KA5M0280RYDTU

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KA5M0280RYDTU application field and working principle

The KA5M0280RYDTU is a 3-terminal off-line quasiresonant switching regulator, with a high voltage MOSFET integrated. It offers high stability and cost effectiveness. Specifically, this device can be operated up to 500mA in continuous mode, providing a constant output voltage.

Applications

• Switched mode power supply (SMPS)
• AC DC converter
• LED lighting applications
• Telecommunication and computer adapters/power supplies
• Battery chargers

Working Principle

The KA5M0280RYDTU is configured in a quasi-resonant Boost TOPology, which is suitable for universal AC line voltage applications. It consists of two stages: the primary stage, which is a voltage-controlled oscillator (VCO) that generates a frequency that becomes regulated by the output voltage, and the secondary stage is a synchronous rectification of the output voltage. The working frequency depends on the resonant mode, the voltage at which switching over from primary current to secondary current occurs, and the ripple on the output voltage.

The VCO generates a series of pulses that are used to construct the buck type voltage waveforms. The average output voltage of the VCO is locked to the average of the VCO output by the secondary output voltage. The VCO output pulses are shaped by cascading a logic OR gate and a logic AND gate circuit. The output of the logic OR gate is used to control the gate voltage of the MOSFETs, resulting in a quasi-resonant circuit. This ensures that the average current of the MOSFETs is regulated, thus providing a constant output voltage.

The VCO input is provided by a sawtooth feedback signal that is proportional to the output voltage. The input is regulated by the VCO feedback capacitor. If the value of the VCO feedback capacitor is too large, then the output voltage will be low. Similarly, if it is too small, then the output voltage will be high. This provides flexibility in regulating the output voltage of the KA5M0280RYDTU.

Conclusion

The KA5M0280RYDTU is a 3-terminal off-line quasiresonant switching regulator, designed for universal AC line voltage applications. It offers high stability and cost effectiveness up to 500mA in continuous mode, providing a constant output voltage. This device can be widely used for switched mode power supplies, AC DC converters, LED lighting applications, telecommunication and computer adapters/power supplies, and battery chargers.

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