Fairchild Manuals

This application note introduces the features of FAN6791 and shows how to design a high-performance power supply.

This application note describes a design strategy for a high- efficiency, compact flyback converter. Design considerations, mathematical equations, and guidelines for a printed circuit board layout are presented.

This application note describes a detailed design strategy for a high-efficiency, compact flyback converter. Design considerations, mathematical equations, and guidelines for a Printed-Circuit-Board (PCB) layout are presented.

SG6902 is a controller designed for power supplies that consist of boost PFC and flyback PWM. It requires few external components to achieve green-mode operation and versatile protections and compensations. The proprietary interleave switching synchronizes the PFC and PWM stages and reduces switching noise. At light loads, PFC stage is turned off to save power and the PWM switching frequency increases.

This application note describes a detailed design strategy for a high-efficiency, compact flyback converter. Design considerations, mathematical equations, and guidelines for printed circuit board layout are presented.

AN-6858 is a Fairchild Semiconductor application note that describes a detailed design strategy for a high-efficiency, compact flyback converter. The note presents design considerations, mathematical equations, and guidelines for printed circuit board layout.

SG6742ML/MR is a highly integrated green-mode PWM controller with features including high-voltage startup, low operating current, linearly decreasing PWM frequency, frequency hopping to reduce EMI emission, fixed PWM frequency, peak-current-mode control, etc.

The SG6846A is a highly integrated green-mode PWM controller that features low startup current (8µA), low operating current (3.7mA), peak-current mode of operation with cycle-by-cycle current limiting, PWM frequency continuously decreasing with burst mode at light loads, VDD over-voltage protection (OVP), AC input brownout protection with hysteresis, constant output power limit (full AC input range), internal latch circuit for OVP, OTP, and OCP, two-level OCP delay (1600ms), output short-circuited delay time 100ms, programmable PWM frequency with frequency hopping, OCP threshold is half peak current limit, feedback open-loop protection with 1700ms delay, and built-in soft-start.

SG6846B is a highly integrated green-mode PWM controller with features such as low startup current, low operating current, peak-current mode operation, cycle-by-cycle current limiting, burst mode at light loads, VDD over voltage protection, AC input brownout protection, etc.

SG6858 is a low-cost, green-mode, PWM controller for flyback converters introduced by Fairchild Semiconductor Corporation.

SG6859A is a low cost, green-mode PWM controller from Fairchild Semiconductor Corporation. It is designed for applications such as battery chargers and power adapters.

The SG6741 is a highly integrated green-mode PWM controller with features including high-voltage startup, low operating current, linearly decreasing PWM frequency, reduced EMI emission, peak-current-mode control, etc.

SG5842A/SG5842JA is a highly integrated green-mode PWM controller. It features low startup current, low operating current, programmable PWM frequency with hopping (SG5842JA), peak-current-mode control, cycle-by-cycle current limiting, synchronized slope compensation, leading-edge blanking (LEB), constant output power limit, totem-pole output with soft driving, VDD over-voltage protection (OVP), programmable over-temperature protection (OTP), internal latch circuit (OTP, OVP), internal open-loop protection, and VDD under-voltage lockout (UVLO). It is suitable for general-purpose switch-mode power supplies and flyback power converters, including notebook power adapters and open-frame SMPS.

The FAN7602C is a green current-mode PWM controller manufactured by Fairchild Semiconductor Corporation. It is specially designed for offline adapter applications, DVDP, VCR, LCD monitor applications and auxiliary power supplies. The device has an internal high-voltage startup switch and burst mode operation, which can reduce the power loss in standby mode. Therefore, when the input line voltage is 265VAC and the load is 0.5W, the input power is less than 1W. Under no-load condition, the input power is under 0.15W. Using the power limit function, the maximum power can be limited constantly, regardless of the line voltage change. The switching frequency is not fixed and it has random frequency fluctuation. The FAN7602C includes various system-related protections, including undervoltage protection, overload protection, overvoltage protection and overtemperature protection.