ACT520SH-T

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The ACT520SH-T is a monolithic integrated circuit containing a high voltage integrated switch, overvoltage protection and bias voltage startup circuit. Supreme Semiconductor\'s ACT520SH-T is designed for applications in offline switchers and AC/DC converters operating over a wide input voltage range. The IC provides improved efficiency and simplified board layout by integrating its functions onto a single chip. It also includes several features to maximize system performance and improve EMC performance.

The primary applications of the ACT520SH-T are switching power supplies, including those for fluorescent lighting systems. The switch, overvoltage protection (OVP) and bias startup functions are all integrated into a single chip. The integrated switch controls the switching of the power supply from standby to normal operating mode. The OVP function is designed to protect the switching circuit from high voltage that may be applied by input voltage fluctuations. The bias voltage startup circuit provides power to the control logic of the switching circuit.

The working principle of the ACT520SH-T is based on the power MOSFET (metal-oxide-semiconductor field-effect transistor) integrated switch. The power MOSFET switches on and off at varying rates to efficiently regulate the voltage applied to the load. The output voltage is sensed and monitored by the control logic of the device, which in turn adjusts the switching frequency of the MOSFET. When the input voltage rises to a certain level, the OVP circuit will kick in and reduce the power reaching the load. The startup circuit is responsible for supplying the control logic with a steady and constant bias voltage.

The ACT520SH-T also features constant voltage control, input reverse voltage protection, over temperature protection, and soft-start functions. Constant voltage control ensures that the output voltage is regulated within a specific range, even when subjected to large changes in load current. Input reverse voltage protection is designed to protect the device from damage caused by reversed power connections. Over temperature protection is designed to protect the device from overheating, which can cause damage to the IC. Soft-start ensures that the IC will start up slowly in order to prevent load damage.

In conclusion, the ACT520SH-T offers an integrated solution for AC/DC converters and offline switchers. It combines the switching, overvoltage protection and bias voltage startup functions in a single chip. The IC benefits from features such as constant voltage control, input reverse voltage protection, over temperature protection, and soft-start. The application of the ACT520SH-T is a great option for achieving improved efficiency and simplified board layout, as well as enhanced system performance and improved EMC performance.

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