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13 Choosing the Voltage Range
The PDUS210 is available in voltage ranges from 17 Vrms to 282 Vrms, which suit load load
impedances ranging from 1.5 Ω to greater than 400 Ω. The optimal choice is determined by the
transducer impedance at resonance, and the choice of series or parallel resonance. If the load
impedance is unknown, or a range of load impedances are expected, the PDUS210-Flex configuration
is recommended with the transformer kit (TX210-Kit1), please refer to PDUS210-FLEX Specifications.
To determine the ideal voltage range, start by measuring the impedance of the transducer at the
series and parallel resonance. This can be performed with an impedance analyser or simply a signal
generator and oscilloscope. If possible, these tests should be performed at moderate power with
both minimum and maximum load conditions. A PDUS210 driver is ideal for performing this
measurement. Fill out the values in the table below:
Series Resonance
Parallel Resonance
13.1 Series Resonance
For operation at the series resonance, the most suitable amplifier has an optimal impedance which is
close to, or slightly greater than the fully loaded impedance. Since transducer impedance tends to
increase with applied power, an amplifier with a higher optimal impedance is recommended. If the
amplifier has a higher optimal impedance than the load, the current limit will be reached before the
voltage limit, and the maximum achievable output power is:
where ��
is the maximum driver current.
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13.2 Parallel Resonance
For operation at the parallel resonance, the most suitable amplifier has an optimal impedance which
is close to, or slightly less than the fully loaded impedance. Since transducer impedance tends to
reduce with applied power, an amplifier with a lower optimal impedance is recommended. If the
amplifier has a lower optimal impedance than the load, the voltage limit will be reached before the
current limit, and the maximum achievable output power is:
where ��
is the maximum driver voltage.
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13.3 Custom Voltage Range
Custom voltage ranges and impedance-matching network design is available on request.
PDUS210 V5 Manual
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Table 4. Operating impedance at resonance
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Fully Loaded
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2
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14
:
:
Modified 17/12/2022
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