the input pi-filter to the INA381 device. Default values

are 0 Ωand 1000 pF. However, no capacitor is installed.

4.3 Cx4, Rx3

Cx4 and Rx3 are footprints for a customizable output filter. Default values are 0 Ωand 1000 pF. However,

no capacitor is installed.

4.4 Ux1

Ux1 is the test-device location. Four device boards are supplied with the INA381EVM. Each board is

populated with one of the available device gains: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This option enables

users to test the devices and determine the gain setting best suited for a given application. The following

list of factors is involved in selecting the appropriate device:

• Select INA381 for unidirectional applications only.

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

flows through the shunt resistor connected across the inputs.

• The most limiting factor that requires attention to be given to device selection is the output voltage.

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

Vsense voltage (IN+ – IN–) is amplified by the respective device gain. The max output voltage must

remain within the range of 10 mV above ground to 100 mV below the supply voltage.

• Choose an appropriate gain and sense resistor to create the largest appropriate output swing possible

and to minimize error.

4.5 Rx5, Cx5

Rx5 is a 50-kΩtrimming potentiometer that allows the user to set the CMPREF voltage without having to

use an additional power supply. Cx5 is a bypass capacitor that is meant to absorb any transients that

would otherwise feed into the CMPREF pin.

4.6 Rx1, Rx7, Qx1, Dx1

Rx1 serves as a pull-up resistor that keeps the ALERT pin voltage around VS+ when the ALERT pin is

open drain (inactive) and as an impedance path that prevents VS+ from shorting to GND when the ALERT

pin goes low (active). Qx1 serves as a switch controlled by the ALERT pin. When Qx1 switches on

(ALERT goes active low), Dx1 turns on, which notifies the user that voltage at VOUT exceeded the

voltage at CMPREF. Rx7 limits the current through Dx1.

4.7 Jx

Jx controls whether the device uses continuous mode or latch mode. RST shorted to VS+ puts the device

in latch mode. RST shorted to GND puts the device in continuous mode.

4.8 Voltages Inputs

The IN+ (TPx3 or TPxV3) and IN– (TPx5 or TPxV5) inputs accept a differential voltage that is amplified by

the selected device gain and is presented at the VOUT test point (TPx04 or TPx14). These inputs can

also be used to connect the differential voltage developed across an external shunt in an existing circuit.

The acceptable differential input voltage range and polarity are determined by the supply voltage and gain

of the selected device.

QB1

RB2

DB1

1000pF

CB3

DNP

RB4

VCCB

0.1µF

CB2

GND

TPB2

TPB1

10µF

CB1

RB6

RB3

1000pF

CB4

DNP

GND

10.0k

RB1

GND

VCCB

TPB4

VOUT

TPBV1

TPBV2

TPBV4

VOUT

VS+

VOUT 7

CMPIN

6GND 9

RESET 4

ALERT 3

IN-

IN+

CMPREF

INA381A2DSG

UB1

TPB3

IN+

TPB5

IN-

RB5

3312J-1-503E

GND

TPB6

CMPREF

1000pF

CB5

TPBV6

TPBV3

IN+

TPBV5

IN-

2.05k

RB7

VCCD

VS+

VOUT 7

CMPIN

6GND 9

RESET 4

ALERT 3

IN-

IN+

CMPREF

UA1

INA381A1DSG

QA1

TPA3

IN+ 0

RA2

DA1

1000pF

CA3DNP

RA4

TPA5

IN-

VCCA

0.1µF

CA2

GND

TPA2

TPA1

10µF

CA1

RA6

RA3

1000pF

CA4

DNP

GND

10.0k

RA1

GND

VCCA

TPA4

VOUT

RA5

3312J-1-503E

GND

TPA6

CMPREF

1000pF

CA5

TPAV6

TPAV1

TPAV2

TPAV3

IN+

TPAV5

IN-

TPAV4

VOUT

2.05k

RA7

VCCC

Schematics, PCB Layout, and Bill of Materials

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INA381EVM

5 Schematics, 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.

The figures are not intended to be used for manufacturing INA381EVM PCBs.

5.1 Schematics

Figure 1 through Figure 4 shows the schematics for the INA381EVM A1, A2, A3, and A4 devices,

respectively.

Figure 1. Schematic for A1 Device

Figure 2. Schematic for A2 Device

GND

QD1

RD2

DD1

1000pF

CD3DNP

RD4

VCCD

0.1µF

CD2

GND

TPD2

TPD1

10µF

CD1

RD6

RD3

1000pF

CD4

DNP

GND

10.0k

RD1

GND

VCCD

TPD4

VOUT

TPDV1

TPDV2

TPDV4

VOUT

VS+

VOUT 7

CMPIN

6GND 9

RESET 4

ALERT 3

IN-

IN+

CMPREF

INA381A4DSG

UD1

TPD3

IN+

TPD5

IN-

RD5

3312J-1-503E

GND

TPD6

CMPREF

1000pF

CD5

TPDV6

TPDV3

IN+

TPDV5

IN-

2.05k

RD7

GND

QC1

RC2

DC1

1000pF

CC3

DNP

RC4

VCCC

0.1µF

CC2

GND

TPC2

TPC1

10µF

CC1

RC6

RC3

1000pF

CC4DNP

GND

10.0k

RC1

GND

VCCC

TPC4

VOUT

TPCV1

TPCV2

TPCV4

VOUT

VS+

VOUT 7

CMPIN

6GND 9

RESET 4

ALERT 3

IN-

IN+

CMPREF

INA381A3DSG

UC1

TPC3

IN+

TPC5

IN-

RC5

3312J-1-503E

GND

TPC6

CMPREF

1000pF

CC5

TPCV6

TPCV3

IN+

TPCV5

IN-

2.05k

RC7

GND

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Schematics, PCB Layout, and Bill of Materials

SBOU196–December 2017

INA381EVM

Figure 3. Schematic for A3 Device

Figure 4. Schematic for A4 Device

Schematics, PCB Layout, and Bill of Materials

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5.2 PCB Layout

Figure 5 through Figure 8 illustrate the PCB layers of the INA381EVM.

