PiezoDrive TD250 V8 User manual

TD250 V8 Manual 1 Rev 2, 31-09-2020
TD250 V8
Six Channel +/-250V Amplifier
Manual and Specifications

TD250 V8 Manual 2 Rev 2, 31-09-2020
Contents
1Introduction..................................................................................................................................... 3
2Warnings / Notes............................................................................................................................. 3
3Specifications................................................................................................................................... 4
4Delivery Contents ............................................................................................................................ 4
5Channel Configurations ................................................................................................................... 5
6Front Panel ...................................................................................................................................... 6
7Rear Panel........................................................................................................................................ 7
8Grounding and Earthing .................................................................................................................. 7
9Breakout Box ................................................................................................................................... 8
10 Power Bandwidth ......................................................................................................................... 9
11 Pulse Currents............................................................................................................................... 9
12 Small Signal Frequency Response ............................................................................................... 10
13 Noise........................................................................................................................................... 11
13.1 Noise Spectral Density ......................................................................................................... 11
13.2 RMS Noise............................................................................................................................ 12
13.3 Typical Noise Waveforms..................................................................................................... 12
13.4 Noise Test Conditions........................................................................................................... 13
14 Overload Protection.................................................................................................................... 13
14.1 Status Signal......................................................................................................................... 13
14.2 Disable Command ................................................................................................................ 13
15 Driving Piezoelectric Tubes......................................................................................................... 14
16 Bridged Load Configuration ........................................................................................................ 16
17 Warranty..................................................................................................................................... 16

TD250 V8 Manual 3 Rev 2, 31-09-2020
1Introduction
The TD250 is an ultra-low noise, six-channel voltage amplifier with +/-250V output range. The six
channels can be ordered as either independent (TD250-SGL), or as three channels with non-inverting
and inverting outputs (TD250-INV), which are ideal for driving piezoelectric tube scanners. The
inverting configuration can also be used to obtain +/-500V with a bridged load.
The TD250 can drive unlimited capacitive loads such as piezoelectric tubes, stack actuators, standard
piezoelectric actuators, and bender actuators. Applications include nanopositioning, microscopy,
electro-optics, and vibration control.
The input and output connectors are industry standard 9-Pin D-Sub connectors. The amplifier is
supplied with two 90cm DSUB cables and two breakout boxes that include BNC connectors and plug-
in screw-terminals. OEM and customized versions are also available.
The TD250 Version 8 provides a number of improvements over previous hardware:
The enclosure contains no fans and generates zero mechanical noise,
Increased output current from 22 to 28 mArms,
Improved noise performance, particularly at low-frequencies,
Remote status monitoring and remote shutdown.
Example applications include:
Compatible Actuators
Piezoelectric tubes
+/-250V
Piezoelectric plates
and other actuators
+/-250V with a grounded load, or
+/-500V in bridged configuration
Two wire benders
+/-250V with one electrode grounded (six actuators), or
+/-500V in bridged configuration (three actuators)
Three wire benders
+/-250V on each electrode (3 actuators), or
up to +/-250V on 5 actuators + HV Bias.
2Warnings / Notes
This device produces hazardous potentials and requires qualified personnel
and observation of mandatory safety protocols. Do not operate the device
with exposed conductors.

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3Specifications
Electrical Specifications
Output voltage range
+/-250 V Six Channels
RMS current
28 mA
Peak current
100 mA
Gain
25 V/V
Slew rate
20 V/us
Signal bandwidth
25 kHz
Power bandwidth
15 kHz
Noise
61 uVrms (100 nF Load)
Protection
Short-circuit, temperature, under-voltage
Input impedance
1 MOhm
Output impedance
100 Ohm
Input connector
9 Pin D-sub Female
Output connector
9 Pin D-sub Female
Power Supply
15V, 3A Minimum
Mechanical Specifications
Environment
0-40 C (32-104 F) Non-condensing humidity
Dimensions
216 x 108 x 48 mm (8.5 x 4.3 x 1.9 in)
Weight
1 kg (2.2 lb)
4Delivery Contents
TD250 amplifier
Two breakout boxes with BNC connectors and plug-in screw-terminals
Two 90cm DSUB9 cables, Male-Male, with straight-through wiring
Universal power supply 90 Vac to 250 Vac, 15V 3A output
IEC C13 power cable, suited to the shipping destination

TD250 V8 Manual 5 Rev 2, 31-09-2020
5Channel Configurations
The TD250 can be ordered with six independent channels (TD250-SGL) or three non-inverting and
inverting pairs for driving piezoelectric tubes and bridged loads (TD250-INV). The connection
diagrams are shown below.
Figure 1. TD250 Channel configurations
25
Out1
In1
25
Out2
In2
25
Out3
In3
25
Out4
In4
25
Out5
In5
25
Out6
In6
25
Out1
In1
-25
Out2
25
Out3
In3
-25
Out4
25
Out5
In5
-25
Out6
Independent Outputs
TD250-SGL
Non-Inverting and Inverting Outputs
TD250-INV

