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Evaluation Boards - Linear Voltage Regulators

TPS7A3401EVM-042 is an evaluation board developed by Texas Instruments. It is based on the TPS7A3401 regulator, a low dropout linear voltage regulator (LDO). The main purpose of the board is to evaluate the performance of the TPS7A3401 on a user-level application.

Application Fields

The TPS7A3401EVM-042 is designed for a wide range of applications. It is suitable for use in post-regulation systems that require high efficiency, small size, low power consumption, and low ripple and noise. It can also be used in communications systems, consumer electronics, battery-supported equipment, and automotive electronics.

Working Principle

The TPS7A3401 is a low dropout linear voltage regulator (LDO). It is designed to provide a regulated output voltage from an input voltage range of 3.2V to 18V. The output current is rated 0.1A (max) and the dropout voltage is typically 200mV (at 1mA). Furthermore, it offers excellent line and load regulation, fast transient response, and low-noise operation.

To regulate the output voltage, the TPS7A3401 utilizes a voltage-divider network, consisting of two resistors. The voltage divider maintains an output voltage that is equal to the reference voltage (Vref), minus the voltage drops across the resistors. Thus, by selecting the appropriate value of two resistors, the voltage division ratio can be set to the desired output voltage. The reference voltage is internal, derived directly from the bandgap reference, whose output voltage is equal to 1.220V.

The TPS7A3401 has a built-in thermal shutdown circuit that protects the chip from excessive temperature. When the internal temperature is higher than the thermal shutdown temperature (TSH), the regulator will turn off, and the output will be automatically disconnected from the input voltage supply. The regulator will remain off until the temperature falls below the thermal shutdown temperature.

Conclusion

The TPS7A3401EVM-042 is an evaluation board based on the TPS7A3401 regulator produced by Texas Instruments. It is specifically designed for post-regulation systems, communications systems, consumer electronics, and other industrial applications. It is capable of providing a precise regulated output voltage from an input voltage range of 3.2V to 18V, and can operate with as low as 200mV of dropout voltage. The chip features excellent line and load regulation, fast transient response, and low-noise operation. This evaluation board is suitable for the testing and evaluation of the TPS7A3401 regulator and related applications.

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