Texas Instruments DRV8334 Manuale utente

EVM User's Guide: DRV8334EVM

DRV8334 Evaluation Module

Description

The DRV8334EVM is a 30 A, 3-phase brushless DC

drive stage based on the DRV8334 gate driver for

BLDC motors.

The EVM allows quick evaluation of the DRV8334

device which spins a BLDC motor with trapezoidal

commutation and control.

Status LEDs for all power supplies as well as a

Fault LED are included for user feedback. The C2000

launchpad (LAUNCHXL-F280049C) is required for

this kit and is used to control the DRV8334 as well

as monitor and report faults.

Features

• 4.5V to 60 V operation with support for 12 V/24 V

applications

• 100% duty cycle PWM control, with 1 A/2 A peak

gate drive

• 40+ configurable IDRIVE steps for fine slew rate

tuning

• 3x integrated CSAs with low input offset drift

Applications

•Appliances, cordless garden and power tools,

lawnmowers

•Brushless-DC (BLDC) motor modules and PMSM

•Fans, pumps, and servo drives

• E-bikes, e-scooters, and e-mobility

•Cordless vacuum cleaners

•Drones, industrial and logistics robots, and RC

toys

DRV8334EVM

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DRV8334 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

This document is provided with the DRV8334 customer evaluation module (EVM) as a supplement to the

DRV8334 data sheet. The user's guide details the hardware implementation of the EVM.

This document is designed to be used as a startup guide to the DRV8334EVM and LAUNCHXL-F280049C

device. This document is intended for the engineers involved in the design, implementation, and validation of

DRV8334 + TMS320F280049C reference software.

The scope of this document is to provide the user with a guide to evaluate the DRV8334 device with a

TMS320F280049C board. This document covers the hardware connections required between boards and

external motor/supplies. When the hardware connections are complete, the user can access the necessary

tools and software to spin a motor using the online GUI.

The reference software is composed of GuiComposer software with sensored trapezoidal algorithm for BLDC

motor control.

Figure 1-1. DRV8334EVM

CAUTION

The DRV8334EVM is designed to be evaluated only with the LAUNCHXL-F280049C MCU PCB,

which must be ordered separately.

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WARNING

Voltages exceeding the standard EVM ratings as specified on the data sheet can cause personal

injury, electrical shock hazard, damage the EVM, or a combination.

Additionally, do not leave power connections to the EVM connected while not in operation.

WARNING

Hot surface Contact can cause burns. Do not touch.

WARNING

High Voltage

For safety, use of isolated test equipment with overvoltage and

overcurrent protection is highly recommended.

Electric shock is possible when connecting board to live wire. The

board must be handled with care by a professional.

1.2 Kit Contents

Item Description Quantity

DRV8334EVM PCB 1

Box Cardboard box 1

Label Standard label 1

Foam Antistatic foam 2

Literature EVM disclaimers 1

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DRV8334 Evaluation Module 3

1.3 Specification

SOB

INHB GHC

SOA

INLB SHC

GND

INHC BSTC

CPL

INLC BSTB

CPH

SDO SHB

GVDD

SDI GHB

PVDD

SCLK GLB

CPTL

nSCS SLB

CPTH

nSLEEP SLA

VCP

nFAULT GLA

VDRAIN

VREF GHA

BSTA

SOC SHA

Not to scale

DRV8334

48-pin

PWR_PAD (0) - GND

GHA

SHA

GLA

SLA

RSENSE

VMOTOR

CBST

RGS RGS

GHB

SHB

GLB

SLB

RSENSE

CBST

BSTB

RGS RGS

GHC

SHC

GLC

SLC

RSENSE

CBST

RGS RGS

CBULK

VDRAIN

SPC

SNC

SPB

SNB

SPA

SNA

RnFAULT

VCCIO

VCCA

CVREF

RSO

CSO

SOC

SOx

SOB

SOA

BSTA

SNC

SNB

SPB

SNA

SPA

SLC

GLC

SHC

GHC

BSTB

BSTC

GHB

SHB

SLB

GLB

GLA

SLA

SHA

GHA

RBST

BSTA

RBST

BSTC

RBST

CVDRAIN

RSP

RSN

CSPSN

RSP

RSN

CSPSN

RSP

RSN

CSPSN

CSP

CSN

CSP

CSN

CSP

CSN

INLA

INHA

AGND

DRVOFF

SNC

SPC

SNB

SPB

SNA

SPA

SLC

GLC

CCP_FLY

CGVDD

CPVDD

CCPT_FLY

VBAT

RPVDD

GND

VDRAIN

CVCP

GND

Gate of

external

switches

VCP

Figure 1-2. 3-phase BLDC Driver Simplified Schematic

1.4 Device Information

The DRV8334 enables customers to evaluate their motor performance within their gate driver system. The

DRV8334 implements features such as enhanced Smart Gate Drive and expanded device protection features,

making the device an excellent choice for applications such as power tools, appliances, pumps, and fans. The

device supports both 12 V and 24 V applications while allowing up to 65 V PVDD abs max to support power

supply transients.

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2 Hardware

2.1 Hardware Connections Overview – DRV8334EVM + LAUNCHXL-F280049C

The following section describes the EVM hardware and connections to the external supply, hall sensors, PC via

USB, and motor.

Figure 2-1. EVM Board Overview

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DRV8334 Evaluation Module 5

Connect the DRV8334EVM board to the

LAUNCHXL-F280049C Launchpad top

posi



on (J1/J2/J3/J4). The DRV8334EVM

sits on Top of the launchpad.

Figure 2-2. DRV8334EVM Mating to LAUNCHXL-F280049C

The DRV8334EVM must plug into the LAUNCHXL-F280049C Launchpad headers closest to the USB port as

shown above.

Figure 2-3. VMOTOR Input (J10)

WARNING

To minimize the risk of potential shock hazard and personal injury, remove all power connections and

interfaces to the DRV8334EVM when not in use.

The DRV8334EVM is designed for an input supply from 4.5 VDC to 60 VDC and up to 30-A continuous drive

current (in-line fuse limited). The input connects to J10 with the noted polarity. VMOTOR test point connects to

the same node but must not be used for high current input. VMOTOR input is fused with a 30 A fuse and the

input connector is rated for 32 A.

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Figure 2-4. Hall Sensor Input and Power Connections (J11)

Hall sensors are connected to J11 including hall power and GND. The 3.3 VDC supply to the Hall sensors is

supplied from the 3.3 V LDO on the EVM. External hall power can be input through the HALL_EXT test point if a

different supply or voltage level is desired. To use the included 3.3 V LDO to power the halls, connect J12 on the

left side to pins 1:2 as shown. To use HALL_EXT, connect J12 on the right side to pins 2:3. To insert or remove

wires/terminals on J11, use a flat blade screwdriver to push down the respective tab on top of the J11 connector.

Figure 2-5. Motor Phase Connector (J13)

WARNING

Motor Phase connections must match the hall sensor connection sequence. For example, MOTA

must match HALL_A, MOTB must match HALL_B, MOTC must match HALL_C. The phases must

also be in sequential order; A, then B, then C.

If the motor phases do not match the hall sensors or the connections are made out of order, then the

motor does not spin smoothly and current consumption increases.

The three phase inputs of the motor connect to MOTA/MOTB/MOTC through connector J13.

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DRV8334 Evaluation Module 7

2.2 Faults, Indicators, and Jumper Settings

The DRV8334 implements Bootstrap Undervoltage, GVDD Undervoltage, and Thermal Shutdown in case of

overtemperature. See the DRV8334 data sheet for more information on DRV8334 fault support.

Status LEDs for the 3.3 V, PVDD, GVDD, and FAULT are included and shown below.

Figure 2-6. Status LEDs

The FAULT LED lights up if the EVM senses a fault and the same fault is reported in the SPI register. See the

complete data sheet for fault response and corrective actions.

The Faults can be reset in the GUI software using the CLEAR FAULTS button. More details on the GUI can be

found in Section 3.

Figure 2-7. On-Board PVDD Buck and 3.3V LDO

The EVM includes a buck regulator for reducing VMOTOR to 12 V in case PVDD regulation is required. The

buck feeds into the 3.3V LDO, which powers the EVM 3.3V rail.

Jumper J6 connects VMOTOR/PVDD to the PVDD buck. Remove this jumper to power down the buck regulator.

Jumper J7 connects the PVDD buck output (12V) to the 3.3V LDO. Remove this jumper to power down the 3.3V

rail.

GVDD is generated internally to the DRV8334 device and the options are explained in the complete data sheet.

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2.3 EVM Hardware Quick-Start

This section describes the steps to prepare the DRV8334EVM for first motor spin-up. This section assumes the

default jumper positions mentioned above are used.

1. Plug the DRV8334EVM onto the upper position of the LAUNCHXL-F280049C board.

2. Connect motor phase connections to their respective MOTA/MOTB/MOTC inputs on J13, making sure to

match A, B, and C.

3. Connect the Hall sensor connections, Hall power, and ground to J11. Make sure that Hall A, B, and C are in

the correct order.

4. Connect the provided micro-USB cable to the LAUNCHXL-F280049C.

5. Connect VMOTOR and GND to connector J10. A low current limit of 300 mA on the VMOTOR supply is

recommended for first power-up to verify the EVM is connected correctly. If there is no issue upon power-up,

then the current limit can be raised to allow for current based on your motor specifications. VMOTOR range

is 5 V to 60 V.

6. Start the GUI per the instructions below in Section 3.1.

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DRV8334 Evaluation Module 9

3 Software

3.1 DRV8334 EVM GUI Software

This section details the features of the EVM GUI Software. The GUI is written in GUI Composer and is available

on the development software gallery at dev.ti.com/gallery.

Figure 3-1. DRV8334EVM GUI Software

The GUI connects and programs the C2000 MCU on the LAUNCHXL-F280049C board when launched,

assuming the board is connected/powered.

Once the hardware is connected, the FAULT Status and Voltage Monitors match the EVM. If these do not match,

then please remove EVM power and recheck the setup.

To spin the motor:

1. Launch the GUI located on dev.ti.com/gallery.

2. Take the DRV8334 out of sleep mode by toggling nSLEEP to WAKE.

3. Enable the PWM using the Output Enable toggle switch.

a. The DRV8334 reports no faults (Fault LED green on GUI, no red nFAULT LED on the EVM) and

VMOTOR/GVDD voltage is reported by the GUI.

4. Set acceleration (update rate) of Duty cycle and increase PWM Duty Cycle using the slider or text input.

5. The motor now spins.

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