Texas Instruments DRV2700EVM User Manual

User's Guide

SLOU403C–March 2015–Revised June 2018

DRV2700EVM High Voltage Piezo Driver Evaluation Kit

The DRV2700 is a single-chip, high-voltage piezo driver with an integrated 105-V boost switch, integrated power diode, and integrated fully differential amplifier. This evaluation kit demonstrates:

• Multiple input modes including: 0- to 10-V single ended, PWM, and AC input modes

• Multiple output modes including: 0- to 200-Vpp differential, 0- to 105-V single and multiple ended

• 2 power supply inputs to isolate power consumption on DRV2700

• 8 convenient boost voltage settings and 4 different gain settings

• Small footprint (9 mm x 13 mm)

• Breakout for usage as a boost converter The evaluation kit is designed for all-around use and can be used not only for evaluation but can also be

used for prototyping into systems. The EVM also contains a microcontroller, LDO (3.3 V) and LEDs for status and input settings.

Evaluation Kit Contents:

• DRV2700EVM evaluation board

• Demonstration mode firmware preloaded onto microcontroller

• Downloadable software to control EVM

• Mini-B USB cable Needed for programming and advanced configuration:

• Code Composer Studio™ (CCS) or IAR Embedded Workbench IDE for MSP430

• MSP430 LaunchPad™ (MSP-EXP430G2) or MSP430-FET430UIF hardware programming tool

• DRV2700EVM firmware available on the DRV2700EVM tool folder

• MSP-JTAG2SBW JTAG to Spy-Bi-Wire adapter

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Contents

1 Getting Started ............................................................................................................... 6

1.1 Evaluation Module Operating Parameters....................................................................... 6

1.2 Quick Start Board Setup ........................................................................................... 7

1.3 Connecting a Load.................................................................................................. 7

2 Overview of EVM ............................................................................................................ 8

2.1 DRV2700............................................................................................................. 8

2.2 Microcontroller (MSP430).......................................................................................... 8

2.3 Power Supply Inputs and Path.................................................................................... 8

2.4 EN and Gain Configuration........................................................................................ 9

2.5 Inputs ............................................................................................................... 10

2.6 Outputs ............................................................................................................. 10

2.7 BST/PVDD Disconnect ........................................................................................... 10

2.8 TRIG Button........................................................................................................ 10

3 EVM Control Software (GUI).............................................................................................. 11

4 Boost Converter ............................................................................................................ 12

4.1 Boost Voltage Setting Resistors................................................................................. 13

4.2 Disconnecting BST/PVDD........................................................................................ 14

4.3 Programming the Boost Current Limit.......................................................................... 14

4.4 Boost Inductor Selection ......................................................................................... 14

4.5 Boost Capacitor Selection........................................................................................ 14

5 PWM, Analog, and Single-Ended Inputs................................................................................ 15

5.1 PWM (AC Coupled) Input Using MSP430 ..................................................................... 15

5.2 PWM (AC Coupled) Input Using AIN ........................................................................... 15

5.3 External Analog (AC Coupled) Input............................................................................ 16

5.4 Single-Ended (DC Coupled) Input .............................................................................. 16

6 Output........................................................................................................................ 19

6.1 Two Terminal Differential Output Configuration (OUT+ – OUT–)........................................... 19

6.2 Two Terminal Single Ended Output Configuration (OUT± to BST/GND).................................. 19

6.3 Three Terminal Single Ended Output Configuration (BST to OUT± to GND)............................. 20

7 Load Selection.............................................................................................................. 20

8 Filtering and Adapting PWM Waveforms................................................................................ 21

8.1 PWM Input ......................................................................................................... 21

8.2 Filter Selection Criteria ........................................................................................... 22

9 Reference ................................................................................................................... 25

9.1 Schematic .......................................................................................................... 25

9.2 PCB Layout ........................................................................................................ 26

9.3 Bill of Materials .................................................................................................... 28

1 Board Diagram ............................................................................................................... 6

2 Power Path Diagram ........................................................................................................ 8

3 Gain = 40.7 dB............................................................................................................... 9

4 Gain = 38.4 dB............................................................................................................... 9

5 Gain = 34.8 dB............................................................................................................... 9

6 Gain = 28.8 dB............................................................................................................... 9

7 GUI Interface................................................................................................................ 11

8 BST Network JP2, JP3, and JP4......................................................................................... 13

9 PWM Signal................................................................................................................. 15

10 Set Reference to External 2.5 V ......................................................................................... 17

