Download INA193EVM User`s Guide

User's Guide
SBOU147 – August 2015
INA193EVM User's Guide
This user’s guide describes the characteristics, operation, and use of the INA193EVM evaluation module.
It discusses how to set up and configure the hardware, and reviews various aspects of the hardware
operation. Throughout this document, the terms evaluation board, evaluation module, and EVM are
synonymous with the INA193EVM. This document also includes an electrical schematic, printed circuit
board (PCB) layout drawings, and a parts list for the EVM.
1
2
3
4
Contents
Overview .....................................................................................................................
Quick Start Setup and Use .................................................................................................
Hardware......................................................................................................................
Schematic, PCB Layout, and Bill of Materials ...........................................................................
2
2
3
5
List of Figures
1
INA193 Test Board Block Diagram ........................................................................................ 4
2
INA193 Test-Board Schematic ............................................................................................. 5
3
PCB Component Placement
5
...............................................................................................
PCB Top Layer ...............................................................................................................
PCB Bottom Layer ...........................................................................................................
1
INA193EVM Kit Contents ................................................................................................... 2
2
Related Documentation ..................................................................................................... 2
3
INA193 Test Board Parts List
4
6
6
6
List of Tables
.............................................................................................
7
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1
Overview
1
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Overview
The INA193 is a current-shunt monitor with voltage output. The INA193EVM consists of one PCB. The
EVM consists of the INA193 device, screw-terminals, and test points for external hardware connections.
1.1
Kit Contents
Table 1 summarizes the contents of the INA193EVM kit. Contact the Texas Instruments Product
Information Center nearest you if any component is missing. Also, check the INA193 product folder on the
TI web site at www.ti.com for any further information regarding this product.
Table 1. INA193EVM Kit Contents
1.2
Item
Quantity
INA193 test board
1
Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments' integrated circuits used in the
assembly of the INA193EVM. This user's guide is available from the TI web site under literature number
SBOU147. 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 may be available from the TI web site,
or call 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 2. Related Documentation
2
Document
Literature Number
INA19x product data sheet
SBOS307
Quick Start Setup and Use
Follow these steps to set up and use the INA193EVM:
1. Connect an external dc supply voltage (between 2.7 V and 18 V) to the V+ pin referenced to the GND
pin of the J1 terminal block.
2. Connect the desired input to the J2 terminal block. This desired input is either a external shunt resistor
or a differential voltage source with a common-mode voltage of –16 V to +80 V referenced to the GND
pin.
2
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Hardware
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3
Hardware
The INA193EVM provides basic functional evaluation of the INA193. The fixture layout is not intended to
be a model for the target circuit, and is not laid out for electromagnetic compatibility (EMC) testing.
The layout of the INA193EVM PCB provides the following features:
• Ease of access to all device pins
• Multiple input signal options
• Optional surface-mount shunt
• Optional input filter
• Evaluate with and without a shunt resistor:
– The INA193EVM measures differential voltage both with and without a shunt resistor. Connect both
sides of an external shunt resistor to measure current, or omit the shunt resistor and apply a
differential voltage directly to the device input.
• INA19x family compatibility:
– INA193 can be desoldered and replaced with the INA194 or INA195 to evaluate other gains
available in this product family.
– INA196, INA197, and INA198 are the same devices in the same package, but with different pinouts.
The corresponding gains of the INA193 (20 V/V), INA194 (50 V/V), and INA195 (100 V/V) serve as
evaluation modules for those products as well.
Refer to the INA19x product data sheet for comprehensive information about this family of current-shunt
monitor devices.
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Hardware
3.1
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Theory of Operation
A block diagram of the INA193 test-board hardware is shown in Figure 1.The INA193 test board contains
three, 2-pin headers, giving access to all five pins of the INA193 for evaluation. Minimal support circuitry is
included on the PCB. Support circuitry can be removed or bypassed if necessary.
