PDm200 V9High Performance Piezo Driver

Specifications
Power Supply
Max Unipolar Output-30V to 200 V

Max Bipolar Output± 200 V (±400 V bridge mode)

Peak Output Current

300 mARMS Output Current

120 mA (±100 V Output)

Power Bandwidth

63 kHz (100 Vp-p)

Signal Bandwidth

200 kHz

Slew Rate

20 V/us

Dimensions

The PDm200 is a high-performance power supply
and linear amplifier module for driving piezoelectric
actuators. The output voltage range can beswitched between bipolar or unipolar modes with arange of 100V, 150V, or 200V. Up to ±400V can beachieved in the bridged configuration. In theunipolar mode, the negative output range is fixed at-30V for use with stack actuators.
The PDm200 can drive stack actuators; standard
piezoelectric actuators; two wire benders; andthree-wire piezoelectric benders requiring a bias
voltage.

Noise

Stack Actuators

60V to 200V

Plates and Tubes

up to ± 200V

Two Wire Benders

up to ± 200V

50 g

Gain

20 V/V

Input Impedance

200 𝑘Ω

Input Offset±10 mV

Overload

Environment

Quiescent Current

Any
Thermal and current
overload protection<1 mV RMS (1uF Load)0 to 60C (32 to 140F)
Non-condensing humidity
100 mA (7.5 mA in Shutdown)
71 mm

en
VingndV+V-

0 to 200V with 200V bias
Three Wire Benders± 100V with ± 100V bias

The PDm200 is suited to a wide range ofapplications including: Electro-optics, ultrasound,vibration control, nanopositioning systems, andpiezoelectric motors.

en
Vin
gnd
V+
V-The PDm200 is protected against current overload
and excessive temperature. It can be mounted to abase with four M2.5 screws or. The PCB mounting
version is supplied with headers for direct mounting
onto a host motherboard.
PDm200 V9 Datasheet

71 x 38 mm

WeightLoadCompatible Actuators± 12 V to +34 V

V2
V1gnd

PDm200Inputs
EnableInput Signal
GroundPositive Supply
Negative Supply

38mm

Vb

V2
V1
gnd
Vb

Outputs
Low Noise Output
High Speed Output
GroundBias Voltage

Figure 1. Connection diagram

1

Modified 16/01/2021

OperationOutput

The system block diagram is illustrated in Figure 2. Apower converter generates a unipolar or bipolar supply.
The output voltage range is controlled by the voltage
selector jumpers.
The amplifier has a gain of 20 and an input voltage rangeof ±10 V. The load is connected directly to the highspeed output (V1) or through a filter (V2) which reduces
the noise and bandwidth. In most applications, the V2
output is recommended.

SupplyV+V-200 V

Bias
Voltage

Filter

DCB
A

DCB

DC
B
AMax

Min

200 V
150 V
100 V

-200 V-150 V-100 V

Power Supply Voltage±12 to ±15 to+24 V +30 V±14 V±17 V
to 30V to 34
D,H
D,H
D,HC,GD,HC,GB,FA,FB,FA,FTable 2. Bipolar jumper configuration

The PDm200 can also be used in lower voltage
applications; however, the output current may bereduced. The corresponding low-voltage jumper
positions are listed below.

+Load

Figure 2. PDm200 Block Diagram

Output Voltage
MaxMin80 V-30 V
80 V
0V
60 V
-60 V

Configuration
The PDm200 is configurable to suit a wide range ofpower supply and output voltage ranges. The output
voltage range is selected by two jumpers marked L1 andL2, as shown below. Each jumper has four possible
positions marked by the letters A to D and E to H.

Power Supply Voltage±12 to ±14 V+12 V to 15 V
A,ED,ED,H

Table 3. Low voltage jumper configurations

Output Current
The peak output current is approximately 300 mA andthe maximum average output current is approximately

In the unipolar output mode, the negative output range
is fixed at -30 V and the jumper L2 is always in the ‘E’position. The correct position for the L1 jumper is listed
below for different power supply voltages.

𝐼𝑎𝑣 =0.45 × 𝑉𝑠− 0.01 ,𝑉𝑜𝑢𝑡

where 𝑉𝑠 is the differential supply voltage e.g. 30V, and𝑉𝑜𝑢𝑡 is the differential output voltage range e.g. 400 V.
The average DC current is the average current flowing ineither the positive or negative direction. For a sine wave,
the average current is related to RMS current by√2
𝐼𝑎𝑣 =𝐼.
𝜋 𝑟𝑚𝑠
The PDm200 calculator can be used to estimate themaximum input and output current for a given supply
voltage and output voltage range. Some common values
are tabulated below.

ABCDHGFEFigure 3. Jumper Locations

PDm200 V9 Datasheet

DCB

Output Voltage

VbV2HV-L2-30 V-30 V-30 V-30 V±15 to +24V* to +30V* to±1730
34

In bipolar output mode, the correct positions for the L1and L2 jumpers are listed in below in Table 2.

V120L1200 V
150 V
120 V
100 V

±12 to±14

In the ±200 V mode, the low-noise output (V2) isrecommended. See the section on “Stability” for moredetails.

