7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

The OPAx596 are low power (420μA), high-slew rate (100V/μs), 85V power operational amplifiers (op amps).

These op amps use a proprietary design technique to achieve a very high slewing capability while consuming

minimal power. The low power consumption helps reduce heat generation on the board while the output swings

near the supply rail. The high slew reduces slew related distortion at the output when dealing with large peak,

high frequency signals.

7.2 Typical Applications

7.2.1 Bridge-Connected Piezoelectric Driver

+

–

OPAx596

60V

5V

10

100k

10k

PDAC

3.79k

AVDD

AVSS

+

–

OPAx596

60V

5V

100k

100k

V

BIAS

100V

PP

95.3k

60V

10

1nF

1nF

5V

PP

Figure 7-1. 100VPP Piezoelectric Driver With Bridge Connected Load

7.2.1.1 Design Requirements

The OPAx596 is used to drive a piezoelectric actuator with a 100V operating range at a relatively low frequency

of 100Hz. The large capacitance inherent to the piezoelectric actuator can cause undesired ringing of the driver

amplifier. An inaccurate response of the actuator is possible due in part to amplifier instability. Adequate phase

margin for a 500nF equivalent load and wide output swing capability is necessary for a robust driver circuit for

the piezoelectric actuator presented here. Table 7-1 shows the design parameters.

Table 7-1. Design Parameters

PARAMETER

VALUE

Power supply voltage

65V

Piezoelectric actuator capacitance (1kHz)

500nF

Piezoelectric operating voltage range

0V to 100V

Operating frequency

100Hz

DAC output voltage

5VPP

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OPA596, OPA2596

SBOSA42B – JUNE 2024 – REVISED DECEMBER 2025

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