FAN6756 Datasheet PDF - Fairchild Semiconductor

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FAN6756
Fairchild Semiconductor

Part Number FAN6756
Description PWM Controller
Page 20 Pages


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January 2013
FAN6756— mWSaver™ PWM Controller
Features
Single-Ended Topologies, such as Flyback and
Forward Converters
mWSaver™ Technology
- Achieves Low No-Load Power Consumption:
< 30 mW at 230 VAC (EMI Filter Loss Included)
- Eliminates X Capacitor Discharge Resistor Loss
with AX-CAP® Technology
- Linearly Decreases Switching Frequency to
23 kHz
- Burst Mode Operation at Light-Load Condition
- Impedance Modulation in “Deep” Burst Mode
- Low Operating Current (450 µA) in Deep Burst
Mode
- 500 V 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 7 ms 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)
Description
The FAN6756 is a next-generation Green Mode PWM
controller with innovative mWSaver™ technology, which
dramatically reduces standby and no-load power
consumption, enabling compliance with 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. “Deep” Burst 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 the power system
in various abnormal conditions. A proprietary frequency-
hopping function 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. The proprietary internal line
compensation ensures constant output power limit over
the 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.
Applications
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.
Related Resources
Evaluation Board: FEBFAN6756MR_T03U065A
Ordering Information
Part Number
Protections(1)
Operating
OLP OVP OTP SSCP Temperature Range
Package
Packing
Method
FAN6756MRMY
FAN6756MLMY
A/R L
LL
L
L
A/R
A/R
-40 to +105°C
8-Pin, Small Outline
Package (SOP)
Tape & Reel
Note:
1. A/R = Auto Recovery Mode protection, L = Latch Mode protection.
© 2011 Fairchild Semiconductor Corporation
FAN6756 • Rev. 2.0.0
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/

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