Texas Instruments INA310EVM Manual de usuario

User’s Guide

INA310EVM User’s Guide

ABSTRACT

This user’s guide describes the characteristics, operation, and use of the INA310EVM. This EVM is designed

to evaluate the performance of the INA310x. Throughout this document, the terms evaluation board, evaluation

module, and EVM are synonymous with the INA310EVM. This document includes a schematic, reference printed

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

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INA310EVM User’s Guide 1

Table of Contents

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

1 Overview..................................................................................................................................................................................5

1.1 Kit Contents........................................................................................................................................................................5

1.2 Related Documentation From Texas Instruments.............................................................................................................. 6

2 Hardware................................................................................................................................................................................. 6

2.1 Features............................................................................................................................................................................. 6

3 Operation.................................................................................................................................................................................7

3.1 Quick Start Setup............................................................................................................................................................... 7

3.2 Measurements................................................................................................................................................................... 7

3.3 Comparator........................................................................................................................................................................ 7

4 Circuitry................................................................................................................................................................................... 8

4.1 Current Sensing IC.............................................................................................................................................................8

4.2 Input Signal Path................................................................................................................................................................8

4.3 Device Output and Comparator......................................................................................................................................... 8

5 Schematics, PCB Layout, and Bill of Materials................................................................................................................... 9

5.1 Schematics.........................................................................................................................................................................9

5.2 PCB Layout...................................................................................................................................................................... 11

5.3 Bill of Materials.................................................................................................................................................................12

Trademarks

All trademarks are the property of their respective owners.

Table of Contents www.ti.com

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

WARNING

Always follow TI's set-up 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://ti.com/

customer support 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 non-conductive work surface.

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

freehand testing whenever possible.

2. Electrical Safety:

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

have fully accessible and active high voltages.

b. 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.

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

measurement equipment hook-ups and other application needs, while still assuming the EVM circuit and

measuring instruments are electrically live.

d. Once EVM readiness is complete, energize the EVM as intended.

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INA310EVM User’s Guide 3

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 from accidental touch.

Limitation for safe use:

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

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

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1 Overview

The INA310x is an ultra-precise current sense amplifier that can measure voltage drops across shunt resistors

over a wide common-mode range from –4 V to 110 V, independent of supply voltage with an integrated

comparator. The high precision current measurement accuracy is achieved through a combination of low offset

voltage (20 µV, maximum), small gain error (0.15%, maximum) and a high DC CMRR (160 dB, typical). The

INA310x has a high signal bandwidth of 1.3 MHz designed for high voltage DC current measurements and

high-speed applications like fast overcurrent protection.

The INA310x incorporates an open-drain comparator and internal reference that provides a 0.6-V threshold. An

external resistive divider sets the current trip point. The comparator includes a latching capability that can be

made transparent by grounding (or leaving open) the RESET pin.

The INA310x operates from a single 2.7-V to 20-V supply and draws 1.6 mA of supply current. The INA310x is

available in five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address a wide

dynamic range of current-sensing applications.

The INA310x is specified over an operating temperature range of −40°C to +125°C and is offered in a space-

saving 8-pin VSSOP package.

Table 1-1. Device Summary

EVM ORDERABLE PRODUCT GAIN MAX GAIN

ERROR

MAX OFFSET

VOLTAGE

INA310AEVM

INA310A1 20 V/V

0.15% ±20 µV

INA310A2 50 V/V

INA310A3 100 V/V

INA310A4 200 V/V

INA310A5 500 V/V

INA310BEVM

INA310B1 20 V/V

0.5% ±150 µV

INA310B2 50 V/V

INA310B3 100 V/V

INA310B4 200 V/V

INA310B5 500 V/V

1.1 Kit Contents

Table 1-2 lists the contents of the EVM kit. Contact Texas Instruments' customer support center if any

component is missing.

Table 1-2. Kit Contents

ITEM QUANTITY

INA310AEVM or INA310BEVM test board 1

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INA310EVM User’s Guide 5

1.2 Related Documentation From Texas Instruments

This user's guide is available from the TI website under literature number SBOU284. Any letter appended to the

literature number corresponds to the document revision that is current at the time of the writing of this document.

