Texas Instruments TPS2398EBM Manuale utente

User’s Guide

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User’s Guide

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

DYNAMIC WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 0 Vdc to100 Vdc.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.

If there are questions concerning the input range, please contact a TI field representative prior to connecting

the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible

permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the EVM

output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM

is designed to operate properly with certain components above 50°C as long as the input and output ranges are

maintained. These components include but are not limited to linear regulators, switching transistors, pass

transistors, and current sense resistors. These types of devices can be identified using the EVM schematic

located in the EVM User’s Guide. When placing measurement probes near these devices during operation,

please be aware that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

SLUU172 − October 2003

4Evaluation Modules for −48-V Hot Swap Controllers

Evaluation Modules for −48-V Hot Swap Controllers

Systems Pow

Contents

1 Introduction 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 The −48-V Hot Swap Controller EVM 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Getting Started 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Using the Evaluation Modules to Evaluate the TPS2398 and TPS2399 12. . . . . . . . . . . . . . . . . .

1 Introduction

This User’s Guide describes the use and features of the simple −48-V hot swap evaluation

module (EVM). This EVM can be used to learn about the TPS2398 and TPS2399 hot swap

controller integrated circuits (ICs) from Texas Instruments (TI). The TPS2398 and TPS2399 are

negative voltage hot swap controllers intended for use in systems needing to hot swap telecom

distribution-level voltages. They integrate inrush current control, peak current limiting, electronic

circuit breaker, enable input, and current fault indication. The EVM is a PCB-based tool featuring

either device, and can be used to evaluate device operation in simulated live insertion events.

1.1 Features

The following list highlights some of the features of the TPS2398 and TPS2399.

•Wide input supply range of −36 V to −80 V

•Transient rating to −100 V

•Programmable current limit

•Programmable current slew rate

•Enable input (EN)

•Fault timer to eliminate nuisance trips

•Open-drain power good output (PG)

•8-pin MSOP package

SLUU172 − October 2003

Evaluation Modules for −48-V Hot Swap Controllers

1.2 Description

The TPS2398 and TPS2399 simple −48-V hot swap controllers are integrated solutions

optimized for use in nominal −48-V systems. They are used in conjunction with an external

N-channel MOSFET and sense resistor to enable hot swap, the insertion and removal of plug-in

cards or modules in powered systems. Both devices feature inrush current slew rate and peak

magnitude limiting, which are easily programmed by the sense resistor value, and a single

external capacitor. They facilitate implementation of platform control of the electrical connection

or isolation of the protected load, and provide single-line load fault reporting. An on-chip timer,

also set by a single capacitor, provides filtering against nuisance breaker trips. These features

are all incorporated into a tiny 8-pin MSOP package.

The TPS2398 latches off in response to current faults. The TPS2399 periodically retries the

load, to test for the continued existence of a fault.

2 The −48-V Hot Swap Controller EVM

2.1 Module Description

The −48-V hot swap EVM contains all the components needed to implement a complete telecom

hot swap interface. In addition, it contains some additional components and PCB patterns to

facilitate evaluation of the device.

Banana jacks are provided for connection of the user’s power supply. On the switched side of

the hot swap circuit, jacks are also provided for connection of the user’s electronic or resistive

load, if desired. The board also contains two through-hole patterns for the installation of

large-value aluminum electrolytic capacitors. This capacitance is used to simulate the input bulk

capacitance present at a plug-in’s power inputs. The EVM is supplied from the factory with a

100-µF capacitor installed in one of the locations. The second pattern, connected in parallel with

the first, can be used to increase or otherwise modify the amount of load capacitance.

From the input power jacks, power is applied to the hot swap circuit via a toggle switch

connected in-line with the high-side of the power bus. Bounce of the switch contacts helps the

user observe the response of the devices under power-up conditions resembling those of an

actual application. An on-board slide switch is also provided to independently toggle the status

of the device enable input (EN pin).

With the TPS2398 and TPS2399, both inrush slew rate limiting and a fault time-out period are

externally programmable using capacitors. On the EVM, several options are provided for slew

rate limiting, for quick comparison of the effect of capacitor value on this function. The capacitors

can be quickly switched in and out of the circuit via the DIP switch. Fault timing programming is

set up in a similar manner; some amount of capacitance is hard-wired into the circuit, with the

option of switching in additional capacitance.

