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OPA445AU Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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OPA445AU Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 11 page 10 ® OPA445 R 1 R 2 OPA445 OPA445 “SLAVE” “MASTER” V IN R S (1) 10 Ω R S (1) 10 Ω R L NOTE: (1) R S resistors minimize the circulating current that will always flow between the two devices due to V OS errors. INCREASING OUTPUT CURRENT In those applications where the 15mA of output current is not sufficient to drive the required load, output current can be increased by connecting two or more OPA445s in parallel as shown in Figure 7. Amplifier A1 is the “master” amplifier and may be configured in virtually an op amp circuit. Amplifier A2, the “slave”, is configured as a unity gain buffer. Alternatively, external output transistors can be used to boost output current. The circuit in Figure 8 is capable of supplying output currents up to 1A. INPUT PROTECTION The inputs of conventional FET-input op amps should be protected against destructive currents that can flow when input FET gate-to-substrate isolation diodes are forward- biased. This can occur if the input voltage exceeds the power supplies or there is an input voltage with VS = 0V. Protection is easily accomplished with a resistor in series with the input. Care should be taken because the resistance in series with the input capacitance may affect stability. Many input signals are inherently current-limited, therefore, a limiting resistor may not be required. FIGURE 7. Parallel Amplifiers Increase Output Current Capability. R 1 R 2 OPA445 TIP30C TIP29C V IN +45V –45V V O R 3 (1) 100 Ω NOTE: (1) Provides current limit for OPA445 and allows the amplifier to drive the load when the output is between 0.7V and –0.7V. R 4 0.2 Ω R 4 0.2 Ω LOAD C F FIGURE 8. External Output Transistors Boost Output Current up to 1 Amp. |
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