Texas instruments OPA564DWP-EVM User Manual

User's Guide

SBOU219–February 2020

OPA564DWP-EVM

This user’s guide describes the design, operation, and use cases of the OPA564 evaluation module
(EVM) for the DWP package only; this EVM cannot be used with the OPA564 DWD package. This guide
discusses how to set up and configure the board hardware, and describes five different applications this
evaluation module can be used for. Throughout this document, the terms evaluation module, EVM, or
simply board are synonymous with the OPA564DWP-EVM. This document also includes an electrical
schematic, a printed circuit board (PCB) layout drawing, and a parts list for this EVM.

1 Overview...................................................................................................................... 3

1.1 OPA564 Overview .................................................................................................. 3

1.2 General Overview of the OPA564DWP-EVM................................................................... 3

1.3 Related Documentation from Texas Instruments............................................................... 4

2 Hardware...................................................................................................................... 5

2.1 Power Supply........................................................................................................ 5

2.2 Inputs................................................................................................................. 5

2.3 Outputs............................................................................................................... 5

2.4 Jumpers.............................................................................................................. 6

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Contents

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OPA564DWP-EVM

1

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2.5 LEDs.................................................................................................................. 6

2.6 Enable-Disable Feature............................................................................................ 6

2.7 Current Limitation Capability ...................................................................................... 6

3 Configuration Examples..................................................................................................... 7

3.1 Noninverting Amplifier Configuration Setup ..................................................................... 7

3.2 Inverting Amplifier Configuration Setup .......................................................................... 9

3.3 Differential Amplifier Configuration Setup...................................................................... 11

3.4 Improved Howland Current Pump Configuration Setup...................................................... 13

3.5 Bridge-Tied Load Configuration Setup ........................................................................ 15

4 Schematics, PCB Layout, and Bill of Materials......................................................................... 17

4.1 Schematics......................................................................................................... 17

4.2 PCB Layout ........................................................................................................ 18

4.3 Bill of Materials .................................................................................................... 21

List of Figures

1 Noninverting Amplifier Configuration Schematic ........................................................................ 7

2 Noninverting Operation ..................................................................................................... 8

3 Inverting Amplifier Configuration Schematic ............................................................................. 9

4 Inverting Operation......................................................................................................... 10

5 Differential Amplifier Configuration Schematic ......................................................................... 11

6 Differential Operation ...................................................................................................... 12

7 Improved Howland Current Pump Schematic .......................................................................... 13

8 Bridge-Tied Load Schematic.............................................................................................. 15

9 Bridge-Tied Load Operation .............................................................................................. 16

10 OPA564DWP-EVM Schematic .......................................................................................... 17

11 OPA564DWP-EVM, Top Layer .......................................................................................... 19

12 OPA564DWP-EVM Bottom Layer ....................................................................................... 20

1 Related Documentation ..................................................................................................... 4

2 Basic Jumper Functions .................................................................................................... 6

3 Status of the LEDs........................................................................................................... 6

4 Noninverting Configuration ................................................................................................. 7

5 Inverting Configuration ...................................................................................................... 9

6 Differential Configuration .................................................................................................. 11

7 Improved Howland Current Pump Configuration....................................................................... 13

8 Bridge-Tied Load Configuration: Board 1 ............................................................................... 15

9 Bridge-Tied Load Configuration: Board 2 ............................................................................... 16

10 Bill of Materials ............................................................................................................. 21

Trademarks

PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.

List of Tables

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1 Overview

1.1 OPA564 Overview

The OPA564 is a low-cost, high-current, operational amplifier (op amp) capable of providing up to 1.5 A of
current to an output load. The high slew rate of this op amp provides 1.3-MHz, full-power bandwidth and
excellent linearity. This monolithic integrated circuit provides high reliability in demanding powerline
communications and motor-control applications.

1.1.1 OPA564 Safety Considerations

The OPA564 op amps can use a power-supply voltage as great as 24 V in single-supply connection, or
±12 V in dual-supply connection, both of which represent a potential difference of 24 V. The possibility for
accidental electrical shock increases with the increased potential difference and the user must take
precautions to avoid contact with the PCB when live voltage is present. If circuit probing is required and
voltages are present, best practice is to apply the one hand rule. Use an insulated probe and only one
hand when probing the live circuit. Keep the other hand away from the circuit and any metal contacts in
the immediate area through that current can flow.

