Texas Instruments LMQ61460EVM-400K User Manual Download Page 7 | Manualshive

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background image

4 Schematic

The bill of materials is tabulated in

shows the corresponding schematic.

Figure 4-1. LMQ61460EVM-400K Schematic

Note

Long leads and additional inductance in used to power the DC/DC may cause issues for ideal device operation. RD2, CD2, RD1, and CD1 are
placeholders for damping networks to be populated. For more information regarding this topic, reference the

EMI Filter Components and Their

Nonidealities for Automotive DC/DC Regulators Technical Brief

Schematic

SNVU698B – SEPTEMBER 2020 – REVISED DECEMBER 2020

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LMQ61460EVM-400K User's Guide

7

Copyright © 2021 Texas Instruments Incorporated

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Summary of Contents for LMQ61460EVM-400K

Page 1: ... exceptional efficiency and output accuracy in a very small solution size The EVM provides multiple power connectors and test points In addition to an optimized EMI board layout the LMQ61460 Q1 utilizes integrated bypass capacitors which results in great EMI performance Table 1 1 Device and Package Configurations CONVERTER IC PACKAGE U1 LMQ61460 Q1 14 pin wettable flanks Hotrod package 4 0 mm 3 5 ...

Page 2: ...oard Test Results 12 6 1 EMI 12 6 2 Board Efficiency 13 6 3 Load Regulation 14 6 4 Thermals 15 7 Bill of Materials 17 8 Revision History 19 Trademarks Hotrod is a trademark of Texas Instruments All trademarks are the property of their respective owners Table of Contents www ti com 2 LMQ61460EVM 400K User s Guide SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback Copyright 2021 ...

Page 3: ...Q61460AFS IC swap Power good flag PG jumper Precision enable EN jumper with RENT and RENB resistors Automatic frequency foldback at light load and optional external bias improve efficiency over the entire load range The device requires few external components and has a pinout designed for optimal EMI and thermal performance Protection features include the following Thermal shutdown Input undervolt...

Page 4: ...rrent Set the current limit of the supply to an appropriate level to supply needed current and protection 4 Turn on the power supply With the default configuration the EVM powers up and provides VOUT equal to 5 V 5 Monitor the output voltage with sense points The maximum load current is 6 A with the LMQ61460 Q1 Note that the maximum output current may need to derate if ambient temperature is high ...

Page 5: ... oscillation between the cable parasitic inductance and the existing low ESR ceramic capacitors VIN_EMI Low EMI option If the input filter is required connect the supply voltage between VIN_EMI and GND_EMI The supply voltage must be connected to the board with short and thick wires The input filter consists of the following CF1 CF2 CF3 CF4 CF5 CF6 and L2 CD1 CD2 RD1 and RD2 are provided to allow m...

Page 6: ... value resistor Rinj is placed between VOUT and this node The feedback divider of the board is connected to this node An AC signal is applied across Rinj when taking measurements for bode plots VOUTS VOUT sense This connector is provided for measuring the output voltage accurately VINS VIN sense This connector is provided for measuring the input voltage accurately Detailed Descriptions www ti com ...

Page 7: ...use issues for ideal device operation RD2 CD2 RD1 and CD1 are placeholders for damping networks to be populated For more information regarding this topic reference the EMI Filter Components and Their Nonidealities for Automotive DC DC Regulators Technical Brief www ti com Schematic SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback LMQ61460EVM 400K User s Guide 7 Copyright 2021...

Page 8: ... 3 V 2100 kHz 43 2 kΩ 6 04 kΩ 3 x 22 µF 2 x 4 7 µF 2 x 100 nF 1 µH XEL5030 5 V 400 kHz 24 9 kΩ 33 2 kΩ 4 x 22 µF 2 x 4 7 µF 2 x 100 nF 4 7 µH XHMI6060 5 V 2100 kHz 24 9 kΩ 6 04 kΩ 3 x 22 µF 2 x 4 7 µF 2 x 100 nF 1 µH XEL5030 Schematic www ti com 8 LMQ61460EVM 400K User s Guide SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 9: ... 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 route signals and dissipate heat with an array of thermal vias to connect to all four layers Test points have been provided for ease of use to connect the power supply and required load and to monitor critical signals The board measures 3 00 x 4 00 76mm x 101mm Figure 5 1 To...

Page 10: ...ayer Figure 5 3 Signal Layer 1 Ground Plane Board Layout www ti com 10 LMQ61460EVM 400K User s Guide SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 11: ...al Layer 2 Routing Figure 5 5 Bottom Layer www ti com Board Layout SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback LMQ61460EVM 400K User s Guide 11 Copyright 2021 Texas Instruments Incorporated ...

