PD32 - 32 Channel Piezo Driver

PD32 Multi Channel Piezo Driver

The PD32 is a high-bandwidth, low-noise amplifier for driving up to 32 piezoelectric actuators. The voltage range is configurable from +50V to +/-140V and includes asymmetric voltage ranges such as -20V to +120V. The PD32 works seamlessly with common multi-channel DAC cards and provides exceptional ease of use and compatibility with programming tools such as LabView and Simulink. The compact size and 19-inch rack compatibility provides a comprehensive off-the-shelf solution for driving tens, hundreds, or thousands of piezoelectric actuators.

The PD32 is designed for demanding applications such as Adaptive Optics, Acoustic Beam Forming, Materials Testing, Astronomy, Ultrasonics, and Vibration Control. With an output current of 150mA per channel, a large array of piezoelectric actuators can be driven simultaneously at high frequencies. Positive and negative high-voltage bias outputs are also included for compatibility with piezoelectric bender actuators.

Compatible Actuators
Stack Actuators 60V, 100V, 120V, 150V
Plates and Tubes up to +/-140V
Two Wire Benders up to +/-140V
Three Wire Benders up to 140V, or +/-75V

Each channel is individually protected against short circuit and thermal overload. Status indicators on the front panel provide individual monitoring of all channels. A digital status signal and external shutdown command is also accessible from the input connector to allow remote monitoring and control. The input and output connectors are industry standard 37 Pin D-Sub connectors which are straight-forward to assemble. Adaptors are available for industry standard 32 Channel DAC cards.

enquiry

Specifications

Unipolar OutputBipolar Output
Output Voltage +50 V to +140 V +/-50 V to +/-140 V
Peak Current 150 mA per channel 75 mA per channel
RMS Current 106 mA per channel 53 mA per channel
Power Bandwidth 50 kHz (120 Vp-p) 50 kHz (240 Vp-p)
Signal Bandwidth 120 kHz 120 kHz
Slew Rate 19 V/us 38 V/us
Gain 15 V/V 20 V/V
Input Impedance 53 kOhm 6.25 kOhm
Input Offset +/- 5 mV +/- 5 mV
Load Unlimited Unlimited
Output Noise 200 uV RMS (1uF) 300 uV RMS (1uF)
Protection Short circuit and thermal
Inputs 32 Analog inputs, shutdown command
Outputs 32 HV Analog outputs, overload monitor
Connectors Industry standard DB-37 (input) and DD-78 (output)

Mechanical Specifications
Environment 0 - 40 C (32-104 F), Non-condensing humidity
Dimensions 212 x 304.8 x 88 mm (8.35 x 12 x 3.46 in)
Weight 2 kg (4.4 lb)

Output Voltage Range

The output voltage range is configurable between +50V and +/-140V and the load can be either grounded or floating. For peak-to-peak voltages less than 140V, the grounded load configuration is recommended since this provides greater current. The floating load configuration is required for the +/-100V and +/-140V ranges. The desired configuration should be specified at the time of ordering.

Grounded Load Configurations

In the grounded load configurations, the actuator connections are illustrated below. The negative output is internally grounded.

PD32 Grounded Load Configuration

Grounded Load Configuration

The desired output voltage range can be selected from the following table.

Min VoltageMax VoltageOrder Code
0 +140 PD32C-140
0 +120 PD32C-120
0 +100 PD32C-100
0 +70 PD32C-70
0 +50 PD32C-50
 
-20 +120 PD32C-20/120
-20 +100 PD32C-20/100
 
-72 +72 PD32C-72/72
-48 +48 PD32C-48/48

Grounded Load Voltage Ranges

Three wire bender actuators can be driven using the following connection diagram. The HV+ and HV- bias voltages are the minimum and maximum voltages listed in the table above and are accessible on the output connector.

PD32 Bender Drive Circuit

Driving Bender Actuators

Floating Load Configurations

The floating load configuration is useful for achieving higher peak-to-peak voltage swings. The connection diagram is illustrated below. Do not connect either of these signals to ground, for example, to the ground terminal of an oscilloscope probe.

PD32 Floating Load Configuration

Floating Load Configuration

The desired output voltage range can be selected from the following table.

Min VoltageMax VoltageOrder Code
-140 +140 PD32C-140/140
-100 +100 PD32C-100/100

Floating Load Voltage Ranges

Input Connection Diagram

The front panel input connector is an industry standard DB37 Female Connector (TE 1658612-1). Any Male DB-37 cable plug is compatible. The connection diagram is illustrated below.

SignalsConnector PinNotes
Analog Inputs 1 to 32 1 - 32 +/-10V max
Ground 33, 34
Not Connected 35
Digital disable command36 3.3V or 5V logic
Overload indicator 37 5V logic

Input Connector Signals

PD32 Input Connector Pinout
Input Connector Pinout

Output Connection Diagram

The front panel output connector is an industry standard DD78 Female Connector (TE 5748483-5). Any Male DD-78 cable plug is compatible. The connection diagram is illustrated below.

SignalsConnector PinNotes
Outputs 1 to 16 (positive) 1 - 16
Ground 17, 20
HV+ 18, 19 For driving benders
Outputs 1 to 16 (negative) 21 - 36
Ground 37
HV- 38, 39 For driving benders
Outputs 17 to 32 (positive) 40 - 55
Ground 56, 59
HV+ 57, 58 For driving benders
Outputs 17 to 32 (negative) 60 - 75
Ground 76
HV- 77, 78 For driving benders

Output Connector Signals

PD32 Output Connector Pinout
Output Connector Pinout

Output Current

The peak output current is 150 mA per channel in the grounded load configuration or 75 mA per channel in the floating load configuration. The maximum RMS current is 106 mA in the grounded configuration and 53 mA in the floating load configuration.