Power op amps can generate a lot of heat under certain operating conditions. This excess heat must be
conducted away from the amplifier in order to maintain correct operation and long life. The DWP package
contains the PowerPAD™ heat sink located on the bottom for this purpose. Still, the device under test
(DUT) might grow hot during the test; therefore, avoid contact with the DUT when the circuit is in use, or
during cool down after use.

Overview

1.2 General Overview of the OPA564DWP-EVM

This DWP package-specific OPA564 evaluation module (EVM), allows users to easily evaluate design
concepts. This EVM is easily configured as a noninverting, inverting, or difference amplifier, as an
improved Howland current pump, or as a BTL (bridge tied load) circuit. BTL requires two EVMs used
concurrently to create this circuit configuration, however. This guide discusses all individual circuit
configurations and hardware setup associated.

This EVM is based on a 5.0-inch × 3.5-inch (12.7-cm × 8.9-cm) PCB that accommodates the 20-lead,
DWP powerPAD package. This EVM cannot be used with the OPA564 DWD package.

The OPA564 can be operated with either a single supply (V+ and ground), or dual supplies (V+ and V–);
therefore, the EVM is designed to be used in either mode. A jumper (J13) sets the supply condition. The
enable-shutdown function and thermal shutdown indicator are functional with either supply arrangement;
shutdown mode is a low current, output disabled mode.

Three LEDs (green, orange, and red) indicate EVM functionality. A green LED (D1) illuminates when V+ is
applied. A red LED (D9) illuminates when the amplifier is in thermal shutdown mode (for approximately 10
µs or longer), and both the red and orange LED (D4) illuminate when the amplifier is set to shutdown
mode (through jumper J11). During normal operation, the yellow and red LEDs are off.

1.2.1 Supply Voltage Considerations for the OPA564DWP-EVM

The OPA564DWP-EVM is designed to be powered by the user’s single or dual, high-current, high-voltage
power supply. In dual-supply configuration, set the minimum V+ and V– levels at ±3.5 V. In single power­supply mode, use a minimum of V+ = 7 V for correct functionality. Do not exceed the maximum supply
voltage of 24 V in single-supply mode (V+), or ±12 V in dual-supply mode.

If required, disable the OPA564 by placing a shunt on jumper J11.

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Overview

1.3 Related Documentation from Texas Instruments

This user's guide is available from the TI web site under literature number SBOU219. Any letter appended
to the literature number corresponds to the document revision that is current at the time of the writing of
this document. Newer revisions may be available from the TI web site, or call the Texas Instruments'
Literature Response Center at [phone] or the Product Information Center at [phone]. When
ordering, please identify the document by both title and literature number.

Table 1 gives links to the OPA564 data sheet, and an in-depth Howland current pump application note.

Table 1. Related Documentation

Document Literature Number

OPA564 product data sheet SBOS372

AN-1515 A Comprehensive Study of the Howland Current Pump application note SNOA474

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2 Hardware

This section details the purpose of the EVM connectors and jumpers, and methods of configuring the EVM
for taking measurements.

See Section 4 for the OPA564DWP-EVM schematic.

2.1 Power Supply

Power is provided to the OPA564DWP-EVM through three banana jacks: AVDD (V+), GND, and AVSS
(V–). The EVM can be configured to use a single 7-V to 24-V supply (by placing a shunt on the right-hand
side of J13, thus connecting V– to GND), or a dual ±3.5-V to ±12-V supply (by placing a shunt on the left­hand side of J13, thus connecting V– to AVSS). Use a power supply that is capable of providing at least
2× the anticipated continuous current to account for peak current conditions. Furthermore, make certain
that any cables used to carry high current are rated for such use.

2.2 Inputs

The input to the EVM may be a dc signal, an ac signal (such as that from a signal generator), or any other
signal within the common-mode voltage range. Be aware that 50-Ω termination resistors are not installed
at the EVM inputs. If necessary, external, higher-wattage BNC terminators can be added at the EVM input
connectors. Excessive power dissipation, under high input voltage conditions, can result in potential failure
of the device.

The signal presented to the inverting OPA564 input pin (Vin–) is selected through jumper J3. Vin– can be
set to GND by placing a shunt on the upper portion of J3, or a signal applied at the BNC input connector
J2 by placing a shunt on the lower portion of J3.

The signal presented to the noninverting input (Vin+) can be adjusted as follows:

• Place a shunt on J4 to connect Vin+ to a signal applied at the BNC input connector J1.

