C

load

+

±

V

in

V

out

+V

s

R

iso

-V

s

21

OPA202, OPA2202, OPA4202

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SBOS812G – OCTOBER 2017 – REVISED MARCH 2020

Product Folder Links: OPA202 OPA2202 OPA4202

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Copyright © 2017–2020, Texas Instruments Incorporated

Feature Description (continued)

with the output to improve capacitive load drive, as shown in Figure 41. This resistor reduces ringing and

maintains dc performance for purely capacitive loads. However, if a resistive load is in parallel with the capacitive

load, then a voltage divider is created, which introduces a gain error at the output and reduces the output swing.

load drive makes the OPAx202 a great choice for applications such as reference buffers, MOSFET gate drives,

using the OPAx202. For additional information on techniques to optimize and design using this circuit, TI

Precision Design TIPD128 details complete design goals, simulation, and test results.

Figure 41. Extending Capacitive Load Drive With the OPAx202

Table 2. OPAx202 Capacitive Load Drive Solution Using Isolation Resistor Measured Results

PARAMETER

MEASURED OVERSHOOT (%)

INVERTING CONFIGURATION

NONINVERTING CONFIGURATION

31

8.6

6.6

6.6

9.3

9

9.4

251

6.7

6.4

6.7

8.9

8.9

8.9

421

6.4

6.3

6.6

8.8

8.8

8.7

641

6.7

6.3

6.5

8.1

8.8

8.5

1079

6.1

6.1

6.4

8.6

8.7

9.8

1539

6.4

6.3

6.1

8.9

10.3

10.1

2579

6.1

6.3

6.9

16

13.3

12

3949

8.1

7.9

8.3

25

16

14.1

6269

14.9

10.8

9.9

33.1

18.1

14.5

10139

21.8

13.5

10.8

40.2

19.1

15.4

15729

29.4

15.2

11.6

46.2

19.6

14.5

25069

37

16.5

12.3

52.6

19.2

13.9

For step-by-step design procedure, circuit schematics, bill of materials, printed circuit board (PCB) files, simulation results, and test results,

see TIPD128, Capacitive Load Drive Solution Using an Isolation Resistor verified reference design.