MC34063SMDBGEVB

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The MC34063SMDBGEVB is an Evaluation Board specifically designed for studying the performance of the MC34063 device in the offline, DC/DC converter application field. This device is a popular switch-mode voltage regulator, assembled in an SO-8 SMT package. It contains all of the necessary components to implement a step-up, step-down, or an inverting converter.

MC34063SMDBGEVB includes a broad set of features such as minimal external components count, low power consumption, wide input voltage range, and the presence of a power-good output indicator. The device is highly robust and allow adjustable output current limiting for safe operation. Additionally, the board allows the accurate evaluation of the performance by giving the user the possibility to adjust the frequency of the switching regulator and to control its output voltage and current.

The working principle of MC34063SMDBGEVB is based on the MC34063 control IC which regulates the voltage by controlling the ON-time of an external bipolar power switch. This IC works in constant frequency mode and has current sensing capabilities, allowing for robust control loops. The circuit allows the user to adjust the output voltage with just 3 external components, making it ideal for simple applications involving low-power voltage conversion.

The diagram below describing the functioning principle of MC34063SMDBGEVB uses the buck topology (step-down) for illustration purposes. As shown in the diagram, the switch is turned ON by the square wave output of the IC. When the switch is ON, it draws current from the input source V_in, through an external step-down transformer and then through an inductor to the output regulator.

The output voltage is determined by the applied voltage ratio of the transformer, while the output current is determined by the magnitude of the coil\'s inductance. When the switch is OFF, the energy stored in the inductor is released to the output capacitor, thereby stabilizing the output voltage. The power-good output signal (PG) will be high when the output voltage is within the preset limits. In case of a short-circuit or over-current situation, the PG signal will go low.

In conclusion, MC34063SMDBGEVB is a multi-purpose evaluation board for various applications involving DC/DC & AC/DC (Off-Line) SMPS. It features a small size, low power consumption, and the presence of a power-good output indicator. Additionally, the board allows the user to control the output voltage level and current limit. All these benefits make it an ideal choice for applications requiring a low-cost solution with adjustable parameters.

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