FSDM311A Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Green Mode Fairchild Power Switch (FPS™)

November 2007
FSDM311A
Green Mode Fairchild Power Switch (FPS™)
Features
ƒ Internal Avalanche-Rugged SenseFET
ƒ Precision Fixed Operating Frequency: 67KHz
ƒ Consumes Under 0.2W at 265VAC & No Load with
Advanced Burst-Mode Operation
ƒ Internal Start-up Circuit
ƒ Pulse-by-Pulse Current Limiting
ƒ Over-Voltage Protection (OVP)
ƒ Overload Protection (OLP)
ƒ Internal Thermal Shutdown Function (TSD)
ƒ Auto-Restart Mode
ƒ Under-Voltage Lockout (UVLO) with Hysteresis
ƒ Built-in Soft-Start
ƒ Secondary-Side Regulation
Applications
ƒ Charger & Adapter for Mobile Phone, PDA, & MP3
ƒ Auxiliary Power for White Goods, PC, C-TV, &
Monitors
Description
The FSDM311A consists of an integrated Pulse Width
Modulator (PWM) and SenseFET, and is specifically
designed for high-performance, off-line, Switch-Mode
Power Supplies (SMPS) with minimal external
components. This device is an integrated high-voltage
power switching regulator that combines a VDMOS
SenseFET with a voltage-mode PWM control block. The
integrated PWM controller features include a fixed
oscillator, Under-Voltage Lockout (UVLO) protection,
Leading-Edge Blanking (LEB), an optimized gate turn-
on/turn-off driver, Thermal Shutdown (TSD) protection,
and temperature-compensated precision-current
sources for loop compensation and fault protection
circuitry. When compared to a discrete MOSFET and
controller or RCC switching converter solution, the
FSDM311A device reduces total component count and
design size and weight, while increasing efficiency,
productivity, and system reliability. This device provides
a basic platform that is well suited for the design of
cost-effective flyback converters.
Related Resources
AN-4134: Design Guidelines for Off-line Forward
Converters Using Fairchild Power Switch (FPS™)
AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS™)
AN-4138: Design Considerations for Battery Charger
Using Green Mode Fairchild Power Switch (FPS™)
AN-4140: Transformer Design Consideration for Off-
line Flyback Converters Using Fairchild Power Switch
(FPS™)
AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback Applications
AN-4147: Design Guidelines for RCD Snubber of
Flyback
AN-4148: Audible Noise Reduction Techniques for
FPS™ Applications
Ordering Information
Product Number
Package Marking Code
FSDM311A
8DIP
DM311A
All packages are lead free per JEDEC: J-STD-020B standard.
FPS™ is a trademark of Fairchild Semiconductor Corporation.
© 2007 Fairchild Semiconductor Corporation
FSDM311A • Rev.1.0.2
BV_DSS
650V
f_OSC
67KHz
R_DS(ON)
14Ω
www.fairchildsemi.com