Texas Instruments TPS2553Q1EVM User manual

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
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User's Guide
SLVUAT7–October 2016
TPS2553Q1EVM (HVL125A) Precision Current Limiting
Switch User Guide
The Texas Instruments TPS2553Q1EVM evaluation module (EVM) helps designers evaluate the operation
and performance of the TPS2553-Q1. This user’s guide describes the TPS2553Q1EVM evaluation module
(EVM). This guide contains the EVM schematic, bill of materials (BoM), assembly drawing, and top and
bottom board layouts.
Contents
1 Introduction ................................................................................................................... 2
2 Schematic, Bill of Materials, and Layout ................................................................................. 3
3 Setup and Operation ....................................................................................................... 9
List of Figures
1 TPS2553Q1EVM Board .................................................................................................... 2
2 TPS2553Q1EVM Schematic............................................................................................... 3
3 EVM Board Image for TPS2553Q1EVM (Top View).................................................................... 5
4 EVM Board Image for TPS2553Q1EVM (Bottom View)................................................................ 5
5 Layout—Top Composite.................................................................................................... 6
6 Top Overlay .................................................................................................................. 6
7 Layout—Bottom Composite ................................................................................................ 7
8 Top Layer..................................................................................................................... 7
9 Bottom Layer................................................................................................................. 8
10 Test Setup for Turnon and Turnoff Delay............................................................................... 11
11 Turnon Delay ............................................................................................................... 11
12 Turnoff Delay ............................................................................................................... 11
13 Test Setup for Short-Circuit Output Current-Limit...................................................................... 13
14 5-Ohm Load to Short-Circuit Transient.................................................................................. 13
15 Short-Circuit to 5-Ohm Load Transient.................................................................................. 13
16 Test Setup for Auto-Retry Functionality................................................................................. 15
17 Test Setup for Auto-Retry Functionality................................................................................. 15
18 Test Setup for Auto-Retry Functionality With J3 ....................................................................... 15
List of Tables
1 BOM .......................................................................................................................... 3
2 Test Point Descriptions ..................................................................................................... 9
3 Manual Enable or Auto-Retry Jumpers................................................................................... 9
4 Current Limiting Jumpers ................................................................................................. 10
5 EVM Electrical Characteristics............................................................................................ 10

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
1 Introduction
The TPS2553Q1EVM is an evaluation module (EVM) for an automotive power-distribution switch with
adjustable current-limiting outputs provided by Texas Instruments. The EVM has an operating voltage
range of around 2.5 V to 6.5 V, and has four different output current limits, based on jumper placement on
the board. The output current limits range from 100 mA to 1500 mA. There is also onboard functionality for
manual setting of the enable pin or using a jumper solution for using the auto-retry feature of the device.
The provided test points give the user access to multiple ground points and all critical node voltages.
The PCB top-side accepts a power distribution switch in a SOT23-6 package. This switch has an enable
input, a fault output for overcurrent or reverse voltage conditions, and overtemperature shutdown.
Figure 1. TPS2553Q1EVM Board
1.1 Related Documentation
•TPS2553-Q1 Precision Adjustable Current-Limited Power-Distribution Switches datasheet, SLVSBD0
1.2 TPS2553-Q1 Applications
• Automotive ECU Supply Rail Power Distribution and Switching
• Precision Current Limiting
• USB Ports and Hubs

