TPS51285ARUKT

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TPS51285ARUKT Application Field and Working Principle

The TPS51285ARUKT is a low-power voltage regulator that combines linear and active switching modes for use in consumer, industrial, and automotive markets. It targets consumer and industrial applications that require high-current, low-voltage, and multiphase output power. The device is available in both step-up and step-down configurations.

The device integrates an advanced switching power stage, an output current sense circuit, and a pulse width modulation (PWM) controller that minimizes the power used during light-load and low-voltage conditions. This regulator combines both linear and high-frequency active-switching strategies, enabling the device to improve system efficiency and accuracy while providing a very low-output impedance.

The device provides four output phases with identical currents, which can be enabled or disabled individually. This regulator specifications include a maximum 6 V input voltage, up to 4 A output current, and a switching frequency of 1.2 MHz.

Working Principle

The TPS51285ARUKT works by taking the input power and regulating it to the desired output voltage, regardless of its input voltage. The device uses a combination of linear and active switching modes.

In linear mode, the controller adjusts the output current to regulate the output voltage. The switching controller controls the active-switching mode, switching the output power between the converter and the linear mode depending on the load current. This enables the device to maximize the efficiency by using the active-switching mode when the current flow is high and using the linear mode when the current is low.

In addition, the device also features current sense circuitry that prevents the output voltage from dropping due to heavy load currents, sense circuitry that monitors the output voltage, and adaptive dead time control to reduce switching losses. The device also includes protection features such as short-circuit protection, over-temperature protection, and overvoltage protection.

Conclusion

The TPS51285ARUKT is a low-power voltage regulator that combines both linear and active switching modes for use in consumer, industrial, and automotive markets. It provides four output phases with identical currents and can be enabled or disabled individually. This device also includes protection features such as short-circuit protection, over-temperature protection, and over-voltage protection. By combining linear and active switching technologies, the device is able to improve system efficiency and accuracy while providing a very low-output impedance.

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