Fairchild FSDM311A Green Mode Power Switch (FPS) Data Handbook
Summary
This high-efficiency Green Mode Power Switch regulator (FSDM311A) is designed for compact, off-line Switch-Mode Power Supplies (SMPS). It integrates PWM and SenseFET technology, offering robust features like UVLO, OVP protection, and soft-start functionality to reduce component count. This manual serves as a comprehensive guide covering the device's internal operation, precise pin definitions, safety protections, and best practices for designing optimized flyback converters, making it essential for engineers developing consumer electronics and auxiliary power solutions.
Page 1 Text Content
FSD 311A reen M ode Fairchild Pow er Sw itch (FPS
November 2007
FSDM311A Green Mode Fairchild Power Switch (FPS™)
Features Description
Internal Avalanche-Rugged Sense FET The FSDM311A consists of an integrated Pulse Width Modulator (PWM) and Sense FET, and is specifically
Precision Fixed Operating Frequency: 67KHz
designed for high-performance, off-line, Switch-Mode Power Supplies (SMPS) with minimal external
Consumes Under 0.2W at 265VAC & No Load with
components. This device is an integrated high-voltage
Advanced Burst-Mode Operation
power switching regulator that combines a VDMOS
Internal Start-up Circuit Sense FET with a voltage-mode PWM control block. The
integrated PWM controller features include a fixed
Pulse-by-Pulse Current Limiting
oscillator, Under-Voltage Lockout (UVLO) protection,
Over-Voltage Protection (OVP) Leading-Edge Blanking (LEB), an optimized gate turn-
on/turn-off driver, Thermal Shutdown (TSD) protection,
Overload Protection (OLP)
and temperature-compensated precision-current
Internal Thermal Shutdown Function (TSD) sources for loop compensation and fault protection
circuitry. When compared to a discrete MOSFET and
Auto-Restart Mode
controller or RCC switching converter solution, the Under-Voltage Lockout (UVLO) with Hysteresis FSDM311A device reduces total component count and design size and weight, while increasing efficiency,
Built-in Soft-Start
productivity, and system reliability. This device provides Secondary-Side Regulation a basic platform that is well suited for the design of cost-effective flyback converters.
Applications
Related Resources
Charger & Adapter for Mobile Phone, PDA, & MP3
AN-4134: Design Guidelines for Off-line Forward
Auxiliary Power for White Goods, PC, C-TV, &
Converters Using Fairchild Power Switch (FPS™)
Monitors
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 BVDSS f OSC RDS(ON) FSDM311A 8DIP DM311A 650V 67KHz 14Ω
All packages are lead free per JEDEC: J-STD-020B standard. FPS™ is a trademark of Fairchild Semiconductor Corporation.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FSDM311A • Rev.1.0.2
Page Summary Contents For Fairchild FSDM311A Green Mode Power Switch (FPS) Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 12 |
| File Size | 714.86 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the operating frequency of the FSDM311A?
The FSDM311A has a precision fixed operating frequency of 67KHz.
What is the max output power at 85-265V AC?
The maximum practical continuous power is 8W in an open-frame design at 50°C ambient.
What protections does the FSDM311A include?
It includes UVLO, pulse-by-pulse current limiting, OVP, OLP, and thermal shutdown protection.
What package does the FSDM311A use?
It uses an 8-lead DIP package, which is lead free per JEDEC J-STD-020B standard.