Design & Products

Design Example

High-Voltage General-Purpose Op Amp

A general-purpose high-voltage op amp (operational amplifier: an amplifier that boosts the voltage difference between its two inputs), designed in a BCD (Bipolar-CMOS-DMOS) process, which builds bipolar, CMOS and high-voltage DMOS transistors on one chip.

Design targets

Supply range
±4 V to ±40 V
Output swing
±37 V with ±40 V supplies
Input common-mode range
±38 V with ±40 V supplies
Unity-gain bandwidth
1 MHz
Slew rate
2.5 V/µs
Operating temperature
−55 °C to +125 °C

Features (design targets)

  • Input over-voltage protection: inputs tolerate voltages up to the supply rails, to ±40 V
  • Output short-circuit protection
  • Internal compensation, stable at unity gain
  • Offset-null pins
  • Supply current, slew rate and gain designed to stay nearly constant across supply voltage and temperature

Applications

  • Piezo and actuator drive
  • Test, measurement and instrumentation
  • High-common-mode measurement
  • Externally boosted power stages
  • Replacing legacy ±40 V op amps

Pinout: pin-compatible with the industry-standard 8-pin op amp pinout, designed as a drop-in replacement in legacy high-voltage op amp designs. Pins 1 and 5: offset null; 2: inverting input; 3: non-inverting input; 4: V−; 6: output; 7: V+; 8: no connection. No package is specified.

Talk to us: tell us about your application through Contact. Target details and, later, simulation results are available on request.

Discuss an Application