TPS548A20EVM-737

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The TPS548A20EVM-737 is an evaluation board designed by Texas Instruments to test and measure the performance of the TPS548A20 Synchronous Buck-Boost Converter. Synchronous buck-boost converters are ideal for applications that need to deliver a constant output voltage despite varying input voltage, as the converter dynamically adjusts the output voltage without manual control. The TPS548A20 is designed for high-current, LED-based applications and offers Smart Boost, which allows the output voltage to adjust at the start of the DC power supply.

The TPS548A20EVM-737 offers a range of features and functions to enable use in a variety of applications. It offers two independent power supply inputs—an input voltage of 4.5 V to 48 V and an auxiliary voltage of 5 V to 28 V. The output voltage can be adjusted from 0.8 V to 48 V at a maximum current of 5 A. It also offers protection features such as overvoltage, undervoltage, overcurrent, and short-circuit protection to ensure reliable performance.

The TPS548A20EVM-737 Evaluation Board comprises two main components: a booster circuit and a smart start circuit. The booster circuit allows the converter to switch between buck and boost mode, depending on the input and output voltage levels. The smart start circuit allows the output voltage to ramp up slowly at the start of the power supply to protect the load from overvoltage and inrush current. This also reduces the turn-on time from up to several seconds to typically 100 ms, significantly improving the user experience.

The converter on the TPS548A20EVM-737 can switch between buck and boost mode at a fast rate of 30,000 times per second and is designed for operation up to 5 MHz. The 10-bit digital-to-analogue converter (DAC) of the TPS548A20 allows the output voltage to be programmed to an accuracy of 0.4% while the phase-lock-loop (PLL) clock ensures low-noise operation. The evaluation board also features a precision LDO regulator, which can be used to power devices connected to the EVM.

In addition to these features, the evaluation board also provides a wide range of diagnostics and monitoring features to help understand converter performance under varying conditions. These include a voltage divider for output voltage sensing, a shunt for current measurements, and an LED array that indicates device status. The EVM’s control and monitoring pins are compatible with standard on-board test and measurement equipment, such as oscilloscopes and logic analysers.

The TPS548A20EVM-737 allows users to easily evaluate the performance of the TPS548A20 Synchronous Buck-Boost Converter. Its combination of high-performance features, protection, monitoring, and diagnostic tools make it ideal for LED-based applications where stable, reliable power delivery is critical.

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