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User’s Guide

OPA455EVM Evaluation Module

ABSTRACT

This user's guide describes the characteristics, operation, and use of the evaluation module (EVM) for the
OPA455. The EVM is designed to evaluate the performance of the devices in both single and dual-supply
configurations. This document also includes the schematic, printed circuit board (PCB) layout, and a bill of
materials (BOM). Throughout this document the terms

evaluation board

,

evaluation module

, and

EVM

are

synonymous with OPA455EVM.

WARNING

Danger: HIGH VOLTAGE! This evaluation board is intended for professional use only. It has exposed
high voltages. Do not operate this board without proper high-voltage/high-current safety practices.
Read

before using the EVM.

SBOU240 – OCTOBER 2020

Submit Document Feedback

OPA455EVM Evaluation Module

1

Copyright © 2020 Texas Instruments Incorporated

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Summary of Contents for OPA455EVM

Page 1: ...t board PCB layout and a bill of materials BOM Throughout this document the terms evaluation board evaluation module and EVM are synonymous with OPA455EVM WARNING Danger HIGH VOLTAGE This evaluation board is intended for professional use only It has exposed high voltages Do not operate this board without proper high voltage high current safety practices Read Section 1 4 before using the EVM www ti...

Page 2: ...atic 10 4 2 EVM Default Configuration 11 4 3 PCB Layout 12 4 4 Bill of Materials 13 List of Figures Figure 3 1 Practical 20 mA Improved Howland Current Pump Circuit 7 Figure 3 2 Improved Howland Current Pump Output Voltage Compliance Range 8 Figure 3 3 Improved Howland Current Pump Applied as a Peak AC Current Generator 9 Figure 4 1 OPA455EVM Schematic 10 Figure 4 2 OPA455EVM Default Configuration...

Page 3: ...1 OPA455EVM BOM 13 Trademarks PowerPAD is a trademark of Texas Instruments All other trademarks are the property of their respective owners www ti com Trademarks SBOU240 OCTOBER 2020 Submit Document Feedback OPA455EVM Evaluation Module 3 Copyright 2020 Texas Instruments Incorporated ...

Page 4: ...Document Literature Number OPA455 Product Data Sheet SBOSA16 OPA462 Product Data Sheet SBOS803 OPA445 Product Data Sheet SBOS156 1 4 Evaluation Module Limitations and Cautions The OPA455EVM is designed to safely withstand the maximum rated supply input and output voltages and current levels specified for the OPA455 high voltage op amp In addition to observing maximum voltage and current limitation...

Page 5: ...mmon mode voltage range BNC connectors are available at both inputs to allow for easy interfacing with signal generators or other equipment Additionally signals can be input using test points TP12 IN and TP14 IN Jumpers J7 and J10 set the voltages seen at IN and IN respectively Short pins 2 and 3 of these jumpers to set the inputs to GND Short pins 1 and 2 to allow whatever voltages present at the...

Page 6: ...t allows the pin to be easily interfaced with standard low voltage logic The pin goes active if the junction temperature of the device rises to greater than 150 C and resets after the device cools to 130 C Additionally the pin goes active if the device attempts to source more than the maximum continuous current of 30 mA The status flag can be monitored from TP2 and an external pullup voltage can b...

Page 7: ...rent The resistor and capacitor labels correspond to those screened on the OPA455EVM printed circuit board As shown in Figure 3 1 when RL is equal to 500 Ω the sourced output current level is 20 mA and Vout is 10 V as Ohm s law dictates Figure 3 1 Practical 20 mA Improved Howland Current Pump Circuit Practical current sources have a limited output voltage range that can be provided The OPA455 op a...

Page 8: ...stant current Figure 3 2 Improved Howland Current Pump Output Voltage Compliance Range The improved Howland current pump can be used to generate an ac waveform with a peak current that corresponds to a maximum specified DC value A 20 mA DC current source using the OPA455 has been demonstrated and will now be used to show how a 20 mA peak AC current waveform can be realized Application Circuits www...

Page 9: ...margin should be sufficient such that the circuit is stable However if the output load is complex containing both resistive and reactive components R jX there can be combinations that degrade the phase margin and instability results Degradation of the phase margin often occurs when the current pump is used to drive loads that are predominantly inductive The OPA455EVM has a number of positions wher...

Page 10: ...tics and PCB layout 4 1 EVM Schematic Figure 4 1 depicts the complete OPA455EVM schematic Figure 4 1 OPA455EVM Schematic Schematic PCB Layout and Bill of Materials www ti com 10 OPA455EVM Evaluation Module SBOU240 OCTOBER 2020 Submit Document Feedback Copyright 2020 Texas Instruments Incorporated ...

Page 11: ...or the default configuration Any components shown on the complete schematic but not on this schematic are optional and not installed Figure 4 2 OPA455EVM Default Configuration www ti com Schematic PCB Layout and Bill of Materials SBOU240 OCTOBER 2020 Submit Document Feedback OPA455EVM Evaluation Module 11 Copyright 2020 Texas Instruments Incorporated ...

Page 12: ...to scale This figure is intended to show how the board is laid out and is not intended to be used for manufacturing OPA455EVM PCBs Schematic PCB Layout and Bill of Materials www ti com 12 OPA455EVM Evaluation Module SBOU240 OCTOBER 2020 Submit Document Feedback Copyright 2020 Texas Instruments Incorporated ...

Page 13: ...e J1 J2 J11 3 Terminal Block 2x1 6 35mm Green TH 1714955 Phoenix Contact J3 J4 J5 J7 J10 J12 6 Header 2 54mm 3x1 Tin TH 68001 403HLF FCI J6 J8 J9 3 BNC Low Profile Elbow Jack Gold R A TH 5 1634513 1 TE Connectivity R1 R8 R13 3 RES 0 5 0 1 W 0603 RC0603JR 070RL Yageo R2 R3 2 RES 100 k 1 0 1 W AEC Q200 Grade 0 0603 CRCW0603100KFKEA Vishay Dale R4 1 RES 10 0 k 0 1 0 1 W 0603 RG1608P 103 B T5 Susumu C...

Page 14: ...02KCRACTU Kemet optional not installed FID1 FID2 FID3 0 Fiducial mark There is nothing to buy or mount N A N A optional not installed Q1 Q2 0 JFET 2 CH N CH V A SOIC 8 IF1322A InterFET optional not installed R5 R11 R12 0 RES 10 0 k 0 1 0 1 W 0603 RG1608P 103 B T5 Susumu Co Ltd optional not installed R9 R10 0 RES 4 70 k 1 1 W AEC Q200 Grade 0 2512 CRCW25124K70FKEG Vishay Dale optional not installed...

Page 15: ...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...

Page 16: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Page 17: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Page 18: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Page 19: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Page 20: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...

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