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PiezoDrive TD250 V8, Manual And Specifications

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PiezoDrive TD250 V8 Manual And Specifications Download Page 16

 

TD250 V8 Manual 

16 

Rev 2, 31-09-2020 

16

 

Bridged Load Configuration 

To obtain an output voltage range of +/-500V, the TD250-INV can used with a bridged load, as 
illustrated below. Note that the negative side of the load is now driven and cannot be connected to 
ground. The voltage across the bridged load is 

𝑉

𝐿𝑜𝑎𝑑

= 𝑉

𝑖𝑛

× 50

 

where 

𝑉

𝑖𝑛

 is the voltage applied to inputs 1, 3, or 5 and has a maximum value of +/-10 V.  

In the bridged configuration, the power bandwidth can be assessed by using the full peak-to-peak 
load voltage in the calculator. 

 

Figure 12. Bridged load configuration for obt/-500V. 

 

17

 

Warranty 

The TD250 is guaranteed for 12 months. The warranty does not cover damage due to misuse.  

 

 

 

25

 

Out1

 

In1

 

-25

 

Out2

 

25

 

In3

 

-25

 

25

 

In5

 

-25

 

TD250-INV

 

Out3

 

Out4

 

Out5

 

Out6

 

Load 1

 

Load 2

 

Load 3

 

Summary of Contents for TD250 V8

Page 1: ...TD250 V8 Manual 1 Rev 2 31 09 2020 TD250 V8 Six Channel 250V Amplifier Manual and Specifications ...

Page 2: ...ng and Earthing 7 9 Breakout 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 ...

Page 3: ...reakout 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...

Page 4: ...put 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 4 Delivery Contents TD250 amplifier Two breakout boxes with BNC connectors and plug in screw terminals Two 90cm DSUB9 cables Male Male...

Page 5: ...rting 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 ...

Page 6: ...ts 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 b...

Page 7: ...suits a 4 pin DIN male plug 8 Grounding 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...

Page 8: ...000G 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 Grounde...

Page 9: ...hat 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 plotte...

Page 10: ...than 10 nF For capacitive loads larger than 100 nF the 3dB bandwidth is approximately 𝑓 3𝑑𝐵 1 628 𝐶 where 𝐶 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 ...

Page 11: ...rise from the power supply circuit The amplitude of these narrowband components are significantly smaller than the white noise as observed in the time domain plots in Section 13 3 Due to the extremely low noise of the TD250 ground loops between the TD250 and driving instruments should be minimized A ground loop effectively creates a large single turn coil where any stray magnetic fields will induc...

Page 12: ...uV 5 3 kHz 100 nF 61 uV 1 6 kHz 300 nF 37 uV 5 3 kHz 1 uF 22 uV 1 6 kHz 3 uF 13 uV 530 Hz 10 uF 8 uV 160 Hz Table 3 Typical output voltage noise and bandwidth versus load capacitance 13 3 Typical Noise Waveforms An example of typical output voltage noise waveforms is plotted in Figure 9 for a range of load capacitances All cases share the same noise density but the reduced bandwidth with larger ca...

Page 13: ... mA DC or 28mA RMS None distorted waveform Total current The internal high voltage supply is limited to a total current limit of 60 mA average and 300 mA peak If this is exceeded the supply voltage will be reduced Status signal drops below 1V and front panel LED glows red Temperature If the heatsink temperature exceeds 70 C the high voltage supply will be disabled until the temperature reduces Sta...

Page 14: ...Δ𝑥 𝑉 𝑥 2 2𝑑31𝐿2 𝜋𝐷ℎ Δ𝑦 𝑉 𝑦 2 2𝑑31𝐿2 𝜋𝐷ℎ where Δ𝑥 and Δ𝑦 are the 𝑥 and 𝑦 axis deflection 𝑑31 is the piezoelectric strain constant 𝐿 is the length of the tube 𝐷 is the outside diameter ℎ is the tube thickness and 𝑉 𝑥 and 𝑉 𝑦 are the electrode voltages which are applied oppositely to either side of the tube The vertical elongation due to a voltage 𝑉 applied on all four quadrants is Δ𝐿 𝑉 𝑑31𝐿 ℎ The di...

Page 15: ...al which is usually five times the negative electric field strength Care must be taken not to apply positive voltages to the internal electrode since this can lead to depolarisation For example when using a non inverting channel the input is enforced to be negative as shown in Figure 11 Alternatively an inverting channel can be used and the input is enforced to be positive Figure 11 Driving piezoe...

Page 16: ...bridged load is 𝑉𝐿𝑜𝑎𝑑 𝑉𝑖𝑛 50 where 𝑉𝑖𝑛 is the voltage applied to inputs 1 3 or 5 and has a maximum value of 10 V In the bridged configuration the power bandwidth can be assessed by using the full peak to peak load voltage in the calculator Figure 12 Bridged load configuration for obtaining 500V 17 Warranty The TD250 is guaranteed for 12 months The warranty does not cover damage due to misuse 25 Ou...

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