Texas Instruments TPS25831-Q1 User manual

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TPS25831-Q1 Evaluation Module
User's Guide
SLVUBL1A–November 2018–Revised February 2019
TPS25831-Q1 Evaluation Module
This user's guide describes the TPS25831-Q1 evaluation module (TPS25831Q1EVM-062). This document
contains the EVM schematics, EVM configuration, bill of materials (BOM), board layout drawing, and
assembly drawing.
Contents
1 Introduction ................................................................................................................... 2
2 Test Setup .................................................................................................................... 2
3 Board Layout ................................................................................................................. 5
4 Schematic and Bill of Materials........................................................................................... 11
List of Figures
1 EVM Setup For Testing Buck Converter ................................................................................. 2
2 EVM Setup for Charging USB Type-C™ Device ....................................................................... 3
3 Top Side Assembly.......................................................................................................... 5
4 Bottom Side Assembly...................................................................................................... 6
5 Top Layer Layout............................................................................................................ 7
6 Middle Layer 1 Layout ...................................................................................................... 8
7 Middle Layer 2 Layout ...................................................................................................... 9
8 Bottom Layer Layout....................................................................................................... 10
9 TPS25831Q1EVM-062 Schematic....................................................................................... 11
List of Tables
1 Connectors ................................................................................................................... 3
2 Jumpers....................................................................................................................... 3
3 LED............................................................................................................................ 3
4 Test Points.................................................................................................................... 4
5 Bill of Materials ............................................................................................................. 12
Trademarks
USB Type-C is a trademark of USB Implementers Forum.

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1 Introduction
The TPS25831Q1EVM-062 is an evaluation module (EVM) for TI's TPS25831-Q1 USB Type-C™ and
BC1.2 5-V, 3.5-A output, 36-V input synchronous buck with cable compensation. The EVM operates over
a range from 6 V to 36 V and provides USB Type-C connectors to evaluate BC1.2 and USB Type-C
charging and USB2.0 data communication functions. The value of cable compensation, current limit, and
switching frequency can be adjusted by resistors on the EVM.
1.1 Features
The following features are available on this EVM:
• 6-V to 36-V input range, 3.5-A continuous output current buck converter
• Forced PWM operation with spread-spectrum dithering
• Fully AEC-Q100 qualified
• ± 8% Current sense accuracy (IOUT > 1.5 A) for precision cable droop compensation
• USB battery charging specification Rev. 1.2 and USB Type-C Rev. 1.3 compliant
• CC1, CC2, D+ and D– Short-to-VBAT, and VBUS protection
• User-programmable VBUS current limit and internal VCONN current limiting
• External NTC component for thermal management
1.2 Applications
The EVM is used in the following applications:
• Automotive: Infotainment, USB hubs, aftermarket USB chargers
2 Test Setup
Figure 1 shows a typical test setup for testing the TPS25831Q1EVM-062 buck converter. Connect J2 to
the 13.5-V power supply. Connect the load to the J1 connector. Install a shunt on J4 to apply Rd on CC1.
Figure 1. EVM Setup For Testing Buck Converter

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Figure 2 shows a typical test setup for charging the USB Type-C device. Connect J2 to the 13.5-V power
supply. Connect USB Type-C device to J7 connector. Shunts do not need to be installed on J4 or J5.
Figure 2. EVM Setup for Charging USB Type-C™ Device
2.1 Physical Access
Table 1 lists the TPS25831Q1EVM-062 connector functionality, Table 2 describes the jumper
configuration, Table 3 shows LED labels and description, and Table 4 describes the test point availability.
Table 1. Connectors
Connector Component Type Description
J2 Terminal block Power input connector for TPS25831-Q1. Connect to a 6-V to 36-V power supply.
J1 Terminal block The regulated output voltage of the TPS25831-Q1 buck converter.
J3 USB Type-A connector, plug Upstream facing USB 2.0 Type A connector. Connect to the USB 2.0 host for data
pass through to J7. The power pin of this connector is float.
J7 USB Type-C connector,
receptacle Downstream facing USB Type-C connector. Connect to the USB Type-C slave for data pass through from J3 and BC1.2 or USB Type-C identification. USB output
power is provided to the slave from the buck converter of the TPS25831-Q1
device.
Table 2. Jumpers
Jumper Label Description
J4 CC1 3 × 1 header. Install shunt to connect Ra or Rd on CC1. Remove shunt to float CC1.
J5 CC2 3 × 1 header. Install shunt to connect Ra or Rd on CC2. Remove shunt to float CC2.
J6 CTRL1 Install shunt to select CTRL1 as LOW. Remove shunt to select CTRL1 as HIGH.
CTRL2 Install shunt to select CTRL2 as LOW. Remove shunt to select CTRL2 as HIGH.
Table 3. LED
LED Label Description
D4 THERM_WARN THERM_WARN signal LED. Turn on when thermal warning asserts.
D5 LD_DET LD_DET signal LED. Turn on when LD_DET asserts.
D6 POL POL signal LED. Turn on when POL asserts.
D7 FAULT FAULT signal LED. Turn on when FAULT asserts.

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Table 4. Test Points
Test Point Label Description
TP1 VCONN VCC pin test point via R1 or external Vconn input
TP2 CSP Test point of voltage between inductor and sense resistor.
TP3 CSN/OUT CSN pin test point and DC-DC output test point
TP4 VIN VIN pin test point
TP5 EN EN pin test point or external EN input.
TP6,TP7, TP8, TP9 GND Power ground test point
TP10 THERM_WARN Thermal warning pin test point
TP11 CC1 CC1 pin test point
TP12 CC2 CC2 pin test point
TP13 LD LD_DET pin test point
TP14 POL POL pin test point
TP15 FLT FAULT pin test point
TP16 VBUS USB Type-A and USB Type-C connector, VBUS test point
TP17 RT RT pin test point or external clock input.
2.2 Adjusting the Switching Frequency
If other frequencies are desired, within the frequency range of 400 kHz to 2.2 MHz, the Rtresistor (R11)
value can be changed. Consult the data sheet for proper selection of the Rtresistor (R11). Change the
inductor (L1) and the total output capacitance for proper control loop operation.
The RT/SYNC pin can also be used to synchronize the internal oscillator to an external clock. The
TPS25831EVMQ1-062 allows users to synchronize the internal oscillator to both Lo-Z clock source and
Hi-Z clock source by configuring R11, R12, and C13. Refer to the data sheet for detailed information.
2.3 Adjusting the Current Limit Value
If other current limit values are desired, the Rlresistor (R15) value can be changed. Consult the data
sheet for proper selection of the Rlresistor (R15).
2.4 Adjusting the Cable Compensation Value
If other cable compensation values are desired, the Rmresistor (R16) value can be changed. Consult the
data sheet for proper selection of the Rmresistor (R16).
2.5 Adjusting Thermal Management
If other thermal management desired, the RT1 resistor, R14, R18 and R19 value can be changed. Consult
the data sheet for proper selection .

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3 Board Layout
Figure 3 and Figure 4 show the top and bottom assembly. Figure 5 to Figure 8 show the layout of the
EVM.
Figure 3. Top Side Assembly

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Figure 4. Bottom Side Assembly

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Figure 5. Top Layer Layout

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Figure 6. Middle Layer 1 Layout

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Figure 7. Middle Layer 2 Layout

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Figure 8. Bottom Layer Layout