Texas Instruments TPS25940XEVM-635 User Manual

User's Guide

SLVUA44–June 2014

TPS25940XEVM-635: Evaluation Module for TPS25940X

This user’s guide describes the evaluation module (EVM) for the Texas instruments TPS25940X devices.
TPS25940X devices are eFuse with true reverse blocking for power mux that operates from 2.7 V to 18 V,
the device has integrated back-to-back FETs with programmable undervoltage, overvoltage, reverse­voltage, overcurrent and in-rush current protection features.

Contents

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

1.1 EVM Features....................................................................................................... 2

1.2 EVM Applications ................................................................................................... 2

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

3 Schematic..................................................................................................................... 3

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

4.1 Physical Access..................................................................................................... 4

4.2 Test Equipment ..................................................................................................... 5

4.3 Test Setup ........................................................................................................... 6

4.4 Test Procedures .................................................................................................... 7

5 EVM Assembly Drawings and Layout Guidelines...................................................................... 12

6 Bill of Materials (BOM)..................................................................................................... 14

List of Figures

1 TPS25940XEVM Schematic ............................................................................................... 3

2 EVM Test Setup.............................................................................................................. 6

3 V
4 V

5 J4 = LO Current Limit Test Auto Retry (CH1) .......................................................................... 11

6 J9 = “No Jumper” Current Limit Test with Latch (CH2) ............................................................... 11

7 Top Side Placement ....................................................................................................... 12

8 Top Side Routing Layer ................................................................................................... 12

9 Bottom Side Routing Layer ............................................................................................... 13

1 TPS25940X EVM Options and Default Setting .......................................................................... 2

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

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

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

5 EVM Configuration Setting ................................................................................................. 5

6 Operational Range Setting for VIN1, VIN2 = 12 V, 5 V and 3.3 V .................................................... 7

7 PWR635 DMM Readings at Different Test Points....................................................................... 7

8 PWR635 Oscilloscope Setting for Ramp Up Voltage Test............................................................. 8

9 PWR635 Oscilloscope Settings for Current Limit Test................................................................ 10

10 PWR635 Jumper Setting for Current Limits ............................................................................ 10

11 TPS25940XEVM-635 Bill of Material ................................................................................... 14

Ramp Up Time for CH1 ............................................................................................... 9

OUT

Ramp Up Time for CH2 ............................................................................................... 9

OUT

List of Tables

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Introduction

1 Introduction

The TPS25940XEVM allows reference circuit evaluation of TI's TPS25940X devices. The TPS25940X
devices are available with both latched and auto-retry operation.

1.1 EVM Features

• 2.7-V to 18.0-V (TYP) operation

– CH1 rising input voltage turn-on threshold – 10.5 V (TYP)
– CH1 falling input voltage turn-off threshold – 9.7 V (TYP)
– CH2 rising input voltage turn-on threshold – 2.3 V (TYP)
– CH2 falling input voltage turn-off threshold – 2.1 V (TYP)

• 0.6-A to 5.0-A programmable current limit

• Programmable undervoltage lockout, overvoltage

• Programmable V

• Latched-off TPS25940LRUV (CH2)

• Auto-Retry TPS25940ARUV (CH1)

• Pushbutton RESET signal

• On-board transorb for overvoltage input protection

• Schottky diode at output to minimize negative spike when load is removed

1.2 EVM Applications

• Solid state drives and hard disk drives

• PCIe, RAID, and NIC cards

• USB power switch

• Industrial

– PLCs
– Solid-state relays and FAN control

slew rate

OUT

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2 Description

The TPS25940XEVM-635 enables full evaluation of the TPS25940X devices. The EVM supports two
versions (Auto-retry and Latched) of the devices on two Channels (CH1 and CH2, respectively). Input
power is applied at J3 (CH1) and J8 (CH2), while J2 (CH1)/J7 (CH2) provide the output connection to the
load, refer to the schematic in Figure 1, and test setup in Figure 2.

D5/C1 (CH1), D9/C7 (CH2) provides input protection for TPS25940X (U1 and U2, respectively) while
D4/C2/C3/C4 (CH1), D8/C8/C9/C10 (CH2) provides output protection.

Table 1. TPS25940X EVM Options and Default Setting

Part Number EVM Function VINRange UVLO OVP Current Limit Fault Response

TPS25940XEVM-635 Current Limiter with DEVSLP 2.7 V–18 V 10.5 V 2.3 V (internal) 16.5 V 3.6 A 2.1 A 5.3 A Auto-retry Latched

S1 allows U1 and S2 allows U2 to be RESET or disabled. A power good (PG) indicator is provided by D3,
D6 for CH1 and CH2, respectively, and circuit faults can be observed with D2 and D6. Scaled channel
current can be monitored at TP11 and TP22 with a scale factor of 0.842 V/A.

