Texas Instruments TPS26624 Manuel utilisateur

SLVUBA5–October 2017

TPS26624-25 Evaluation Module

ADVANCE INFORMATION

User's Guide

SLVUBA5–October 2017

TPS26624-25 Evaluation Module

This user’s guide describes the evaluation module (EVM) for the Texas Instruments TPS26624 and

TPS26625 devices. This document provides configuration information and test setup details for evaluating

the TPS26624-25 devices. The EVM schematic, board layout, and bill of materials (BOM) are included.

Contents

1 Introduction ................................................................................................................... 1

2 Description.................................................................................................................... 2

3 Schematics ................................................................................................................... 3

4 General Configurations ..................................................................................................... 4

5 EVM Board Assembly Drawings and Layout Guidelines ............................................................... 9

6 Bill Of Materials (BOM).................................................................................................... 11

List of Figures

1 TPS26624-25EVM Schematic ............................................................................................. 3

2 EVM Setup With Test Equipment.......................................................................................... 5

3 J4 = 1-2 Position, Current Limit (800 mA) and Auto-Retry............................................................. 7

4 Output Short-Circuit Protection ............................................................................................ 8

5 TPS26624-25EVM Top Side Placement ................................................................................. 9

6 TPS26624-25EVM Bottom Side Placement.............................................................................. 9

7 TPS26624-25EVM Top Layer Routing.................................................................................. 10

8 TPS26624-25EVM Bottom Layer Routing .............................................................................. 10

List of Tables

1 TPS26624-25EVM Options and Setting.................................................................................. 2

2 Input and Output Connector Functionality................................................................................ 4

3 Test Points Description ..................................................................................................... 4

4 Jumper and LED Descriptions ............................................................................................. 4

5 TPS26624-25EVM Oscilloscope Setting for Current Limit Test....................................................... 6

6 TPS26624-25EVM Jumper Setting for Current Limits.................................................................. 6

7 TPS26624-25EVM Oscilloscope Setting for Output Short Circuit Protection........................................ 7

8 TPS26624-25EVM Bill of Materials...................................................................................... 11

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

The TPS26624-25EVM allows reference circuit evaluation of TI's TPS2662X. The TPS2662X devices

(TPS26624 and TPS26625) are 4.5- to 57-V, 800-mA industrial eFuse with integrated back-to-back FETs,

programmable undervoltage, overvoltage, input reverse polarity, output reverse polarity, overcurrent and

inrush current protection features.

Introduction

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1.1 Features

The TPS26624-25EVM features include:

• 4.5- to 57-V input operating voltage range

• 25- to 800-mA programmable current limit

• Reverse input polarity and reverse output polarity protection up to –57 V

• Programmable input undervoltage lockout (UVLO) and overvoltage protection (OVP) cutoff

• Programmable VOUT slew rate control

• Overcurrent fault response (auto-retry and latch versions available)

• Optional onboard transient protection like input TVS and output Schottky diodes

• Onboard reset switch

1.2 EVM Applications

The TPS26624-25EVM is used in the following applications:

• Control and automation

• Industrial power systems

• Sensors controls

• PLCs

2 Description

The TPS26624-25EVM enables full evaluation of the TPS26624-25 devices. This EVM has two

independent channels (CH1 and CH2) where two devices can be evaluated together. CH1 is configured to

test TPS26624 – latch-off variant and CH2 is configured to test TPS26625 – auto-retry variant. Input

power is applied at T1 (CH1) and T3 (CH2) while T2 (CH1) and T4 (CH2) provide the output connections

to the load. Refer to the schematic in Figure 1 and EVM test setup in Figure 2. S1 and S2 allow U1 and

U2 to be reset or disabled and jumper J4 and J8 allow the current limit setting to be changed.