Test points are provided throughout the circuit for easy voltage monitoring via oscilloscope or

voltmeter. The test point connections are listed in Table 4.

A pictorial of the −48−V hot swap EVM is shown in Figure 1.

SLUU172 − October 2003

6Evaluation Modules for −48-V Hot Swap Controllers

Figure 1. Evaluation Module Top Assembly

2.2 EVM Schematic Diagram and List of Materials

The EVM schematic diagram is shown in Figure 2.

SLUU172 − October 2003

Evaluation Modules for −48-V Hot Swap Controllers

RTN

GATE

ISNS

−VIN

FLTTME

IRAMP

TP7

TP6

+ +

TP13

TP14

TP15

TP16

VOUT

−

TP4

TP3

USER C1

1000 pF

12345

SW1

TP1

USER

TP2

OFF

ENABLE

TP12TP10

−48 V_IN

TP8

TP11TP9

S1 OFF

−48 V_RTN

TP5

POWER

100 µF

100 V

100 µF

100 V

20 kΩ

1 W

20 mΩ

0.5 W

0.01 µF

0.047 µF

0.1 µF

0.082 µF

7.32 kΩ

1/8 W, 1%

200 kΩ

1/8 W,

12 kΩ

1 W

20 kΩ

1 W

UDG−03018

TPS2398DGK

TPS2399DGK

Power Good

IRF530S

1Not installed on −001 or −002 assemblies.

Figure 2. −48-V Hot Swap Evaluation Module Schematic

SLUU172 − October 2003

8Evaluation Modules for −48-V Hot Swap Controllers

Table 1. List of Materials

REFERENCE

QUANTITY

DESCRIPTION

MANUF

PART NUMBER

REFERENCE

DESIGNATOR −002 −001

DESCRIPTION

MANUF

PART NUMBER

U1 1 − IC, −48-V Hot Swap Controller, w/Retry Texas

Instruments TPS2399DGK

U1 − 1 IC, −48-V Hot Swap Controller, Latching Texas

Instruments TPS2398DGK

TP1−TP4, TP6,

TP7, TP9, TP11,

TP13, TP15 10 10 Jack Test Point, red Farnell 240−345

TP5, TP8, TP10,

TP12, TP14,

TP16 6 6 Jack, test point, black Farnell 240−333

S1 1 1 Switch, toggle, SPDT, PC Mnt. E−Switch 100SP1T1B1M2QE

S2 1 1 Switch, slide, SPDT, right angle, 200 mA E−Switch EG1213

SW1 1 1 Switch, dip, 5-position, SPST CTS 219−05MS

R1 1 1 Resistor, 200 kΩ, 0.125W, 1% Panasonic ERJ−8ENF2003

R2 − − Resistor, 0.125W, 1% Standard Standard

R3 1 1 Resistor, 12 kΩ, 1W, 5% Venkel CR2512−1W123J

R4 1 1 Resistor, 0.02 Ω, 0.5W, 1% Vishay−Dale WSL−2010 .020<1%

R5, R6 2 2 Resistor, 20 kΩ, 1W, 5% Venkel CR2512−1W203J

Q1 1 1 XSTR, MOSFET, N−channel, V(BR) > 100V Int’l Rectifier IRF530S

J1, J2, J3, J4 4 4 Jack, banana, non-insulated, PC mount Pomona 3267

D1 1 1 Diode, LED, green Panasonic LN1361C

C1 1 1 Capacitor, ceramic, 1000 pF, 25 V, 10%, X7R Vitramon VJ0805Y102KXXA

C2 1 1 Capacitor, ceramic, 0.01 µF, 16 V, 10%, X7R Vitramon VJ0805Y103KXJA

C3 1 1 Capacitor, ceramic, 0.047 µF, 16 V, 10%, X7R Vitramon VJ0805Y473KXJA

C4 1 1 Capacitor, ceramic, 0.1 µF, 16 V, 10%, X7R Vitramon VJ0805Y104KXJA

C5 − − Capacitor, ceramic, 0805 Standard Standard

C6 1 1 Capacitor, aluminum. electrolytic, 100 µF, 100 V, 20% Vishay EKA00DE310L00

