TPS76628D

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TPS76628D Application Field and Working Principle

The TPS76628D from TI is a synchronous buck regulator with a 30V rated voltage. It integrates a controller, dual low on-resistance power MOSFETs, and a wide range of protection features, making it suitable for a variety of applications. It has a floating MOSFET control, high switching frequency and efficiencies up to 96%. It is designed to deliver a regulated output designed to quickly turn on and off.

This voltage regulator can be used in a wide range of applications, including general-purpose voltage regulation, LED lighting, automotive, point-of-load regulation, low power processor core regulation, etc. It offers a range of features to ensure stable output voltage and protection for your system. It offers a fast transient response due to its integration of current sensing circuitry, which allows for tracking of load changes. It also has efficient low quiescent current and maximum power dissipation features.

Working Principle

The TPS76628D is based on a synchronous buck regulator topology, which is the only topology that can deliver the full rated output current at all times. This topology uses a PWM controlled N-channel MOSFET to convert the input voltage to a lower regulated output voltage. The output voltage is regulated by a fixed frequency Current Mode PWM control. This PWM control provides fast transient response and low output voltage ripple.

The TPS76628D performance is enhanced with the addition of dual synchronous rectifiers instead of a single one. The synchronous rectifiers are used to provide a higher efficiency, faster transient response and lower output voltage ripple. The synchronous rectification controls the current through the MOSFETs in synchrony with the input voltage cycle. This operation is much more efficient than an asynchronous free wheeling diode because of the lower losses produced by the MOSFETs.

The TPS76628D is designed to provide an adjustable output voltage with a voltage range of 0.8 uV to 30V. It operates in a wide switching frequency range of 200 kHz to 2.2 MHz, allowing it to deliver an adjustable power of up to 24A in a thermally enhanced TSSOP-20 package. It also incorporates a number of protection functions to provide a reliable operation during fault conditions, such as overvoltage protection and overcurrent protection.

In conclusion, the TPS76628D is a synchronous buck regulator with a wide range of applications due to its high voltage ratings and efficient power management features. It has a PWM control topology that offers fast transient response and low output ripple, as well as protection features for reliable operation.

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