Micromechatronics, Inc. (MMech)

www.mmech.com - Ph: 814-861-5688

PDu100B Miniature Piezo Driver

Piezoelectric Drivers

Piezodrive_PDu100B_medium

pdf-icon_sm PDu100B Specifications

keypad_sm Calculate Power Bandwidth

Specifications:

PDu100B Specifications
Power Supply 3 V to 5.5 V
Max. Unipolar Output +60V +90 V +100 V
Max. Bipolar Output +/-60 V +/-90 V +/- 100 V
Av. Output Current +/-40 mA +/-18mA +/-15mA
Power Bandwidth 5.3 kHz 3.5 kHz 3.2 kHz
Peak Output Current 100 mA
Signal Bandwidth 60 kHz (unloaded)
Dimensions 39 x 25 mm (1.5 x 1 in)
Weight 5.5 g (0.2 oz)
Gain 27.5 V/V
Input Unipolar          Bipolar
Input Impedance 100 kohm        20 kohm
Input Offset +/- 100 mV
Load Unlimited capacitance loads
Overload Thermal and current overload protection
Noise 70 mV RMS (10uF Load)
Environment -40 to 70 Celsius (-40 to 158 F)
Non-condensing humidity
Input Offset 25 mA (1 mA in Shutdown)

Features

  • The PDu100B is a complete miniaturized power supply and linear amplifier for driving piezoelectric actuators. The PDu100B provides variable gain and offset, switchable voltage ranges, and the choice between ground referenced or differential inputs and outputs. The PDu100B can drive two-wire piezoelectric actuators and benders up to +/-100V and three-wire piezoelectric benders and stack actuators up to +100V. Applications include piezoelectric valves, motors, pumps and low-power positioning and manipulation systems.
  • Key features include:
    • Selectable output voltage range 100V, 90V, or 60V
    • Bipolar or unipolar output
    • Bias supply for three-wire bender actuators
    • Peak output current: 100mA
    • Average output current: 40mA
    • Supply voltage: 3V to 5.5V
    • Dimensions: 25x40mm (1x1.5in)
    • Mass: 5.5 grams (0.2oz)

Configuration

The PDu100B can be configured to suit a wide variety of applications. The output voltage range is selected by Switch 1 (S1) as shown below.

S1.1S1.2Unipolar RangeBipolar Range
On On 100 V +/-100 V
On Off 90 V +/-90 V
Off On 70 V +/-70 V
Off Off 60 V +/-60 V

The input type can be configured to either unipolar or bipolar with Switch 2 (S2), as shown below.

Input TypeS2.1S2.2Apply toInput Range
Unipolar On Off Vup 0.5Vs +/-1.8 V
Bipolar Off On Vbp +/-3.6 V

The overall system gain is determined by the configuration of the input and output. The possible combinations are listed below.

Input TypeOutput TypeGainInput RangeOutput Range
Unipolar Unipolar 27.5 0.5Vs +/-1.8V 100V
Unipolar Bipolar 55 0.5Vs +/-1.8V +/-100 V
Bipolar Unipolar 13.75 +/-3.6 V 100V
Bipolar Bipolar 27.5 +/-3.6 V +/-100V

Both outputs are biased at approximately half the HV bus voltage VHV, e.g. 50 V with a 100 V range. The output voltage equations are listed below.

Input TypeOutput TypeOutput Equation
Unipolar Unipolar Formula1
Unipolar Bipolar Formula2
Bipolar Unipolar Formula3
Bipolar Bipolar Formula4

Example Applications

PDu100B_Ex_Application

Output Current

The maximum RMS and average DC output current for each voltage range is listed below. The average DC current is the average current flowing in either the positive or negative direction. For a sine wave, the average DC current is related to the RMS current by

Formula5

Voltage RangeRMS CurrentAverage Current
60 V 89 mA 40 mA
70 V 67 mA 30 mA
90 V 60 mA 18 mA
100 V 33 mA 15 mA

For periods less than 100 us, output currents of approximately 100 mA are possible. This is useful for achieving small, high-speed step changes in the output voltage.

Power Bandwidth

UNLOADED POWER BANDWIDTH: The output slew-rate of the PDu100B is 1 V/us. Therefore, the maximum frequency sine-wave is:

PDu100B_Unloaded_fmax

The UNLOADED power bandwidth for each voltage range is listed below:

Voltage RangeUnloaded Power Bandwidth
60 V 5.3 kHz
70 V 4.5 kHz
90 V 3.5 kHz
100 V 3.2 kHz

POWER BANDWIDTH WITH A CAPACITIVE LOAD: With a capacitive load connected, the power bandwidth is limited by the maximum output current.

PDu100B_Loaded_fmax

For a sine wave, the power bandwidth for a UNIPOLAR CAPACITIVE LOAD is listed below.

Load (uF)60V70V90V100V
0.01 5300 4500 3500 3200
0.03 5300 4500 2100 1500
0.1 2100 1300 630 470
0.3 700 450 210 150
1 210 130 63 47
3 70 45 21 15
10 21 13 6.4 4.8
30 7.1 4.5 2.1 1.6

For a BIPOLAR CAPACITIVE LOAD, the power bandwidth is halved since the voltage range is doubled.

In the following figures, the maximum peak-to-peakvoltage is plotted against frequency for a range of capacitive loads.

PDu100B_60V_Bandwidth

PDu100B_90V_Bandwidth

PDu100B_100V_Bandwidth

Enable / Shutdown

The Enable pin can be pulled low to disable the amplifier and reduce the quiescent current to 1 mA. It can be driven by a logic output or an open collector output. The recovery time after a shut-down is 2 ms.

Overload Protection

The PDu100B is protected against over-current and thermal overload. If the temperature exceeds 150 degrees C, the amplifier will be disabled until the temperature reduces.

Dimensions

The lateral dimensions are shown in the first figure. The mounting holes are designed for an M2.5 threaded spacer. The left elevation of the standard and PCB mounting version (PDu100B-PCB) are shown in the second figure.

pdu100b dims lg

pdu100b dims b lg

More Information

101 Innovation Blvd. Suite 308
State College, PA 16803, USA
Ph: (814)-861-5688
Fax: (814)-861-1418
contact@mmech.com
MMechLogosm