UCC38500DWTRG4

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• Introduction to PMIC - PFC (Power Factor Correction)

Power factor correction (PFC) is an important technology used in modern power supplies since it eliminates the need for other components such as inductors, capacitors, and resistors previously used in power supplies to correct the power factor. Compensation of the power factor helps to reduce the idle current flow, reduce the peak current drawn from the utility transformer, increase the power transfer efficiency, minimize the amount of reactive power and increase the power transfer efficiency.

PFC can be divided into two main categories: Passive PFC and Active PFC. Passive PFC involves the use of inductors and capacitors in a power supply, whereas Active PFC involves the use of an electronic control system, usually consisting of integrated circuits, to increase the power factor. The most common Active PFC technologies are Pulse Width Modulation (PWM) and Burst Mode (BM).

• UCC38500DWTRG4 application field and working principle

The UCC38500DWTRG4, developed by Texas Instruments, is a power factor correction IC for AC/DC power supplies. This device implements the PFC topology called Discontinuous Conduction Mode (DCM) and features peak current detection and leading-edge modulation for improved PF and line-valid regulation.

The UCC38500DWTRG4 is a single-phase bridge PFC controller that consists of a voltage reference, an error amplifier, a bridge current sense amplifier and a PWM converter section. The input voltage is monitored with a voltage divider circuit and then compared to the internally generated reference voltage of 5.1 V in order to detect any voltage drop or over-voltage situation. The error amplifier is responsible for converting the voltage difference signal into a current signal which is then amplified by the bridge current sense amplifier.

The PWM converter section contains comparators and logic circuits which produce an output signal based on the input voltage and current sensed by the bridge current sense amplifier. The PWM output signal is used to drive a power MOSFET switch for output power regulation.

The UCC38500DWTRG4 can be used in a variety of applications including notebook and desktop power supplies, uninterrupted power supplies, off-line converters, LCD/plasma television and display power supplies, lighting ballasts and LED drivers. The UCC38500DWTRG4 is suitable for applications requiring tight regulation and high efficiency, and is the perfect choice for designs where high levels of performance, reliability and easy implementation are required.

• Conclusion

The UCC38500DWTRG4 is a highly integrated PFC IC designed for AC/DC applications. It is designed to provide high efficiency, with peak current detection and leading-edge modulation, and is suitable for a variety of applications including notebook and desktop power supplies, uninterrupted power supplies, off-line converters, and more. It is the perfect solution for designs where maximum performance, reliability and ease of implementation are required.

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