Industrial

Introduction to the structure and working principle of power MOSFETs and its applications

AN-8026 / FEB301_FAN9611 / FAN9612 User Guide is the user guide for FAN9611 / FAN9612 400W evaluation board for interleaved boundary-conduction mode power factor corrected supply.

This application note shows the step-by-step process to design a high-performance supply. The equations shown in this document can also be used for different output voltages and total power. The complete power supply circuits shown in Figures 6 and 7 demonstrate the FAN4800’s ability to manage high output power while complying with international requirements regarding AC line quality. The PFC section provides 380VDC to a dual-transistor current-mode forward converter. The output of the converter delivers +12V at up to 8.4 amps. The circuit operates from 85 to 265VAC with both power sections switching at 100kHz. The FAN4800 is initialized once C12 is charged to 13V through R27 and R28. PFC switching action boosts the voltage on C5 to 380V via L1’s inductance. T2 then supplies a well-regulated 13V for the FAN4800 from its secondary winding. T2’s primary-to-secondary turns ratio (NPRI / NSEC) is 18.8:1. For proper circuit operation, high-frequency bypassing with low-ESR ceramic or film capacitors on VCC and VREF is provided. Orderly PFC operation upon start-up is achieved when D2 quick charges the boost capacitor to the peak AC line voltage before the boost switch Q1 is turned on. This ensures the boost inductor current is zero before IEAO RAMP2.

ATS177 is an integrated Hall effect latched sensor designed for electronic commutation of brush-less DC motor applications. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a schmitt trigger to provide switching hysteresis for noise rejection, and open-collector output.

FAN4810 is a controller IC for PFC power supply design. This application note describes the theory of operation and step-by-step process to design a high performance Power Factor Corrected (PFC) power supply using the FAN4810 controller IC.

This is the PFCM design guide of FAIRCHILD SEMICONDUCTOR, which introduces the PFCM system configuration, protection circuits, design examples, experimental results.

This application note provides a primary-side synchronous rectification (SR) trigger solution for dual-forward converter (PFC). The solution employs the FAIRCHILD FAN6210 SR controller, which controls the FAN6206 SR driver to achieve low conduction loss SR, and to reduce the overall power loss of PFC.

This is an application note that describes how to design a power factor correction circuit using FAN7529

This application note introduces the FAN7527B's features and characteristics, including the internal circuit structure, working principle and application circuits.

This document describes how to reduce switching losses in a step-up converter using QFETs

This application note describes a power factor correction (PFC) circuit design using the FAN7530. The circuit operates in the critical conduction mode (CRM).

This application note illustrates ways in which QFET power MOSFETs may be used in switched mode power supplies. It describes a 100KHz, 180W simple off-line power supply with three regulated DC voltages.

The FAN7527 is an active power factor correction (PFC) controller for boost PFC application which operates in the critical conduction mode. It turns on MOSFET when the inductor current reaches zero and turns off MOSFET when the inductor current meets the desired input current reference voltage as shown in Fig. 1. In this way, the input current waveform follows that of the input voltage, therefore a good power factor is obtained.