LM27762EVM

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LM27762EVM Application Field and Working Principle

The LM27762EVMA is an advanced evaluation module (EVM) used to evaluate Texas Instruments’ (TI) LM27762 high-efficiency, low-power isolated flyback dc-dc converter. The LM27762EVM application field depends on the TI LM27762 which energizes low-power electronic systems where reduction of system power loss, noise, size, and weight is desirable. This highly integrated, two-stage (doubler/flyback), AC-DC power-converter family is well suited for applications in isolated 12V systems.

The LM27762EVMA eliminates the need for many of the comprehensive board-level tests, including in-circuit performance testing and load/transient characterization, that are typically required to evaluate dc-dc converter performance. The LM27762EVM is a complete power-supply system that provides an automated test bench. The EVM implementation of the device provides a platform for users to quickly configure specific operating parameters as well as predict and evaluate the converter’s performance under various scenarios.

The LM27762EVM provides the following operating points: +8V, +12V, +15V, and +21V at up to 5A output current and a maximum output power of 42W. These are available simply by adjusting the feedback resistor. The unit is built to the efficiency requirements of the LM27762 and evaluated to the parameters described in the LM27762 data sheet.

The LM27762EVM utilizes a non-isolated flyback topology with an integrated primary-side synchronous rectifier. The LM27762EVM evaluation board is a plug-in solution which includes a free-running resonant half bridge driver and an integrated true-on-time line synchronization signal. This is enabled via two integrated gate driver power MOSFETs and a collection of passive components for voltage and current sensing. A measurement circuit is also included for testing the response to the integrated current limiting feature of the LM27762.

The operating principle of the LM27762EVM is based on the LM27762. The LM27762 is a hybrid DC-DC converter, which combines the advantages of a buck converter and a low-loss, low-noise flyback converter. The modulator determines the level of current through the magnetics, which control the output voltage. When the output is regulated, the control loop is closed and the output voltage is controlled. The opto-coupler provides isolation between the input and the output sections.

The LM27762EVMA is a highly-efficient and cost-effective solution for system design evaluation and verification. The EVM is set up in a multilayer board consisting of printed circuit boards, isolated mounting holes, heat sinks and power components. The components are wired in the board assembly and tested for performance. Additionally, the EVM board comes with several features such as option for output voltage programming, evaluation of complete device features, load measurements, and device characterization.

The LM27762EVM is a flexible evaluation platform that simplifies the design process and reduces design time. The unit comes with all the features and flexibility necessary to accurately evaluate the performance of the LM27762 and the DC-DC adapter parts. This combined with the easy-to-use graphical user interface, help users to quickly and accurately design linear or switching DC-DC power supplies.

In conclusion, the LM27762EVM is an advanced evaluation module for the TI LM27762 isolated flyback dc-dc converter. It eliminates many of the complex board-level tests typically required to evaluate dc-dc converters. its highly efficient solution and its features help users quickly and accurately design low-noise, low-power, light weight, and size-efficient electronic systems. The LM27762EVM is categorized into Evaluation Boards - DC/DC & AC/DC (Off-Line) SMPS.

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