UCC38C44DR Integrated Circuits (ICs)

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The UCC38C44DR is a current-mode-controlled, PWM/PFM(pulse-width modulation plus pulse frequency modulation) switching converter. It is a member of the internally compensated fixed-frequency off-line switcher family of power management integrated circuits (PMICs). Internally the UCC38C44DR includes a high-performance current-mode Pulse-Width Modulator (PWM) on-time control and a fault protection section in one IC.

This type of IC is designed for high-volume AC-DC converter applications. Its multi-function feature allows it to be used in many DC-DC converters such as buck, boost, flyback, forward, and buck-boost. It is suitable for various applications that require an off-line switcher, including power supplies for adapters, smart phones, TV, projector, and camera.

The UCC38C44DR can operate in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). It uses current-mode control to provide excellent load and line regulation, low noise, and fast transient response. Current limits are set by the external components and current sensing resistor, making it ideal for low power applications. The dead-time compensation can be adjusted to minimize switch losses while maintaining stability.

The package includes an adjustable precision current limit pulse-by-pulse current limit circuit that protects the IC to prevent over-current damage. The current limit circuit can also be used to optimize the switch loss under full load conditions. The integrated thermal compensation circuit keeps the switching frequency of the output stage constant over a wide temperature range.

The UCC38C44DR integrates full protection functions to ensure high reliability. The package includes a built-in VCC undervoltage lockout circuit with fast start-up response, enabling it to be used directly with a low-voltage DC power-source. It also integrates over-current protection, over-voltage protection, and output short-circuit protection.

In summary, the UCC38C44DR is an ideal choice for many AC-DC and DC-DC converters. It provides protection as well as excellent performance with minimal external components. It is suitable for use in power supplies for adapters, smartphones, TV, projector, and camera.

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