The maximum output current from all channels is 3 Amps RMS.

Power Bandwidth

Power Bandwidth Calculator (Grounded Load)

Power Bandwidth Calculator (Floating Load)

The nominal slew-rate of the PD32 is 19 V/us. Therefore, the maximum frequency sine-wave is $$ f_{max}= \frac{19 \times 10^6}{\pi~V_{L(p-p)}} $$ That is, the power bandwidth for a 120 Vp-p sine-wave is 50 kHz. In the floating load configuration, the slew-rate is doubled to 38 V/us, therefore, the power bandwidth for a 240 Vp-p sine-wave is 50 kHz.

With a capacitive load, the power bandwidth is limited by the output current. The maximum frequency sine wave is $$ f_{pwr} = \frac{I_{pk}}{\pi V_{L(p-p)}~C_L} $$ where \(I_{pk}\) is the peak current limit, \(V_{L(p-p)}\) is the peak-to-peak output voltage, and \(C_L\) is the effective load capacitance. The power bandwidth versus load capacitance is listed below.

LoadPeak to Peak Voltage (Grounded)
Cap50100V140V
10 nF95 kHz47 kHz34 kHz
30 nF31 kHz15 kHz11 kHz
100 nF9.5 kHz4.7 kHz3.4 kHz
300 nF3.1 kHz1.5 kHz1.1 kHz
1 uF950 Hz470 Hz340 Hz
3 uF310 Hz150 Hz114 Hz
10 uF96 Hz48 Hz34 Hz
30 uF32 Hz16 Hz11 Hz

Power Bandwidth versus Load Capacitance (Grounded Load)

LoadPeak to Peak Voltage (Floating)
Cap100200V280V
10 nF23 kHz11 kHz8.5 kHz
30 nF7.9 kHz3.9 kHz2.8 kHz
100 nF2.3 kHz1.1 kHz850 Hz
300 nF790 Hz390 Hz284 Hz
1 uF230 Hz119 Hz85 Hz
3 uF80 Hz40 Hz28 Hz
10 uF24 Hz12 Hz9 Hz
30 uF8 Hz4 Hz3 Hz

Power Bandwidth versus Load Capacitance (Floating Load)

In the following figures, the maximum frequency periodic signal is plotted against the peak-to-peak voltage.

PD32 Power Bandwidth (Grounded Load)

Maximum Frequency versus Load Capacitance (Grounded Load)

PD32 Power Bandwidth (Floating Load)

Maximum Frequency versus Load Capacitance (Floating Load)

Small Signal Bandwidth

The small-signal bandwidth and frequency response is described in the following table and figure.

Load Cap.Bandwidth
No Load120 kHz
10 nF90 kHz
30 nF40 kHz
100 nF11 kHz
300 nF3.8 kHz
1 uF1.0 kHz
3 uF320 Hz
10 uF62 Hz
30 uF24 Hz

Small signal bandwidth versus load capacitance (-3dB)

PD32 Small Signal Frequency Response

Small signal frequency response

Overload Protection / Shutdown

Each channel is protected against short-circuit and thermal overload. If the thermal overload on any channel engages, the front panel indicator for that channel will illuminate. In addition, an overload on any channel will cause the overload signal (pin 37) on the input connector to go high (+5V).

The amplifier can also be disabled by applying a logic high (3.3V to 5V) to the disable pin (pin 36).

Enclosure

The PD32 has a side air intake and rear exhaust. These vents should not be obstructed. If sufficient air-flow is not available, the amplifier will enter a thermal overload state as discussed above.

The PD32 amplifier can be rack-mounted in a single or side-by-side arrangement. A DAC card adaptor can also be rack mounted in a single or side-by-side arrangement with another adaptor or the amplifier itself. A single amplifier or adaptor can be mounted with the PD32-Rack1 kit. Two adaptors, amplifiers, or a combination of both can be mounted side-by-side with the PD32-Rack2 kit.

Input Test Connector and Cable

An adaptor PCB is supplied which connects all input channels to a single BNC connector. A 2.5ft DB37 (Male-Male) input cable is also supplied.

Breakout Board and Cable (PD32-Breakout)

A screw-terminal breakout board is included which connects to the amplifier via a Female DD78 connector (TE 5748483-5) and HD78 Male-Male cable (2.5 ft). If required, the board can be mounted onto a base structure using the installed M3 hex spacers.

PD32 Output Breakout Board

Output breakout board

Signal Adaptors

The signal adaptors allow a direct connection to common multi-channel DAC cards. Standard adaptors are listed below; however, custom adaptors can also be created.

ManufacturerDAC CardSignal AdaptorNotes
National InstrumentsPCI-6723PD-6723Requires NI SH68-C68-S Cable
National InstrumentsPXI-6723PD-6723Requires NI SH68-C68-S Cable

Standard Signal Adaptors

The adaptors are contained in a compact desktop enclosure which can be mounted in a side-by-side arrangement with another adaptor or an amplifier. A single amplifier or adaptor can be mounted with the PD32-Rack1 kit. Two adaptors, amplifiers, or a combination of both can be mounted side-by-side with the PD32-Rack2 kit.

Safety

This device produces hazardous potentials and should be used by suitably qualified personnel. Do not operate the device when there are exposed conductors.

An NRTL version is available for USA customers which uses an external 24 Vdc power supply.

Warranty

The PDC32 is guaranteed against manufacturer defects for a period of 12 months.