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3.2 Startup Reverse Polarity (–12 V)

• A –12-V source is connected to the VIN input of the LM74701-Q1EVM.
•

Figure 3-2

shows that the output voltage remains at a constant 0 V in this situation.

• This test simulates the event of connecting a 12-V battery in the reverse direction; therefore, protecting the

load from negative input voltages.

Figure 3-2. Startup Reverse Polarity (–12 V)

LM74701-Q1EVM Performance Capture

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LM74701-Q1EVM User Guide

SNOU180A – JUNE 2021 – REVISED SEPTEMBER 2021

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Содержание LM74701-Q1EVM

Страница 1: ...ayout Guidelines 8 4 1 PCB Drawings 8 4 2 Bill of Materials 9 5 Revision History 11 List of Figures Figure 2 1 LM74701 Q1EVM Typical Application Circuit 2 Figure 2 2 LM74701 Q1EVM 3 Figure 2 3 LM74701 Q1EVM Schematic 4 Figure 3 1 LM74701 Q1EVM Startup 5 Figure 3 2 Startup Reverse Polarity 12 V 6 Figure 3 3 Response to ISO 7637 2 Pulse 1 7 Figure 4 1 LM74701 Q1EVM Top Side Placement 8 Figure 4 2 LM...

Страница 2: ...his section describes the jumpers and connectors on the EVM and how to properly connect setup and use the LM74701 Q1EVM Ensure the power supply is turned off while making connections on the board 2 1 I O Connector Description VIN J1 Power input connector to the positive rail of the input power supply GND1 J3 Ground connection for the power supply VOUT J2 Power output connector to the positive side...

Страница 3: ...nducted with 3 A constant current as the load and 12 V at the input Make sure that the external power supply source for the input voltage is capable of providing enough current to the output load so that the output voltage can be obtained When all connections to the LM74701 Q1EVM are verified apply power to VIN Figure 2 2 captures EVM board setup Figure 2 2 LM74701 Q1EVM www ti com Setup SNOU180A ...

Страница 4: ... 100V 4 7uF C2 91k R1 9 1k R2 BATT_MON ANODE 2 CATHODE 8 EN 6 GATE 1 NC 7 SW 4 VCAP 3 GND 5 LM74701QDDFQ1 U1 0 1uF C1 1 2 3 J5 PEC03SAAN SGND 2 2uH L1 1 3 2 SQD97N06 6M3L GE3 DNP 4 1 5 2 3 Q1 SQJ460AEP T1_GE3 58V D2 SMAJ58A DNP Figure 2 3 LM74701 Q1EVM Schematic Setup www ti com 4 LM74701 Q1EVM User Guide SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback Copyright 2021 Texas Instr...

Страница 5: ... gate voltage CH3 comes up after input voltage crosses device PoR threshold The gate of external N FET is fully enhanced and FET is turned on Output voltage CH1 rises smoothly from 0 V to 12 V Figure 3 1 LM74701 Q1EVM Startup www ti com LM74701 Q1EVM Performance Capture SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback LM74701 Q1EVM User Guide 5 Copyright 2021 Texas Instruments In...

Страница 6: ...ituation This test simulates the event of connecting a 12 V battery in the reverse direction therefore protecting the load from negative input voltages Figure 3 2 Startup Reverse Polarity 12 V LM74701 Q1EVM Performance Capture www ti com 6 LM74701 Q1EVM User Guide SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 7: ...h 100 V ISO7637 2 pulse 1 transient For additional information on device EMC performance refer to the data sheet application section www ti com LM74701 Q1EVM Performance Capture SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback LM74701 Q1EVM User Guide 7 Copyright 2021 Texas Instruments Incorporated ...

Страница 8: ...01 Q1EVM Top Side Placement Figure 4 2 LM74701 Q1EVM Bottom Side Placement Figure 4 3 LM74701 Q1EVM Top Layer Routing Figure 4 4 LM74701 Q1EVM Bottom Layer Routing EVM Board Assembly Drawings and Layout Guidelines www ti com 8 LM74701 Q1EVM User Guide SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Страница 9: ...dial J16 EEV FK1J471M Panasonic C4 C5 2 0 33uF CAP CERM 0 33 µF 50 V 10 X8R AEC Q200 Grade 0 1206 1206 CGA5L2X8R1H334K160A A TDK GND1 GND2 2 TEST POINT SLOTTED 11 8 TH Test point TH Slot Test point 1040 Keystone H1 H2 H3 H4 4 Machine Screw Round 4 40 x 1 4 Nylon Philips panhead Screw NY PMS 440 0025 PH B F Fastener Supply H5 H6 H7 H8 4 Standoff Hex 0 5 L 4 40 Nylon Standoff 1902C Keystone J1 J2 J3...

Страница 10: ... 1 k 5 0 1 W AEC Q200 Grade 0 0603 0603 CRCW06039K10JNEA Vishay Dale SH J1 1 1x2 Shunt 100mil Flash Gold Black Closed Top 100mil Shunt SPC02SYAN Sullins Connector Solutions U1 1 Low IQ Reverse Battery Protection Ideal Diode Controller with Integrated VDS Clamp SOT23 8 LM74701QDDFQ1 Texas Instruments D2 0 58V Diode TVS Uni 58 V SMA SMA SMAJ58A Diodes Inc FID1 FID2 FID3 FID4 FID5 FID6 0 Fiducial mar...

Страница 11: ...Revision A September 2021 Page Updated Figure 2 2 3 Updated Figure 2 3 4 Added ISO 7637 2 Pulse 1 Performance section 7 Updated Figure 4 1 through Figure 4 4 8 Updated Table 4 1 9 www ti com Revision History SNOU180A JUNE 2021 REVISED SEPTEMBER 2021 Submit Document Feedback LM74701 Q1EVM User Guide 11 Copyright 2021 Texas Instruments Incorporated ...

Страница 12: ...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...

Страница 13: ... 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...

Страница 14: ...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...

Страница 15: ... 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...

Страница 16: ...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...

Страница 17: ...s 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 and you wi...

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