Texas Instruments TPS23525EVM-815 User manual

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

User's Guide

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

This user’s guide describes the TPS23525 evaluation module (TPS23525EVM-815). TPS23525EVM-815

contains evaluation and reference circuitry for the TPS23525, which is a low-side hot swap and dual

ORing controller targeted at telecom applications.

Contents

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

1.1 Features.............................................................................................................. 1

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

1.3 Electrical Specifications............................................................................................ 2

2 Schematic .................................................................................................................... 3

3 General Configuration and Description .................................................................................. 4

3.1 Physical Access .................................................................................................... 4

3.2 Equipment Setup ................................................................................................... 5

3.3 Scope Considerations ............................................................................................. 5

4 Test Results ................................................................................................................. 5

5 Bill of Material .............................................................................................................. 13

List of Tables

1 TPS23525 Electrical and Performance Specifications at 25°C........................................................ 2

2 Connector Functionality .................................................................................................... 4

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

4 Jumper Descriptions......................................................................................................... 4

5 TPS23525EVM-815 Bill of Materials..................................................................................... 13

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

The TPS23525 EVM provides a jump-start to anyone designing a redundant feed –48-V system. The EVM

includes input clamping to support lightning surge (up to 2 kV), various FET placeholders to support

various power levels, and an output inductor to mimic any EMI filter before the DC/DC converter.

Additionally, the EVM includes circuitry that supports auxiliary bulk capacitors. This “auxiliary bulk

capacitor” approach is useful when designing for large hold-up times (example: 10 ms) making the hot-

swap design more manageable by reducing the initial charge on the capacitor.

1.1 Features

This EVM has the following features:

• Inrush current control

• Hot-swap output short-circuit protection

• Reverse current protection

• Dual supply ORing

• Reverse hookup protection

Introduction

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1.2 Applications

This EVM is used in the following applications:

• Wireless infrastructure

• Telecom infrastructure

• –48-V interface

1.3 Electrical Specifications

Table 1 lists the TPS23525 electrical and performance specifications at 25°C.

Table 1. TPS23525 Electrical and Performance Specifications at 25°C

Characteristic TPS23525EVM-PWR815

Input voltage Range (Recommended) 38 V to 60 V

Input Voltage Range (Abs Max) 0 V to 150 V

Load Power 400 W

Load Output Cap 660 µF

Current Limit (Normal) 12.5 A

Current Limit (High FET VDS) 1.5 A

Typical Inrush Current 0.4 A

Hot-swap FET VDS when current transitions from high to low 20.2 V

Time Out (VDS,HS < 10 V) 2.25 ms

Time Out (10 V < VDS,HS < 20 V) 1.12 ms

Time Out (VDS,HS > 20 V) 0.23 ms

Undervoltage Threshold (Rising) 36.6 V

Undervoltage Threshold (Falling) 34.6 V

Overvoltage Threshold (Rising) 64.4 V

Overvoltage Threshold (Falling) 61.4 V

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Schematic

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

2 Schematic

Figure 1 illustrates the EVM schematic.

Figure 1. TPS23525EVM-815 Schematic

General Configuration and Description

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3 General Configuration and Description

3.1 Physical Access

Table 2 lists the TPS23525EVM connector and functionality, Table 3 describes the test point availability,

and Table 4 describes the default jumper configuration.

Table 2. Connector Functionality

Connector Label Description

J1, J2, J3 RTN Power bus input - Tie the high-side of power-supply inputs and outputs here

J7 Neg48V_B Power bus input - Tie the low-side of power-supply B input here

J8 Vout_FLTD Output bus - Apply the low-side load here (if applicable)

J9 CAUX Connect to auxiliary bulk capacitor (if applicable)

J10 Neg48V_A Power bus input - Tie the low-side of power-supply A input here

Table 3. Test Points

Connector Label Description

TP1 RTN High-side power-supply input and high-side output load voltage

TP2 VCC Clamped voltage supply

TP3 PGB Power Good Bar

TP4 SS Soft-start pin voltage

TP5 UVEN UV pin voltage

TP6 D D pin voltage

TP7 OV OV pin voltage

TP8 GATE Gate drive output voltage for hot-swap FET

TP9 SNS Sense pin test point

TP10 TMR Timer capacitor voltage

TP11 GATEB Gate drive output voltage for Gate B ORing FET

TP12 GATEA Gate drive output voltage for Gate A ORing FET

TP13, TP15 VEE IC ground - Place voltage probe ground at this pin

TP14 Neg48VB Low-side input for power-supply B

TP16 HS_DRAIN Drain voltage of the hot-swap FET

TP17 VOUT_FLTD Low-side output for load

TP18 Neg48VA Low-side input for power-supply A

TP19 - Open-drain output for power good signal. Attach to downstream EN pin.