When ordering, identify the document by both title and literature number. Table 1-3 lists documentation related to

the EVM. Click the links in Table 1-3 for further information. The device name links to the product web folder on

www.ti.com. The literature number links to the document PDF.

Table 1-3. Related Documentation

DOCUMENT TITLE

DOCUMENT

LITERATURE

NUMBER

INA310 data sheet SBOSA86

2 Hardware

The EVM is intended to provide basic functional evaluation of the INA310x. The layout is not intended to be a

model for the target circuit, nor is the layout intended for electromagnetic compatibility (EMC) testing. The EVM

consists of one printed circuit board (PCB) with optional PCB cutouts for each of the five gain options (1 to 5)

listed in Table 1-1. Each PCB cutout has one INA310xn device (where x is version A or B, and n is 1, 2, 3, 4,

or 5), test points and sockets for external hardware connections, and pads to solder down optional circuitry. The

EVM supports current measurements up to 5 A through the PCB.

2.1 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

Overview www.ti.com

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3 Operation

3.1 Quick Start Setup

The following instructions describe how to set up and use the EVM. For these instructions, when referencing part

designators, the part version (A or B) and the gain option (1, 2, 3, 4, or 5) will be ignored. For example R1_A3

will just be referred to as R1.

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, then 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 IN+ and IN– nodes by connecting the signal leads to their

respective pins on terminal J1 on the EVM as explained in Measurements

3.2 Measurements

The EVM can be used with either an onboard or external shunt resistor. To use the onboard shunt resistor,

solder a 2512 surface-mount technology (SMT) shunt resistor across the pads of R1, and connect it in series

with the external system and load current through J1. An external shunt can be connected directly across the

terminals of J1.

3.2.1 Detailed Setup

To configure a measurement evaluation, follow these steps:

1. Connect a shunt resistor by doing either of the following:

a. Solder a 2512 resistor across the pads of R1 that connects the IN+ and IN– inputs.

b. Connect an external shunt across the IN+ and IN– terminals of J1.

2. Connect the IN+ and IN– terminals in series with the load while powered off.

a. When measuring more than 5 A, make sure the high current path does not go through the EVM

(including the terminal block J1).

b. When using 5 A or less with either an onboard or external shunt, the current path can be passed through

the EVM.

WARNING

When measuring current, first make sure that the equipment (shunt resistor, wires,

connectors, and so on) can support the amperage and power dissipation. Secondly, make

sure that the current flowing through J1 does not exceed 5 A. Failure to do so can result in

damage to the EVM, or personal injury.

Do not touch high voltage terminals.

The EVM may get hot.

3. Power on the system and measure the output voltage at the OUT test point

a. Vout is equal to the gain of the device multiplied by the differential voltage measured directly at the

device input pins

3.3 Comparator

The INA310 incorporates an open-drain active high comparator and internal reference providing a 0.6-V

threshold. An external resistor divider sets the current trip point, and the comparator output will assert high

when a voltage greater than 0.6 V is preset at the CMPin pin. Switch SW1 can be used to put the comparator in

either latch or transparent mode. When in latch mode, SW1 can be moved to the reset position to clear the alert.

The switch will then automatically return to the latch position. When the comparator threshold is reached, LED

D1 will turn on.

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4 Circuitry

This section summarizes the EVM subsystems and their components. For these descriptions, when referencing

part designators, the part version (A or B) and the gain option (1, 2, 3, 4, or 5) will be ignored. For example

R1_A3 will just be referred to as R1.

4.1 Current Sensing IC

This section describes the main INA device and supporting components.

U1 is the INA310x current-sensing device (any gain or variant). C1 is a bypass capacitor that is placed near the

sensor to help mitigate power-supply noise and provide current quickly to the device when needed.

The non-input device pins can be monitored directly through the test points TP1 – TP7. Note that there is one

extra test point on GND for convenience. The input pins can be monitored either through the terminal J1, or by

probing the pads of C2.

4.2 Input Signal Path

This section describes the circuitry of the input signal path.

J1 is used to connect IN+ and IN–.