J3 J4 J5
GND
GND
0.1 µF
C4
0.1 µF
C2
GNDGND
J6
100k
R6 IN
1
GND 2 EN
3
FAULT
4ILIM 5
OUT 6
U1
TPS2553QDBVRQ1
GND
0.1 µF
C5
10 µF
C1
J2
J1
GND
TP2
TP5
TP6
TP4
16.2k
R2
7.68k
R3
23.2k
R4
182k
R5
TP1
TP3
TP8
TP7
TP9
TP10
100k
R1 120 µF
C3
VIN = 2.5 V – 6.5 V
VIN(Max) = 7 V
VOUT = 7 V
IOUT(Max) = 1.7 A
VIN
GND GND
GND GND
FAULT
EN
VOUT
ILIM
1
3
2
S1
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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
2 Schematic, Bill of Materials, and Layout
This section provides a detailed description of the TPS2553Q1EVM schematic, bill of materials (BOM), and layout.
2.1 Schematic
Figure 2. TPS2553Q1EVM Schematic
2.2 Bill of Materials
Table 1. BOM
DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER
!PCB1 1 Printed Circuit Board MSA016 Any
C1 1 10uF CAP, CERM, 10 µF, 10 V, ± 20%, X6S,
AEC-Q200 Grade 2, 0603 0603 GRT188C81A106ME13D MuRata
C2, C4, C5 3 0.1uF CAP, CERM, 0.1 µF, 50 V, ± 10%, X7R,
AEC-Q200 Grade 1, 0603 0603 CGA3E2X7R1H104K080AA TDK
C3 1 120uF CAP, TA, 120 µF, 20 V, ± 20%, 0.085
ohm, SMD Case Code R 594D127X0020R2T Vishay-Sprague
J1, J2, J3, J4, J5, J6 6 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector
Solutions
R1, R6 2 100k RES, 100 k, 1%, 0.1 W, 0603 0603 CRCW0603100KFKEA Vishay-Dale
R2 1 16.2k RES, 16.2 k, 1%, 0.1 W, 0603 0603 CRCW060316K2FKEA Vishay-Dale

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
Table 1. BOM (continued)
DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER
R3 1 7.68k RES, 7.68 k, 1%, 0.1 W, 0603 0603 CRCW06037K68FKEA Vishay-Dale
R4 1 23.2k RES, 23.2 k, 1%, 0.1 W, 0603 0603 CRCW060323K2FKEA Vishay-Dale
R5 1 182k RES, 182 k, 1%, 0.1 W, 0603 0603 CRCW0603182KFKEA Vishay-Dale
S1 1 Switch, Slide, SPDT, On-Off-On, 3 Pos,
0.05A, 48 V, TH 9.5x5mm AS1E-2M-10-Z Copal Electronics
SH-J1, SH-J2, SH-J3 3 1x2 Shunt, 100mil, Flash Gold, Black Closed Top 100mil Shunt SPC02SYAN Sullins Connector
Solutions
TP1, TP3, TP7, TP8, TP9,
TP10 6 Test Point, Miniature, SMT Testpoint_Keystone_ Miniature 5015 Keystone
TP2, TP4, TP5, TP6 4 PCB Pin, Swage Mount, TH PCB Pin(2505-2) 2505-2-00-44-00-00-07-0 Mill-Max
U1 1 PRECISION ADJUSTABLE CURRENT- LIMITED POWER-DISTRIBUTION
SWITCHES, DBV0006A DBV0006A TPS2553QDBVRQ1 Texas Instruments
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or
mount. Fiducial N/A N/A

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
2.3 Layout and Component Placement
Figure 3 and Figure 4 top and bottom overviews of the printed circuit board (PCB) show the component
placement of the EVM.
Figure 3. EVM Board Image for TPS2553Q1EVM (Top View)
Figure 4. EVM Board Image for TPS2553Q1EVM (Bottom View)

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
Figure 5. Layout—Top Composite
Figure 6. Top Overlay

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
Figure 7. Layout—Bottom Composite
Figure 8. Top Layer

