Output Current; Power Bandwidth - PiezoDrive PD32 Manual And Specifications

7 Output Current

The peak output current is 150 mA per channel in the grounded load configuration or 75 mA per channel in
the floating load configuration. The maximum RMS current is 106 mA in the grounded configuration and
53 mA in the floating load configuration.
The maximum simultaneous output current from all channels is 3 Amps RMS.

8 Power Bandwidth

The nominal slew-rate of the PD32 in the grounded load configuration is 19 V/us. Therefore, the unloaded
maximum frequency sine-wave is
That is, the power bandwidth for a 120 Vp-p sine-wave is 50 kHz. In the floating load configuration, the
slew-rate is doubled to 38 V/us, therefore, the power bandwidth for a 240 Vp-p sine-wave is 50 kHz
With a capacitive load, the power bandwidth is limited by the output current. The maximum frequency
sine wave is
where ���� is the peak current limit, ����
��������
capacitance. The power bandwidth versus load capacitance is listed below.
Load Grounded Load Voltage (pk-pk)
Cap. 50
10 nF 95 kHz
30 nF 31 kHz
100 nF 9.5 kHz
300 nF 3.1 kHz
1 uF 950 Hz
3 uF 310 Hz
10 uF 96 Hz
30 uF 32 Hz
Power Bandwidth versus Load Capacitance (Grounded and Floating Load Configuration)
In the following figures, the maximum frequency periodic signal is plotted against the peak-to-peak
voltage.
PD32 V4 Manual
����
������������
����
������������
is the peak-to-peak output voltage, and ����
����(����−����)
100 130
47 kHz 34 kHz
15 kHz 11 kHz
4.7 kHz 3.4 kHz
1.5 kHz 1.1 kHz
470 Hz 340 Hz
150 Hz 114 Hz
48 Hz 34 Hz
16 Hz 11 Hz
19 × 10
6
= .
��������
����(����−����)
����
=
��������
�������� ����
����(����−����) ����
Load
Cap.
10 nF 23 kHz
30 nF 7.9 kHz
100 nF 2.3 kHz
300 nF 790 Hz
1 uF 230 Hz
3 uF 80 Hz
10 uF 24 Hz
30 uF
8
����
is the effective load
Floating Load Voltage (pk-pk)
100 200
11 kHz
3.9 kHz
1.1 kHz
390 Hz
119 Hz
40 Hz
12 Hz
8 Hz 4 Hz
260
8.5 kHz
2.8 kHz
850 Hz
284 Hz
85 Hz
28 Hz
9 Hz
3 Hz
15/02/2024