R1 can be used for an optional onboard shunt resistor with a 2512 footprint. Alternatively, a shunt can be placed

across the IN+ and IN– terminals of J1. If desired, a differential voltage can be applied directly for measurement

tests.

C2, R2, and R3 combine to make an optional input filter. R2 and R3 are populated with 0-Ω resistors by default.

When using input filtering, take the input bias current of the device into account. See the data sheet for more

information on input filtering.

4.3 Device Output and Comparator

This section describes the circuitry around the output and comparator of the device.

R4 and C3 are used for an optional output filter. C3 is left unpopulated and R4 is populated with a 0-Ω resistor by

default.

R5 and R6 are used as a voltage divider to set the threshold at CMPin. By default, these resistors are set with

R5 = 10.2 kΩ and R6 = 3.4 kΩ so that the voltage at CMPin is 1/4th the voltage of OUT, causing the comparator

to trip when the output voltage is at 2.4 V.

R8 is the pullup resistor for the active high comparator alert pin CMPout. LED D1 and current-limiting resistor R7

are used with the N-Channel MOSFET Q1 to indicate when the ALERT pin is triggered.

Switch SW1 is used to put the comparator in either latch or transparent mode. When in latch mode, SW1 can be

moved to the reset position to clear the alert. The switch will then automatically return to the latch position.

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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 EVM PCBs.

5.1 Schematics

Figure 5-1 and Figure 5-2 show the schematic of the EVM. Figure 5-1 shows the circuitry for the A1 sub board

on the INA310AEM. Only the schematic for the A1 version is shown as all variants use the same schematic. The

only differences between schematics for different variants and gain versions is that U1 changes to match the

device, and the "_1" appended to each component below will change to match the gain number of the device.

Figure 5-2 shows the hardware section of the schematic that is not repeated per sub board.

0.01

R1_1

R2_1

GND

0.1uF

C2_1

R3_1

H1_1 H2_1 H3_1 H4_1

Vin+

Vout

Vin-

DANGER HIGH VOLTAGE

TP2_1

OUT

TP7_1

GND

TP1_1

TP4_1

GND

J1_1

R4_1

100pF

C3_1

GND

Input side capable up to 110V

0.1uF

C1_1

TP6_1

CMPOUT

D1_1

10k

R7_1

4.7k

R8_1

3.40k

R6_1

10.2k

R5_1

GND

TP3_1

CMPIN

Input Current <5A when using onboard R1 as shunt resistor

SW1_1

GND

IN+

IN-

RESET 5

CMPin 3

CMPout 6

OUT 2

GND 4

INA310A1IDGKR

U1_1

CMPOUT

TP5_1

RESET

Q1_1

GND

Size: 0.65" x 0.20 "

PCB Label

LBL2_1

THT-14-423-10

LBL2 Variant/Label Table

Variant LBL2_1 Label Text

001 INA310A1

002 INA310B1

LBL2_3 Label Text

INA310A3

INA310B3

LBL2_4 Label Text

INA310A4

INA310B4

LBL2_5 Label Text

INA310A5

INA310B5

LBL2_2 Label Text

INA310A2

INA310B2

Figure 5-1. INA310 Schematic

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INA310EVM User’s Guide 9

LOGO

PCB

Texas Instruments

FID2FID1 FID3

SENS095

PCB Number:

PCB Rev:

Assembly Note

ZZ2

These assemblies are ESD sensi



ve, ESD precau



ons shall be observed.

Assembly Note

ZZ3

These assemblies must be clean and free from



ux and all contaminants. Use of no clean



ux is not acceptable.

Assembly Note

ZZ4

These assemblies must comply with workmanship standards IPC-A-610 Class 2, unless otherwise speci



ed.

CE Mark

LOGO

PCB

FCC disclaimer

LOGO

PCB

WEEE logo

DANGER HIGH VOLTAGE

Size: 0.65" x 0.20 "

PCB Label

LBL1

THT-14-423-10

LBL1 Variant/Label Table

Variant LBL1 Label Text

001 INA310AEVM

002 INA310BEVM

Figure 5-2. INA310 Hardware Schematic

Schematics, PCB Layout, and Bill of Materials www.ti.com

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