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
Figure 9. Bottom Layer

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TPS2553Q1EVM (HVL125A) Precision Current Limiting Switch User Guide
3 Setup and Operation
This section describes the connectors, jumpers, and test points on the EVM as well as how to connect, set
up, and properly use the EVM. An example of the EVM operation is also included.
3.1 Connectors
There are several types of Input/Output (I/O) connections on the EVM including:
• Input/Output Turret Connections: For both positive and negative (GND) input and output supplies,
banana-plug compatible
• Test Points: For the fault, enable, input, output, and ground connected pins
• Two-Pin Jumpers: For the feedback Rlim on the Ilim pin used for current limiting. In this way, four
adjustable current limits are available via jumper
• Two-Pin Jumpers: For manual enable, or auto-retry functionality
Table 2 lists the test points and functional descriptions.
Table 2. Test Point Descriptions
TEST POINT
NUMBER
TEST POINT
SILKSCREEN
LABEL FUNCTION DESCRIPTION
TP1 VIN Voltage Monitoring and Probing Input voltage monitoring
TP2 VIN Voltage Input Input voltage connection
TP3 VOUT Voltage Monitoring and Probing Output voltage monitoring
TP4 GND GND Input ground connection
TP5 VOUT Voltage Output Output voltage connection
TP6 GND GND Output ground connection
TP7 EN Voltage Monitoring and Probing Enable signal voltage monitoring
TP8 GND Voltage Monitoring and Probing Ground connection point
TP9 GND Voltage Monitoring and Probing Ground connection point
TP10 FAULT Voltage Monitoring and Probing Fault signal voltage monitoring
3.2 Jumper Settings and Configuration
The jumpers onboard the TPS2553Q1EVM may be put into two functional categories. The first set of
jumpers may either manually set the enable signal to a logic high or low, or utilize the auto-retry
functionality of the device. See the TPS2553-Q1 datasheet for additional information. The auto-retry time
is dependant on the RC delay given by R6 and C5 on the EVM. Either J6 or J1 and J2 should be active to
exercise these two modes of operation. Table 3 includes jumper settings for auto-retry mode along with
the wait time in between tries.
Table 3. Manual Enable or Auto-Retry Jumpers
DEVICE MODE JUMPERS AUTO RETRY TIME (ms)
Auto-Retry J1 AND J2 10
Manual Enable J6
A more detailed overview of the current limiting options on the EVM is given in Table 4. The EVM is
designed with feedback resistance such that the minimum current limit satisfies the listed applications and
current values in the table. The actual output current values may be slightly higher. To achieve current
limits in Table 4, use only one jumper at a time on jumpers J3, J4, and J5.

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Table 4. Current Limiting Jumpers
POWER REQUIREMENT JUMPER IOSmin (mA) RILIM (kΩ)
1 Low-Power USB device Remove all jumpers 100 229.08
1 High-Power USB device J5 500 47.08
2 High-Power USB devices J4 1000 23.88
3 High-Power USB devices J3 1500 16.2
Table 5 includes abridged EVM electrical characteristics. For a full functional description of the TPS 2553-
Q1 device, refer to the TPS2553-Q1 datasheet.
Table 5. EVM Electrical Characteristics
PARAMETER CONDITION MIN TYP MAX UNIT
Input Voltage, VIN TP2 2.5 6.5 V
Output Current, IOUT TP5 1.7 A
Continuous FAULT Sink Current J1 AND J2, or J6 10 mA
3.3 EVM Setup
The EVM setup section details what test equipment the user needs to use the EVM and how to properly
setup the EVM environment.
3.3.1 Recommended Test Equipment
The following is the recommended test equipment:
• Two-channel storage oscilloscope
• Current probe
• Voltage probe
• Adjustable DC-power supply with at least 2.5-V to 6.5-V output and a 10-A current limit
• Digital Multimeter or Volt-Ohm meter
• Passive or active load capable of handling up to 3 A
3.4 Basic Operation
3.4.1 Measuring Turnon and Turnoff Delays and Rise and Fall Times
Users should read the TPS2553-Q1 Datasheet before using the EVM. Figure 10 shows the recommended
test setup for measuring the delay and rise and fall times. In Figure 10, the jumpers shown on the EVM
diagram are the ones that must be connected to ensure correct operation. Test points for voltage probing
are also highlighted in the figure. It is recommended to use at least a 5-W power resistor in this setup,
because of the high current output.