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OPA541SM Datasheet(PDF) 10 Page - Texas Instruments |
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OPA541SM Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page 10 1 0.1 1 10 100 |V – V | (V) S OUT T = +25°C T = +85°C C C AP, AM BM, SM T C = +125°C “M” Package only θHS = TCASE – TAMBIENT PD (max) OPA541 SBOS153B – SEPTEMBER 2000 – REVISED JANUARY 2016 www.ti.com Application Information (continued) (3) Commercially available heat sinks often specify their thermal resistance. These ratings are often suspect, however, because they depend greatly on the mounting environment and air flow conditions. Actual thermal performance should be verified by measuring the case temperature under the required load and environmental conditions. No insulating hardware is required when using the TO-3 package. Because mica and other similar insulators typically add approximately 0.7°C/W thermal resistance, their elimination significantly improves thermal performance. See Related Documentation for further details on heat sinking. On the power plastic package, the metal tab may have a high or low impedance connection to –VS. The case must be allowed to float, and likely assumes the potential of –VS. Current must not be conducted through the case. 8.1.3 Safe Operating Area The safe operating area (SOA) plot provides comprehensive information on the power-handling abilities of the OPA541. The SOA shows the allowable output current as a function of the voltage across the conducting output transistor (see Figure 11). This voltage is equal to the power supply voltage minus the output voltage. For example, as the amplifier output swings near the positive power supply voltage, the voltage across the output transistor decreases and the device can safely provide large output currents demanded by the load. Short circuit protection requires evaluation of the SOA. When the amplifier output is shorted to ground, the full power supply voltage is impressed across the conducting output transistor. The current limit must be set to a value which is safe for the power supply voltage used. For instance, with VS ±35 V, a short to ground would force 35 V across the conducting power transistor. A current limit of 1.8 A would be safe. Figure 11. Safe Operating Area Reactive or EMF-generating loads such as DC motors can present difficult SOA requirements. With a purely reactive load, output voltage and load current are 90° out of phase. Thus, peak output current occurs when the output voltage is zero and the voltage across the conducting transistor is equal to the full power supply voltage. See Related Documentation for further information on evaluating SOA. 8.1.4 Replacing Hybrid Power Amplifiers The OPA541 can be used in applications currently using various hybrid power amplifiers, including the OPA501, OPA511, OPA512, and 3573. Of course, the application must be evaluated to assure that the output capability and other performance attributes of the OPA541 meet the necessary requirements. These hybrid power amplifiers use two current limit resistors to independently set the positive and negative current limit value. Because the OPA541 uses only one current limit resistor to set both the positive and negative current limit, only one resistor such as Figure 12 need be installed. If installed, the resistor connected to pin 2 (TO-3 package) is superfluous, but is does no harm. 10 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated Product Folder Links: OPA541 |
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