Texas Instruments TMCS1101EVM User manual

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

User's Guide

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

This user’s guide describes the characteristics, operation, and use of the TMCS1101 evaluation module

(EVM). This EVM is designed to evaluate the performance of the TMCS1101 voltage output isolated Hall-

effect current sense amplifiers in a variety of configurations. Throughout this document, the terms

evaluation board, evaluation module, and EVM are synonymous with the TMCS1101EVM. This document

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...................................................................................................................... 4

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

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

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

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

3.2 Circuitry .............................................................................................................. 6

3.3 Temperature Sensor ............................................................................................... 6

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

4.1 Measurements ...................................................................................................... 8

4.2 Advanced Measurement Tips..................................................................................... 8

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

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

5.2 PCB Layout ........................................................................................................ 10

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

List of Figures

1 Low-Side Forward Current Setup.......................................................................................... 7

2 Schematic for A1 Device ................................................................................................... 9

3 Top Overlay................................................................................................................. 10

4 Top Layer ................................................................................................................... 10

5 Bottom Overlay............................................................................................................. 11

6 Bottom Layer................................................................................................................ 11

List of Tables

1 TMCS1101Ax Device Summary........................................................................................... 4

2 TMCS1101EVM Kit Contents .............................................................................................. 4

3 Related Documentation..................................................................................................... 4

4 Bill of Materials ............................................................................................................. 12

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

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

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.

Overview

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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.

2 Overview

The TMCS1101 Hall-effect current sense amplifier (also called an isolated current-sense amplifier) senses

magnetic flux generated from current passing through the lead frame at common-mode voltages from 0

VDC to 600 VDC, independent of the supply voltage. In both bidirectional (B) and unidirectional (U)

configurations, four fixed gains are available: 50 mV/A, 100 mV/A, 200 mV/A, and 400 mV/A. These

devices operate from a single 3-V to 5.5-V power supply, drawing a maximum of 5 mA of supply current

per amplifier channel. The TMCS1101 is currently available in an 8-pin, SOIC, surface-mount package.

Table 1 lists the available gain options.

Table 1. TMCS1101Ax Device Summary

Product Direction Gain

TMCS1101A1B Bidirectional 50 mV/A

TMCS1101A2B Bidirectional 100 mV/A

TMCS1101A3B Bidirectional 200 mV/A

TMCS1101A4B Bidirectional 400 mV/A

TMCS1101A1U Unidirectional 50 mV/A

TMCS1101A2U Unidirectional 100 mV/A

TMCS1101A3U Unidirectional 200 mV/A

TMCS1101A4U Unidirectional 400 mV/A

2.1 Kit Contents

Table 2 lists the contents of the TMCS1101EVM kit. Contact the nearest Texas Instruments Customer

Support Center if any component is missing. TI highly recommends checking the TMCS1101 family

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

Table 2. TMCS1101EVM Kit Contents

Item Quantity

TMCS1101EVM Test Board 1

2.2 Related Documentation From Texas Instruments

Table 3 provides literature references for TI's integrated circuits used in the assembly of the

TMCS1101EVM. This user's guide is available from the TI website under literature number SLYU051. 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

TMCS1101 product data sheet SBOS825

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Hardware

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

3 Hardware

The TMCS1101 is an isolated, current-sense op amp that provides ease-of-use and high performance.

The TMCS1101EVM is intended to provide basic functional evaluation of all TMCS1101 gain variants. The

TMCS1101EVM is not laid out for electromagnetic compatibility (EMC) testing. The TMCS1101EVM

consists of one PCB that can be snapped apart into eight individual segments; one for each of the four

gain variants in both the bidirectional (B) and unidirectional (U) configurations:

• TMCS1101A1B

• TMCS1101A2B

• TMCS1101A3B

• TMCS1101A4B

• TMCS1101A1U

• TMCS1101A2U

• TMCS1101A3U

• TMCS1101A4U

3.1 Features

The layout of the TMCS1101EVM PCB is designed to provide the following features:

• Evaluation of all gain options for the TMCS1101

• Ease-of-access to device pins with test points

• Evaluation of high-side and low-side configurations

• On-board temperature sensor

See the TMCS1101 data sheet for comprehensive information about the TMCS1101.

