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FAN6751

Fairchild Semiconductor
Part Number FAN6751
Manufacturer Fairchild Semiconductor
Description Highly Integrated Green-Mode PWM Controller
Published Nov 10, 2013
Detailed Description www.fairchildsemi.com AN-6073 FAN6751 — Highly Integrated Green-Mode PWM Controller Introduction This application note ...
Datasheet PDF File FAN6751 PDF File

FAN6751
FAN6751

Overview
www.
fairchildsemi.
com AN-6073 FAN6751 — Highly Integrated Green-Mode PWM Controller Introduction This application note describes a detailed design strategy for a high-efficiency, compact flyback converter.
Design considerations and mathematical equations are presented as well as guidelines for a printed circuit board layout.
The highly integrated FAN6751 series of PWM controllers provides several features to enhance the performance for LCDM/TV, NB, and adapters.
The green-mode function includes off-time modulation and burst mode to reduce the PWM frequency at light-load and in no-load conditions.
To avoid acoustic noise problems, the minimum PWM frequency is set above 18KHz.
This greenmode function enables the power supply to meet international power conservation requirements.
With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated.
Built-in synchronized slope compensation achieves stable peak-current-mode control.
The proprietary external line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC.
FAN6751 provides many protection functions, as shown in Table 1.
In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output short-circuit failure occur.
ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Internal Open-loop Protection GATE Output Maximum Voltage Clamp: 18V VDD Under-Voltage Lockout (UVLO) VDD Over-Voltage Protection (OVP) Internal Recovery Circuit (OVP, OLP) Internal Sense Short-Circuit Protection External Constant Power Limit (Full AC Input Range) Internal OTP Sensor with Hysteresis Built-in 5ms Soft-Start Function Built-in VIN Pin Pull HIGH (> 4.
7V) Recovery Function for Second-Side Output OVP Brownout Protection with Hysteresis Applications General-purpose, switch-mode power supplies and flyback power converters, including: ƒ ƒ ƒ Power Adapters Open-frame SMPS LCD Monitor/TV SOP-8 GND FB NC HV 1 2...


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