Table 4. Jumper Descriptions

Connector Description

J5 Jump pins 1-2 to enable UV (default), or jump pins 2-3 to tie UV to VCC (disable)

J6 Leave open to enable OV (default), or jump pins 1-2 to tie OV to GND (disable)

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General Configuration and Description

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

3.2 Equipment Setup

Use the following equipment list and setup steps to work with the EVM:

• 2× power supplies capable of ≥60 V and ≥15 A (preferred)

• Resistive or electronic load – only turn on the load after the hot swap is up

• Set the input power-supply voltage to the desired operating input voltage

• Turn the power supply off

• Jump pins 1-2 on J5

• Leave pins 1-2 on J6 open

• Connect the positive voltage lead from the power-supply A to J1 (RTN). Connect the ground lead from

the power-supply A to J10 (Neg48V_A).

• Connect the positive voltage lead from the power-supply B to J3 (RTN). Connect the ground lead from

the power-supply B to J7 (Neg48V_B).

• Make sure all voltmeter or oscilloscope GNDs are tied to VEE

• Turn the power supplies on

3.3 Scope Considerations

Observe the following scope considerations:

• Most scopes have a 10-MΩresistance between scope GND and probe.

• If scope GND is tied to RTN and a probe is placed on TMR, that creates approximately 5 μA of pullup

current which can overpower the pull down of the TMR pin and result in an undesired time out.

4 Test Results

This section provides typical performance waveforms for the TPS23525EVM-815 board. Actual

performance data is affected by measurement techniques and environmental variables; therefore, these

curves are presented for reference and may differ from actual results obtained. All curves are based on

VIN = 48 V, unless stated otherwise.

No Load, Scope GND = –48V_A

Figure 2. Start Up (VIN = 54 V)

No Load, Scope GND = –48V_A

Figure 3. Start Up (VIN = 54 V)

Test Results

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No Load, Scope GND = –48V_A

Figure 4. Start Up (VIN = 38 V)

No Load, Scope GND = –48V_A

Figure 5. Start Up (VIN = 60 V)

VINA = 54 V, VINB = 54 V, No Load, Scope GND = RTN

Figure 6. Hot Plug Channel A and B Together

VINA = 54.5 V, VINB = 54 V, No Load, Scope GND = RTN

Figure 7. Hot Plug Channel A and B Together

VINA = 54 V; VINB = 38 V, Scope GND = RTN, Iload = 5 A

Figure 8. Hot Plug A After B

VINA = 54 V; VINB = 38 V, Scope GND = RTN, Iload = 5 A

Figure 9. Hot Plug A After B

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Test Results

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

VINA = 54 V; VINB = 38 V, Scope GND = RTN, Iload = 5 A

Figure 10. Hot Plug A After B

VINA = 54.5 V; VINB = 54 V, Scope GND = RTN, No Load

Figure 11. Hot Plug A After B

Scope GND = –48V_B, No Load, After Inductor

Figure 12. Output Hot Short (VINB = 54 V)

Scope GND = –48V_B, 5-A Load, After Inductor

Figure 13. Output Hot Short (VINB = 54 V)

Scope GND = –48V_B, 5A Load, Zoomed in

Figure 14. Output Hot Short (VINB = 54 V)

Scope GND = –48V_B, 5-A Load

Figure 15. Output Hot Short (VINB = 60 V)

Test Results

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Scope GND = –48V_B, 5-A Load, Zoomed In

Figure 16. Output Hot Short (VINB = 60 V)

Scope GND = –48V_A

Figure 17. Gradual Overcurrent (VINA = 54 V)

Scope GND = –48V_A

Figure 18. Load Step Overcurrent

Scope Gnd = –48V_A, VIN = 54 V

Figure 19. Start Into Short

Scope Gnd = –48V_A, VIN = 54 V

Figure 20. Start Into Short

Scope Gnd = –48V_A, VIN = 54 V

Figure 21. Apply Short and Remove Short

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Test Results

SLVUB36–October 2017

TPS23525EVM-815 Evaluation Module

Scope GND = –48V_A, Iload = 5 A

Figure 22. 1-ms Brown Out

Scope GND = –48V_A, Iload = 5 A

Figure 23. 1-ms Brown Out

VINB = 53 V, Iload = 5 A, Scope GND = RTN

Figure 24. Supply Switch Over (Raise VINA)

VINB = 53 V (Raise VINA), Scope GND = RTN, Iload = 5 A

Figure 25. Supply Switch Over (Zoomed in)

VINA = 54.5 V; VINB = 54 V, Iload = 5 A, Scope GND = RTN

Figure 26. VINA Short

VINA = 54.5 V; VINB = 54 V, Iload = 5 A, Scope GND = RTN

Figure 27. VINA Short

Test Results

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VINA = 54.5 V; VINB = 54 V, Iload = 5 A, Scope GND = RTN

Figure 28. Unplug VIN A

VINB = 60 V

Figure 29. Plug in VIN A Backwards

VINB Floating

Figure 30. Plug in VIN A Backwards

Scope GND = –48V_A, No Load

Figure 31. Undervoltage and Overvoltage (Rising)

Scope GND = –48V_A, No Load

Figure 32. Undervoltage and Overvoltage (Falling)

Scope GND = RTN, 5-A Load, Per IEC61000-4-5

Figure 33. –2-kV (2 Ω) Lightning Surge

Table of contents

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