UCC3818APWRG4

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Mode:	Average Current
Frequency - Switching:	6kHz ~ 220kHz
Current - Startup:	150µA
Voltage - Supply:	12 V ~ 17 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	UCC3818A

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UCC3818APWRG4: Power Factor Correction

The UCC3818APWRG4 is a highly efficient Power Factor Correction (PFC) controller originally made by Texas Instruments. It is an integrated MOSFET driver that operates in continuous conduction mode (CCM). The UCC3818APWRG4 features a combined error amplifier, frequency hopping current limiting, and overvoltage protection (OVP) functions. The device integrates a programmable soft start timer, providing an easy solution to meet the dynamic power factor correction requirement of various kinds of power factor correction systems.PFC is a technology that converts AC input power from the wall into a sinusoidal DC output voltage, decreasing voltage input harmonic distortion and efficiently utilizing power generated in the power conversion process. Power factor correction is used to optimize the energy efficiency of electrical apparatuses such as AC motors, welding equipment, and satellite communication communication systems.The UCC3818APWRG4 operates in continuous conduction mode (CCM), in which the average current of the MOSFET is kept constant for an applied voltage. In this way, good switching power is achieved. The PFC current limit and the minimization of the peak inductor current ripple significantly reduce the input current distortion, lowering the switching losses, and improving system efficiency.When operating in CCM, the controller adjusts the duty cycle based on the measurement of the inductor current and output power. During the start-up, the controller ramps up slowly, allowing the system to reach a steady state. The built-in oscillator provides a frequency hopping power limit that adds protection against current spikes.The built-in OVP circuit prevents the system from entering an overvoltage condition, with the OVP threshold set by the OVP pin voltage. The maximum voltage limit can be set using an external resistor divider, and a large range of overvoltage trip points can be chosen. The UVLO threshold ensures that the controller is disabled until the input voltage is within the specified range.The UCC3818APWRG4 provides an easier and cost-effective solution to various kinds of power factor correction systems, due to its integrated functions and system protection circuits. It offers improved efficiency, current limit protection, and stability, achieving higher overall system performance. This makes the UCC3818APWRG4 a popular choice for higher power PFC applications.

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