STEVAL-ISA051V2

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The STEVAL-ISA051V2 is a standby LED driver for smart lighting applications. This device features universal input voltage range and a wide adjustment range for constant current output, making it ideal for use in demanding applications such as architectural lighting and street lighting. The STEVAL-ISA051V2 is equipped with an onboard single-stage Flyback converter, making it especially well-suited for use in simpe dimming systems with very low standby power consumption.

The STEVAL-ISA051V2 belongs to the family of Evaluation Boards - DC/DC & AC/DC (Off-Line) SMPS. This family of boards is designed to provide a complete design solution for constant current regulation applications. It is used to evaluate the performance, features, and stability of dc/dc converters. This evaluation board is a self-contained circuit that can be used for development and evaluation of power electronics circuit designs.

The STEVAL-ISA051V2 is based on a peak current mode flyback converter topology, in which energy is stored in the inductor between switching cycles. The inductor’s flux is alternately increased and decreased as it stores and releases energy. The voltage across the inductor is proportional to its flux, and this voltage is compared against the reference input voltage. Half-bridge power switch is used to generate the pulses, and a snubber circuit limits the ringing of the inductor.

The primary function of the STEVAL-ISA051V2 is to regulate a constant output current when powering low intensity LED lamps from an AC input. During normal operation, the standby LED driver responds to changes in the LED voltage while maintaining a relatively constant output current. In order to ensure accuracy of the output current, a current sensing circuit monitors the load current and adjusts the duty cycle of the switching pattern accordingly. This ensures that the current remains at the desired level regardless of variations in load.

The STEVAL-ISA051V2 also features an onboard ramp generator that allows for smooth dimming of the LED lamps. By varying the frequency of the ramp, the ramp generator can be configured to dim the LEDs in linear or non-linear fashion. The onboard dimming control circuitry ensures that the LED brightness is adjusted smoothly and without flicker.

In addition to its ability to accurately regulate current and dim LEDs, the STEVAL-ISA051V2 has been designed to have a very low standby current draw and improved EMI performance. This allows the evaluation board to meet the most stringent standards in terms of power efficiency and EMI.

Overall, the STEVAL-ISA051V2 provides a comprehensive design solution for constant current regulation applications. With its onboard Flyback converter, dimming control circuitry, and low standby current draw, it is an ideal solution for applications where accuracy, efficiency, and reliability are important.

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