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OPA547 Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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OPA547 Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 16 page OPA547 11 SBOS056A www.ti.com Output Disable and Thermal Shutdown Status As mentioned earlier, the OPA547’s output can be disabled and the disable status can be monitored simultaneously. Figures 9 and 10 provide examples using a single supply and dual supplies, respectively. OUTPUT STAGE COMPENSATION The complex load impedances common in power op amp applications can cause output stage instability. For normal operation output compensation circuitry is not typically required. However, if the OPA547 is intended to be driven into current limit, a R/C network may be required. Figure 11 shows an output series R/C compensation (snubber) network (3 Ω in series with 0.01µF) which generally provides excel- lent stability. Some variations in circuit values may be required with certain loads. OPA547 V+ E/S Open Drain (Output Disable) HCT (Thermal Status Shutdown) V– FIGURE 9. Output Disable and Thermal Shutdown Status with a Single Supply. OUTPUT PROTECTION Reactive and EMF-generating loads can return load cur- rent to the amplifier, causing the output voltage to exceed the power supply voltage. This damaging condition can be avoided with clamp diodes from the output terminal to the power supplies as shown in Figure 11. Schottkey rectifier diodes with a 1A or greater continuous rating are recommended. FIGURE 10. Output Disable and Thermal Shutdown Status with Dual Supplies. FIGURE 11. Motor Drive Circuit. G = – = –4 R 2 R 1 3 Ω (Carbon) 0.01µF R 2 20k Ω R 1 5k Ω OPA547 V– V+ V IN Motor D 1 D 2 D 1, D2 : International Rectifier 11DQ06. OPA547 V+ E/S NOTE: (1) Optional—may be required to limit leakage current of optocoupler at high temperatures. V– (1) 6 1 2 4N38 Optocoupler 5 4 HCT or TTL In 5V 6 2 1 4N38 Optocoupler 5 4 Zetex ZVN3310 TTL Out 7.5k Ω 1W 5V |
Similar Part No. - OPA547_02 |
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Similar Description - OPA547_02 |
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