NCP3121QPBCKGEVB

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The NCP3121QPBCKGEVB is a transformer-based evaluation board for DC/DC and AC/DC (off-line) switch mode power supplies (SMPS). The board is a versatile platform to facilitate the evaluation and development of switch mode topologies by analyzing the performance and output characteristics of sample power supply designs.

Introduction. The board contains an AC/DC or DC/DC circuit with adjustable control circuitry and soft start/stop circuitry. This sample board can be used to evaluate various DC/DC and AC/DC switch mode power topologies including quasi-resonant, active-clamp, forward, bridgeless, flyback, and active-clamp plus forward. The board supports both open-loop and closed-loop control schemes for a wide variety of voltage levels, switching frequencies, and output power levels.

Application Fields. The NCP3121QPBCKGEVB evaluation board is suitable for use in a variety of applications such as telecommunication systems, lighting, automotive, consumer electronics, medical and military applications. It can be used as a reference design to develop SMPS solutions from 0.5 W to 4 W of output power with adjustable output voltage from 0.5 V to 10 V.

Working Principle. The NCP3121QPBCKGEVB evaluation board consists of a transformer-based switched mode power supply (SMPS) with adjustable control circuitry. The board is powered by an external AC source which is rectified by a bridge diode. The rectified DC voltage is filtered to obtained a DC bus voltage. The DC bus voltage is shared by the primary and secondary windings of the transformer. The control circuitry uses a pulse-width-modulated (PWM) signal to control the switch mode power supply. The on-state duration of the switch determines the output voltage. The off-state duration determines the output current. The duty cycle of the PWM signal can be adjusted to effectively control the output power of the supply. The board is also equipped with a power LED indicator and a current limit circuit designed to protect against overload conditions.

Conclusion. The evaluation board NCP3121QPBCKGEVB is an excellent platform for evaluating DC/DC and AC/DC switch mode power supplies. It allows users to easily analyze the performance and output characteristics of a variety of switch mode power supply designs. It is suitable for a wide range of applications and enables users to develop SMPS solutions with adjustable output voltage from 0.5 V to 10 V and output power from 0.5 W to 4 W.

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