UCC28085P

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PMIC - AC DC Converters, Offline Switchers

The UCC28085P is an integrated offline switcher power management IC with internal high and low side MOSFETs and floating driver circuitry. It operates in the continuous conduction mode (CCM) of the boundary conduction mode (BCM). Its low power standby mode helps to achieve very low power consumption. It is available in a wide range of operating voltages, output currents and can be used for both AC to DC and DC to DC conversion.

Application Field of UCC28085P

UCC28085P is ideal for a variety of applications such as AC-DC converters, power supplies, dc-dc converters, isolated DC to DC converters, motor drivers, lighting ballasts, and various SMPS applications. It has a low start-up voltage, fast transient response and wide duty cycle range. It is also low loss and provides high efficiency over the full load range.

UCC28085P is suitable for offline applications that have low power consumption requirements such as white goods, home appliances, office automation, and telecom products. It is also suitable for power supplies operating at low frequency with fast dynamic response.

Working Principle

The UCC28085P has three stage operation which makes it a robust device. In the first stage, the MOSFET (M1) is turned “ON” and provides power to the control IC. In the second stage, the internal oscillator begins generating pulses for the switching frequency. Those pulses trigger the power MOSFETs alternately to each other. This helps in the generation of output voltage. In the third stage, the UCC28085P controls the switching frequency and applies the necessary switching duty cycle to maintain the output voltage.

The UCC28085P also includes additional features such as under voltage protection, output current limit, thermal protection and hiccup mode for short circuit protection. With these features, it is able to maximize power efficiency, reduce power consumption, and ensure safe operation of the device.

The device works with a wide range of input voltages, can survive a wide range of defects and extreme conditions, and is designed to have good noise immunity. This makes it ideal for applications requiring high power stability and reliability.

In summary, the UCC28085P is a versatile, low power offline switcher power management IC suitable for a variety of applications. It has a low start up voltage, fast transient response, wide duty cycle range and is low loss for high power efficiency. The built in protection features and excellent noise immunity make it reliable and suitable for demanding applications.

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