PiezoDrive PX200 User manual

PX200 V2 Manual 1 Rev 1.1, Released, 15-01-2018
PX200 –Power Amplifier
Version 2.0
Manual and Specifications

PX200 V2 Manual 2 Rev 1.1, Released, 15-01-2018
Contents
1Introduction ...............................................................................................................................................3
2Warnings / Notes .......................................................................................................................................3
3Specifications .............................................................................................................................................4
4Output Voltage Range................................................................................................................................5
5Output Current...........................................................................................................................................5
6Pulse Current Option .................................................................................................................................6
7Power Bandwidth.......................................................................................................................................7
8Small Signal Bandwidth..............................................................................................................................9
9Noise ........................................................................................................................................................10
10 Front Panel...............................................................................................................................................11
11 Amplifier Configuration ...........................................................................................................................12
12 Bridged Mode ..........................................................................................................................................13
13 Overload and Shutdown ..........................................................................................................................14
14 Front Panel Connectors ...........................................................................................................................15
14.1 HV Output......................................................................................................................................16
14.2 LEMO OB Cable Assembly .............................................................................................................17
15 Enclosure..................................................................................................................................................18
16 Warranty ..................................................................................................................................................18

PX200 V2 Manual 3 Rev 1.1, Released, 15-01-2018
1Introduction
The PX200 is a low-noise voltage amplifier designed to drive capacitive and other loads from DC to
hundreds of kHz. The output voltage range can be unipolar, bipolar, or asymmetric with a peak-to-peak
value of between 50V and 200V. Two amplifiers can be connected in bridge-mode to provide 200V or
+400V. The amplifier will deliver up to 4 Amps peak with a sinusoidal output, or up to 8 Amps peak for
pulse applications.
The PX200 is compact, lightweight, and can be powered from any mains supply. The output connectors
include LEMO 00, LEMO 0B, BNC (adaptor included), and plug-in screw terminals, so many commercially
available piezoelectric actuators can be directly connected. The PX200 is suited to a wide range of
applications including: electro-optics, ultrasonics, vibration control, nanopositioning, and piezoelectric
motors
2Warnings / Notes
This device produces hazardous potentials and requires suitably qualified
personnel with an observer trained in first-aid training. Do not operate the
device when there are exposed conductors.

PX200 V2 Manual 4 Rev 1.1, Released, 15-01-2018
3Specifications
Electrical Specifications
Output Voltage Range
100 Vp-p
150 Vp-p
200 Vp-p
RMS Current
3.1 A
2.0 A
1.5 A
Pulse Current
8.0 A
8.0 A
8.0 A
Power Bandwidth
110 kHz
93 kHz
55 kHz
Gain
20 V/V
Slew Rate
35 V/us
Signal Bandwidth
390 kHz
Max Power
140 W Dissipation
Load
Any
Noise
150 uV RMS (10uF Load, 0.03 Hz to 1 MHz)
Protection
Continuous short-circuit, thermal
Voltage Monitor
1/20 V/V (BNC)
Current Monitor
1 V/A (BNC)
Analog Input
Signal input (BNC, Zin = 48.7k)
Output Connectors
LEMO 0B, LEMO 00, Screw Terminals, BNC
Power Supply
90 Vac to 250 Vac
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)

PX200 V2 Manual 5 Rev 1.1, Released, 15-01-2018
4Output Voltage Range
The desired output voltage range is specified when ordering. The default output range is
0V to +200V (PX200-V0,200). The available voltage ranges and associated current limits are listed below.
Voltage Range
RMS Current
Peak Current
Order Code
0 to +200
1.5 A
2 A
PX200-V0,200
0 to +150
2.0 A
4 A
PX200-V0,150
0 to +100
3.1 A
4 A
PX200-V0,100
0 to +50
3.1 A
8 A
PX200-V0,50
-50 to +50
3.1 A
4 A
PX200-V50,50
-50 to +100
2.0 A
4 A
PX200-V50,100
-50 to +150
1.5 A
2 A
PX200-V50,150
-100 to +50
2.0 A
4 A
PX200-V100,50
-100 to +100
1.5 A
2 A
PX200-V100,100
-100 to 0
3.1 A
4 A
PX200-V100,0
-150 to 0
2.0 A
4 A
PX200-V150,0
-200V to 0
1.5 A
2 A
PX200-V200,0
Table 1. Voltage range configurations
5Output Current
The PX200 has a peak and average current limits as described in Table 1. The RMS current limit defines the
maximum frequency that is achievable with a capacitive load. This topic is discussed in “Power Bandwidth”.
During short-circuit the output current is limited to the rated maximum. The peak current can be drawn for
up to five milliseconds before the output is disabled for three seconds. The average current limit has a
time-constant of ten milliseconds and is reset 50 milliseconds after a previous current pulse. This
behaviour is described in “Overload and Shutdown”

