Texas Instruments TPS2398EBM User manual

User’s Guide
1
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User’s Guide

2
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
Copyright 2002, Texas Instruments Incorporated

3
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
Copyright 2002, Texas Instruments Incorporated

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4Evaluation Modules for −48-V Hot Swap Controllers
Evaluation Modules for −48-V Hot Swap Controllers
Systems Pow
er
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

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5
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.

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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.

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7
Evaluation Modules for −48-V Hot Swap Controllers
1 2 3 4
8 7 6 5
RTN
GATE
ISNS
−VIN
EN FLTTME IRAMP
TP7
TP6
Q1
+ +
TP13
TP14
TP15
TP16
J3 J4
VOUT
+
VOUT
−
TP4
TP3
1
C5 USER C1
1000 pF
12345
SW1
TP1
D1
C8 USER
1
TP2
OFF
ON
ENABLE
TP12TP10
J2
−48 V_IN
TP8
S2
TP11TP9
S1 OFF
ON
J1
−48 V_RTN
TP5
POWER
1
C6 100 µF 100 V
C7 100 µF 100 V
R5 20 kΩ 1 W
R4 20 mΩ 0.5 W
C2 0.01 µF
C3 0.047 µF
C4 0.1 µF
C9 0.082 µF
R2 7.32 kΩ 1/8 W, 1%
R1 200 kΩ 1/8 W, 1%
R3 12 kΩ 1 W
R6 20 kΩ 1 W
UDG−03018
1
U1
TPS2398DGK TPS2399DGK
PG
Power Good
IRF530S
1Not installed on −001 or −002 assemblies.
Figure 2. −48-V Hot Swap Evaluation Module Schematic

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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

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9
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
A
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
A
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.

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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