UCC3817AN

Series:	--
Packaging:	Tube
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:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-PDIP
Base Part Number:	UCC3817A

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UCC3817AN Application Field and Working Principle

UCC3817AN is a PMIC (Power Management Integrated Circuit) device. It is specifically designed to provide Power Factor Correction (PFC) operations in power supply systems. The device is suitable for applications where high accuracy or tight regulation of power supply is critical.PFC OverviewA power factor correction (PFC) system is a power system structure that consists of an AC-DC power supply and a DC-DC converter. PFC is the process of correcting the phase displacement between the voltage and the current within an AC-DC power system. This process is used to minimize power losses due to the significant energy dissipation that happens due to the phase angle difference of current and voltage. PFC is used in a range of applications, from power supplies for computers, servers, and inverters, to a range of medical, industrial, and telecom equipment.UCC3817AN Application FieldsUCC3817AN device is ideal for high power PFC applications, including AC-DC systems with universal input ranges up to 600W. It can be used in LED drivers, personal notebook adapters, set-top boxes, large LED lighting systems, and residential appliances. The device incorporates several features that make it suitable for use in harsh environments such as extreme temperatures. It employs a proprietary “Smart Start” technology to ensure smooth, accurate, and quick start-up power supply. The device also features built-in dynamic feed-forward circuitry to ensure good regulation with varied line and load conditions.UCC3817AN Working PrincipleThe working principle of the UCC3817AN is based on synchronous current control, allowing the system to operate without needing external components in the control loop. The feedback voltage from the regulated output and the voltage on the current sense pin are compared with the regulator’s internal reference voltage, and then the error voltage is processed by the error amplifier to generate the control signal for the power switch. This control process results in current waveforms with low harmonic distortion, higher efficiency, and improved power factor.The device also includes a soft start feature, which ensures a smooth and accurate power up process. This feature is typically used to reduce surge current when the system is powered up. During this process, the power switch is enabled slowly in a controlled manner, resulting in a gradual ramp-up of the output voltage. This feature helps to reduce the complexity of the design and increase the reliability of the system.ConclusionUCC3817AN is a PMIC (Power Management Integrated Circuit) device designed to provide power factor correction (PFC) operations in power supply systems. It is suitable for high power applications up to 600W and can be used in LED drivers, personal notebook adapters, set-top boxes, large LED lighting systems, and residential appliances. The device is based on synchronous current control, allowing the system to operate without needing external components in the control loop. It also includes a soft start feature that ensures a smooth and accurate power up process. Overall, UCC3817AN is an ideal solution for high power PFC applications.

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