HV+VinMin*With a single supply, the negative output voltage range
is reduced from -30 V to -20 V.

VoltageSelector

BoostConverterMax

Table 1. Unipolar jumper configuration (L2 = E)

A variable bias supply is also available for piezoelectricbender applications. The default bias voltage is 200 V butlower voltages can be achieved by adding a resistor.

EnablePower Supply Voltage

2Modified 16/01/2021

Voltage Range-30 V, +150 V-30 V, +200 V-100 V, +100 V-200 V, +200 V

RMS Current
144 mA108 mA
128 mA
53 mA

Example Applications

Average Current
65 mA
49 mA
58 mA24 mA-30V to 150VInput-1.5V to 7.5V+12V-12V

Table 4. Average output current for ±15V supplyVing
V+
V-+

V2
V1g
Vb

150 V Piezo stack driver. Jumpers in D and E positions.

Supply Current
The maximum supply current is 0.5 A at full load. For apartial load, the supply current isInput±10V+16V-16V

𝑃𝑖𝑛𝐼𝑖𝑛 =,𝑉𝑠

Ving
V+
V-±200 V

V2
V1g
Vb+±200 V Piezo driver. Jumpers in D and H positions.

where the required input power is𝑃𝑖𝑛 = 1.33 𝑉𝑜𝑢𝑡 (0.01 + 𝐼𝑎𝑣 ) ,where 𝑉𝑜𝑢𝑡 is the differential output voltage range and𝐼𝑎𝑣 is the average output current.

Input
0V - 10V
30VApplication Notes

Ving
V+V-0V to+ 200V

V2V1gVb

200V+ to 0V
200V

The amplifier input 𝑉𝑖𝑛 should not be left floating as it
will drift towards a supply rail. However, in applications
where the input may float, a 1 kΩ resistor (1206 size) canbe mounted at the location “Rin”, the input impedanceis now 1 kΩ.

200 V Three-wire bender driver with bias.
Jumpers in D and E positions.

Input±5V
24V

Ving
V+
V-V2V1g
Vb±100V+±100 V Piezo driver. Jumpers in D and E positions.

PDm200 V9 Datasheet

3Modified 16/01/2021

Heat Dissipation

120

30uF 10uF 3uF 1uF 300n 100n

At full power, the worst-case heat dissipation isapproximately 15 W which is dissipated by the heatsinkand fan.

Peak to Peak Voltage (V)100

During normal operation the heat dissipation can be
estimated by multiplying the required supply current andthe differential supply voltage.
When the heat dissipation is less than 5W, the module
fan can be removed. A high-performance passive
heatsink is also available (PDm200-Fanless).

400010210Frequency (Hz)34101030uF 10uF 3uF 1uF 300n 100n
Peak to Peak Voltage (V)200Power Bandwidth
The maximum frequency with a capacitive load is mosteasily determined from the online calculator athttps://www.piezodrive.com/modules/pdm200/.

150

10050

With a capacitive load, the power bandwidth is limitedby the average output current. The maximum frequency
sine wave is0010𝐼𝑎𝑣𝑉𝐿(𝑝−𝑝) (𝐶𝐿 + 3.9nF)

121010Frequency (Hz)341010Figure 5. 200 V range power bandwidth

The power bandwidth for a range of load capacitancevalues is listed below.

50030uF 10uF 3uF 1uF
Peak to Peak Voltage (V)

100 V
67625
27729
9047
3093
936
313
94.0
31.3

110Figure 4. 100 V range power bandwidthWith the passive cooling option, the thermal impedanceof the PDm200 from junction to ambient isapproximately 10 ℃/W. An air-flow of 100 LFM orgreater is required when more than 5 W is dissipatedcontinuously. The PDm200 will shut down when theheat-sink reaches 70 ℃

Load(uF)
0.01
0.03
0.1
0.3
1310306020Note that the power dissipation in the +/-200V output
range is always greater then 5 W so forced air cooling isa requirement.

𝑓𝑝𝑤𝑟 =80

Peak to Peak Voltage
200 V
300 V
400 V
17626
8393
4317
7227
3441
1770
2358
1123
577
806
384
197
244
116
60
82
39
20
24.5
11.7
6.0
8.2
3.9
2.0300n 100n

400

300

200

100

0010

1102

10Frequency (Hz)310Table 5. Power bandwidth (Hz) for a capacitive load

Figure 6. 400 V range power bandwidth

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

The power bandwidth is primarily related to the average
current limit as described above. However, when
operating at full range, e.g. ±200 V, with the minimum
supply voltage, e.g. ±15 V, the power supply droop candistort the top of a signal. This effect can be reduced byincreasing the supply voltage.

PDm200 V9 Datasheet

4

Modified 16/01/2021

Signal Bandwidth

when significant current is drawn from the output due toripple from the boost converter.

With a load capacitance greater than 100 nF, the small
signal bandwidth is*For load capacitances of 100nF or smaller, the lownoise output (V2) is recommended.

1
𝑓𝑏𝑤 =.
63 𝐶𝐿
With a load capacitance less than 100 nF, the small signal
bandwidth is approximately 200 kHz.