TD250 V8 Manual 6 Rev 2, 31-09-2020
6Front Panel
The input and output connectors are 9-pin DSUB receptacles. The recommended mating connectors
are 9-pin DSUB male cable plugs. The connector pins on the amplifier are listed below.
Figure 2. Front view of amplifier connector numbering
Connector Pin
Input Connector
Output Connector
1 to 6
Inputs 1 to 6
Outputs 1 to 6
7
Signal Ground
Signal Ground
8
Status
Signal Ground
9
Disable
Signal Ground
Connector shield
Chassis Earth
Chassis Earth
Table 1. Front panel D-sub connector pin-out
Input Signals
The standard input voltage is +/-10V and the absolute maximum input voltage is +/-20V. Use the
signal ground not chassis earth. The input impedance is 1 MOhm when the amplifier is powered on
and approximately 1.5 kOhm when the amplifier is off. For the inverting configuration (TD250-INV),
only inputs 1, 3 and 5 are active.
Disable Input
Applying a positive voltage of between 3V and 5V to the disable pin on the front panel connector will
turn off the amplifier. The input impedance is approximately 2 kOhm. The absolute maximum input
voltage is +/-10V.
Status Output
A +5V output (relative to signal ground) on the status pin indicates that the high-voltage power
supplies are both active and not effected by any overload or disable conditions. The output
impedance is 100 kOhm. The output voltage can be reduced to 3V by shunting the output to signal
ground with any 3V Zener diode.
Output Signals
The load should be connected between each output and signal ground. Do not operate the amplifier
with exposed conductors.
Status Indicator
Green indicates that the amplifier is on and the high-voltage power supply is active. Red indicates
that the amplifier is on but the high-voltage power supplies are less than 240V due to a fault
condition. A mixture of red and green indicates that the amplifier is on the verge of overload.
1
2
3
4
5
6
8
7
9

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7Rear Panel
The rear panel includes a chassis earth connector that can be used to improve shielding, particularly
when using an alternative power supply with an isolated output. This connector will accept a wire lug,
4mm plug, or stripped wire. The negative terminal of the power input connector is also connected to
the chassis. Since the negative output terminal of the included power supply is connected to earth,
the chassis is normally earthed.
The included power supply is Meanwell GST120A15-R7B. The power input connector is CUI PD-40S,
which suits a 4-pin DIN male plug,
8Grounding and Earthing
The chassis ground of the TD250 is electrically connected to the negative terminal of the power
supply inlet. The negative terminal of the included power supply (GST120A15-R7B) is internally
connected to earth, which earths the chassis of the TD250. The chassis can also be earthed by the lug
on the rear panel, which is required if an isolated AC power supply is used.
The input signals should be connected between an input pin (pin 1-6) and signal ground (pin 7). The
load should be connected between an output pin (pin 1-6) and signal ground (pin 7-9). The BNC
connector grounds are normally connected to chassis ground, and hence earth.
Figure 3. TD250 Chassis and signal ground configuration
Signal ground
AC-DC
Signal
Chassis ground
TD250

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9Breakout Box
The TD250 is supplied with two identical breakout boxes that simplify input and output connection
when using BNC cables or free wires. The header installed in the breakout box (Amphenol
OQ1032510000G) suits a 10-Way 3.81mm plug-in screw terminal (Amphenol TJ1031530000G) which
is also supplied (but not pictured below)
Each breakout box is connected to the amplifier with a 9-Pin male-male D-sub cable with one-to-one
(straight through) wiring.
Figure 4. Front and rear views of the breakout box
DSUB9 Connector Pin
BNC
Plug-in Screw Terminals
1 to 6
1 to 6
Outputs 1 to 6
7
BNC Shields
7
8
8
9
9
Grounded shield
10
Table 2. Breakout box connectivity

TD250 V8 Manual 9 Rev 2, 31-09-2020
10 Power Bandwidth
The power bandwidth is the maximum frequency sine wave that can be reproduced with a given
amplitude and load capacitance. An online tool is available for this purpose. The example screenshot
below shows that the maximum frequency is 650 Hz, with a 0.1 uF load and 200 Vpk-pk output.
Figure 5. Screenshot of online power bandwidth calculator (available here)
11 Pulse Currents
The peak current output of the TD250 is 100 mA. When reproducing step voltage changes in
capacitive loads, the peak current will remain above 85 mA for approximately 100 us. The relationship
between output current and duration is plotted in Figure 6.
Figure 6. Peak current duration for the TD250.

TD250 V8 Manual 10 Rev 2, 31-09-2020
12 Small Signal Frequency Response
The small signal bandwidth of the TD250 is approximately 25 kHz with a capacitive load less than
10 nF. For capacitive loads larger than 100 nF, the -3dB bandwidth is approximately

 

where is the load capacitance. The bandwidth for a range of capacitive loads is listed in Table 3. The
small signal frequency response is plotted for a range of load capacitances in Figure 7.
Figure 7. Small signal frequency response for a range of load capacitances