2

TPS25940XEVM-635: Evaluation Module for TPS25940X SLVUA44–June 2014

CH1 CH2 LO setting No Jumper HI Setting CH1 CH2

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1nf

C12

475k

R20

SH-J9

1

2

3

J9

16.9k

R25

TP26

ILIM LO

ILIM HI

TP17
EN_UV2

TP18

OVP2

TP15
VIN2

TP16
VOUT2

Red

D6

Green

D7

10.0k

R5

TP10

P-LOAD-RTN

TP6

P-LOAD

330pF

C11

VIN2

TP7

I-LOAD

VOUT2

VOUT1

4

7,8

1,2,3

5,6,

30V

Q1
CSD17301Q5A

Pin1_CTRL-2

TP22

IMON2

FLTb-2

P-LOAD

2

1

S2

1nf

C6

475k

R4

SH-J4

1

2

3

J4

TP14

ILIM LO

ILIM HI

TP3
VIN1

TP2
VOUT1

Red

D2

Green

D3

330pF

C5

VIN1

VOUT1

Pin1_CTRL-1

TP11
IMON

FLTb-1

2

1

S1

0.1µF

C1

TP4
FLTb1

TP20
FLTb2

TP21
PG2

1 2
3 4

J5

VOUT1 VOUT2

SH-J5

TP12

TP25

TP24

TP13

VIN=2.7V-18V

IIN=0.6A-5.0A

VIN=2.7V-18V

IIN=0.6A-5.0A

VOUT=2.7V-18V

IOUT=0.6A-5.0A

VOUT=2.7V-18V

IOUT=0.6A-5.0A

1

2

3

Q3

1
2
3

J10

10k

R29

VIN2

100k

R24

SH-J10

Pin1_CTRL-2

1

2

3

Q2

10k

R21

VIN1

100k

R15

SH-J6

Pin1_CTRL-1

PG-1

PG-2

PG-1

PG-1

PG-2

TP1
SYS_PG

TP19

TP23

FLTb-1 Pin1_CTRL-2

VIN1

22k

R8

DNP

OVP-2

OVP-2

SH-J1

24.9k

R12

24.9k

R27

100k

R1

100k

R2

100k

R16

100k

R17

20V

D8
B320A-13-F

20V

D4
B320A-13-F

330µF

C10

16V

D9

16V

D5

4.7µFC24.7µF

C3

4.7µFC84.7µF

C9

DEVSLP

1

PGOOD

2

PGTH

3

OUT

4

OUT

5

OUT

6

OUT

7

OUT

8

IN

9

IN

10

IN

11

IN

12

IN

13

EN/UVLO

14

OVP

15

GND

16

ILIM

17

DVDT

18

IMON

19

FLTB

20

PAD

U1

TPS25940ARVC

DEVSLP

1

PGOOD

2

PGTH

3

OUT

4

OUT

5

OUT

6

OUT

7

OUT

8

IN

9

IN

10

IN

11

IN

12

IN

13

EN/UVLO

14

OVP

15

GND

16

ILIM

17

DVDT

18

IMON

19

FLTB

20

PAD

U2

TPS25940LRVC

0.1

R6

1

2

J3

1

2

J8

1
2

J2

1
2

J7

TP9
PG1

0.003

R7

DNP

TP5

OVP1
TP8
EN_UV1

475k

R3

475k

R18

475k

R19

16.9k

R9

32.4k

R13

48.7k

R22

DNP

32.4k

R26

47k

R11

47k

R23

EN/UVLO-1

OVP-1

DVDT-1

IMON-1

ILIM-1

PGTH-1

DVDT-2

IMON-2

ILIM-2

PGTH-2

EN/UVLO-2

1
2
3

J6

123

J1

SGND1

SGND2

Net-Tie

Net-Tie

Net-Tie

Net-Tie

Net-Tie

IMON-1

330µF

C4

16.9k

R10

16.2k

R14

16.2k

R28

Net-Tie

1µF

C7

1

3

2

D1
BAT54C-7-F

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Schematic

3 Schematic

Figure 1 shows the EVM schematic.

Figure 1. TPS25940XEVM Schematic

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General Configurations

4 General Configurations

The following sections describe physical access, test equipment, test setup, and test procedures for the
EVM.

4.1 Physical Access

Table 2 lists the TPS25940XEVM-635 input and output connector functionality. Table 3 describes the test

point availability and Table 4 describes the jumper functionality.

