PA78DK Cirrus Logic Inc, PA78DK Datasheet
PA78DK
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PA78DK Summary of contents
Page 1
INTRODuCTION The rapidly expanding interest in piezoelectric actuators has made demands upon operational power amplifiers for higher speed and low power dissipation. These devices ...
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Figure 2. Bridge Connected – A pair of PA78s drive the piezoelectric actuator and are powered by asymmetric power supplies at +175V and -5V. II. BRIDGE-CONNECTED PIEZOELECTRIC ACTuATOR DRIvER A piezoelectric actuator requires a high-voltage driver ca- pable of delivering ...
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Figure 3. Output Waveforms – a) Left module output; b) Right module output; C) Waveform appearing across the piezoelectric actuator. What follows is a discussion of the principal passive com- ponents: R and R — The feedback circuit comprising resistors ...
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Computing the maximum dissipated power per module — The load impedance of the piezoelectric actuator is given by the expression: ω To compute the maximum power per module the equiva- lent circuit shown in Figure 4 is employed. By doing ...
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III. DRIvING DEFLECTION PLATES The circuit shown in Figure 5 was developed for 'Continuous Drop' printing applications. In this circuit the PA78 power op- erational amplifier connects directly to the deflection plates. Electrostatically-charged ink droplets, typically microns ...
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Iv. DEFLECTION PLATES DRIvER wITH OvERDRIvE What is different about the circuit shown in Figure 6, com- pared with Figure 5, is that it is assumed that the deflection plates are driven via a 25-foot length of coax that exhibits ...