Texas Instruments OPA521EVM, Руководство пользователя, Страница: 3 / 15

18 k
126 k
-IN
+IN
GAIN_SET
V+
GND
VOUT
ILIM EN
IQSET
IFLAG TFLAG
Limits & Alarms
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Overview
3 SBOU208 – June 2018
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Copyright © 2018, Texas Instruments Incorporated
OPA521EVM User's Guide
1 Overview
1.1 General Information About the OPA521
The OPA521 is a 24-V power operational amplifier (PA) with high slew rate capable of driving up to 1.9 A
continuous output current over the specified junction temperature range of –40°C to +125°C. This amplifier
offers an adjustable current limit, a thermal shutdown indicator, and enable/shutdown features. The PA is
configured with an inverting gain of 7 V/V, has a low-pass filter response, and maintains excellent linearity
and low distortion throughout its bandwidth. The PA block is shown in
Figure 1 .
Figure 1. OPA521 Device Functional Block Diagram
The OPA521 can be used as a line driver for narrow band power line communcations (PLC).
1.2 High Power Warning
CAUTION
The OPA521 evaluation module contains a high voltage, high current power
amplifier. Please use precautions when operating the OPA521 EVM.
The possibility for accidental electrical shock increases with increased potential difference and the user
must take precautions to avoid contact with the PC board when live voltage is present. If circuit probing is
required and voltages are present, it is a best practice to apply the “one hand rule.” Use an insulated
probe and only one hand when probing the live circuit. Keep the other hand away from the circuit and any
metal contacts in the immediate area through which current could flow.
Power operational amplifiers can generate a lot of heat under some operating conditions. That excess
heat must be conducted away from amplifier in order to assure correct operation and long life. A passive
heat sink, or heat sink/fan assembly, may be employed. Heat sinks can become hot to the touch if the
power being dissipated as heat is high relative to the heat sink’s ability to dissipate it. When that occurs
contacting the heat sink with bare skin may cause a user to become startled, or possibly receive a burn.
Therefore, it is best to avoid any contact with the heat sink when the circuit is in use, or cooling down after
use.