FAN6961SZ Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Mode:	Discontinuous Conduction (DCM)
Frequency - Switching:	60kHz
Current - Startup:	10µA
Voltage - Supply:	13.5 V ~ 24.5 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOP
Base Part Number:	FAN6961

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Introduction

Power Factor Correction (PFC) is an important technology for proper and efficient power management in the modern world. To reduce energy losses due to harmonics, modern power systems need to be designed using PFC principles. FAN6961SZ is a Switch-Mode PFC IC from Fairchild Semiconductor that provides power factor correction and power line protection in various AC application and is designed for an array of applications.

FAN6961SZ Application Field and Working Principle

FAN6961SZ is suitable for applications like AC/DC adapters, AC/DC switching power converters, and Line-Regulated Converters, which require power factor correction. It is a high-performance PFC controller featuring integrated Fixed Frequency, Voltage Mode Control, reduced-component-count design, and wide voltage range operation. The primary function of the FAN6961SZ is power-factor correction as well as to reduce harmonic distortion in the mains voltage. It uses a bridge rectifier with an inductor (Ls) and a power capacitor (Cf) as the power stage at its input. The inductor is used to filter out components below line frequency, while the capacitor is designed to reduce harmonic components at the output. The FAN6961SZ uses a voltage-mode control architecture and has an integrated operational amplifier for the comparison of actual voltage and reference voltage. The current sensed by the resistor (Rs) is compared to a triangular waveform for controlling the switching of the power MOSFET bridge. This architecture provides a high power factor and low harmonic distortion. The FAN6961SZ also has an adjustable line feedforward path in order to increase the control loop gain. This increases the fast line transient response and reduces the total harmonic distortion even at low load. The FAN6961SZ also features an auto-restart function in case of over-current or short-circuit protection.

Conclusion

Power factor correction is a crucial technology in today\'s modern power systems and FAN6961SZ provides an efficient PFC solution. It helps the power system to reach a high power factor and low harmonic distortion at the load end. The FAN6961SZ uses a voltage-mode control architecture, shared adjustable line feedforward path, and up to 50°C junction temperature operation. It provides over-current and short-circuit protection with auto-restart feature, making it an excellent solution for AC/DC adapters and AC/DC switching power converters.

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