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Figure 4-2. Mid-Layer 1 Ground Plane

Figure 4-3. Mid-Layer 2 Routing

PCB Layout

SNVU817 – NOVEMBER 2021

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LMR38020QEVM User Guide

9

Copyright © 2021 Texas Instruments Incorporated

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Содержание LM38020QEVM

Страница 1: ...r the LMR38020 Q1 as well as the LMR38020 buck converter See Table 1 1 for package information Table 1 1 Device and Package Configurations CONVERTER IC PACKAGE U1 LMR38020 Q1 8 pin SO package with PowerPAD 4 89 mm 3 90 mm LMR38020 Table of Contents 1 General TI High Voltage Evaluation User Safety Guidelines 2 2 LMR38020 Q1 Evaluation Module 4 2 1 Quick Start Procedure 4 2 2 Detailed Descriptions 5...

Страница 2: ...TI HV EVM and its interface electronics are energized indicating operation of accessible high voltages can be present for the purpose of protecting inadvertent access All interface circuits power supplies evaluation modules instruments meters scopes and other related apparatus used in a development environment exceeding 50 VRMS 75 VDC must be electrically located within a protected Emergency Power...

Страница 3: ...age DC supply Please read this user s guide and the safety related documents that come with the EVM package before operating this EVM CAUTION Do not leave the EVM powered when unattended WARNING Hot surface Contact may cause burns Do not touch WARNING High Voltage Electric shock is possible when connecting board to live wire Board should be handled with care by a professional For safety use of iso...

Страница 4: ...ure 1 Connect the voltage supply between VIN and GND connectors using short wires 2 Connect the load of the converter between VOUT and GND connectors using short wires 3 Set the supply voltage VIN at an appropriate level between 6 V to 80 V Set the current limit of the supply to an appropriate level as well 4 Turn on the power supply The EVM powers up and provides VOUT 5 V 5 Monitor the output vol...

Страница 5: ...8020 Q1 connect the supply voltage between VIN_EMI and GND on the bottom layer The supply voltage should be connected to the board with short wires The EMI filter components were not assembled on this evaluation board EMI GND Ground connection near the input EMI filter This is the current return path for the supply connected to VIN_EMI It provides a direct connection to the input filter capacitors...

Страница 6: ...drain output that is tied to voltage below 20 V through pullup resistor R10 Header J6 Measure VOUT and loop response J6 PIN 2 VO_S is connected to the output for output voltage sensing and efficiency measurement PIN 1 VINJ is connected to the noise injection resistor R3 The loop response can be measured on J6 LMR38020 Q1 Evaluation Module www ti com 6 LMR38020QEVM User Guide SNVU817 NOVEMBER 2021 ...

Страница 7: ...3 Schematic Figure 3 1 LMR38020QEVM Schematic www ti com Schematic SNVU817 NOVEMBER 2021 Submit Document Feedback LMR38020QEVM User Guide 7 Copyright 2021 Texas Instruments Incorporated ...

Страница 8: ...ermal performance The PCB consists of a 4 layer design There are 2 oz copper planes on the top and bottom and 1 oz copper mid layer planes to dissipate heat with an array of thermal vias under the thermal pad to connect to all four layers Test points have been provided for ease of use to connect the power supply required load and to monitor critical signals Figure 4 1 Top Layer and Silkscreen Laye...

Страница 9: ...ure 4 2 Mid Layer 1 Ground Plane Figure 4 3 Mid Layer 2 Routing www ti com PCB Layout SNVU817 NOVEMBER 2021 Submit Document Feedback LMR38020QEVM User Guide 9 Copyright 2021 Texas Instruments Incorporated ...

Страница 10: ...Figure 4 4 Bottom Layer Routing PCB Layout www ti com 10 LMR38020QEVM User Guide SNVU817 NOVEMBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 11: ...6 Header 100 mil 2 1 Gold TH TSW 102 07 G S Samtec 4 L1 FIXED IND 16 μH 5 A SMD 7443251600 Wurth 1 Fixed Inductors IND MP 15 μH 4 6 A HCM1A0805V2 150 R Coiltronics R2 RES 0 5 0 063 W AEC Q200 Grade 0 CRCW06030000Z0EA Vishay 1 R5 R6 RES 115 k 1 0 1 W 0603 CRCW0603115KFKEA Vishay 2 R8 RES 1 05 k 1 0 1 W 0603 RC0603FR 07226KL Vishay 1 R9 R10 RES 28 7 k 1 0 1 W 0603 CRCW060328K7FKEAv Vishay 2 R3 RES 5...

Страница 12: ...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...

Страница 13: ... 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...

Страница 14: ...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...

Страница 15: ... 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...

Страница 16: ...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...

Страница 17: ...o 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 and you will fully indemn...

Страница 18: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LMR38020QEVM ...

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