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The A-301 Piezo Driver/Piezo Amplifier is a high Voltage, high speed Bi-polar Piezo Driver / Linear Amplifier for applications where low cost amplifier is needed.
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It was designed as a Linear Amplifier / Driver for PIEZO Electric Actuators (also known as "Piezo Amplifier"), stacks, piezo sheets, bimorph elements and other devices. It may be also used as a general purpose High Voltage amplifier for Medical applications (for example, as electrode driver for Neurology).
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The Piezo Driver / Piezo Amplifier is based on a high voltage, MOSFET amplifier which is capable of driving up to ±175V (350V ptp).
The current capacity of the A-301 is 60 mA (100 mA peak)
The current capacity of the A-301 HS is 100mA (150mA peak).
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The A-301 bandwidth is 30 KHz. while the A-301 HS can go up to 200 KHz. The slew rate of the A-301 is 30V/uSec. compared to 250V/uSec for the A-301HS.
By connecting 2 amplifiers in series, the output voltage may be doubled to 700Vptp.
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The amplifier section is very stable and has a low noise output and a very low electrical noise - Compare Our Specifications!
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Features:
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Low cost alternative for small experiments. Very Low Electrical Noise Low Distortion High Slew rate-up to 400 Volt/microsecond Input protection-High Voltage, On/Off Output protection - Short-circuit, Power loss, Impedance
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Specifications:
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Maximum Input Voltage
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± 10 V
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Maximum Output Voltage
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± 175 V (350Vptp)
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Maximum Current
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± 60 mA for A-301, +/-100mA for A-301HS
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Bandwidth
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Into 1 K resistive load.
A-301:DC - 30 kHz, A-301HS-DC-200KHz
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Output Power
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16 Watt maximum
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DC Gain
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20
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Coupling
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Input & Output: Direct DC Coupling
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DC Offset
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Adjustable to ± 8 Volts + On/Off Switch
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Input Impedance
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10 K
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Slew Rate
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A-301: 30V/ µSec, A-301HS:250V/µSec
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Output Noise
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4 mV PTP max. (0.8 mV RMS max.)
(input shorted, 30 KHz. BW)
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Variable Gain Option
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0-10X or 0 - 20X or 0-40X available.
Please consult the factory regarding that option.
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Dimensions
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H= 90mm W=134mm L=235mm
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AC Input
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Line Input Voltage
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110/120 V, 60 Hz and 220/230 V , 50 Hz
(Switchable by user)
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Line Input Current
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0.5 A peak
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Applications:
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2 amplifiers can be connected in series or in parallel in order to double the Output Voltage or Output Current.
Series connection (+/- 350V into a floating load = 700V ptp).
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Please note that both amplifiers must be floating (i.e. be careful not to ground them via an oscilloscope etc.)
It is also possible to double or tripple the output voltage by using a special transformer. Using a transformer is possible only at high frequency (over 10 KHz.) and it requires more components to be added for balancing and proper termination of the load.
Parallel connection is done by adding resistors at the input and at the output. Please consult the factory for parallel connection.
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Calculating the estimated current needed to drive your load:
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In order to purchase the right amplifier to drive your load, you must calculate the peak current needed.
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For Capacitive load:
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Ipeak(A) = 2 p F C Vpeak (for a Sine Wave)
Ipeak(A) = 4 F C Vpeak (for a triangular wave)
Ipeak(A) = C dV / dt (for a square wave or sharp rise time)
F=Maximum frequency (Hz.)
p=3.1415927 C=Capacitance in Farads
Vpeak=Maximum Voltage you need to drive your Load.
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For Resistive Load:
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I = Vpeak/R
where R is the resistance of your load in Ohms.
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The current, Voltage and Frequency must be less or equal to the amplifier's specifications.
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This amplifier is NOT SUITABLE for driving pure inductive loads (i.e. speakers, solenoids, electromagnets etc.)
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You must connect your load with thick wires to minimize inductance (like speaker wires). Coaxial cable is not recommended for cables over 2m (6.5 Ft.) because the capacitance of the cable (15-50 pF/Ft) will load your amplifier at high frequencies.
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Example:
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The active impedance of a capacitive load is given by the equation: Z=1/(2*Pi*F*C) where Pi=3.1415, C in Farads, F in Hz. The user must check that under the peak operation Voltage, at maximum frequency, the current will not exceed 200mA (0.2A).
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Example:
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Operating Voltage is +/-150V, Maximum Frequency=10KHz. Load is 10nF.
Z=1/(2*3.1415*10,000*10EE-9) =1592 Ohms.
150[V]/1592[Ohm] =94[mA] ===>The amplifier will drive that load at an amplitude of 150V (300V ptp).
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