Stability
In the ±200 V range, oscillation can occur with someload capacitances when the output voltage is very close
to the negative rail (-190V). This problem can beeliminated by using the low-noise output (V2).
Alternatively, a 330pF 25V 0603 capacitor can besoldered on top of R14 which reduces the bandwidth toapproximately 3 kHz and will avoid oscillation. Thiscapacitor can be installed before delivery if necessary.

The bandwidth of the low noise output (V2) isapproximately 5% of the high speed output, that is,
𝑓𝑏𝑤 =1.
1445 𝐶𝐿The small signal bandwidth for a range of capacitive
loads is listed in Table 6.
LoadCapacitance
10 nF
30 nF
100 nF
300 nF
1 uF
3 uF
10 uF
30 uF

High Speed
Bandwidth
200 kHz200 kHz
158 kHz52 kHz
15 kHz5.2 kHz
1.5 kHz530 HzLow Noise
Bandwidth
49 kHz
20 kHz6.6 kHz
2.3 kHz690 Hz230 Hz69 Hz
23 Hz

Bias Output
The bias output (Vb) provides a fixed +200 V output fordriving 200 V three-wire actuators like benders that
require a bias voltage. Actuators that require a ±100 Vbias can also be driven in this configuration as this iselectrically identical.
Lower bias voltages can also be achieved by adding a1206 resistor to the location “Rb”. The resulting bias
voltage isTable 6. Small signal bandwidth

𝑅𝑏1+𝑅𝑏𝑉𝑏 = 50.0255
Where 𝑅𝑏 is specified in MΩ. For example, if 𝑅𝑏 is
2.7 MΩ, 𝑉𝑏 = 148 V.
0.0255 +Noise
The output of the PDm200 contains a small amount ofswitching noise from the boost converter and random
noise from the high-voltage amplifier. With a ±15 V
supply and ±100 V output range, the RMS noise is listedin Table 7.
LoadCap
10 nF
100 nF
1 uF
10 uFHigh SpeedOutput
4.1 mV*
1.3 mV*
1.3 mV
0.42 mVThe bias output can sink or source an average current of
10 mA. However, there is no protection so care must betaken not to exceed the current limit. If more than 10 mA
is required, the primary output of a second PDm200 canbe used to generate the bias.

Low Noise
Output1 mV*
0.3 mV*
0.3 mV
0.1 mVInput
0V - 10V
30V

Ving
V+
V-V2
V1g
Vb+0V to200V200V+ to 0V200V

Table 7. RMS noise

200 V Three-wire bender driver with bias, using D and E jumpers.

For applications requiring extremely low noise, anoutput resistor resistance can be used to reduce theeffective bandwidth, which is approximately
𝑓𝑏𝑤 =Enable / Shutdown

12𝜋𝑅𝐶𝐿The Enable pin is a high impedance signal that floats 5V
above the negative supply rail. It can be pulled to thenegative supply rail to disable the amplifier. The voltage
on this pin can also be monitored to check the status ofthe amplifier. Any monitoring circuit should have an
input impedance of greater than 200 𝑘Ω. A high level
voltage on the enable pin indicates a normal status whilea low level indicates a thermal shutdown.

where 𝐶𝐿 is the load capacitance. The recommended
bandwidth is low-noise applications is 100 Hz.
The noise measurements were performed with the input
shorted and the fan disabled. The noise may increase
PDm200 V9 Datasheet

5

Modified 16/01/2021

Safety

The recommended enable circuits for unipolar andbipolar supplies are shown below. Any small signaltransistors are suitable, e.g. BC817 and BC807.

This device produces hazardous
potentials and should be used bysuitably qualified personnel. Do
not operate the device when
there are exposed conductors.
Parts of the circuit will store
charge so precautions must also be taken when thedevice is not powered

Dimensions
The mounting posts accept an M2.5 screw. For the PCB
mounting version (PDm200-PCB), a schematic andfootprint library is available for Altium Designer, contact
info@piezodrive.com to receive the file.

Figure 7. Enable circuit for unipolar supply (V- is grounded)

Warranty
PDm200 devices are tested prior to delivery. There is nowarranty period.

Contact / Support
info@piezodrive.com
Figure 8. Enable circuit for bipolar supply

Revision History

Overload Protection

Date
16/01/21

The PDm200 is protected against over-current andthermal overload. If the PCB temperature exceeds 70 ℃
the amplifier will be disabled until the temperature
reduces.

Rev By Changes
R2 KB Temp range updated

Bridge Configuration
The output voltage range can be doubled by driving theload in a bridged configuration as shown below. Bothamplifiers should be configured for ±200V operation.
Input
±10V

4k7+16V-16V

VingV+
V-

V2
V1g
Vb+16V-16V

VingV+
V-V2
V1gVb+

4k7±400 V Piezo driver

The power bandwidth for this configuration can becalculated by considering only one amplifier anddoubling the effective capacitance.

PDm200 V9 Datasheet

6

Modified 16/01/2021

Figure 9. Dimensions (mm)PDm200 V9 Datasheet

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Modified 16/01/2021