PX200 V2 Manual 6 Rev 1.1, Released, 15-01-2018
6Pulse Current Option
For applications that require a high peak current, the peak current limit can be increased to 8 Amps by
appending the order code with “-PULSE”, e.g. “PX200-V0,200-PULSE”. In this configuration, the average
current limit remains the same; however, the peak current limit is increased to 8 Amps and the maximum
pulse duration is reduced to the time listed in Table 2. The voltage span is the peak-to-peak output voltage
range, e.g. the voltage span for the -50V to +150V range is 200V .
Voltage Span
Pulse Current
Pulse Time
200 V
8 A
150 us
150 V
8 A
200 us
100 V
8 A
300 us
50 V
8 A
300 us
Table 2. Maximum peak current duration in the pulse configuration
For a current pulse that is less than the peak current limit, the maximum pulse duration is described in
Figure 1.
Figure 1. Maximum pulse duration versus peak current and voltage span

PX200 V2 Manual 7 Rev 1.1, Released, 15-01-2018
7Power Bandwidth
Launch Online Power Bandwidth Calculator
The online power bandwidth calculator takes into account the current limit, slew-rate,
output impedance, and small-signal bandwidth.
With a capacitive load, the RMS current for a sine-wave is
 


where 
 is the peak-to-peak output voltage, is the load capacitance and is the frequency. Therefore,
the maximum frequency for a given RMS current limit 󰇛󰇜capacitance, and voltage is

 

 
The above equation is also true for any periodic waveform, including triangle waves and square waves. This
property arises since the amplifier detects average current, which not affected by the waveform shape.
The ‘power bandwidth’ is the maximum frequency at full output voltage. When the amplifier output is
open-circuit, the power bandwidth is limited by the slew-rate; however, with a capacitive load, the
maximum frequency is limited by the RMS current and load capacitance. The power bandwidth for a range
of capacitive loads is listed below.
Load Capacitance
50V Range
100V Range
150V Range
200V Range
10 nF
222 kHz
111 kHz
74 kHz
55 kHz
30 nF
222 kHz
111 kHz
74 kHz
55 kHz
100 nF
222 kHz
111 kHz
62 kHz
35 kHz
300 nF
93 kHz
46 kHz
20 kHz
11 kHz
1 uF
28 kHz
14 kHz
6.2 kHz
3.5 kHz
3 uF
9.3 kHz
4.6 kHz
2.0 kHz
1.1 kHz
10 uF
2.8 kHz
1.4 kHz
60 Hz
350 Hz
30 uF
930 Hz
460 Hz
200 Hz
117 Hz
Table 3. Power bandwidth versus load capacitance and output voltage span
In the above table, the frequencies limited by slew-rate are shaded grey. The slew-rate is approximately
35 V/uS which implies a maximum frequency of
  


In the following figures, the maximum peak-to-peak voltage is plotted against frequency and capacitance.

PX200 V2 Manual 8 Rev 1.1, Released, 15-01-2018
200V Range
150V Range
100V and 50V
Range
Ra
Figure 2. Maximum peak-to-peak voltage versus frequency and load capacitance

PX200 V2 Manual 9 Rev 1.1, Released, 15-01-2018
8Small Signal Bandwidth
The small-signal frequency response and -3 dB bandwidth is described in Figure 3 and Table 4.
Figure 3. Small signal frequency response for a range of load capacitances.
Load Capacitance
Bandwidth
10 nF
393 kHz
30 nF
431 kHz
100 nF
367 kHz
300 nF
208 kHz
1 uF
88 kHz
3 uF
30 kHz
10 uF
9.3 kHz
30 uF
3.7 kHz
110 uF
1.3 kHz
Table 4. Small signal bandwidth versus load capacitance (-3dB)
103104105106
-20
-10
0
10
20
30
Magnitude (dB)
103104105106
-250
-200
-150
-100
-50
0
50
100
Phase (deg.)
Frequency (Hz)
300 nF
1 uF
3 uF
10 uF
30 uF
100 nF
30 nF
10 nF

PX200 V2 Manual 10 Rev 1.1, Released, 15-01-2018
9Noise
The output voltage noise contains a low frequency component (0.03 Hz to 20 Hz) that is independent of
the load capacitance; and a high frequency (20 Hz to 1 MHz) component that is approximately inversely
proportional to the load capacitance.
The noise is measured with an SR560 low-noise amplifier (Gain = 1000), oscilloscope, and Agilent 34461A
Voltmeter. The low-frequency noise is plotted in Figure 4. The RMS value is 120 uV with a peak-to-peak
voltage of 600 uV.
Figure 4. Low frequency noise from 0.03 Hz to 20 Hz
The high frequency noise (20 Hz to 1 MHz) is listed in the table below versus load capacitance. The total
RMS noise from 0.03 Hz to 1 MHz is found by summing the RMS values, that is   
  . For a load
capacitance of less than 1 uF, the noise is primarily broadband thermal noise; however, for a capacitance
of greater than 1 uF, the noise is primarily due to low-frequency noise.
Load Cap.
Bandwidth
HF Noise RMS
Total Noise RMS
10 nF
393 kHz
530 uV
543 uV
30 nF
431 kHz
586 uV
598 uV
100 nF
367 kHz
689 uV
699 uV
300 nF
208 kHz
452 uV
468 uV
1 uF
88 kHz
261 uV
287 uV
3 uF
30 kHz
106 uV
160 uV
10 uF
9.3 kHz
56 uV
132 uV
30 uF
3.7 kHz
52 uV
131 uV
100 uF
1.3 kHz
47 uV
129 uV
Table 5. RMS noise versus load capacitance (0.03 Hz to 1 MHz)