STR-Y6766

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Power Management Integrated Circuit or PMIC is a packaged integrated circuit that provides power management functions with the help of various power electronics depending on the application. In this article, the focus is on STR-Y6766, an offline switcher developed by Sanken for the purpose of regulating AC/DC converters.

The STR-Y6766 is a new generation of non-isolated switching regulator series which is suitable for offline low power applications such as LED lighting, printer and scanner power supply. It is designed to incorporate various features to ensure safe, reliable and efficient operation. It features an integrated PFC, an adjustable On/Off skip timing and Active Burst Mode Control, as well as diagnostic features, external soft start and adjustable current limit. It includes both primary and secondary outputs. The primary output is voltage and the secondary output is current.

The STR-Y6766 operates in two modes, continuous current mode (CCM) and discontinuous current mode (DCM). In CCM, the output voltage is kept in regulation while the input voltage is kept constant. The output current is regulated as a function of the input voltage and the output voltage. In DCM, the output voltage is varied as a function of the input voltage and the output voltage.

The STR-Y6766 has two components, the primary side controller and the secondary side driver. The primary side controller is responsible for controlling the power factor and energy efficiency of the converter, while the secondary side driver is responsible for controlling the current and voltage of the converter. The primary side controller is connected to the input, the secondary side driver is connected to the output, and the two are connected together via an isolation transformer. The primary side controller and the secondary side driver communicate to adjust the output voltage and current based on the set parameters.

The STR-Y6766 has multiple protection features for ensuring optimum operation, such as Under-voltage Lockout (UVLO), Current-limit Main Switch (CLMS), Over-current Protection (OCP), Over-voltage Protection (OVP) and Overload Protection (OLP). The OVP feature ensures that the output voltage do not exceed the rated voltage, while OLP prevents the output current exceeding the rated current. OCP prevents over-current condition causing damage to the component or component parts. It also provides diagnostic functions that can be used to monitor and detect the problems the component.

In summary, the STR-Y6766 is an efficient offline switcher which is suitable for low power applications. It offers various protection features and diagnostic functions, used to ensure the safe and reliable operation of the converter. It features an integrated PFC and external soft start, with adjustable On/Off skip timing and Active Burst Mode Control. This makes the STR-Y6766 suitable for applications ranging from LED lighting to printer and scanner power supply.

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