ISL6455EVAL1Z

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The ISL6455EVAL1Z evaluation board is designed to simplify the development of DC/DC and AC/DC (off-line) SMPS .The board consists of main power switch, rectifiers, a Boost converter, a controller (ISL6455), an integrated input-output filter, a start-up circuit, and feedback components. The design incorporates pulse-width modulation (PWM) controllers that offer precision control of power conversion, small solution size, excellent power efficiency, and good power regulation. The board can accommodate a wide range of input and output voltages, as well as various input voltage and current levels.

The main power switch of the ISL6455EVAL1Z is a priori PS2505-1, a DPAK package that is rated to handle up to 50A of current. It is designed to boost incoming AC voltage to a regulated 5V output voltage. The rectifier, a priori MUR3100, is rated to handle up to 30A of current. It is designed to protect the power switch from reverse current and provide ESD protection.

The ISL6455EVAL1Z board features a Boost converter design to facilitate smooth DC-to-DC conversion. This structure consists of a MOSFET power switch (PS2505) and supporting circuitry. When the power switch is in the low-side configuration, the MOSFET is operating in a linear off-mode to reduce switching losses. The Boost converter output is regulated by an integrated current-mode controller. The Boost converter is optimized for high efficiency and low switching losses.

The integrated input-output filter of the ISL6455EVAL1Z is designed to minimize input-side voltage ripple. It also provides EMI filtering of the input and output voltages. The front-end start-up circuit uses the ISL6455 controller to drive the power switch and induce current to the output stage. The ISL6455 is a highly integrated device which combines integrated LDO, fault protection, and PWM controllers in a single package.

The feedback components of the ISL6455EVAL1Z provide a precise control of the regulator’s output voltage and current. They consist of a sense resistor connected to the power stage output and an optocoupler connected to the power stage input. The optocoupler provides feedback to the controller to adjust the output voltage and current based on the sensed voltage and current. The output voltage of the ISL6455EVAL1Z is monitored with a voltage-sensing circuit for fast-responding to changes.

The ISL6455EVAL1Z evaluation board is designed to provide a comprehensive solution for DC/DC and AC/DC (off-line) SMPS applications. The design incorporates sophisticated components along with an easy to use user interface. The board is capable of performing a wide range of conversion tasks and is an ideal choice for designers working on high power applications. Depending on the desired application, the board can handle different input and output voltages as well as various input voltage and current levels.

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