Figure 5. Top Overlay

Figure 6. Top Layer

Figure 7. Bottom Overlay

Figure 8. Bottom Layer

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Schematics, PCB Layout, and Bill of Materials

SBOU196–December 2017

INA381EVM

5.3 Bill of Materials

Table 4 provides the parts list for the INA381EVM.

Table 4. Bill of Materials

Designator Quantity Value Description Package Reference Part Number Manufacturer

CA1, CB1, CC1, CD1 4 10uF CAP, CERM, 10 µF, 16 V,+/- 20%, X7R, 0805 0805 EMK212BB7106MG-T Taiyo Yuden

CA2, CB2, CC2, CD2 4 0.1uF CAP, CERM, 0.1 µF, 16 V,+/- 10%, X7R, 0603 0603 C0603C104K4RACTU Kemet

CA5, CB5, CC5, CD5 4 1000pF CAP, CERM, 1000 pF, 50 V, +/- 10%, X7R,

0603 0603 C0603C102K5RACTU Kemet

DA1, DB1, DC1, DD1 4 Green LED, Green, SMD LED_0805 APT2012LZGCK Kingbright

H1, H2, H3, H4, H5, H6, H7, H8,

H9, H10, H11, H12, H13, H14,

H15, H16

16 Bumpon, Hemisphere, 0.25 X 0.075, Clear 75x250 mil SJ5382 3M

JA, JB, JC, JD 4 Header, 1.27mm, 3x1, Gold, SMT Header, 1.27mm, 3x1,

SMT GRPB031VWTC-RC Sullins Connector

Solutions

QA1, QB1, QC1, QD1 4 -50V MOSFET, P-CH, -50 V, -0.13 A, SOT-23 SOT-23 BSS84-7-F Diodes Inc.

RA1, RB1, RC1, RD1 4 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0710KL Yageo America

RA2, RA3, RA4, RA6, RB2, RB3,

RB4, RB6, RC2, RC3, RC4, RC6,

RD2, RD3, RD4, RD6

16 0 RES, 0, 5%, 0.1 W, 0603 0603 RC0603JR-070RL Yageo America

RA5, RB5, RC5, RD5 4 50k TRIMMER, 50k ohm, 0.1 W, SMD 2.5x2.8mm 3312J-1-503E Bourns

RA7, RB7, RC7, RD7 4 2.05k RES, 2.05 k, 1%, 0.1 W, 0603 0603 RC0603FR-072K05L Yageo America

SH-J1, SH-J2, SH-J3, SH-J4 4 Mini Shunt, Closed Top, 650 V AC, -45 to 85

degC, Pitch 1.27 mm, Height 3 mm, RoHS Mini Shunt, Body

2.5x1.27mm, Height 3mm NPB02SVAN-RC Sullins Connector

Solutions

TPA1, TPA2, TPA3, TPA4, TPA5,

TPA6, TPB1, TPB2, TPB3, TPB4,

TPB5, TPB6, TPC1, TPC2, TPC3,

TPC4, TPC5, TPC6, TPD1, TPD2,

TPD3, TPD4, TPD5, TPD6

24 Test Point, Miniature, SMT Testpoint_Keystone_Miniat

ure 5015 Keystone

UA1 1 20V/V 26-V, Low Cost, Zero-Drift, Voltage-Output,

Current-Shunt Monitor With Integrated

Comparator, DSG0008A (WSON-8)

DSG0008A INA381A1DSG Texas Instuments

UB1 1 50V/V 26-V, Low Cost, Zero-Drift, Voltage-Output,

Current-Shunt Monitor With Integrated

Comparator, DSG0008A (WSON-8)

DSG0008A INA381A2DSG Texas Instuments

UC1 1 100V/V 26-V, Low Cost, Zero-Drift, Voltage-Output,

Current-Shunt Monitor With Integrated

Comparator, DSG0008A (WSON-8)

DSG0008A INA381A3DSG Texas Instuments

UD1 1 200V/V 26-V, Low Cost, Zero-Drift, Voltage-Output,

Current-Shunt Monitor With Integrated

Comparator, DSG0008A (WSON-8)

DSG0008A INA381A4DSG Texas Instuments

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

3Regulatory Notices:

3.1 United States

3.1.1 Notice applicable to EVMs not FCC-Approved:

FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software

associated with the kit to determine whether to incorporate such items in a finished product and software developers to write

software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or

otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition

that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.

Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must

operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.

3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:

CAUTION

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not

cause harmful interference, and (2) this device must accept any interference received, including interference that may cause

undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to

operate the equipment.

FCC Interference Statement for Class A EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not

installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to

correct the interference at his own expense.

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