關鍵詞： Fairchild , FAN6756 , 筆記本 , 電源

Fairchild 公司的FAN6756是采用創新mWSaver™技術的綠色模式PWM控制器,能大大地降低待機和無負載功耗,滿足世界范圍的待機模式效率指引.在230VAC時待機和無負載功耗為30mW(包括EMI濾波器功耗),具有多種保護如過載/開路保護(OLP),UVLO,VDD OVP,超溫保護(OTP)和電流檢測短路保護(SSCP),主要用于筆記本電腦,打引機,LCD監視器,游戲機控制臺.本文介紹了FAN6756主要特性,方框圖,典型應用電路以及FAN6765MR評估板指標,電路圖,材料清單和PCB元件布局圖.

The FAN6756 is a next-generation Green Mode PWM controller with innovative mWSaver™ technology, which dramatically reduces standby and no-load power consumption, enabling conformance to worldwide Standby Mode efficiency guidelines.

An innovative AX-CAP™ method minimizes losses in the EMI filter stage by eliminating the X-cap discharge resistors while meeting IEC61010-1 safety requirements. Standby Mode clamps feedback voltage and modulates feedback impedance with an impedance
modulator during Burst Mode operation, which forces the system to operate in a “deep” Burst Mode with minimum switching losses.

Protections ensure safe operation of power system in various abnormal conditions. Proprietary frequencyhopping function decreases EMI emission and built-in synchronized slope compensation allows more stable Peak-Current-Mode control over wide range of input voltage and load conditions. The proprietary internal line compensation ensures constant output power limit over entire universal line voltage range.

Requiring a minimum number of external components, FAN6756 provides a basic platform that is well suited for cost-effective flyback converter designs that require extremely low standby power consumption.

FAN6756主要特性:

 Single-Ended Topologies, such as Flyback and Forward Converters

 mWSaver™ Technology

- Achieves Low No-Load Power Consumption:

Less than 30mW at 230VAC (EMI Filter Loss Included)

- Eliminates X Capacitor Discharge Resistor Loss with AX-CAP™ Technology

- Linearly Decreases Switching Frequency to 23KHz

- Burst Mode Operation at Light-Load Condition

- Impedance Modulation in Standby Mode for “Deep” Burst Mode Operation

- Low Operating Current (450μA) in Standby Mode

- 500V High-Voltage JFET Startup Circuit to Eliminate Startup Resistor Loss

 Highly Integrated with Rich Features

- Proprietary Frequency Hopping to Reduce EMI

- High-Voltage Sampling to Detect Input Voltage

- Peak-Current-Mode Control with Slope Compensation

- Cycle-by-Cycle Current Limiting with Line Compensation

- Leading Edge Blanking (LEB)

- Built-In 8ms Soft-Start

 Advanced Protections

- Brown-In/Brownout Recovery

- Internal Overload/Open-Loop Protection (OLP)

- VDD Under-Voltage Lockout (UVLO)

- VDD Over-Voltage Protection (VDD OVP)

- Over-Temperature Protection (OTP)

- Current-Sense Short-Circuit Protection (SSCP)

FAN6756應用:

Flyback power supplies that demand extremely low standby power consumption, such as:

 Adapters for Notebooks, Printers, Game Consoles, etc.

 Open-Frame SMPS for LCD TV, LCD Monitors, Printer Power, etc.

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圖1.FAN6756方框圖

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圖2.FAN6756典型應用電路圖

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圖3.FAN6756 65W筆記本電腦電源電路圖

FAN6765MR評估板

This user guide supports the evaluation kit for the FAN6765MR.This document describes a 65W power supply using FAN6756MR. The FAN6756MR mWSaver™ controller targets power adapters that demand extremely low standby power consumption. With innovative mWSaver™ technology, FAN6756MR dramatically reduces standby and no-load power consumption. The AX-CAP™ technology minimizes losses in the EMI filter stage by eliminating the X-cap discharge resistors while meeting IEC61010-1 safety requirements. Standby Mode switches feedback impedance during Burst Mode operation, which forces the system to operate in a “Deep” Burst Mode with minimum switching losses. Proprietary asynchronous jitter decreases EMI emission and built-in synchronized slope compensation allows more stable Peak-Current-Mode control over a wide range of input voltage and load conditions.

FAN6765MR評估板指標:

2012-8-23 13:34:13 上傳

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