Table 1. TPS26624-25EVM Options and Setting

Part Number EVM Function Vin Range UVLO OVP Current Limit Fault Response

Versions Available

TPS26624-25EVM 4.5-V to 57-V,

800-mA Industrial eFuse 4.5 V–57 V 15 V 33 V 25 mA 800 mA Auto-retry and Latch-off

TP1

FLTb1

VIN1

49.9k

Green

24.3k

VIN1=4.5V to 57V

IIN1=0.025A-0.88A

34.0k

TP5

GND

TP3

VIN1

TP4

VOUT1

TP2

SHDNb1

TP6

GND

TP7

GND

VOUT1=4.5V-57V

IOUT1=0.025A-0.88A

Vout1

Vout1Vin1

Vin1

51V

DNP 1µF

10µF

0.022µF

29.4k

887k

TP8

FLTb2

49.9k

R11

Green

D12

24.3k

R14

VIN2=4.5V to 57V

IIN2=0.025A-0.88A

34.0k

R15

GND

TP12

GND

TP10

VIN2

TP11

VOUT2

TP9

SHDNb2

TP13

GND

TP14

GND

VOUT2=4.5V-57V

IOUT2=0.025A-0.88A

Vout2

Vout2Vin2

Vin2

51V

DNP 1µF

10µF

C10

0.022µF

29.4k

R13

887k

R12

UVLO

OVP

SHDN 4

RTN 5

GND 6

ILIM 7

DVDT

FLT 9

OUT 10

PAD 11

TPS26624DRCR

UVLO

OVP

SHDN 4

RTN 5

GND 6

ILIM 7

DVDT

FLT 9

OUT 10

PAD 11

TPS26625DRCR

GNDGND

267k

R10

26.7k

13.3k

7.50k

44.2k

DNP

GNDGND

267k

R20

26.7k

R18

13.3k

R17

7.50k

R16

44.2k

R19

DNP

33V

D10

2.2µF

Red

D11

VOUT1

VIN2

VOUT2

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Schematics

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3 Schematics

Figure 1 illustrates the EVM schematic.

Figure 1. TPS26624-25EVM Schematic

General Configurations

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4 General Configurations

4.1 Physical Access

Table 2 lists the TPS26624-25EVM input and output connector functionality, Table 3 describes the test

point availability, and Table 4 describes the jumper functionality.

Table 2. Input and Output Connector Functionality

Connector Label Description

T1 CH1 VIN1(+), GND(–) CH1 input power supply to the EVM

T2 VOUT1(+), GND(–) CH1 output from the EVM

T1 CH2 VIN2(+), GND(–) CH2 input power supply to the EVM

T2 VOUT2(+), GND(–) CH2 output from the EVM

Table 3. Test Points Description

Test Points Label Description

TP1, TP8 FLTb1, FLTb2 Fault indicator

TP2, TP9 SHDNb1, SHDNb2 Shutdown signal

TP3, TP10 VIN1, VIN2 Power supply input

TP4, TP11 VOUT1, VOUT2 eFuse output

TP5, TP12 GND GNDTP6, TP13

TP7, TP14

Table 4. Jumper and LED Descriptions

Jumper Label Description

J1, J5 J1, J5 FLTb pullup to VIN1,VIN2

J2, J6 J2, J6 Output power indicator for VOUT1, VOUT2

J3, J7 J3, J6 Connects bulk capacitor to VOUT1, VOUT2

J4, J8 ILIM

1-2 position sets 880 mA

3-4 position sets 500 mA

5-6 position sets 250 mA

7-8 position sets 150 mA

9-10 position sets 25 mA

4.2 Test Equipment and Set Up

4.2.1 Power Supplies

One adjustable power supply 0-V to 60-V output, 0-A to 5-A output current limit.

4.2.2 Meters

One multimeter minimum needed and may require more if simultaneous measurements are needed.

4.2.3 Oscilloscope

A DPO2024 or equivalent, three 10× voltage probes and a DC current probe.

4.2.4 Loads

One resistive load or equivalent which can tolerate up to 2-A DC load at 24 V.

Power

Supply

Load

Power

Supply Load

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General Configurations

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NOTE: A resistive load is recommended for testing. If an electronic load is used, ensure that it is set

in the constant resistance (CR) mode, not in the constant current (CC) mode.

4.3 Test Setup and Connections

Figure 2 shows a typical test setup for the TPS26624-25 EVM. Connect T1 to the power supply and T2 to

the load.

