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EVM User's Guide: LM74680
LM74680 Evaluation Module for Ideal Diode Bridge
Controller
Description
The LM74680 Evaluation Module (LM74680EVM)
helps designers evaluate the operation and
performance of the LM74680 ideal diode bridge
controller (12-pin DRR package). This evaluation
module demonstrates how an N-channel power
MOSFET driven by LM74680 can emulate a very-low
forward voltage diode and increase the efficiency by a
noticeable factor in bridge rectifiers.
SLUUD73 – DECEMBER 2024
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Features
•
Reverse current blocking feature required for AC
rectification
•
Input reverse battery protection
•
Drives external N-Channel MOSFETs in bridge
configuration
•
Output LED for output high indication
Applications
•
Video doorbells
•
IP cameras
•
Power distribution systems (24Vac)
Figure 1-1. LM74680EVM
Copyright © 2024 Texas Instruments Incorporated
LM74680 Evaluation Module for Ideal Diode Bridge Controller
Description
1
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Summary of Contents for Texas Instruments LM74680
- 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 LM74680 can emulate a very-low • Output LED for output high indication forward voltage diode and increase the efficiency by a Applications noticeable factor in bridge rectifiers.
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Page 2: Kit Contents
LM74680EVM 1.3 Device Information LM74680 is an ideal diode bridge controller that can drive four external N-channel MOSFETs to eliminate traditional diode bridges for superior thermals and efficiency. The top-gates are driven to emulate a very-low forward voltage (11.5mV typ.) diode with low IQ. The wide input supply of 4 V to 72 V allows protection and control of 24Vac systems. - Page 3 Table 2-4. Default Jumper Setting for LM74680EVM Evaluation Board Jumper Default Setting Functionality EN connected to VOUT+. EN pulled high. Output high D4 LED indication. SLUUD73 – DECEMBER 2024 LM74680 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 4 6. Observe the start-up profile of EN, BG1, BG2, TG1, TG2. Figure 2-2 shows an example of power-up with EN profile captured on the LM74680EVM evaluation board. LM74680 Evaluation Module for Ideal Diode Bridge Controller SLUUD73 – DECEMBER 2024 Submit Document Feedback...
- Page 5 Hardware Figure 2-2. LM74680 Power-Up With EN SLUUD73 – DECEMBER 2024 LM74680 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 6 4. Observe the increase in TG1-IN1 and TG2-IN2 voltage levels. Figure 2-3 shows an example of load step profile captured on the LM74680EVM evaluation board. Figure 2-3. Load Step Response of LM74680 Device LM74680 Evaluation Module for Ideal Diode Bridge Controller SLUUD73 – DECEMBER 2024 Submit Document Feedback Copyright ©...
- Page 7 SMBJ45CA 0.1µF 100V CSD88537ND CSD88537ND Exposed_Thermal_Pad LM74680DRRR Green 2.1V 20mA PGND VOUT- TP10 Figure 3-1. LM74680EVM: Evaluation Module Schematic SLUUD73 – DECEMBER 2024 LM74680 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
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Page 8: Pcb Layouts
Figure 3-2. LM74680EVM Board Top Overlay Figure 3-3. LM74680EVM Board Bottom Overlay Figure 3-4. LM74680EVM Board Top Layer Figure 3-5. LM74680EVM Board Bottom Layer LM74680 Evaluation Module for Ideal Diode Bridge Controller SLUUD73 – 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 SLUUD73 – DECEMBER 2024 LM74680 Evaluation Module for Ideal Diode Bridge Controller Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 10 Dir 45V 1.5KW 2-Pin DO214AB SMCJ45CA Littelfuse Inc DO-214AB Diode, TVS, Uni, 58 V, SMBJ58A-13-F Diodes Inc. 93.6 Vc, SMB LM74680 Evaluation Module for Ideal Diode Bridge Controller SLUUD73 – 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. SLUUD73 – DECEMBER 2024 LM74680 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 © 2024, Texas Instruments Incorporated...
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