11 Floating Reference at 3 Hz and No Load............................................................................... 17

12 Floating Reference at 1 Hz and No Load............................................................................... 17

13 DC Coupled Input Diagram ............................................................................................... 18

DRV2700EVM High Voltage Piezo Driver Evaluation Kit

List of Figures

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14 Two Terminal Differential Output......................................................................................... 19

15 Two Terminal Single Ended Output ..................................................................................... 19

16 Three Terminal Single Ended Output ................................................................................... 20

17 DRV2700EVM First- and Second-Order Filters........................................................................ 21

18 Differential, First-Order Filter ............................................................................................. 22

19 Frequency Response of the First-Order Filter.......................................................................... 22

20 Differential, Second-Order Filter ......................................................................................... 23

21 Frequency Response of the Second-Order Filter...................................................................... 23

22 DRV2700EVM Schematic................................................................................................. 25

23 All Layers.................................................................................................................... 26

24 Top Layer ................................................................................................................... 26

25 Mid Layer 1 ................................................................................................................. 27

26 Mid Layer 2 ................................................................................................................. 27

27 Bottom Layer................................................................................................................ 28

WARNING

EXPORT NOTICE Recipient agrees to not knowingly export or re-export, directly or

indirectly, any product or technical data (as defined by the U.S., EU, and other Export Administration Regulations) including software, or any controlled product restricted by other applicable national regulations, received from Disclosing party under this Agreement, or any direct product of such technology, to any destination to which such export or re-export is restricted or prohibited by U.S. or other applicable laws, without obtaining prior authorization from U.S. Department of Commerce and other competent Government authorities to the extent required by those laws. This provision shall survive termination or expiration of this Agreement. According to our best knowledge of the state and enduse of this product or technology, and in compliance with the export control regulations of dual-use goods in force in the origin and exporting countries, this technology is classified as follows:

US ECCN: 3E991 EU ECCN: EAR99

And may require export or re-export license for shipping it in compliance with the applicable regulations of certain countries.

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Cautions and Warnings

CAUTION:

Warning! Do not leave EVM powered when unattended.

HOT SURFACE:

Warning Hot Surface! Contact may cause burns. Do not touch. Please take the proper

precautions when operating.

HIGH VOLTAGE:

Danger High Voltage! Electric shock possible when connecting board to live wire. Board should

be handled with care by a professional. For safety, use of isolated test equipment with

overvoltage/overcurrent protection is highly recommended.

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WARNING

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General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines

Always follow TI’s setup and application instructions, including use of all interface components within their recommended electrical rated voltage and power limits. Always use electrical safety precautions to help ensure your personal safety and those working around you. Contact TI's Product Information Center

http://support/ti./com for further information.

Save all warnings and instructions for future reference.

Failure to follow warnings and instructions may result in personal injury, property damage, or death due to electrical shock and burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed printed circuit board assembly. It is intended strictly for use in development laboratory environments,

solely for qualified professional users having training, expertise and knowledge of electrical safety risks in development and application of high voltage electrical circuits. Any other use and/or application are strictly prohibited by Texas Instruments. If you are not suitable qualified, you should

immediately stop from further use of the HV EVM.

1. Work Area Safety

1. Keep work area clean and orderly.

2. Qualified observer(s) must be present anytime circuits are energized.

3. Effective barriers and signage must be present in the area where the TI HV EVM and its interface electronics are energized, indicating operation of accessible high voltages may be present, for the purpose of protecting inadvertent access.

4. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other related apparatus used in a development environment exceeding 50Vrms/75VDC must be electrically located within a protected Emergency Power Off EPO protected power strip.

5. Use stable and nonconductive work surface.

6. Use adequately insulated clamps and wires to attach measurement probes and instruments. No freehand testing whenever possible.

2. Electrical Safety As a precautionary measure, it is always a good engineering practice to assume that the entire EVM may have fully accessible and active high voltages.

1. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely de-energized.

2. With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring, measurement equipment connection, and other application needs, while still assuming the EVM circuit and measuring instruments are electrically live.

3. After EVM readiness is complete, energize the EVM as intended.

WARNING: WHILE THE EVM IS ENERGIZED, NEVER TOUCH THE EVM OR ITS ELECTRICAL CIRCUITS AS THEY COULD BE AT HIGH VOLTAGES CAPABLE OF CAUSING ELECTRICAL SHOCK HAZARD.

3. Personal Safety

1. Wear personal protective equipment (for example, latex gloves or safety glasses with side shields) or protect EVM in an adequate lucent plastic box with interlocks to protect from accidental touch.

