Texas Instruments TPS281C100 Manual de usuario

EVM User's Guide: TPS281C100EVM

TPS281C100 Evaluation Module

Description

The TPS281C100EVM is a hardware evaluation

module (EVM) used to enable hardware engineers

to evaluate the full performance and functionality of

the TPS281C100 industrial high side switch. The

TPS281C100EVM contains everything needed to test

and assess the TPS281C100 before designing into

part of a greater application's power system. The

evaluation module is designed to either be used as a

standalone board with an attached voltage supply and

output load or in conjunction with an underlying Texas

Instruments microcontroller by using the standardized

BoosterPack™ plug-in module headers. A wide range

of application features such as digital output module,

safe torque off (STO), and holding brake are enabled

and visible through use of this evaluation module.

This EVM is populated with the QFN version of

TPS281C100.

Features

• Configurable current limit with fixed resistors

• Configurable current sense with fixed resistor

• BoosterPack plug-in module headers allowing

power switch to be controlled by external

microcontroller

• On-board 3.3-V LDO allowing for control signals to

be manipulated by a set of jumpers

• Good board layout and copper area for thermal

performance

• Jumper at the output to support different clamp

configurations for inductive discharge

• Optional footprint to populate TVS diode for VDS

clamp for faster inductive discharge

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TPS281C100 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

The Texas Instruments TPS281C100EVM is an evaluation module that is used to demonstrate and showcase

all of the features of the underlying TPS281C100 industrial high side switch. This evaluation board provides

a seamless way to connect a set of power supplies to the inputs of the TPS281C100, connect loads to the

output channels, and switch on and off the device using the control pins of the chip itself. An on-board 3.3-V

LDO is included on the EVM to simplify controlling signals to the TPS281C100 and easily assert and deassert

logic signals by the use of a set of external hardware jumpers. Additionally, this EVM includes BoosterPack

plug-in module headers allowing the user to easily connect the TPS281C100 high side switch to an underlying

microcontroller and write software to control and configure the device.

1.2 Kit Contents

Table 1-1 lists the contents of the EVM kit. Contact the Texas Instruments Product Information Center nearest if

any component is missing.

Table 1-1. Kit Contents

Item Quantity

TPS281C100EVM 1

1.3 Specification

The TPS281C100EVM is compatible with both the TPS281C100A and TPS281C100B device versions. Table

1-2 shows the comparison across different device versions. Please note the TPS281C100EVM supports both

versions, but has TPS281C100A populated. To evaluate the TPS281C100B, the TPS281C100A (U2) device has

to be removed and the TPS281C100B device soldered down. Please refer to the device data sheet for more

detailed specifications.

Table 1-2. Device Comparison

DEVICE VERSION PART NUMBER CURRENT LIMIT RANGE INTEGRATED CLAMP

FOR INDUCTIVE LOADS

INRUSH CURRENT

PERIOD

A TPS281C100A 1 A to 5 A (fixed 0.5A with

ILIM short to GND) Yes Yes

B TPS281C100B 1 A to 5 A (fixed 0.5A with

ILIM short to GND) Yes No

1.4 Device Information

The TPS281C100 is a single channel smart high-side switch designed to meet the requirements of industrial

control systems. The low RON(100 mΩ) minimizes device power dissipation, driving a wide range of output load

current up to 4.5-A DC and the 60-V DC operation range improves system robustness.

The TPS281C100 device integrates protection features such as thermal shut down, output clamp, and current

limit. These features improve system robustness during fault events such as short circuit. TPS281C100

implements an adjustable current limiting circuit that improves the reliability of the system by reducing inrush

current when driving large capacitive loads and minimizing overload current. To drive high inrush current loads

such as lamps or fast charging capacitive loads, TPS281C100 implements an inrush current time period with a

higher level of allowed current.

The device also provides an accurate load current sense that allows for improved load diagnostics such as

overload and open-load detection enabling better predictive maintenance.

Table 1-3. Device Information

Part Number Package Body Size (nom)

TPS281C100A QFN (12) 4 mm × 4 mm

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2 Hardware

2.1 BoosterPack™ Plug-in Module Operation

While the TPS281C100EVM can be used as a standalone evaluation board without the need of any external

microcontroller, the EVM also comes populated with BoosterPack plug-in module headers (J15, J16) to enable

easy interface with a Texas Instruments microcontroller. Additionally, by populating jumper J14 the user has

the ability to power the underlying LaunchPad™ development kit through the integrated 3.3-V LDO on the

TPS281C100EVM. A list of pins connected to the BoosterPack plug-in module header can be seen below in

Table 2-1:

Table 2-1. Connected BoosterPack Plug-in Module Header Pins on TPS281C100EVM

BoosterPack Plug-in

Module Pin Function Note

1 3.3-V power rail Disconnect J14 if powering LaunchPad development kit

through USB.

5 FLT pin used to detect faults Open drain input. Pullup source can be controlled using

jumper J12.

6 Current sense output from IC Current sense resistor is R12

38 Configure DIAG_EN Make sure J7 is not populated if using microcontroller output.

39 Configure EN_IC Make sure J6 is not populated if using microcontroller output.

40 Configure OL_IC Make sure J8 is not populated if using microcontroller output.

Note that for all IO and analog signals being attached to the BoosterPack plug-in module, the relevant 10-kΩ

protection resistors are populated in series with the pin for reverse current protection.

To power the attached LaunchPad development kit from the on-board LDO of the TPS281C100EVM, connect

the jumper J14. Note that this feeds the output of the 3.3-V LDO on the TPS281C100EVM into the 3.3-V rail on

the LaunchPad development kit . If there is another power supply trying to power the LaunchPad development

kit (such as the integrated USB power on the LaunchPad development kit itself), this can potentially cause

issues with the separate power sources fighting for contention.

Jumpers J6 through J8 are used to manually configure the control signals going into the TPS281C100.

When using a microcontroller to control these signals, these jumpers must be unpopulated to allow for the

microcontroller to drive them high or low.

For correct and accurate current sense, the maximum voltage out on the SNS pin is clamped to VSNSFH

internally, so there is no need for external clamp.

2.2 Connection Descriptions

Table 2-2 shows the test points populated on the board as well as the signal connectors.

Table 2-2. Connections and Test Points

Connector and Test Point Description

J1, TP1 Supply voltage VS

J3, TP2 Output voltage VOUT

J2, J4, TP7-TP10 System GND

TP3 ENABLE test point

TP4 DIAG_EN test point

TP5 ILIM test point

TP6 OL_ON test point

TP11 GND_IC test point

TP12 FAULT test point

TP13 SNS_IC test point

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TPS281C100 Evaluation Module 3

Table 2-3 shows the relevant configuration jumpers of the TPS281C100EVM as well as the associated values.

Please refer to the TPS281C100 data sheet for detailed information on each pin's functionality.

Please note that a white mark on the jumper silkscreen is reflecting the position 1 of the jumper.

Table 2-3. Jumper Configurations

Jumper Function, Settings

J5 Connect 1 and 2 to disable on-board LDO; connect 2 and 3 to enable on-board LDO.

J6 Connect 1 and 2 to pull ENABLE high using the on-board LDO; connect 2 and 3 to pull ENABLE low.

J7 Connect 1 and 2 to pull DIAG_EN high; connect 2 and 3 to pull DIAG_EN low.

J8 Connect 1 and 2 to pull OL_ON high; connect 2 and 3 to pull OL_ON low.

J9 Connect to keep output at 0 V during inductive turn-off; disconnect for TVS clamp to clamp the output

(default to –10 V) during inductive turn-off.

J10 Connect the 24.9 kΩ resistor to ILIM pin. Resistor is paralleled if J11 is also connected.

J11 Connect the 16.9 kΩ resistor to ILIM pin. Resistor is paralleled if J10 is also connected.

J12 Connect 1 and 2 to use LDO for FAULT pullup; connect 2 and 3 to use BoosterPack plug-in module 3.3 V

for FAULT pullup.

J13 Connect to bypass GND network. Disconnect to use GND network.

J14 Connect to power the BoosterPack plug-in module with LDO.

2.3 Best Practices

CAUTION

Hot surface. Contact can cause burns. Do not touch!