Connector Label Description

J3 CH1 VIN1(+), GND(–) CH1 Input power supply to the EVM
J2 VOUT1(+),GND(–) CH1 Output power from the EVM
J8 CH2 VIN2(+), GND(–) CH2 Input power supply to the EVM
J7 VOUT2(+),GND(–) CH2 Output power from the EVM

Channe Test Points Label Description
l

CH1 TP3 VIN1 CH1 Input power supply to the EVM

TP8 EN_UV1 CH1 Active high enable and under voltage input
TP5 OVP1 CH1, Active high overvoltage input (>16.5V)
TP11 IMON1 CH1 Current monitor. Load current = 1.187 × voltage on TP11
TP2 VOUT1 CH1 Output from the EVM
TP9 PG1 CH1 Power good test point
TP4 FLTb1 CH1, Fault test point
TP12 GND GND
TP13 GND GND
TP14 GND GND

CH2 TP15 VIN2 CH2 Input power supply to the EVM

TP17 EN_UV2 CH2 Active high enable and under voltage input
TP18 OVP2 CH2, Active high overvoltage input
TP22 IMON2 CH2 Current monitor. Load current = 1.187 × voltage on TP22
TP16 VOUT2 CH2 Output from the EVM
TP21 PG2 CH2 Power good test point
TP20 FLTb2 CH2, Fault test point
TP24 GND GND
TP25 GND GND
TP26 GND GND

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Table 2. Input and Output Connector Functionality

Table 3. Test Points Description

Jumper Label Description

J1 J1 Priority Mux Setting (applicable to TPS25942XEVM-635)
J4 LO - HI CH2 Current Setting
J5 J5 PG1 and FLTb1 setting
J6 J6 DEVSLP1 Setting
J9 LO - HI CH2 Current Setting
J10 J10 DEVSLP2 Setting
D2 (Red) D2 CH1 circuit fault indicator. LED turns on when the internal MOSFET is disabled due to

4

TPS25940XEVM-635: Evaluation Module for TPS25940X SLVUA44–June 2014

Table 4. Jumper and LED Descriptions

a fault condition such as over load , short circuit, under voltage etc.

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Use Table 5 to set the EVM in different configurations in order to achieve the desired functionality from the
TPS25940XEVM-635.

General Configurations

Table 4. Jumper and LED Descriptions (continued)

Jumper Label Description

D3 (Green) D3 CH1 Power good indicator. LED turns on when the voltage at TP2(VOUT1) is more

than 11 V

D6 (Red) D6 CH2 circuit fault indicator. LED turns on when the internal MOSFET is disabled due to

a fault condition such as over load , short circuit, under voltage etc.

D7(Green) D9 CH2 Power good indicator. LED turns on when the voltage at TP2(VOUT1) is more

than 11 V

Table 5. EVM Configuration Setting

Jumper Location E-fuse with DevSleep

J4 1-2 Install jumper at this location for 5.3 A

current Limit for VIN1

2-3 Install jumper at this location for 3.6 A

current Limit for VIN1

OPEN If no jumper is installed default current

limit is 2.1 A for VIN1

J9 1-2 Install jumper at this location for 5.3 A

current Limit for VIN2

2-3 Install jumper at this location for 3.6 A

current Limit for VIN2

OPEN If no jumper is installed default current

limit is 2.1 A for VIN2

J5 1-2 OPEN

3-4

J1 1-2 Install Jumper to get PG1 from VOUT1

2-3 OPEN

J6 1-2 OPEN

2-3

J10 1-2 OPEN

2-3

4.2 Test Equipment

This section describes the power supply, meter, oscilloscope, and loads for testing this EVM.

4.2.1 Power Supplies

One adjustable power supply: 0-V to 20-V output, 0-A to 6-A output current limit.

4.2.2 Meters

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

4.2.3 Oscilloscope

A DPO2024 or Lecroy 424 oscilloscope or equivalent, three 10X voltage probes, and a DC current probe.

4.2.4 Loads

One resistive load or equivalent which take up to 6 ADC load at 12 V and capable to do the output short.

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+ -

J2

J7

R7

D9

Positive

Load

Negative

J3

Negative

Power

Supply

Positive

Negative

Power

Supply

Positive

J8

D5

TP

12

TP

13

TP

24

TP

25

U1

U2

DUT

PWR635

Positive

Load

Negative

Voltmeter

PRINT
HELP

ALPHA

SHIFT

ENTER

RUN

DGERF

I

AJBKC

L

7M8N9

O

DGDGD

G

D

G T3U

0V.WX

Y

Z

TAB

% UTILIZATION

HUB/MAU NIC

2

BNC
4Mb/s

Voltmeter

PRINT
HELP

ALPHA

SHIFT

ENTER

RUN

DGERF

I

AJBKC

L

7M8N9

O

DGDGD

G

D

G T3U

0V.WX

Y

Z

TAB

% UTILIZATION

HUB/MAU NIC

2

BNC
4Mb/s

Oscilloscope

Texas

Instruments

S1

S2

D3

D2

D7

D6

General Configurations

4.3 Test Setup

Figure 2 shows a typical test setup for the TPS25940XEVM. Connect J3/J8 to the power supply and J2/J7

to the load.

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Figure 2. EVM Test Setup

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