TOP245F

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PMIC products are used in Application Specific Integrated Circuits (ASICs) and Application Specific Standard Products (ASSPs). As the name implies, PMIC products are designed to provide power solutions to specific application areas. These power solutions can be either AC to DC (ACDC) converter solutions or offline switcher solutions. This article will discuss the application field and working principle of the TOP245F, an ACDC converter and offline switcher from Power Integrations company.

TOP245F Design Objective and Applications

The TOP245F\'s design objective is to provide an ac-dc power supply solution in consumer electronics that are smaller, more efficient, and more cost-effective than traditional brick solutions. The TOP245F is designed to support a wide range of consumer product needs. These include LED lighting, white-goods, display, general consumer electronics and industrial control applications.

The TOP245F supports a wide range of consumer products due to its range of features. These features include high efficiency, low EMI, excellent thermal design, low component count and robust protection. These features enable the TOP245F to provide a solution suitable for both indoor and outdoor consumer electronics applications.

TOP245F Working Principle

The TOP245F ACDC converter uses two components to convert AC to DC. Firstly the mains voltage is rectified by a diode bridge and then the DC output is filtered and regulated by an active switch mode power supply (SWPS). The mains voltage is rectified to DC by the diode bridge, and then the DC output is filtered by an inductor and capacitor filter. The active switch consists of a MOSFET switch and an oscillator, which control the voltage present at the output of the filter. The MOSFET switch is operated in an on/off mode, while the oscillator controls the frequency of the switching of the MOSFET switch. This in turn controls the output voltage of the filter.

The TOP245F offline switcher is a pulse width modulation (PWM) converter, which uses a high frequency H-bridge for its power switch. The PWM is used to control the on/off switching of the power switch, in order to regulate the output voltage of the switcher. This is done by charging and discharging an inductor with the current present. When the load is connected, the power switch keeps turning on and off and the inductor is charged and discharged to maintain the output voltage at the required set level.

Reverse-Current Protection

The TOP245F also offers reverse-current protection, which protects the device from shorts, overvoltage and reverse-current conditions. This reverse-current protection ensures that the device is protected even under extreme overload or short circuit conditions. The features of the TOP245F include a sense pin which can detect voltage or current variations and limit the output current or voltage and in some cases, provide overvoltage protection. This feature enhances system reliability and protects user and equipment.

Summary

The TOP245F is an ACDC converter and offline switcher from Power Integrations, designed to provide a solution to a wide range of consumer product needs. The TOP245F provides high efficiency, low EMI, excellent thermal design, low component count and robust protection. The TOP245F ACDC converter uses a diode bridge for rectification and an active switch mode power supply for filtering and regulation. The TOP245F offline switcher uses a PWM to control the on/off switching of a power switch, in order to regulate the output voltage. The TOP245F also offers reverse-current protection, which ensures system reliability and user and equipment protection.

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