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3 Hardware Design Files

3.1 Schematic

Figure 3-1. TPS281C100EVM Schematic Drawing

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TPS281C100 Evaluation Module 5

3.2 PCB Layouts

Figure 3-2. 3D Representation

Figure 3-3. Top Layer

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Figure 3-4. Ground Layer

Figure 3-5. Power Layer

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Figure 3-6. Bottom Layer

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3.3 Bill of Materials

The table below lists the TPS281C100 Bill of Materials.

Table 3-1. TPS281C100 Bill of Materials

Designator Description Part Number Manufacturer

C1 CAP, CERM, 1 uF, 100 V, +/- 10%, X7S, AEC-Q200 Grade 1, 0805 CGA4J3X7S2A105K125AB TDK

C2 CAP, CERM, 2.2 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0805 CGA4J3X7R1H225K125AB TDK

C3 10 µF ±10% 100 V Ceramic Capacitor X6S 1206 (3216 Metric) C3216X6S2A106K160AC TDK

C4 CAP, CERM, 4700 pF, 100 V, +/- 5%, C0G/NP0, 0603 C0603C472J1GAC7867 Kemet

C5 CAP, CERM, 0.022 uF, 100 V, +/- 10%, X7R, 0603 C1608X7R2A223K080AA TDK

C8 CAP, CERM, 1000 pF, 50 V, +/- 5%, X7R, AEC-Q200 Grade 1, 0603 C0603C102J5RACAUTO Kemet

C9 CAP, CERM, 0.1 uF, 100 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0805 CGA4J2X7R2A104K125AA TDK

D1, D6 Diode, Switching, 200 V, 0.2 A, SOT-23 BAS21-7-F Diodes Inc.

D4 Diode, TVS, Bi, 60 V, 96.8 Vc, SMC (no polarity) SMCJ60CA-HRA Littelfuse

D5 Diode, TVS, Uni, 10 V, SMC SMCJ10A Bourns

J1, J3 BANANA JACK, SOLDER LUG, RED, TH SPC15363 Tenma

J2, J4 BANANA JACK, SOLDER LUG, BLACK, TH SPC15354 Tenma

J5, J6, J7, J8, J12 Header, 2.54mm, 3x1, Gold, TH 961103-6804-AR 3M

J9, J10, J11, J13, J14 Header, 2.54mm, 2x1, TH 961102-6404-AR 3M

J15, J16 Receptacle, 2.54mm, 10x2, Tin, TH SSQ-110-03-T-D Samtec

R1, R2, R3, R10, R11 RES, 10 k, 5%, 0.1 W, 0603 RC0603JR-0710KL Yageo

R5 RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW06030000Z0EA Vishay-Dale

R6 RES, 24.9 k, 0.5%, 0.1 W, 0805 RR1220P-2492-D-M Susumu Co Ltd

R7 RES, 16.9 k, 0.5%, 0.1 W, 0805 RR1220P-1692-D-M Susumu Co Ltd

R8, R9 RES, 1.0 k, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 RCA06031K00JNEA Vishay-Dale

R12 RES, 1.00 k, 1%, 0.25 W, 0805 ERJ-P06F1001V Panasonic

SH-J1, SH-J2, SH-J3, SH-J4,

SH-J5, SH-J6, SH-J7, SH-J8 Shunt, 100mil, Gold plated, Black SNT-100-BK-G Samtec

TP1, TP2 Test Point, Multipurpose, Red, TH 5010 Keystone

TP3, TP4, TP5, TP6, TP12,

TP13 Test Point, Multipurpose, Green, TH 5126 Keystone

TP7, TP8, TP9, TP10, TP11 Test Point, Multipurpose, Black, TH 5011 Keystone

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TPS281C100 Evaluation Module 9

Table 3-1. TPS281C100 Bill of Materials (continued)

Designator Description Part Number Manufacturer

Single Output LDO, 100 mA, Fixed 3.3 V Output, 3 to 60 V Input,

with Enable and Power Good, 8-pin MSOP (DGN), -40 to 125 degC,

Green (RoHS & no Sb/Br)

TPS7A1633DGNR Texas Instruments

U2 60-V, 100-mΩ, Single-Channel Smart High-Side Switch TPS281C100DNTR Texas Instruments

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