PI3105-00-EVAL1

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PI3105-00-EVAL1 evaluation board is used to evaluate offline SMPS (switched mode power supply) topologies. It can be used for offline AC/DC or DC/DC SMPS evaluation. It is a single-stage, isolated SEPIC (single-ended primary-inductor converter) flyback topology. It is packaged along with the well-known PI3105-00 controller IC for easy evaluation of offline switching power supplies, up to 75 W in either a fixed frequency pulsed-mode or continuous variable frequency current mode.

PI3105-00-EVAL1 evaluation board consists of a core power switch, controller IC, a pulsed optocoupler, a NCP1200 PWM controller, a ferrite inductor, a low profile SOT-89 package and several other peripheral components. It operates from an input voltage range of 4.75-15V and can provide output power up to 75W with an efficiency of up to 85%. It is equipped with all ports needed for easy connection of peripheral components for controlling the output voltage.

The core power switch used in PI3105-00-EVAL1 can be any of several low-side N-channel MOSFETs. It is responsible for controlling the amount of energy transferred from the input to the output. This depends on the amount of current flowing through it, as well as the level of resistance that exists between it and the ground connection. The low-side MOSFET is driven by a PWM signal from the NCP1200 controller.

The PI3105-00 controller IC controls the output voltage. It senses the input voltage and limits it to the safe operating range. Then it adjusts the output voltage to the desired level. It can also detect any over-current conditions and shut off the power accordingly. Furthermore, it has an inhibit pin, which enables or disables the controller based on the external logic level.

The pulsed optocoupler used in the PI3105-00-EVAL1 is responsible for providing feedback to the PI3105-00 controller IC. It consists of an LED and a photodiode connected in series. The LED is driven with a rectangular pulse that is related to the output voltage, and the photodiode is connected to the sensing pin of the controller IC. After the photo diode receives the pulsed signal, its output voltage is compared to the feedback voltage set by the resistor network on the board. Once the two voltages match, the output is said to be in regulation.

The ferrite inductor used in the PI3105-00-EVAL1 is responsible for storing energy during the switching process. It is a type of magnetic material that is capable of storing energy and releasing it over time. As current flows through it, an electromagnetic field is generated, and when the current is interrupted, this field collapses and the stored energy is released. This energy is used to drive the output voltage.

The low profile SOT-89 package of the PI3105-00-EVAL1 facilitates easier board layout and installation. Its compact size enables it to be used in space-constrained applications. It also has a higher power density, enabling it to be used with less components for higher power loads. Furthermore, it gives protection to the components from any external interference.

In conclusion, the PI3105-00-EVAL1 evaluation board is an efficient and economically viable solution for evaluating AC/DC or DC/DC SMPS topologies for up to 75W output power. Thanks to its included controller IC, and other peripheral components, it is a cost-effective solution for power design engineers. It is easy to install and use, and is suitable for a variety of design applications.

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