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EVM User's Guide: LM74681
LM74681 Evaluation Module for Ideal Diode Bridge
Controller
Description
The LM74681 Evaluation Module (LM74681EVM)
helps designers evaluate the operation and
performance of the LM74681 ideal diode bridge
controller (12-pin DRR package). This evaluation
module demonstrates how an N-channel power
MOSFET driven by LM74681 can emulate a very-low
forward voltage diode and helps powering up polarity
agnostic systems with very low I
and classification phase in POE applications.
SLUUD80 – DECEMBER 2024
Submit Document Feedback
during detection
Q
Figure 1-1. LM74681EVM
Copyright © 2024 Texas Instruments Incorporated
Features
•
Reverse current blocking feature required for
polarity agnostic systems
•
Input reverse battery protection
•
Drives external N-Channel MOSFETs in bridge
configuration
•
Output LED for output high indication
Applications
•
PoE powered devices (48V)
•
Polarity agnostic systems
LM74681 Evaluation Module for Ideal Diode Bridge Controller
Description
1
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Summary of Contents for Texas Instruments LM74681
- Page 1 (12-pin DRR package). This evaluation • Drives external N-Channel MOSFETs in bridge module demonstrates how an N-channel power configuration MOSFET driven by LM74681 can emulate a very-low • Output LED for output high indication forward voltage diode and helps powering up polarity Applications...
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Page 2: Kit Contents
This user’s guide describes the LM74681EVM evaluation module for evaluating the performance of the LM74681 Ideal Diode Bridge Controller devices. This document provides EVM configuration information and test setup details for evaluating the LM74681 device. The EVM schematic, board layout, and bill of materials (BOM) are also included. - Page 3 Table 2-4. Default Jumper Setting for LM74681EVM Evaluation Board Jumper Default Setting Functionality EN connected to VOUT+. EN pulled high. Output high D4 LED indication. SLUUD80 – DECEMBER 2024 LM74681 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 4 Figure 2-3 show examples of the UVLO profile captured on the LM74681EVM evaluation board. Figure 2-2. LM74681 Forward Connection UVLO Behavior LM74681 Evaluation Module for Ideal Diode Bridge Controller SLUUD80 – DECEMBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 5 Hardware Figure 2-3. LM74681 Reverse Connection UVLO Behavior SLUUD80 – DECEMBER 2024 LM74681 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 6 2.3.2 Polarity Agnostic Startup Use the following instructions to verify the startup behavior of LM74681. 1. Set the input supply voltage to 48V and current limit of 3A 2. Make sure the J2 jumper setting is set to 2-3.
- Page 7 Gre e n 2.1V 20mA P GND VOUT- TP 4 TP 2 TP10 Figure 3-1. LM74681EVM: Evaluation Module Schematic SLUUD80 – DECEMBER 2024 LM74681 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
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Page 8: Pcb Layouts
Figure 3-3. LM74681EVM Board Bottom Overlay Figure 3-2. LM74681EVM Board Top Overlay Figure 3-5. LM74681EVM Board Bottom Layer Figure 3-4. LM74681EVM Board Top Layer LM74681 Evaluation Module for Ideal Diode Bridge Controller SLUUD80 – DECEMBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated... - Page 9 R1, R2, R3, R4, R5, R6, RES, 0, 5%, 0.1 W, AEC- 0603 ERJ-3GEY0R00V Panasonic Q200 Grade 0, 0603 SLUUD80 – DECEMBER 2024 LM74681 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 10 Q200 Grade 0, 0603 Diode, TVS, Bi, 60 V, 96.8 Vc, SMC (no DO-214AB (no polarity) SMCJ60CA-HRA Littelfuse polarity) LM74681 Evaluation Module for Ideal Diode Bridge Controller SLUUD80 – DECEMBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 11 Additional Information 4 Additional Information Trademarks All trademarks are the property of their respective owners. SLUUD80 – DECEMBER 2024 LM74681 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 12 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 13 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 14 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 15 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 16 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 17 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 © 2025, Texas Instruments Incorporated...
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