C7 − − Capacitor, aluminum. electrolytic, 100 µF, 100 V, 20% Vishay EKA00DE310L00

C8 − − Capacitor, ceramic, 1206 Standard Standard

C9 1 1 Capacitor, ceramic, 0.082 µF, 16 V, 10%, X7R Vitramon VJ0805Y823KXJA

N/A 4 4 Spacer, nylon, hex, #6−32, 0.625” Eagle 14HTSP020

N/A 4 4 Screw, nylon, round head, #6−32, 0.25” Eagle 010632R025

N/A 1 1 PCB, FR−4, 2−layer, SMOBC, 3.225” x 2.237”, 0.062”

thk. Texas

Instruments HPA024

SLUU172 − October 2003

Evaluation Modules for −48-V Hot Swap Controllers

2.3 −48-V Hot Swap EVM Operating Specifications

The −48−V hot swap EVM is intended to allow some degree of user reconfiguration. This allows

designers to set up the circuit to better represent the characteristics of their target application.

Potential modifications include changing the current limit threshold, the inrush limiting, the fault

timing, and load characteristics. However, under no circumstances should the EVM kit be

operated beyond the absolute maximum conditions specified in Table 2.

Table 2. Absolute Maximum Ratings (1)(2)

PARAMETER MIN MAX UNITS

Input voltage range, J1 −0.3 100 V

Load current, J3 −2.25

Load return current, J4 2.25 A

Ambient operating temperature range −40 85 °C

(1) All voltages are with respect to the PCB −48-V_IN node at J2.

(2) Currents are positive into and negative out of the specified terminal.

As supplied from the factory, the −48-V hot swap EVM is configured for operation under the

following target conditions, shown in Table 3.

Table 3. Recommended Operating Conditions (1)(2)

PARAMETER MIN TYP MAX UNITS

Input supply voltage, J1 36 48 80 V

Nominal load current, J3 −1

Nominal load return current, J4 1A

Operating temperature range −40 85 °C

(1) All voltages are with respect to the PCB −48-V_IN node at J2.

(2) Currents are positive into and negative out of the specified terminal.

3 Getting Started

3.1 Equipment Requirements

The following test equipment is required to use the −48-V hot swap EVM (TPS2398EVM or

TPS2399EVM).

•Power supply, 80 Vdc at 3-A minimum

•Oscilloscope

•Digital voltmeter (DVM)

The individual DIP switches of SW1 are labeled numerically on the PCB silkscreen. Throughout

this document, references to the DIP switches (e.g., SW1−1) apply to these screened labels, not

to any marking on the switch. However, to determine the ON and OFF positions of the switches,

use the labeling on the switch body itself.

SLUU172 − October 2003

10 Evaluation Modules for −48-V Hot Swap Controllers

3.2 Verifying the EVM Operation

The following procedure steps may be used to verify functional operation of the EVM after

receipt.

3.2.1 Equipment Setup

1. On the EVM board, place the POWER switch in the OFF position, and verify that the

ENABLE switch is in the OFF position.

2. Set the DIP switches 1 through 4 of switch SW1 to the ON position.

3. Turn on the power supply and adjust the output for about 48 V. Verify the supply current

limit is set to allow at least 3 A. Turn off the power supply.

4. Connect the EVM and test equipment as shown in Figure 3.

5. On the oscilloscope, set the channel amplifiers to the following scales:

•CH1: 20 V/div

•CH2: 2 V/div

•CH3: 5 V/div

•CH4: 20 V/div

For easier correlation to the information in this document, the scope trace baselines can be

positioned as shown in Figure 4.

6. Set the scope to trigger on the rising edge of Channel 1, at approximately a 10-V level.

Set the scope timebase to 10 ms, and the trigger mode to NORMAL.

UDG−03019

OSCILLOSCOPE

CH 1

CH 2

CH 3

CH 4

POWER

SUPPLY

−+

J2 (−48V_IN)

J1 (−48V_RTN)

TP2

TP4

TP3

TP16

TP15

TP14

TP8/TP12 (GND)

VOLTS COM

DIGITAL

VOLTMETER

−48-V Hot Swap Controller

Evaluation Module

(TPS2398EVM/TPS2399EVM)

Figure 3. Evaluation Module Setup

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