Fairchild公司的FSB127H是满足2013 ErP Lot 6待机功率法规的绿色模式功率开关, 在单一封装解决方案中集成有先进的电流模式脉宽调制(PWM)和耐雪崩700V SenseFET.器件采用飞兆半导体的mWSaverTM技术，能够大幅降低待机功耗和无负载功耗，可以帮助设计人员解决实现低于0.5W待机模式功耗的难题。主要用在PC,服务器,LCD TV和游戏控制器的辅助电源, VCR, SVR, STB, DVD和DVCD,打印机和扫描仪的SMPS,通用适配器等.本文介绍了FSB127H主要特性,方框图, 典型反激应用电路和典型应用电路图.

The FSB127H is a next-generation, green-mode Fairchild Power Switch (FPS™) incorporating Fairchild’s innovative mWSaver™ technology, which dramatically reduces standby and no-load power consumption, enabling conformance to all worldwide Standby Mode efficiency guidelines. It integrates an advanced currentmode pulse width modulator (PWM) and an avalancherugged 700V SenseFET in a single package, allowing auxiliary power designs with higher standby energy efficiency, reduced size, improved reliability, and lower system cost than previous solutions.

Fairchild Semiconductor’s mWSaver™ technology offers best-in-class minimum no-load and light-load power consumption. An innovative Ax-CAP™ method, one of the five proprietary mWSaver™ technologies, minimizes losses in the EMI filter stage by eliminating the X-cap discharge resistors while still meeting IEC61010-1 safety requirement. mWSaver™ Green Mode gradually decreases switching frequency as load decreases to minimize switching losses.

A new proprietary asynchronous jitter decreases EMI emission and built-in synchronized slope compensation allows stable peak-current-mode control over a wide range of input voltage. The proprietary internal line compensation ensures constant output power limit over entire universal line voltage range.

Requiring a minimum number of external components, FSB127H provides a basic platform that is well suited for the cost-effective flyback converter design with low standby power consumption.

FSB127H主要特性:

MWSaver™ Technology

 Achieve Low No-Load Power Consumption Less than 40mW at 230VAC (EMI Filter Loss Included)

 Meet 2013 ErP Standby Power Regulation (Less than 0.5W Consumption with 0.25W Load) for ATX Power and LCD TV Power

 Eliminate X-Cap Discharge Resistor Loss with Ax-CAP™ Technology

 Linearly Decreased Switching Frequency at Light- Load Condition and Advanced Burst Mode Operation at No-Load Condition

 700V High-Voltage JFET Startup Circuit to Eliminate the Startup Resistor Loss

Highly Integrated with Rich Features

 Internal Avalanche-Rugged 700V SenseFET

 Built-in 10ms Soft-Start

 Peak-Current-Mode Control

 Cycle-by-Cycle Current Limiting

 Leading-Edge Blanking (LEB)

 Synchronized Slope Compensation

 Proprietary Asynchronous Jitter to Reduce EMI

Advanced Protection

 Internal Overload / Open-Loop Protection (OLP)

 VDD Under-Voltage Lockout (UVLO)

 VDD Over-Voltage Protection (OVP)

 Constant Power Limit (Full AC Input Range)

 Internal Auto Restart Circuit (OLP, VDD OVP, OTP)

 Internal OTP Sensor with Hysteresis

 Adjustable Peak Current Limit

FSB127H应用:

General-purpose switched-mode power supplies and flyback power converters, including:

 Auxiliary Power Supply for PC, Server, LCD TV, and Game Console

 SMPS for VCR, SVR, STB, DVD, and DVCD Player, Printer, Facsimile, and Scanner

 General Adapter

 LCD Monitor Power / Open-Frame SMPS

图1. FSB127H方框图

图2. FSB127H典型反激应用电路


图3. FSB127H典型应用电路图

图4. FSB127H变压器电路
详情请见:
http://www.fairchildsemi.com/ds/FS/FSB127H.pdf