SP6652EB

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SP6652EB Application Field and Working Principle

SP6652EB is an evaluation board equipped with AC/DC offline switch power supply, which is designed to exploit SP6652EB Green Mode PWM controller mainly. This board can support new IC design evaluation, circuit debug, performance test or application demonstration. It offers a quick and cost effective solution to shorten product time-to-market without developing a specific AC/DC board. In today\'s article, we will provide a brief overview on its application field and explain its working principle.

Application Field

SP6652EB is typically applied to power supply for LED lighting, home appliance, portable electronics, telecom device and industrial applications. This evaluation board features high power density and low EMI, and optimized solutions with integrated PFC and PWM, allowing designers to quickly develop different solutions or applications.

Working Principle

The SP6652EB utilizes a step down voltage regulator with primary and secondary sides to provide the desired output voltage and current. On the primary side, the input voltage is rectified and filtered by a bulky capacitor to provide "key on" voltage for the switch power supply circuit to function properly. The output is then controlled by a PWM (Pulse Width Modulation) circuit with either a PFC circuit or an integrated soft start drop out current limiter. To control the output, it is regulated with a regulator. SP6652EB utilizes a voltage feedback loop with the output voltage connected to the PWM\'s internal reference voltage, and then connected through a series of low pass filters and integrated op-amps to create an error signal which can be sent back to the PWM. The error signal will be amplified and used as a control signal to adjust the PWM duty cycle to maintain the correct output voltage.

For SP6652EB, the internal reference voltage is also derived from an external voltage divider network. This allows the set output voltage to be easily adjustable. The reference voltage is then fed through two high speed error amplifiers, which adjust the pulse width of the PWM based on the error signal generated by a comparison between the reference signal and the sensed output voltage. Finally, the resulting signal is applied to the switch and the main transformer to control the output.

Conclusion

SP6652EB is a robust and cost-effective evaluation board designed to exploit SP6652EB Green Mode PWM controller. This evaluation board offers a high power density and low EMI, and optimized solutions with integrated PFC and PWM, allowing designers to quickly develop different solutions for power supply for LED lighting, home appliance, portable electronics, telecom device and industrial applications. In this article, we explored its application field and explained its working principle.

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