UCC38051D

Series:	--
Packaging:	Tube
Part Status:	Active
Mode:	Discontinuous (Transition)
Frequency - Switching:	200kHz
Current - Startup:	75µA
Voltage - Supply:	12 V ~ 18 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	UCC38051

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<p>Power factor correction (PFC) is an important feature of modern power supply systems. It is used to reduce the amount of power wasted in the conversion of AC power to DC power. The UCC38051D is a single-stage PFC controller that allows for a high-efficiency, cost-effective solution for power factor correction.</p><p>The UCC38051D is a single-stage PFC controller specifically designed for the offline, continuous-conduction-mode, boost PFC converter. It features a wide input voltage and a high power factor corrector. The device integrates a dedicated current controlled and voltage controlled oscillator (CC&VCO), as well as a low-power-consumption flip-flop-style gate control unit (GCU). The integrated PFC controller with no secondary winding-power disconnection feature offers high efficiency and superior line voltage change tolerance.</p><p>The UCC38051D has two operating modes: continuous current mode (CCM) and discontinuous current mode (DCM). In CCM, the average inductor current is constant and the peak of the inductor current is much higher than the average current. In DCM, the inductor current is gated to maintain a specified current limit. In either mode, the device compensates for the input voltage variations and the output power stage of the power supply.</p><p>The working principle of the UCC38051D is based on the principle of a boost converter, where a current source is used to drive the power switch, typically a MOSFET, to control its conduction time in each switch cycle. The variable conduction time results in a variable amplitude of the output voltage as the inductor current is pulsed. The PFC controller adjusts the conduction time of the switch such that the output voltage meets a specified target (called the “target voltage”).</p><p>The UCC38051D offers a maximum output current of 10A, an output voltage of up to 350V and a switching frequency of up to 500kHz. It also features a high tolerance to input voltage variations and superior line voltage change tolerance. The device includes an adjustable over-voltage protection (OVP) and adjustable over-current protection (OCP) circuits. The on-chip oscillator has a wide frequency range, allowing for a wide range of power supply design.</p><p>The UCC38051D is designed to be used in high-efficiency charging power applications such as LED lighting and white goods. It is used in offline boost PFC converters, where it is necessary to reduce the power Waste and improve the power factor. Its built-in protections, such as the OVP and OCP, help protect the power supply from any fault conditions, such as short-circuit or over-current.</p><p>In conclusion, the UCC38051D is a single-stage PFC controller specifically designed for the offline, continuous-conduction-mode, boost PFC converter. It provides high efficiency power conversion and superior line voltage change tolerance. It is widely used in high-efficiency applications such as LED lighting and white goods, due to its build-in protections and wide input voltage range.</p>

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