Hardware

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3.2 Circuitry

This section summarizes the TMCS1101EVM components.

For the following circuits:

• x = B for bidirectional, or U for unidirectional

• y = A to D for the A1 to A4 gain variants, respectively.

3.2.1 Bypass Capacitors

C1xy and C2xy are 10-μF and 0.1-μF supply bypass capacitors, respectively, for the TMCS1101. C4xy is

the 0.1-μF bypass capacitor for the optional temperature sensor.

3.2.2 Output Filter

C3xy and R1xy are footprints for the optional output filter. Default values are 10 pF and 0 Ω, but no

capacitors are installed. TP2xy is the test point for the TMCS1101 output.

3.2.3 Measurement Connector

J2x is an additional connector for measuring VCC and VOUT. J2x also provides a connection for

measuring board temperature (TMP).

3.2.4 Load Connectors

T1xy and T2xy correspond to the high-current rated load connectors. By default, the EVM is only

populated with two of these connectors on the bidirectional, lowest gain variant (x = B and y = A). TP3x

and TP6x are Kelvin connections to probe the EVM inputs. The IS+ (T1xy) and IS– (T2xy) inputs accept a

load that is converted to a magnetic field sensed by a Hall element that produces a voltage. This voltage

is amplified by the selected device gain and is presented at the VOUT test point (TP2xy). The acceptable

load input maximum is 20 A for dc measurements. However, the load can be significantly higher for ac

signals, and the load is bound by the safe operating area (SOA) described in the TMCS1101 data sheet.

3.2.5 Ground Test Points

TP3x, TP4x, and TP5x correspond to ground connections of the TMCS1100 device.

3.2.6 TMCS1101 Isolated Current-Sense Amplifier

U1xy is the TMCS1101 isolated current-sense amplifier. Eight segments are supplied within the

TMCS1101EVM board. Each segment is populated with one of the available device gains for bidirectional

or unidirectional sensing. This configuration enables users to test the devices and determine the best gain

setting for a given application. For y = A to D, the gain is 50 mV/A, 100 mV/A, 200 mV/A, and 400 mV/A,

respectively.

• The TMCS1101AnB is used for bidirectional applications, while TMCS1101AnU is used for

unidirectional applications (where n = 1 to 4 for the A1 to A4 gain variants, respectively).

• A magnetic field is generated based on the load current that is connected across the inputs IS+ and

IS–, and flows through the TMCS1101 leadframe.

• The output voltage swing limitation and required load current sensing range are the key factors when

determining device selection.

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

current is transduced and amplified by the respective device gain. The max output voltage must remain

within the range of 25 mV above ground to 100 mV below the supply voltage.

• Choose an appropriate gain to create the largest appropriate output swing, and to minimize error.

3.3 Temperature Sensor

U2x is a temperature sensor that is not required for TMCS1100 operation. However, U2x provides the

option of measuring board temperature for determining ambient conditions.

hot-supply

”600V

Electronic Load

cold-supply

3- 5V

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Operation

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

4 Operation

The following are instructions to set up and use the TMCS1101EVM. For the following instructions, y = A

to D for the A1 to A4 gain variants, respectively. Figure 1 shows an example of a simple, low-side setup

on the A1B (50 mV/A) gain variant. This device has isolation, and external supplies are distinguished by

hot for load and cold for DUT supply. The hot supply can be isolated and at a different potential than the

cold supply.

Figure 1. Low-Side Forward Current Setup

Step 1. For greater maneuverable flexibility, break apart the EVM sub boards along the score lines.

Otherwise, the board can be left intact.

Step 2. Attach the high-current lug connectors to IS+ and IS– of the gain version to be tested.

