Advertisement
Quick Links
www.ti.com
EVM User's Guide: LM68645EVM
LM68645-Q1 Evaluation Module
Description
The LM68645EVM evaluation module (EVM) helps
designers evaluate the operation and performance
of the LM68645 family of wide input voltage buck
converters. The LM68645EVM is configured to deliver
a 5V output to a load requiring 4.5A or less.
The LM68645EVM can be used in many different
configurations by substituting other versions of the
LM686x5 and re-configuring the board components.
SNVU918 – OCTOBER 2024
Submit Document Feedback
Features
•
3V to 65V wide input voltage range
•
5V, 3.3V, and adjustable output voltage options
•
Up to 4.5A output current
•
300kHz to 2.2MHz switching frequency
•
Minimized switch node ringing to reduce
Electromagnetic Interference (EMI)
•
Input transient capability up to 70V
LM68645EVM
Copyright © 2024 Texas Instruments Incorporated
Description
LM68645-Q1 Evaluation Module
1
Advertisement
Related Manuals for Texas Instruments LM68645EVM
Summary of Contents for Texas Instruments LM68645EVM
- Page 1 300kHz to 2.2MHz switching frequency a 5V output to a load requiring 4.5A or less. • Minimized switch node ringing to reduce The LM68645EVM can be used in many different Electromagnetic Interference (EMI) configurations by substituting other versions of the •...
- Page 2 4.5A of load current from an input voltage as high as 65V. For more details, see Section 1.4. 1.2 Kit Contents This kit includes one LM68645EVM. 1.3 Specification Performance characteristics for the LM68645EVM are found in Table 1-1 Unless otherwise stated: V = 24V, V = 5V, T = 25ºC.
- Page 3 Hardware 2 Hardware 2.1 Additional Images The front and back of the LM68645EVM are shown in Figure 2-1 Figure 2-2, respectively. Figure 2-1. LM68645EVM (Top View) Figure 2-2. LM68645EVM (Bottom View( 2.2 Power Requirements Any power source in the range of 6V to 63V, and capable of delivering 3A, can be used to evaluate the LM68645EVM, under normal conditions.
- Page 4 2.3 Setup and Operation This section describes the connectors, test points, and jumpers on the EVM and how to properly connect, set up, and use the LM68645EVM. For location of connectors and jumpers and typical setup, see Figure 2-3.
- Page 5 Table 4-1. EN jumper = ON VOUT RT jumper = 400kHz MODE jumper = AUTO Input Supply Figure 2-3. LM68645EVM Setup SNVU918 – OCTOBER 2024 LM68645-Q1 Evaluation Module Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 6 Hardware www.ti.com Source T = B/A Frequency Response Analyzer Figure 2-4. LM68645EVM Loop Response Connections LM68645-Q1 Evaluation Module SNVU918 – OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 7 = 5V = 0A to = 24V FPWM Mode = 5V 4.5A (1μs) 4.5A (1μs) Figure 3-6. Load Transient (AUTO) Figure 3-5. Load Transient (FPWM) SNVU918 – OCTOBER 2024 LM68645-Q1 Evaluation Module Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 8 2V/div 20ms/div = 1A = 24V = 5V Figure 3-9. Short Circuit = 4.5A 400kHz = 24V = 5V LM68645EVM Figure 3-10. Thermal Image LM68645-Q1 Evaluation Module SNVU918 – OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 9 Hardware Design Files 4 Hardware Design Files 4.1 Schematics Figure 4-1. LM68645EVM Schematic SNVU918 – OCTOBER 2024 LM68645-Q1 Evaluation Module Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 10 Hardware Design Files www.ti.com 4.2 PCB Layouts Figure 4-2. PCB Top Layer Figure 4-3. PCB Ground Layer (Directly Below Top Layer) LM68645-Q1 Evaluation Module SNVU918 – OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 11 Hardware Design Files Figure 4-4. PCB Signal Layer Figure 4-5. PCB Bottom Layer SNVU918 – OCTOBER 2024 LM68645-Q1 Evaluation Module Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 12 Hardware Design Files www.ti.com 4.3 Bill of Materials (BOM) Table 4-1. LM68645EVM BOM (With Options) Designator Alias Quantity Value Description Part Number Chip Multilayer Ceramic Capacitor for General C3, C4 2.2µF GRM21BD72A225ME01K Purpose 2.2uF ±20% 100V X7T SMD 0805 CAP, AL, 100uF, 63V, +/– 20%, 0.35 ohm,...
- Page 13 Additional Information 5 Additional Information 5.1 Trademarks All trademarks are the property of their respective owners. SNVU918 – OCTOBER 2024 LM68645-Q1 Evaluation Module Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 14 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
- Page 15 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
- Page 16 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
- Page 17 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
- Page 18 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2023, Texas Instruments Incorporated...
- Page 19 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2024, Texas Instruments Incorporated...
Need help?
Do you have a question about the LM68645EVM and is the answer not in the manual?
Questions and answers