Page 12: ...30 MHz Figure 6 2 Conducted EMI Measurement with CISPR 25 Class 5 Limit Lines 30 MHz to 108 MHz Figure 6 3 Radiated EMI Measurement with Horizontal Bicon Antenna Under CISPR 25 Class 5 Limits Figure 6 4 Radiated EMI Measurement with Vertical Bicon Antenna Under CISPR 25 Class 5 Limits LMQ61460EVM 400K Board Test Results www ti com 12 LMQ61460EVM 400K User s Guide SNVU698B SEPTEMBER 2020 REVISED DE...

Page 13: ... 85 90 95 100 LM61 VIN 8 V VIN 13 5 V VIN 24 V Figure 6 7 FSW 400 kHz 5 VOUT Auto Mode Load Current A Efficiency 0 1 2 3 4 5 6 7 50 55 60 65 70 75 80 85 90 95 100 LM61 VIN 8 V VIN 13 5 V VIN 24 V Figure 6 8 FSW 400 kHz 5 VOUT FPWM Mode Output Current A Efficiency 0 001 0 010 02 0 05 0 1 0 2 0 5 1 2 3 45 7 10 60 65 70 75 80 85 90 95 100 LM61 VIN 8 V VIN 13 5 V VIN 24 V Figure 6 9 FSW 400 kHz 3 3 VO...

Page 14: ...VOUT FPWM Mode 6 3 Load Regulation This section provides efficiency plots for the board with LMQ61460AAS populated for Auto mode efficiency and LMQ61460AFS populated for FPWM mode efficiency For 2 1 MHz data the output stage has to be changed from the default BOM The inductor L1 selected was XEL5030 102MEB Output Current A Output Voltage V 0 1 2 3 4 5 6 7 4 95 4 97 4 99 5 01 5 03 5 05 5 07 5 09 5 ...

Page 15: ...5 07 5 09 5 11 SNVS VIN 8 V VIN 13 5 V VIN 24 V Figure 6 20 FSW 2 1 MHz 5 VOUT FPWM Mode Output Current A Output Voltage V 0 1 2 3 4 5 6 7 3 29 3 31 3 33 3 35 3 37 SNVS VIN 8 V VIN 13 5 V VIN 24 V Figure 6 21 FSW 2 1 MHz 3 3 VOUT Auto Mode Output Current A Output Voltage V 0 1 2 3 4 5 6 7 3 29 3 31 3 33 3 35 3 37 SNVS VIN 8 V VIN 13 5 V VIN 24 V Figure 6 22 FSW 2 1 MHz 3 3 VOUT FPWM Mode 6 4 Therm...

Page 16: ...temperature as the case package is very thin resulting in low psi jt This demonstrates device capability of operating greater than 85 C ambient with headroom LMQ61460EVM 400K Board Test Results www ti com 16 LMQ61460EVM 400K User s Guide SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 17: ...3 CGA3E3X7R1H474K080 AE TDK J1 J2 J3 3 Terminal Block 5 mm 2x1 Tin TH Terminal Block 5 mm 2x1 TH 691 101 710 002 Wurth Elektronik J4 1 Header 100 mil 3x1 Gold TH Header 100 mil 3x1 TH HTSW 103 07 G S Samtec L1 1 4 7 µH Inductor Shielded Hyperflux 4 7 µH 7 4 A 0 0143 Ω SMD 6 65x6 45 mm 74439346047 Wurth Elektronik L2 1 1 2 µH Shielded Molded Inductor 7 5 A 11 3 mΩ Max 2 SMD SMD2 744316220 Wurth Ele...

Page 18: ... Buck Regulators RJR0014A VQFN HR 14 RJR0014A LMQ61460AASQRJRRQ 1 Texas Instruments C10 C11 0 22 µF CAP CERM 22 µF 16 V 20 X7R AEC Q200 Grade 1 1210 1210 CGA6P1X7R1C226M250 AC TDK C14 0 1 µF CAP CERM 1 µF 10 V 10 X7R 0603 0603 GRM188R71A105KA61D MuRata C23 C24 0 1 µF CAP CERM 1 µF 50 V 10 X7R 0603 0603 UMK107AB7105KA T Taiyo Yuden FID1 FID2 FID3 FID4 FID5 FID6 0 Fiducial mark There is nothing to b...

Page 19: ...ciency Curve 5V 2 1MHz FPWM 13 Changes from Revision March 2020 to Revision A September 2020 Page Changed image from 3D imaging to a physical board image 1 Added Board Efficiency 13 Added Load Regulation 14 Added Thermals 15 www ti com Revision History SNVU698B SEPTEMBER 2020 REVISED DECEMBER 2020 Submit Document Feedback LMQ61460EVM 400K User s Guide 19 Copyright 2021 Texas Instruments Incorporat...

Page 20: ...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...

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