Fairchild Manuals

This application note introduces FAIRCHILD SEMICONDUCTOR's Tiny-DIP-SPM series products, including product overview, product functions, application scenarios, pin definitions, internal circuits and features, absolute maximum ratings, interface circuits, function and protection circuits, start-up circuits, etc.

QFETs are a new type of MOSFET that offers high efficiency and low losses. They can be used in switch-mode power supply design. This application note compares the key characteristics, power losses, and efficiency of the new QFET and a conventional MOSFET in a 60 watt flyback converter operated at 180 to 265 VAC.

This document introduces the FAN480X PFC+PWM integrated controller from Fairchild Semiconductor Corporation. The controller consists of PFC and PWM controllers. The PFC controller, which uses average current control mode, can achieve higher power factor and lower total harmonic distortion. The PWM controller can be controlled in either current mode or voltage mode. The FAN480X has multiple protection features, including soft-start, over-voltage/under-voltage protection, cycle-by-cycle current limit, and low AC input voltage protection. The product can replace FAN4800 and ML4800.

This application note presents the design guidelines of a single-stage boost converter for LED lighting application. The design utilizes FAN7530, which is a fixed-conduction-time CRM PFC controller with zero-current-detection, valley switching, MOSFET over-current protection, low start-up current (40μA) and low operating current (1.5mA).

This application note describes a typical charger using the PSR controller. Both the features of this controller, as well as the operation of the power supply adaptor, are presented in detail. Based on the proposed design guideline, a design example with detailed parameters is given to demonstrate the superior performance of the controller.

This technical application document explains the design and application of a general charger using a PSR controller. The document details the functionality of the controller and the operation of the power supply. It also provides detailed design examples with parameters to demonstrate the excellent performance of the controller.

This application note presents design considerations for LED lamp systems employing Fairchild Semiconductor components. It includes designing the transformer and output filter, selecting the components, and implementing constant-current control. The step-by-step procedure completes a power supply design. The design is verified through an experiment.

Provides a functional verification method for the FMS6406 evaluation board

This document describes the application of zero voltage crossing optically isolated triac drivers in interface applications. These drivers are low-cost, simple and effective solutions for interfacing between low current DC control circuits such as logic gates and microprocessors and AC power loads (120, 240 or 380 volt, single or 3-phase). They provide sufficient gate trigger current for high current, high voltage thyristors, while providing a guaranteed 7.5 kV dielectric withstand voltage between the line and the control circuitry. An integrated, zero-crossing switch on the detector chip eliminates current surges and the resulting electromagnetic interference (EMI) and reliability problems for many applications. The high transient immunity of 5000 V/µs, combined with the features of low coupling capacitance, high isolation resistance and up to 800 volt specified V DRM ratings qualify this triac driver family as the ideal link between sensitive control circuitry and the AC power system environment. Optically isolated triac drivers are not intended for stand-alone service as are such devices as solid state relays. However, they will replace costly and space demanding discrete drive circuitry having high component count consisting of standard transistor optoisolators, support components including a full wave rectifier bridge, discrete transistor, trigger SCRs and various resistors and...

Introduces an optically isolated phase control circuit

uf4001-uf4007 is a fast rectifier produced by fairchild semiconductor corporation, which has the characteristics of low forward voltage drop, high surge current capability, high reliability and high current capability

S3N is a 3A, 1200V Schottky diode product from Fairchild Semiconductor Corporation. The package form is SMC/DO-214AB. It has the characteristics of low voltage, high impedance, high reverse breakdown voltage, low forward voltage drop, low power consumption, low forward resistance, and fast reverse recovery time.

S3A-S3M is a general purpose rectifier produced by Philips, with features of low ground capacitance, low power consumption and high reliability.

S2A - S2M is a general purpose rectifier produced by Fairchild Semiconductor Corporation, which has the characteristics of easy assembly, low voltage drop, high current and high surge current capacity.