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Texas Instruments LM61460-Q1 EVM User Manual Download Page 12

LM61460EVM Board Test Results

www.ti.com

12

SNVU621C – May 2019 – Revised December 2019

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Copyright © 2019, Texas Instruments Incorporated

LM61460-Q1 EVM User's Guide

Figure 18. Radiated EMI Measurement with Horizontal Log

Antenna Under CISPR 25 Class 5 Limits

Figure 19. Radiated EMI Measurement with Vertical Log

Antenna Under CISPR 25 Class 5 Limits

Figure 20. Radiated EMI Measurement with Rod Antenna Under CISPR 25 Class 5 Limits

6.3

Board Efficiency

This section provides efficiency plots for the board with LM61460AAS populated for Auto mode efficiency
and LM61460AFS populated for FPWM mode efficiency. For 2-MHz data, the output stage has to be
changed from the default BOM. The inductor (L1) selected was XEL5030-102MEB.

Summary of Contents for LM61460-Q1 EVM

Page 1: ... EVM implements the LM61460 Q1 in a 14 pin wettable flanks Hotrod package as shown in Table 1 It is capable of delivering 5 V output voltage and up to 6 A load current with exceptional efficiency and output accuracy in a very small solution size The EVM provides multiple power connectors and test points It also provides a good layout example which is optimized for EMI and thermal performance Table...

Page 2: ...nt and is peak current limit controlled The following are additional features that provide both flexible and easy to use solutions for a wide range of applications Adjustable switching frequency Synchronization to an external clock FPWM variant LM61460AFS Power good flag Precision enable Automatic frequency foldback at light load and optional external bias improve efficiency over the entire load r...

Page 3: ...FPWM SPREAD SPECTRUM LM61460EV M AS 400K LM61460AA SQRJRRQ1 6 A 400 kHz 3 to 36 V 5 V Enabled Disabled Enabled LM61460EV M FS 400K LM61460AF SQRJRRQ1 6 A 400 kHz 3 to 36 V 5 V Disabled Enabled Enabled 2 Quick Start 1 Connect the voltage supply between the VIN and GND connectors or between VIN_EMI and GND_EMI to include the on board input filter in the input path Use short and thick gauge wires to ...

Page 4: ...t may cause burns Do not touch Quick Start www ti com 4 SNVU621C May 2019 Revised December 2019 Submit Documentation Feedback Copyright 2019 Texas Instruments Incorporated LM61460 Q1 EVM User s Guide Figure 5 Top View of LM61460 Q1 EVM ...

Page 5: ...n between the cable parasitic inductance and the low ESR ceramic capacitors VIN_EMI Input voltage to input filter of the converter If the input filter is desired between the supply and the LM61460 Q1 connect the supply voltage between VIN_EMI and GND_EMI The supply voltage must be connected to the board with short and thick wires to handle pulsing input current The input filter consists of the fol...

Page 6: ...ce when the output voltage is in regulation Vinj To aid when making bode plots There is a low value resistor Rinj between VOUT and this node This feedback divider of the board is connected to this node as well Stimulus can be applied between this node and VOUT when taking measurements for bode plots VOUTS Kelvin sensing for VOUT This connector is provided to allow VOUT to be measured more accurate...

Page 7: ... 6 LM61460 AS 400K Rev A EVM 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 ...

Page 8: ...figurations Table 3 Different BOM Configurations VOUT FREQUENCY RFBB RT COUT CIN CHF L1 3 3 V 400 kHz 43 2 kΩ 33 2 kΩ 6 x 22 µF 2 x 4 7 µF 2 x 100 nF 4 7 µH XHMI6060 3 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 ...

Page 9: ...enable pin Set frequency External clock synchronization The 14 pin Hotrod package offers a very small size and low noise solution 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 to connect to all four layers Test points have been provided for ease of use to connect the power sup...

Page 10: ... temp with a 5 V 6 A load The device was soaked for 30 minutes to obtain accurate measurement Figure 13 Thermal Image Capture of IC at VIN 13 5 V VOUT 5 V Load 6 A NOTE Thermal image captures top of case temperature This is essentially junction 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 headro...

