FairchildFAN675665W筆記本電腦電源解決方案
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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(yīng)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.
圖1.FAN6756方框圖
圖2.FAN6756典型應(yīng)用電路圖
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(biāo):
FAN6765MR評估板主要特性:
? 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 Asynchronous-Jitter 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)
圖4.FAN6765MR評估板外形圖
圖5.FAN6765MR評估板電路圖
FAN6765MR評估板材料清單(BOM):
圖6.FAN6765MR評估板變壓器電路和指標(biāo)圖
圖7.FAN6765MR評估板元件布局圖(頂層)
圖8.FAN6765MR評估板元件布局圖(底層)
詳情請見:
http://www.fairchildsemi.com/ds/FA/FAN6756.pdf
和
http://www.fairchildsemi.com/products/evaluationboards/FEBFAN6756MR_T03U065A.pdf?user-guide=
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