Supply
Voltage
Output
Voltage
INA193
OUT
V+
GND
VIN+
VIN±
VBus
RSHUNT
Load
Figure 1. INA193 Test Board Block Diagram
The INA193EVM requires a 2.7-V to 18-V power supply. Connect the VIN+ and VIN– pins across an
external shunt resistor, in series with a –16-V to +80-V supply, to find the current flowing through that
resistor. Optionally, populate R1 as the shunt resistor and connect in series with a load supply. This shunt
resistor has a 2512 footprint, and the traces on the EVM are only able to support up to 1.5 A at room
temperature. Shunt resistors with applied current must have an appropriate power rating. Use a voltmeter
on the OUT pin to measure the voltage output of the measurement. Optionally, use R2, R3, and C1 as an
input filter.
CAUTION
Choose a shunt resistor with an acceptable power rating and limit the current to
1.5 A or less; otherwise, damage to the EVM may result.
3.2
Voltage Inputs (VIN+ and VIN– Pins)
To evaluate the INA193, connect the VIN+ and VIN– pins at J2 to an external shunt resistor to produce a
differential voltage, or directly to a differential voltage source. The INA193 multiplies the differential voltage
by the device gain (20 V/V). The full-scale, sense-input voltage (VSENSE) is defined as (VIN+) – (VIN–), and
has a maximum input as shown in Equation 1:
Maximum VSENSE = [(V+) – 0.2] / Gain
where
•
•
V+ is the supply voltage
Gain = 20 V/V (for INA193)
(1)
The INA19x devices are specified for use with a VSENSE greater than 20 mV, where VSENSE = (VIN+) –
(VIN–). If the intended application requires gain error ≤ ±1.4% with common-mode voltages up to 80 V and
VSENSE ≤ 20 mV, consider the INA282 (50 V/V) and the INA286 (100 V/V) with the INA282-286EVM.
4
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Schematic, PCB Layout, and Bill of Materials
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4
Schematic, PCB Layout, and Bill of Materials
4.1
Schematic
Figure 2 shows the complete schematic of the INA193 test board. R1 is an optional shunt resistor. R2, R3,
and C1 form the optional input filter. Terminal block J1 allows access to the V+ and GND pins. Terminal
block J2 allows access to the VIN+ and VIN– pins. Terminal block J3 provides two screw terminals
connected to the OUT and GND pins.
Figure 2. INA193 Test-Board Schematic
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Schematic, PCB Layout, and Bill of Materials
4.2
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PCB Layout
Figure 3 shows the component placement on the top layer of the test board. There are no components on
the bottom layer. Figure 4 and Figure 5 show the top and bottom layers, respectively, of the test board.
Figure 3. PCB Component Placement
Figure 4. PCB Top Layer
Figure 5. PCB Bottom Layer
6
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Schematic, PCB Layout, and Bill of Materials
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4.3
Bill of Materials
Table 3 lists the bill of materials for the INA193 test board.
Table 3. INA193 Test Board Parts List
Quantity
RefDes
2
GND1, GND2
Test Point, Miniature, Black, TH
5001
Keystone
3
OUT, VIN+, VIN-
Test Point, Miniature, Yellow, TH
5004
Keystone
1
V+1
Test Point, Miniature, Red, TH
5000
Keystone
0
C1
CAP, CERM, 0.1uF, 100V, +/-20%, X7R, 1206 (Unpopulated)
12061C104MAT2A
AVX Corporation
4
H9, H10, H11, H12
Bumpon, Cylindrical, 0.312 X 0.200, Black
SJ61A1
3M
3
J1, J2, J3
Terminal Block, 6A, 3.5mm Pitch, 2-Pos, TH
ED555/2DS
On Shore
Technology
RES, 0.01 ohm, 1%, 3W, 2512 (Unpopulated)
CRA2512-FZ-R010ELF
Bourns
RES, 0 ohm, 5%, 0.25W, 1206
CRCW12060000Z0EA
Vishay-Dale
Current-Shunt Monitor -16V to +80V Common Mode Range,
DBV0005A
INA193AIDBV
Texas Instruments
0
R1
2
R2, R3
1
U1
Description
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Part Number
Manufacturer
INA193EVM User's Guide
Copyright © 2015, Texas Instruments Incorporated
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