Page 11: ...User s Guide Figure 14 Conducted EMI Measurement with CISPR 25 Class 5 Limit Lines 150 kHz to 30 MHz Figure 15 Conducted EMI Measurement with CISPR 25 Class 5 Limit Lines 30 MHz to 110 MHz Figure 16 Radiated EMI Measurement with Horizontal Bicon Antenna Under CISPR 25 Class 5 Limits Figure 17 Radiated EMI Measurement with Vertical Bicon Antenna Under CISPR 25 Class 5 Limits ...

Page 12: ... 5 Limits Figure 19 Radiated EMI Measurement with Vertical Log Antenna Under CISPR 25 Class 5 Limits Figure 20 Radiated EMI Measurement with Rod Antenna Under CISPR 25 Class 5 Limits 6 3 Board Efficiency This section provides efficiency plots for the board with LM61460AAS populated for Auto mode efficiency and LM61460AFS populated for FPWM mode efficiency For 2 MHz data the output stage has to be ...

Page 13: ...5 V VIN 24 V Load Current A Efficiency 0 0001 0 001 0 01 0 1 0 2 0 5 1 2 3 5 710 60 65 70 75 80 85 90 95 100 LM61 VIN 8 V VIN 13 5 V VIN 24 V 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 www ti com LM61460EVM Board Test Results 13 SNVU621C May 2019 Revised December 2019 Submit Documentation Feedback Copyright 2019 Texas Instruments In...

Page 14: ...rent 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 LM61460EVM Board Test Results www ti com 14 SNVU621C May 2019 Revised December 2019 Submit Documentation Feedback Copyright 2019 Texas Instruments Incorporated LM61460 Q1 EVM User s Guide Figure 27 FSW 2 2 MHz 3 3 VOUT Auto Mode Figure 28 FSW 2 2 MHz 3 3 VOUT FPWM Mode 6 4 Load Regulation This sect...

Page 15: ...1 SNVS VIN 8 V VIN 13 5 V VIN 24 V 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 11 SNVS VIN 8 V VIN 13 5 V VIN 24 V www ti com LM61460EVM Board Test Results 15 SNVU621C May 2019 Revised December 2019 Submit Documentation Feedback Copyright 2019 Texas Instruments Incorporated LM61460 Q1 EVM User s Guide Figure 33 FSW 2 2 MHz 5 VOUT Auto Mode Figure 34 ...

Page 16: ...16 V 10 X7R 0603 0603 885012206052 Wurth Elektronik C16 1 22 pF CAP CERM 22 pF 50 V 5 C0G NP0 AEC Q200 Grade 1 0603 0603 CGA3E2C0G1H220J080 AA TDK C17 C18 C19 C20 4 2 2 µF CAP CERM 2 2 µF 50 V 10 X7R AEC Q200 Grade 1 0805 0805 CGA4J3X7R1H225K125 AB TDK C21 C22 2 0 47 µF CAP CERM 0 47 µF 50 V 10 X7R AEC Q200 Grade 1 0603 0603 CGA3E3X7R1H474K080 AE TDK J1 J2 J3 3 Terminal Block 5 mm 2x1 Tin TH Termi...

Page 17: ... TP7 2 Test Point Multipurpose Orange TH Orange Multipurpose Testpoint 5013 Keystone TP8 TP10 2 Test Point Multipurpose White TH White Multipurpose Testpoint 5012 Keystone U1 changes based on EVM variant 1 Automotive 6 A Low Noise Synchronous Buck Regulators RJR0014A VQFN HR 14 RJR0014A LM61460AASQRJRRQ1 LM61460EVM AS 400K or LM61460AFSQRJRRQ1 LM61460EVM FS 400K Texas Instruments C10 C11 0 22 µF C...

Page 18: ...rom B Revision November 2019 to C Revision Page Added Section 4 1 8 Added plots to Section 6 2 10 Added Section 6 3 12 Added Section 6 4 14 Changes from A Revision September 2019 to B Revision Page Updated Figure 5 through Figure 12 to match the revised EVM design 4 Added Figure 20 through Figure 15 10 Changes from Original May 2019 to A Revision Page Changed Figure 5 through Figure 12 4 Changed c...

Page 19: ...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 20: ... 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 21: ...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 22: ... 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 23: ...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 24: ...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...

Page 25: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LM61460EVM AS 400K ...

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