PA78DK Cirrus Logic Inc, PA78DK Datasheet - Page 3

• Manufacturer Part Number: PA78DK
• Description: IC PWR AMP 350V 200MA 20PSOP
• Manufacturer: Cirrus Logic Inc
• Series: Apex Precision Power™r

Specifications of PA78DK

• Amplifier Type: Power
• Number Of Circuits: 1
• Slew Rate: 350 V/µs
• Gain Bandwidth Product: 1MHz
• Current - Input Bias: 8.5pA
• Voltage - Input Offset: 8000µV
• Current - Supply: 700µA
• Current - Output / Channel: 150mA
• Voltage - Supply, Single/dual (±): 20 V ~ 350 V, ±10 V ~ 175 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-PSOP
• Number Of Channels: 1
• Voltage Gain Db: 120 dB
• Common Mode Rejection Ratio (min): 90 dB
• Input Offset Voltage: 25 mV
• Operating Supply Voltage: 300 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Maximum Dual Supply Voltage: +/- 175 V
• Minimum Operating Temperature: - 40 C
• For Use With: 598-1398 - KIT EVALUATION PA78/PA79
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1351

Figure 3. Output Waveforms – a) Left module output; b) Right module output; C) Waveform appearing across the piezoelectric
actuator.
ponents:
and R
essential to prevent signals from inadvertently feeding back to
the amplifier. A piezoelectric transducer can convert mechanical
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What follows is a discussion of the principal passive com-
R
CR
3
and R
1
4
through CR
center the outputs of the PA78 ICs about 85V.
4
— The feedback circuit comprising resistors R
4
— In any piezoelectric actuator circuit it is
3
energy into electrical energy just as easily as vice-versa. So if
something were to bump the transducer, it could create a lot
of energy that would travel backwards into the output of the
amplifier, which could be destructive. However, by connecting
several ultra-fast, MUR160 diodes (CR
of each amplifier to its corresponding power supply rails, as
shown in Figure 2, each amplifier is protected.
1
– CR
4
) from the output
3