TOP232PN

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TOP232PN is an inexpensive, high-performance off-line Quasi-Resonant converter that is especially suitable for parts of the consumer and industrial markets. It is widely used in the applications of low power AC/DC converters, offline switchers and power supplies.

TOP232PN is suitable for a wide input voltage range, of which the maximum is 375VAC. It is also suitable for a wide output voltage range, of which the maximum is 36V. It features low no-load input power and a fault-protection circuit comprising an overcurrent detector and trip-circuit, overvoltage detector and trip-circuit, and thermal shutdown. Its high power factor, low power loss and low system cost makes it an ideal solution for off-line applications.

TOP232PN Application Field

TOP232PN has wide application fields. It can be used in switching power supplies, uninterruptible power supplies, universal battery chargers, and other similar applications. It is also suitable for applications such as medical equipment, industrial equipment, home appliances, toys, and small power PC. Moreover, it can be used in other off-line power converter applications such as lighting, telecommunication and computer equipment.

TOP232PN Working Principle

TOP232PN is a Quasi-Resonant converter and it switches automatically between two modes. During continuous conduction mode (CCM), the switching device is turned on and it operates at a fixed frequency. In discontinuous conduction mode (DCM), the switches are either in the off state or zero state, thus providing zero voltage and zero current. By combining both operating modes, the power factor can be improved and the switching and conduction loss can be reduced.

The working principle of TOP232PN is mainly based on pulse-width modulation (PWM) control. TOP232PN is a controller driven by driver IC. It offers a peak current mode PWM control with auto-Recovery over-current protection. With synchronized rectifier, highly efficient energy conversion is achieved. The transistor used as a switch is either a power MOSFET or BJT. The PWM control circuit is external to the IC, and the minimum current sense resistor is used to ensure an accurate portion of the feedback signal.

Conclusion

TOP232PN is a reliable and cost-effective off-line Quasi-Resonant converter that is suitable for a wide input and output voltage range. It is mainly used as a power supply for different application fields, such as switching power supplies, uninterruptible power supplies, universal battery chargers, medical equipment, industrial equipment, home appliances, toys, small power PC, and other off-line power converter applications. Its main working principle is based on pulse-width modulation (PWM) control and synchronized rectifier, which provides highly efficient energy conversion.

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