Limitation for safe use:

EVMs are not to be used as all or part of a production unit.

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DRV2700EVM High Voltage Piezo Driver Evaluation Kit

Getting Started

1 Getting Started

The DRV2700EVM is designed for flexible use for prototyping as well as evaluation. Figure 1 shows the names and locations of the various elements on the EVM. To power the board, connect the DRV2700EVM to an available USB port on your computer using a mini-B USB cable. The default board settings cause the microcontroller (MSP430) to control the inputs of the DRV2700 at power up. The MSP430 has each of these control settings low which disables the DRV2700, by default. Figure 1 shows the basic board diagram of the DRV2700EVM. Table 2 shows the original configuration of the jumpers, as shipped.

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1.1 Evaluation Module Operating Parameters

Table 1 lists the operating conditions for the DRV2700 on the evaluation module.

Parameter Specification

Supply voltage range 3.6 V to 5.5 V

Power-supply current rating 500 mA

Input Voltage 0 V to V

Max Output Voltage 200 Vpp

DRV2700EVM High Voltage Piezo Driver Evaluation Kit

Figure 1. Board Diagram

Table 1. Typical Operating Conditions

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1.2 Quick Start Board Setup

The DRV2700EVM comes with preprogrammed firmware to provide a 0- to 200-Vpp signal between OUT+ and OUT–.

1. Out of the box, the jumpers are set to begin demo mode using USB power. The default jumper settings are found in Table 2.

2. Connect a mini-USB cable to the USB connector on the DRV2700EVM board.

3. Connect the other end of the USB cable to an available USB port on a computer, USB charger, or USB battery pack.

4. If the board is powered correctly, the 5-V LED is on.

5. Enable the output using the GUI or programmatically through the computer, see GUI Interface for additional assistance. If using an external input signal, EN the output by changing the jumper (JP9) or equivalent control signal.

6. Once the output is EN, the device allows for the high-voltage output.

Parameter Jumper Setting Default Specification

Open MSP not connected to either power supply

JP10 MSP

JP11 DRV

JP5 and JP6

JP9-EN JP8-G1 JP7-G0

JP13-DCIN

JP12-VBST

I2C Open Always leave open. Never jumper together.

J2, J3, J4

(1)

In the table, (top) or (bottom) means the (top) or (bottom) is connected to the middle of the 3-terminal header. For questions, refer to Figure 1.

USB (top) VIN (bottom) Open DRV2700 not connected to either power supply VIN (top) USB (bottom) Open Disconnected PWM± and I/O of MSP430 Connected X Connected PWM± and I/O of MSP430 Open EN/G1/G0 pulled internally to GND through DRV2700 internal resistance MSP (top) PU (bottom) Open X DC input not connected (PWM and AC input mode) Connected DC input connected (single-ended input mode) Open PVDD disconnected to BST (boost only mode) Connected X PVDD connected to BST (normal operation)

Open Disconnects particular FB resistor (lowers BST) Connected X Connects particular FB resistor (raises BST)

(1)

Getting Started

Table 2. Default Jumper Settings

X MSP connected to USB power supply

MSP connected to VIN power supply

DRV2700 connected to VIN power supply

X DRV2700 connected to USB power supply

X EN/G1/G0 tied to I/O of MSP430

EN/G1/G0 pulled up to MSP power supply through external pull up resistor

1.3 Connecting a Load

1. With the power supply off, connect the negative terminal of the load to OUT– and connect the positive terminal of the load to OUT+

2. Ensure the terminals are connected correctly, then enable the supply

Before connecting the load, ensure that the load is rated for the selected output voltage. If not, see the Boost Voltage Setting

Resistors section to adjust the DRV2700 maximum output voltage.

See Figure 13 for a diagram of the input configuration.

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WARNING

DRV2700EVM High Voltage Piezo Driver Evaluation Kit

USB

Power

VIN

External

MSP HeaderDRV Header

Power to Rest of Board

Power to DRV2700

Overview of EVM

2 Overview of EVM

The following sections provide a description of each of the blocks identified in Figure 1.

2.1 DRV2700

The DRV2700 is a single-chip, high-voltage piezo driver with an integrated 105-V boost switch, integrated power diode, and integrated fully-differential amplifier. This EVM allows the designer to evaluate this device and appropriately prototype it into their design. See the DRV2700 (SLOS861) datasheet for more in-depth information.

2.2 Microcontroller (MSP430)

An onboard MSP430F5510 is used to control the various input signals as well as communicate through the USB to the GUI. See the Quick Start Board Setup section for how to setup and run with the GUI.

