TPS78225EVM-445

Series:	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Channels per IC:	1 - Single
Moisture Sensitivity Level (MSL):	--
Voltage - Output:	2.5V
Current - Output:	150mA
Voltage - Input:	2.2 V ~ 5.5 V
Regulator Type:	Positive Fixed
Board Type:	Fully Populated
Supplied Contents:	Board(s)
Utilized IC / Part:	TPS78225

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Evaluation Boards - Linear Voltage Regulators

The TPS78225EVM-445 is an evaluation board for the TPS78225 linear voltage regulator from Texas Instruments. It provides a convenient way to evaluate the regulator’s 3A output with no need for external components. This board is designed to support a wide range of voltage and current combinations. The TPS78225EVM-445 offers a platform to easily evaluate the regulator’s features such as output voltage, current, ripple, thermal performance, and transient response.

Application Field

Applications for the TPS78225EVM-445 include programmable power supplies, data communications, industrial control systems, telecom systems, PC power supplies, DC-DC converters, power amplifiers, audio amplifiers, and portable device power management.

Working Principle

The TPS78225EVM-445 is based on the TPS78225 and has an input of 3.3V to 23V and an output of 0.8V to 5V. It operates in three modes of operation, constant voltage, constant current, and constant power. The output voltage is regulated by the integrated P-channel core regulator. It uses an external clock source, the reference voltage and two logic inputs to control the regulator. The TPS78225EVM-445 adjusts the output voltage and current accordingly.The TPS78225EVM-445 also features an onboard equivalent series resistance (ESR) adapter, providing the means to vary the input impedance of the regulator to fine tune the output voltage, current ripple, and output power. This adapter allows ESR compensation from 1mΩ to 10Ω. As the ESR increases, the output voltage drops with a compensating rise in ripple currents. This reduction in output voltage is compensated when the current sense resistor is added to the ESR configuration.The TPS78225EVM-445 board provides onboard monitoring components such as voltage and current sense resistors, thermal sensors, and watchdog circuit. These components are used to measure the regulator’s voltage, current, and temperature values. The onboard integrated circuit (IC) provides protection from over-voltage, over-current, and over-temperature conditions.The TPS78225EVM-445 includes other features such as power-on reset, power down mode, and system power control. The power-on reset provides a safe start up of the regulator. The power down mode allows for the safe shutdown of the system. Lastly, the system power control feature allows the voltage regulator to be disabled or enabled.

Performance

The TPS78225EVM-445 evaluation board provides excellent performance with a maximum output current of 3A, line regulation of 0.01%/V, and load regulation of 0.5%. The accuracy of the output voltage and current is well within ±3%, with a total output power up to 15W. The board also features a power supply rejection ratio (PSRR) of 75 dB and a fast transient response to steps in load. The low output voltage ripple is 0.4mV for 1mV steps with no load.

Conclusion

The TPS78225EVM-445 evaluation board is the perfect tool for evaluating and prototyping with the TPS78225 linear voltage regulator. This board is designed to provide an easy way to evaluate the regulator’s 3A output with no need for external components. Its wide range of voltage and current combinations make it a suitable board for many applications. The TPS78225EVM-445 also has various monitoring components to measure the regulator’s voltage, current, and temperature readings. Lastly, the board includes features such as power-on reset, power down mode, system power control, and ESR adapter. With its outstanding performance, the TPS78225EVM-445 is an ideal solution for many applications.

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