Step 3. Connect the terminals of an external cold supply to the GND and VCC test points on the EVM

gain variant of choice. Be sure to connect GND first and make sure that the external cold

supply is between 3 V and 5.5 V.

Step 4. Connect the input per Section 4.1.

Operation

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WARNING

Do not leave EVM powered when unattended.

Hot surface. Contact may cause burns. Do not touch!

4.1 Measurements

The following procedures are used to configure a measurement evaluation with an electronic load. For the

following instructions, y = A to D for the A1 to A4 gain variants, respectively.

Step 1. According to Figure 1, for a low-side measurement, connect the electronic load positive input

terminal to the positive terminal of a ≥20-A capable hot-supply. For a high-side

measurement, connect the electronic load positive input terminal to the load sourcing terminal

(IS+ or IS–) of the EVM. For high-side measurement of forward current, IS– sources to the

electronic load; for reverse current, IS+ sources to the load.

Step 2. Connect the electronic load negative output terminal to the external hot supply GND terminal

for high-side measurements, or to the load sinking terminal of the EVM for low-side

measurements.

Step 3. For high-side measurements, connect the external supply to the load sinking terminal of the

EVM. Otherwise, for low-side measurements, connect the load sourcing terminal of the EVM

(IS+ or IS–) to the external supply gnd.

Step 4. Turn on all the connected supplies.

Step 5. Apply load with electronic load.

Step 6. Measure the output voltage at the VOUT test point.

NOTE: The output voltage is equal to the gain of the device multiplied by the load current passing

through the leadframe of the DUT.

4.2 Advanced Measurement Tips

To assess whether the expected load matches the measured load, use a precision shunt resistor rated for

the maximum intended current in series with the DUT. The precision shunt should have a kelvin

connection where the generated sense voltage can be measured by a precision multimeter, such as the

3458a multimeter. Sensing the shunt voltage is preferred as a typical multimeter may have a current limit

far below 20 A. Additionally some meters have better voltage measurement precision than current

measurement precision.

For evaluating performance when the DUT is subjected to quick current pulses, use short, large-gauge

wire, or short bus bars, to reduce the inductance and resistance between the hot-supply, load, and EVM.

By minimizing the inductance, the rate of load slew can be increased. If assessing the performance over

large transient current spikes (>20 A) is desired, be sure to use a supply with sufficient voltage headroom

to accommodate the series resistance of the wires/bus bars, board planes, and DUT lead frame

resistance. A large capacitor bank between the supply terminals should be used to ensure there is an

adequate charge reservoir available to prevent the supply from drooping and helping supply the large

current inrush through the device.

If assessing temperature performance is desired, use wide, thin bus bars to reduce the thermal sinking

ability of the system and minimize the inductance of the system. While the board provides an onboard

temperature sensor, board temperature may not be an exact indicator of DUT temperature. More precise

measurements can be obtained by placing a layer of thermally conductive grease on top of the DUT

package and placing a thermal sensor directly on the thermal grease.

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Schematics, PCB Layout, and Bill of Materials

SLYU051A–August 2019–Revised March 2020

TMCS1101EVM

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 TMCS1101EVM PCBs.

5.1 Schematics

Figure 2 shows the schematic of the A1B sub board on the TMCS1101EVM PCB. Only the schematic for

the bidirectional A1 (50 mV/A) gain variant is included as all variants use the same circuit and same PCB

layout. All components associated with the 50-mV/A TMCS1101 A1 gain variant have the letter A

appended at the end. The 100-mV/A A2 gain variant has B appended, the 200-mV/A A3 gain variant has

C appended, and the 400-mV/A A4 gain variant has a D appended. All components labeled with a B after

the number correspond to the bidirectional TMCS1101 devices, while all components labeled with a U

after the number correspond to unidirectional TMCS1101 devices.

Figure 2. Schematic for A1 Device

Schematics, PCB Layout, and Bill of Materials

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5.2 PCB Layout

Figure 3 through Figure 6 illustrate the PCB layers of the TMCS1101EVM.

Figure 3. Top Overlay

Figure 4. Top Layer

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