2.3 Power Supply Inputs and Path

Two power supply inputs are available to power the EVM: USB power and V Each of these inputs can be used to power the entire board or parts of the board.

2.3.1 USB Power Input

The USB power input can be supplied from a standard USB port on a computer, USB charger, or USB battery pack. This input is intended for ease-of-use and can be routed to power all circuitry on the EVM. Additionally, this input has a 5-V LED indicator showing that power is being supplied to the EVM. If the GUI is going to be used, the USB must be connected to the computer and JP10 routed to USB connection.

EXTERNAL

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(Ext VIN on the EVM).

2.3.2 VIN/External Power Input

Provide the VIN power input with an external 3.6- to 5.5-V power supply. Additionally, this input can power the entire board.

2.3.3 Power Path Selection

Each of the two power supply inputs can be routed to the DRV2700 or the rest of the IC. The positions of the jumpers are described in Table 2 or can be read from the silkscreen of the EVM. Figure 2 shows the basic diagram of the power paths.

If a power measurement of the DRV2700 circuitry is desired, it is best to provide the MSP jumper (JP10) with USB power and the DRV jumper (JP11) with VIN. With this configuration, measuring the provided voltage and current into VIN gives the power consumption of the DRV2700.

Figure 2. Power Path Diagram

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2.4 EN and Gain Configuration

The EN, GAIN0, and GAIN1 inputs into the DRV2700 have 4 different driving configurations:

• Driven through the MSP430. This is done by connecting the configuration jumper to the “MSP” state (default).

• Pulled to a logic level high through pullup resistor. This is done by connecting the configuration jumper to the “PU” state.

• Pulled to a logic level low through internal pulldown resistor. This is done by removing the configuration jumper.

• Driven externally. This is done by connecting the external control signal to the center 100-mil header.

Each of these signals have an LED to indicate when the signal is at a logic-level high. Additionally, the GAIN pins control the internal gain of the high voltage amplifier. Table 3 shows the 4 gain

settings

GAIN1 GAIN0 Gain (dB)

Low Low 28.8

Low High 34.8 High Low 38.4 High High 40.7

Overview of EVM

Table 3. Gain Settings

Figure 3 through Figure 6 showcase all 4 gain settings with BST set to max of 105 V (JP2, JP3, and JP4

closed). C3 = BST, C1 = VOUT(+), C2 = VOUT(–), and MATH = OUT(+) – OUT (–). PWM input from MSP430 of 0–3.3 V, 300 Hz and 50% duty cycle.

Figure 3. Gain = 40.7 dB Figure 4. Gain = 38.4 dB

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Overview of EVM

2.5 Inputs

The analog input (AIN) is used for PWM and analog inputs. The single-ended (DC) input test point is used when a DC input is desired. See PWM, Analog, and Single-Ended Inputs, for more information.

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Figure 5. Gain = 34.8 dB Figure 6. Gain = 28.8 dB

2.6 Outputs

The DRV2700EVM has 4 referenced outputs (BST, OUT–, OUT+, and GND). They are output from a terminal block to mitigate touching between two high voltage lines. See the Output section for additional information.

2.7 BST/PVDD Disconnect

The BST jumper (JP12) is provided to allow disconnecting between PVDD and BST. This enables the DRV2700EVM to be configured purely as a boost converter. See Disconnecting BST/PVDD, for additional information.

2.8 TRIG Button

The DRV2700EVM has a built-in trigger button for user prototyping. If different modes of operation are desired without using the GUI, the MSP430 can be programmed such that the trigger button can cycle through different modes. Additionally, there are 3 test point pads that be can be used in a similar manner through MSP430 firmware programming.

See Figure 13 for a diagram of the input configuration.

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Gain Settings

and Boost Chart

EN Output

Output Timing

Output

Status

Standard Drive vs Audio Drive

Frequency

Control

Duty Cycle

Control

Note

and/or Frequency Generator

Simple

Piano

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3 EVM Control Software (GUI)

By default, the DRV2700EVM can be controlled programmatically through the GUI Interface. Figure 7 is a screenshot of the GUI.

Run the GUI by downloading it from the DRV2700 product page, installing the GUI and then running it. When prompted, connect to the USBHID setting.

EVM Control Software (GUI)

Figure 7. GUI Interface

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DRV2700EVM High Voltage Piezo Driver Evaluation Kit

+ 24 hidden pages

Texas Instruments DRV2700EVM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual