TPS51511EVM

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The TPS51511EVM is an Evaluation Module (EVM) from Texas Instruments, specifically designed as the complete AC/DC power supply solution for high performance, low output voltage applications. It is a cost- effective and ideal tool for evaluating the extensive range of products offered by TI for efficient and reliable power conversion. The EVM is configured as a 270 W power supply using the fully-integrated TPS51511 synchronous buck controller with envelope tracking. power supply engineers exploring cost effective solutions for low output voltage applications in their designs will greatly benefit from the fast and intuitive development process enabled by the TPS51511EVM.

Application Field

The TPS51511EVM is designed for low output voltage applications such as servers, storage, networking, industrial, lighting, and multi-channel power supplies with embedded controllers. The module is optimized for efficiency and allows designers to quickly evaluate the performance of high-performance buck devices with multiple output voltage, low noise, and high immunity features for their designs. In addition to its great performance, the TPS51511EVM also has the added advantage of maximum flexibility due to its ability to dynamically adjust output voltages from 0.7 V to 5 V, with output current from 5 A to 2.5 A.

Working Principle

The TPS51511EVM implements a synchronous buck converter using TI\'s TPS51511 controller. The converter takes a nominal input voltage from 75 V to 275 V while the output voltage is programmable from 0.7 V to 5 V. The EVM is designed to deliver up to 270 W of maximum output power, with switching frequencies up to 1.1 MHz and efficiency spreads between 79.4% to 94.8%.

The converter uses constant frequency, peak current mode control for fast transient response and reduced components count. This is done using a fixed off-time and an adjustable signal for peak current which defines the maximum ON-time. Soft start is enabled by adjusting the threshold voltage to set the on-time and by adjustably conditioning the driving signals with current ramps during soft-start phase.

The controller also features patented inductor DCR compensation and a high-frequency jittering technique to reduce high-frequency noise emissions. It also features a number of integrated functions such as programmable-prebiased output detector, short-circuit protection, and over-voltage protection.

The module operates with high efficiency and low noise due to its high switching frequency, and offers designers an easy way to quickly prototype and test a range of power supply designs. Through the integrated peripheral connections, the design and performance of the system can be adapted and tested for specific customer requirements.

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