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OPA541SM Datasheet(PDF) 10 Page - Texas Instruments

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Part # OPA541SM
Description  High Power Monolithic Operational Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA541SM Datasheet(HTML) 10 Page - Texas Instruments

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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
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