UCC38C44DGK

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UCC38C44DGK Application Field and Working Principle

UCC38C44DGK is a low power, high performance off-line AC/DC or DC/DC converter with an adjustable frequency of up to 100kHz. It is an integrated circuit with power MOSFETs and controllers, providing a low-cost solution for AC/DC or DC/DC conversion. As such, it belongs to the group of PMIC (Power Management Integrated Circuits). This product range includes AC DC Converters, Offline Switchers, Reference and Current Regulation Devices, Buck and Boost Regulators, Linear Voltage Regulators, Voltage Controllers, and Off-Line Controllers.

UCC38C44DGK is ideal for cost effective, high efficiency applications, such as household appliances and other similar low power devices. It features Peak Current Mode Control loop with cycle by cycle current limit and protection circuit, providing excellent line and load transient response; Dynamic Self-Biasing circuit, supplying a the right gate drives for the power MOSFETs, and the Propagation Delay Resync circuit, allowing the minimum jitter and maintaining the duty cycle within a range of 10% to 90%.

Working Principle

The UCC38C44DGK is an off-line, high-performance AC/DC converter. It operates in peak current mode with a constant frequency.The power MOSFETs operate in a half-bridge circuit with the control loop providing for an excellent line and load transient response. The output voltage is precisely regulated by detecting the current at the primary side output filter inductor. The peak current is sensed by an external NPN transistor.

The gate drive for the power MOSFETs is provided by the Dynamic Self-Biasing circuit. This ensures the right gate drive and the lowest possible switching losses. A PWM comparator and a Sawtooth oscillator generate a fixed frequency triangle waveform and produce a PWM logic signal. The Propagation Delay Resync circuit is used to resynchronize the FET gate and the oscillator to ensure a minimum jitter and keep the duty cycle within a range of 10%-90%.

UCC38C44DGK features Current Limit which protect the power MOSFETs and the output filter components. Additionally, it provides for the demagnetization protection of the inductors.

Application Field

UCC38C44DGK is ideal for cost effective, high efficiency applications, involving AC/DC or DC/DC conversion.It is suitable for producing low power devices, such as household appliances and other similar applications. This chip is used mainly as an AC/DC or DC/DC converter in consumer products like mobile phones, digital cameras, laptops and related equipment.

UCC38C44DGK is also used in modern DC motor drive applications like small electric winches, unmanned aerial vehicles (UAVs), and power line communication systems. The chip enables high efficiency, small size, low cost and easy assembly in those kinds of applications.

Summary

UCC38C44DGK is a low power, high performance off-line AC/DC or DC/DC converter. It belongs to the category of PMIC (Power Management Integrated Circuits), and its applications mainly involve AC/DC or DC/DC conversion. It is ideal for cost effective, high efficiency applications, like household appliances, mobile phones and DC motor drives. This chip ensures low power consumption, a small size and easy assembly when used in the corresponding applications.

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