• Place a shunt on J5 to set Vin+ to GND.

• Place a shunt on J6 to set Vin+ to a voltage value midway between the two supplies.

• Place a shunt on J7 to set Vin+ to an externally set voltage (through TP5), or to offset the input voltage
by the externally set reference voltage value.

• Place a shunt on J9 to reference Vin+ to ground through a 10-kΩ resistor. This setting is necessary for
correct difference amplifier operation.

Hardware

2.3 Outputs

Output signals derived from the EVM can be monitored in a number of ways. The OPA564DWP-EVM can
be accessed through a BNC connector (J17), intended for an instrument connection (an oscilloscope, for
example) , or a pair of female banana jacks (J15, J16), intended for carrying high output current.

The OPA564 can drive a variety of loads, some of which may be large or have to dissipate a significant
amount of power. Therefore, an external load can be applied to the OPA564DWP-EVM for high-power
applications. Alternatively, for low-power applications, a load resistor can be added through the R26
footprint.

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5

lim

1.2 V

R5 5 k

 :

Hardware

2.4 Jumpers

A description of basic jumper functions is shown in Table 2. More information can be found in Section 2.

Jumper Description

J3 Selects the signal presented to the amplifier Vin– pin
J4, J5, J6 Selects the signal presented to the amplifier Vin+ pin
J7 Selects the reference voltage to the amplifier positive input (external Vref)
J8 Selects the current limit for OPA564
J9 Allows the user to reference the noninverting input to ground via a 10-kΩ resistor. Used in difference

J11 Disables or enables the OPA564 output
J13 Allows the user to select single or dual power-supply mode

2.5 LEDs

Table 3 describes the status of the LEDs during illumination. More details can be found in Section 2.

LED Description

Green Board is power on
Red The device is in thermal shutdown mode
Red + Orange The device is in shutdown mode

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Table 2. Basic Jumper Functions

amplifier circuit setup.

Table 3. Status of the LEDs

2.6 Enable-Disable Feature

The EVM provides a means to test the enable-disable functionality of the OPA564. Place a shunt across
J11 to disable the amplifier output stage. Remove the shunt to enable the amplifier, except when the
amplifier is in thermal shutdown mode. LEDs indicate the current EVM status (see Table 3).

2.7 Current Limitation Capability

The OPA564 maximum current output is 1.5 A, and is set by a resistor connected between the negative
supply (V–) and the amplifier Iset pin. The OPA564DWP-EVM provides the means to limit the maximum
output current through jumper J8. There are four current limit settings available:

• The top row of J8 limits the output current to 0.45 A

• The second row from the top of J8 limits the current to 0.65 A

• The third row from the top of J8 limits the current to 1.41 A

• The bottom row of J8 is used for setting the current limit using a custom resistor, R5. The equation
governing current limit is as follows:

For detailed information on limiting OPA564 output current, see the OPA564 data sheet.

(1)

6

OPA564DWP-EVM

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Current

Limit
Flag

Thermal

Flag

V

DIG

V+

Enable/Shutdown

T

SENSE

Current

Limit

Set

OPA564AIDWP

R

SET

(2)

(19)

(17, 18)

±IN

+IN

(6)

(7)

(3)

(8)

(4)

(15, 16)

R20 0

R16 10 k

R

9 1

k

R10 1 k

(9)

(12)

V±

(1, 10, 11, 20)

(13, 14)

V

OUT

R21 0

R24 10

C21 10 n

+

±

(5)

VOUT

Vin+

+

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3 Configuration Examples

3.1 Noninverting Amplifier Configuration Setup

The EVM can be set to a noninverting amplifier configuration, as shown in Figure 1. This configuration can
be operated in dual-supply or single-supply mode.

Configuration Examples

Table 4 gives the noninverting amplifier configuration details.

Reference Setting Function

C15, C16, R17 Not installed —

R20, R21 0 Ω —

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Figure 1. Noninverting Amplifier Configuration Schematic

Table 4. Noninverting Configuration

J13 AVSS, GND Selects AVSS (dual supply) or GND (single supply)

J3 GND Routes Vin– across R9 to ground
J4 Vin+ Routes Vin+ across R10 to the input signal (J1)

J5-7, J9 Open —

C6, C7 Not installed —

R10 1 kΩ —
R16 10 kΩ —

J11 Open Output is enabled

J8 0.45 A Current limit set to 0.45 A

R26 Not installed —

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