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OPA2192 Datasheet(PDF) 27 Page - Texas Instruments |
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OPA2192 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 51 page  Cload + ± Vin Vout +Vs Riso -Vs 0 5 10 15 20 25 30 35 40 45 50 10p 100p 1n Capacitive Load (F) 0 25 50 ± + RI = 1 kO VIN + 18 V ± 18 V CL OPA192 + ± RF = 1 kO RISO G = -1 C013 R ISO = 0 R ISO = 25 R ISO = 50 RI N RF N 0 5 10 15 20 25 30 35 40 45 50 10p 100p 1n Capacitive Load (F) 0 25 50 C013 R ISO = 0 R ISO = 25 R ISO = 50 CL RL ± + VIN + 18 V ± 18 V OPA192 + ± RISO G = +1 OPA192, OPA2192, OPA4192 www.ti.com SBOS620D – DECEMBER 2013 – REVISED SEPTEMBER 2015 Figure 60. Small-Signal Overshoot vs Capacitive Load Figure 61. Small-Signal Overshoot vs Capacitive Load (100-mV Output Step) (100-mV Output Step) For additional drive capability in unity-gain configurations, improve capacitive load drive by inserting a small (10 Ω to 20 Ω) resistor, RISO, in series with the output, as shown in Figure 62. This resistor significantly 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, thus introducing a gain error at the output and slightly reducing the output swing. The error introduced is proportional to the ratio RISO / RL, and is generally negligible at low output levels. A high capacitive load drive makes the OPA192 well suited for applications such as reference buffers, MOSFET gate drives, and cable-shield drives. The circuit shown in Figure 62 uses an isolation resistor, RISO, to stabilize the output of an op amp. RISO modifies the open-loop gain of the system for increased phase margin, and results using the OPA192 are summarized in Table 3. For additional information on techniques to optimize and design using this circuit, TI Precision Design TIDU032 details complete design goals, simulation, and test results. Figure 62. Extending Capacitive Load Drive with the OPA192 Table 3. OPA192 Capacitive Load Drive Solution Using Isolation Resistor Comparison of Calculated and Measured Results PARAMETER VALUE Capacitive Load 100 pF 1000 pF 0.01 µF 0.1 µF 1 µF Phase Margin 45° 60° 45° 60° 45° 60° 45° 60° 45° 60° RISO (Ω) 47.0 360.0 24.0 100.0 20.0 51.0 6.2 15.8 2.0 4.7 Measured 23.2 8.6 10.4 22.5 9.0 22.1 8.7 23.1 8.6 21.0 8.6 Overshoot (%) Calculated PM 45.1° 58.1° 45.8° 59.7° 46.1° 60.1° 45.2° 60.2° 47.2° 60.2° For step-by-step design procedure, circuit schematics, bill of materials, printed circuit board (PCB) files, simulation results, and test results, refer to TI Precision Design TIDU032, Capacitive Load Drive Solution using an Isolation Resistor . Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback 27 Product Folder Links: OPA192 OPA2192 OPA4192 |
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