Figure 2. EVM Setup With Test Equipment

General Configurations

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4.4 Test Procedure

4.4.1 Current Limit Test

Use the following instructions to verify the current limit and the latch feature.

1. Table 5 shows how to setup the oscilloscope for CH1.

Table 5. TPS26624-25EVM Oscilloscope Setting for Current Limit Test

Oscilloscope Setting CH1 Probe Points CH2 Probe Points

Channel 1 = 20 V/div VIN1 (TP3) VIN2 (TP10)

Channel 2 = 20 V/div VOUT1 (TP4) VOUT2 (TP11)

Channel 3 = 50 V/div FLTb1 (TP1) FLTb2 (TP8)

Channel 4 = 500 mA/div Input current into T1 + wire Input current into T3 + wire

Trigger source = Channel 4

Trigger level = 500 mA ±100 mA

Trigger polarity = Positive

Trigger mode = Single sequence

Time base 800 ms/div 800 ms/div

NOTE: If an electronic load is used, ensure that the output load is set to constant resistance mode

and not constant current mode.

NOTE: Measuring Current Limit values on the oscilloscope can easily cause 8% error from

anticipated values listed in Table 5.

2. The jumper setting for the different current limit test is shown in Table 6.

3. Set the current limit to 880 mA by installing the J4 and J8 jumper in position 1-2.

Table 6. TPS26624-25EVM Jumper Setting for Current

Limits

CH1, CH2 Jumper Position

(J4, J8) Load Current Limit

1-2 880 mA

3-4 500 mA

5-6 250 mA

7-8 150 mA

9-10 25 mA

4. Set the power supply on CH1 to 24 V and the output load on CH2 to 120 ±1 Ωand enable the power

supply and load on CH1.

5. Set the trigger on the oscilloscope and change the load to 24 ±1 Ω.

6. Verify that input current is limited as per the setting in Table 6 and the device is in latched mode as

shown in Figure 3.

7. The level of the current pulse should match with the load current limit setting in Table 6.

8. After the oscilloscope triggers, turn off the load.

9. Connect the oscilloscope to CH2 and verify the same behavior on CH2 by repeating the procedure.

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General Configurations

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Figure 3. J4 = 1-2 Position, Current Limit (800 mA) and Auto-Retry

4.4.2 Output Short-Circuit Protection Test

Follow the instructions to verify the output short-circuit protection feature of the device.

1. Set the oscilloscope as shown in Table 7 on CH1.

Table 7. TPS26624-25EVM Oscilloscope Setting for Output Short Circuit

Protection

Oscilloscope Setting CH1 Probe Points CH2 Probe Points

Channel 1 = 20 V/div VIN1 (TP3) VIN2 (TP10)

Channel 2 = 20 V/div VOUT1 (TP4) VOUT2 (TP11)

Channel 3 = 20 V/div FLTb1 (TP1) FLTb2 (TP8)

Channel 4 = 2 mA/div Input current into T1 + wire Input current into T3 + wire

Trigger source = Channel 2

Trigger level = 10 V

Trigger polarity = Negative

Trigger mode = Single sequence

Time base 2 ms/div 2 ms/div

General Configurations

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2. Set the power supply on CH1 to 24 V and the load resistance on CH1 to 120 ±1 Ω.

3. Enable the load and the power supply on CH1.

4. Use either thick wire or a screw driver to short the output to ground and verify the output short-circuit

response as shown in Figure 4.

Figure 4. Output Short-Circuit Protection

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EVM Board Assembly Drawings and Layout Guidelines

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5 EVM Board Assembly Drawings and Layout Guidelines

5.1 PCB Drawings

Figure 5 through Figure 8 show the component placement and layout of this EVM.

Figure 5. TPS26624-25EVM Top Side Placement

Figure 6. TPS26624-25EVM Bottom Side Placement

EVM Board Assembly Drawings and Layout Guidelines

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Figure 7. TPS26624-25EVM Top Layer Routing

Figure 8. TPS26624-25EVM Bottom Layer Routing

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