STEVAL-ISA077V1

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The STEVAL-ISA077V1 evaluation board is a solution offered by STMicroelectronics to understand and evaluate their range of fixed-frequency, current-mode, universal off-line switchers. It is an application-oriented circuit board for testing and optimizing designs for various applications.

The STEVAL-ISA077V1 is designed for use with a range of AC input voltages and includes a protection circuit to guard against mains voltages up to 300VAC. The evaluation board consists of an STGW30NC60 power module, a 16 VOUT winding stack transformer, and an STTR1265 pulse transformer. These components, together with the necessary rectifier, EMI filter, protection, and blanking circuits create a compact 85W dual output power supply in a slim, 12.5mm-high package.

Using the STEVAL-ISA077V1, engineers can create a standardized SMPS design by connecting the input voltage and the output voltage to the STGW30N60 power module. This makes it easier to develop a secure and optimized power supply for applications requiring a high degree of electrical safety. The STEVAL-ISA077V1 is compatible with the STGW30N60 in a wide range of power supply applications.

The STEVAL-ISA077V1 can work in two different modes: continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM). In CCM, the power MOSFET is turned on continuously and the transformer core stays in an energized state. In DCM, the power MOSFET is on and off periodically and the transformer core de-energizes completely during the off-time. Engineers can switch between CCM and DCM modes by changing a resistor value in the board.

The board operates on a fixed frequency of 100 kHz to maximize the efficiency of the power MOSFETs and ensure uniform operation of the entire SMPS. This is important for applications that demand high levels of synchronization for both outputs and short power-on times. The power supply is also capable of delivering a wide range of output voltages, from 0.5 V up to 150 V, while maintaining low ripple and noise levels.

The STEVAL-ISA077V1 is a compact and cost-effective evaluation board with a wide range of features and functionalities for AC/DC off-line SMPS applications. STMicroelectronics provides multiple tools and features to allow engineers to make the most of the evaluation board, such as full circuit schematics, comprehensive design guidelines and application notes, and the STEVAL-ISA077V1 user manual. With these resources, engineers can quickly develop and optimize low-cost, high-efficiency power supplies to suit their application’s requirements.

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