SBOA510 March   2021 OPA455 , OPA462

 

  1.   Trademarks
  2. 1Introduction
  3. 2Three Op Amp OPA462 HV Solution
  4. 3Lower Voltage, Lower Cost Three Op Amp Solution
  5. 4OPA462 300 Vpp Output Solution With Discrete Transistor Supply-Rail Drivers
  6. 5Lessons Learned from the Practical Implementation of the HV Op Amp Solutions
  7.   A Appendix
    1.     A.1 Overview
    2.     A.2 Summary of Results
    3.     A.3 Test Setup and Equipment
    4.     A.4 Printed Circuit Boards
    5.     A.5 Power Supply, Source Measurement Unit (SMU)
    6.     A.6 Arbitrary Waveform Generator (AWG)
    7.     A.7 Oscilloscope
    8.     A.8 Circuit 1: OPA462 Three op amp Solution
      1.      A.8.1 Schematic
      2.      A.8.2 Conventions
      3.      A.8.3 Results
    9.     A.9 Circuit 2: Lower Voltage, Lower Cost Three Op Amp Solution
      1.      A.9.1 Schematic
      2.      A.9.2 Conventions
      3.      A.9.3 Results
    10.     A.10 Circuit 3: OPA462 300 Vpp Output Solution With Discrete Transistor Supply-Rail Drivers
      1.      A.10.1 Schematic
      2.      A.10.2 Conventions
      3.      A.10.3 Results

A.2 Summary of Results

Table 6-1 summarizes the supplies and noninverting gain used for testing each of the three bootstrap circuit variants. Input and output magnitudes are reported for a 1-kHz sinusoidal input signal. More detailed results are shown in the individual section of each circuit. The input signal magnitudes were chosen by increasing the input signal amplitude until distortion or clipping was visible at the output, then backing off until that distortion/clipping was no longer apparent. Note that each circuit was also tested and shown to perform well in the inverting gain configuration; those results are not shown purely for the sake of brevity.

Table 6-1 Supplies and Noninverting Gain Used for Test
Circuit - U1 Supply Rail Sources HV OPA462 Op Amp
at U2 and U3		 LV OPA196 Op Amp
at U2 and U3		 Complimentary NPN-PNP
Darlington Transistors
Supplies

360V (±180 V)

220V (±110 V)

310V (±155 V)
Input Magnitude
(1-kHz Sinusoid)		 5.1 Vpp 4 Vpp 3.08 Vpp
Nominal Gain
(Non-inverting)		 66 V/V 51 V/V 96.5 V/V
Output Magnitude
(1-kHz Sinusoid)		 344 Vpp 206 Vpp 298 Vpp
Maximum Tested Load RL 5.74 kΩ 4 kΩ 5.65 kΩ