Texas Instruments LM74700EVM Bedienungsanleitung

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

User's Guide

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

This user’s guide describes the evaluation module (EVM) for TI's ideal diode controller, LM74700-Q1. This

document provides configuration information and test setup details for evaluating LM74700-Q1 devices.

An EVM schematic, board layout images, and bill of materials (BOM) are included.

Contents

1 Introduction ................................................................................................................... 2

2 Setup .......................................................................................................................... 2

2.1 I/O Connector Description ......................................................................................... 2

2.2 Board Setup ......................................................................................................... 3

2.3 Schematic............................................................................................................ 4

3 Operation ..................................................................................................................... 5

3.1 Reverse Polarity Protection ....................................................................................... 5

3.2 ORing Application .................................................................................................. 6

4 EVM Board Assembly Drawings and Layout Guidelines ............................................................... 7

4.1 PCB Drawings....................................................................................................... 7

4.2 Bill of Materials .................................................................................................... 11

List of Figures

1 LM74700EVM Typical Application Circuit ................................................................................ 2

2 LM74700EVM ................................................................................................................ 3

3 LM74700EVM Schematic .................................................................................................. 4

4 Reverse Polarity 12 V to –12 V ........................................................................................... 5

5 Startup Reverse Polarity (–12 V) .......................................................................................... 5

6 ORing Application – Higher Supply Switchover ......................................................................... 6

7 ORing Application 12-V – Lower Supply Test ........................................................................... 6

8 LM74700EVM Top Side Placement....................................................................................... 7

9 LM74700EVM Bottom Side Placement................................................................................... 8

10 LM74700EVM Top Layer Routing......................................................................................... 9

11 LM74700EVM Bottom Layer Routing.................................................................................... 10

List of Tables

1 Bill of Materials ............................................................................................................. 11

Trademarks

All trademarks are the property of their respective owners.

LM74700

GATE CATHODE

ANODE

VCAP GND

VBAT TVS

Voltage

Regulator

Introduction

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LM74700 Evaluation Module

1 Introduction

TI's LM74700 evaluation module (LM74700EVM) helps designers evaluate the operation and performance

of the LM74700-Q1 ideal diode controller. This evaluation module demonstrates how an N-channel power

MOSFET can emulate a very-low forward voltage diode with low IQand low-leakage current flowing

through the IC. In this design scheme, the LM74700-Q1 is combined with a MOSFET and used in series

with a battery as a replacement for a Schottky diode and PFET, in reverse-polarity protection circuitry as

shown in Figure 1. For more information on the LM74700 functional and electrical characteristics, see

LM74700-Q1 Low IQreverse battery protection ideal diode controller.

2 Setup

This section describes the jumpers and connectors on the EVM, and how to properly connect, setup, and

use the LM74700EVM. 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 of the load

•GND2 J4: Ground connection for the load

•Test Points: VIN, VOUT, GND1, and GND2 are test points

Figure 1. LM74700EVM Typical Application Circuit

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Setup

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

2.2 Board Setup

Before applying power to the LM74700EVM, verify all external connections. Turn off external power

supplies and connect them with the proper polarity to the VIN and GND1 connectors. An electronic or

resistive load must be connected at the output VOUT and GND2 connectors. The tests outlined in this

document are conducted 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.

Once all connections to the LM74700EVM are verified, apply power to VIN. Figure 2 captures EVM board

setup.

Figure 2. LM74700EVM

LM74700QDBVRQ1

GATE 5

CATHODE 4

VCAP

3GND 2

ANODE

U1 SGND

SGND

1 µF

7, 8

5, 6,

1, 2, 3

58 V

2.2 µF

SGND

J3 J4

VIN VOUT

GND1

GND2

220 µF

7, 8

5, 6,

1, 2, 3

0.33 µF

33 V

24 V

58 V

GATE

VIN = 3.9 V to 65 V

5A Max Current

VOUT = 3.9 V to 65 V

5A Max Current

Setup

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2.3 Schematic

Figure 3 illustrates the EVM schematic.

Figure 3. LM74700EVM Schematic

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Operation

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

3 Operation

3.1 Reverse Polarity Protection

A dynamic voltage pulse from 12 V to –12 V is applied at the input of the LM74700EVM. Figure 4 shows

the input voltage (CH1) drops down to –12 V and the output voltage (CH2) does not go negative.

Therefore, the load is protected from dynamic reverse pulses at the input. The LM74700-Q1 reacts to the

negative voltage within 2 μs and it shuts down the MOSFET by pulling the gate (CH3) voltage down. The

output slowly decays due to the large output capacitors and increased time constant.

Figure 4. Reverse Polarity 12 V to –12 V

A –12-V source is connected to the VIN input of the LM74700EVM. Figure 5 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 5. Startup Reverse Polarity (–12 V)

Operation

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3.2 ORing Application

When using the LM74700-Q1 as an ORing device, if the input supplies operate at slightly different

voltages, the voltage at the common load point will follow the higher voltage. The LM74700-Q1 prevents

reverse current flow from the common load point to the lower voltage supply rail. This test uses two

LM74700EVMs with 15 V at the input of the first EVM and 12 V at the input of the second EVM and the

output of both the EVMs are shorted. As Figure 6 shows, the 15-V source at EVM1 is turned off for a

period of time and the output (CH2) drops to 12-V source from EVM2. When the 15-V source is turned on

again, the output rises to 15 V from EVM1. CH1 shows the input to EVM1, CH2 shows the output and

CH3 shows input of EVM2.

Figure 6. ORing Application – Higher Supply Switchover

Next, the 12-V source at EVM2 is turned off for a period of time and turned on again, the output (CH2)

does not change. Figure 7 captures this test.

Figure 7. ORing Application 12-V – Lower Supply Test

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EVM Board Assembly Drawings and Layout Guidelines

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

4 EVM Board Assembly Drawings and Layout Guidelines

4.1 PCB Drawings

Figure 8 through Figure 11 show component placement and layout of this EVM.

Figure 8. LM74700EVM Top Side Placement

EVM Board Assembly Drawings and Layout Guidelines

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Figure 9. LM74700EVM Bottom Side Placement

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EVM Board Assembly Drawings and Layout Guidelines

SNOU153A–October 2017–Revised February 2019

LM74700 Evaluation Module

Figure 10. LM74700EVM Top Layer Routing

EVM Board Assembly Drawings and Layout Guidelines

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LM74700 Evaluation Module

Figure 11. LM74700EVM Bottom Layer Routing

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