Telecommunication Systems

Fairchild offers analog, mixed signal, and a full line of power solutions for telecommunication infrastructures and its applications. Fairchild has a complete portfolio for the analog and mixed signal integrated circuits telecom signal conditioning needs. Power solutions include offerings for off-line and isolated power converters to non-isolated power converters. In addition to offering the broadest power discrete semiconductor solutions for telecom infrastructure, Fairchild has off-line and isolated solutions include flyback converters, standard PWM ICs, resonant converters such as LLC and phase-shifted full bridge, SR Controllers. The non-isolated DC-DC solutions cover step-up and step-down converters with and without integrated switches for all the internal chipsets' needs. 

Design Advantages

  • Soft-start functionality integrated
  • Lower the total solution cost with an integrated 700V internal switch
  • Ultra-low standby power minimizes the converter power loss during idle
  • Extensive portfolio for various AC-DC and DC-DC applications
  • Design circuit simplified with high voltage start-up circuit internal
  • Input Under-Voltage Lockout (UVLO) / Output Over-Voltage Protection (OVP)
  • Thermal Shutdown (TSD) Protection / Short-Circuit Detection
  • High-voltage SuperFET® II super-junction MOSFETs provide robust body diode performance for designs requiring high-power density, system efficiency and reliability
  • Pulse skipping for frequency limiting operation under light load condition
  • Save board space and reduce manufacturing cost
  • PowerTrench® MOSFET technology enables high-power density for high efficiency solutions providing the lowest RDS ON available, improved FOM and lower power dissipation
Application NoteDescription
AN-6067Design and Application of Primary-Side Regulation (PSR) PWM Controller
AN-4149Design Guidelines for Quasi-Resonant Converters Using KA5Q-series Fairchild Power Switch (FPS™)
AN-6300FAN6300/A/H Highly Integrated Quasi-Resonant PWM Controller
AN-4150Design Guidelines for Flyback Converters Using FSQ-Series Fairchild Power Switch (FPS™)
AN-6203Applying SG6203 to Control a Synchronous Rectifier of a Flyback Power Supply
AN-9008The Use of QFET® in Flyback Converter
AN-6027Design of Power Factor Correction Circuit Using FAN7530
AN-6075Compact Green-Mode Adapter Using FSQ500L for Low Cost
AN-6026Design of Power Factor Correction Circuit Using FAN7529
AN-6073FAN6751 Highly Integrated Green-Mode PWM Controller
AN-6032FAN4800 Combo Controller Applications
AN-6014Green Current Mode PWM Controller FAN7602
AN-3008RC Snubber Networks for Thyristor Power Control and Transient Suppression
AN-9005Driving and Layout Design for Fast Switching Super-Junction MOSFETs
AN-9065FRFET® in Synchronous Rectification
AN-8021Building Variable Output Voltage Boost PFC Converters with the FAN9612 Interleaved BCM PFC Controller
AN-7012FPF2100/7 Evaluation Board Users Guide
AN-4137Design Guidelines for Offline Flyback Converters using FPS™
AN-6093Design Guideline for Flyback Charger Using FAN104WMX
AN-4162Switch Node Ring Control in TinyBuck® Regulators
AN-6094AN-6094 Design Guideline for Flyback Charger Using FAN302HL/UL
AN-6069Application Review and Comparative Evaluation of Low-Side Gate Driver
AN-FEB_FAN6224User Guide for FEBFAN6224M_CP01 Evaluation Board
AN-6224Applying FAN6224 for Flyback and Forward Freewheeling Rectification
AN-6747Applying FAN6747 to Control a Flyback Power Supply with Peak Current Output
AN-6754ADesign Guideline to Replace SG6742 with FAN6754A
AN-6204FAN6204 - Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification
AN-6756Applying FAN6756 to Control a Flyback Power Supply with Ultra-Low Standby Power
AN-42047Power Factor Correction (PFC) Basics
AN-9068Gate Resistor Design Guidelines for SupreMOS®
AN-9067Analysis of MOSFET Failure Modes in LLC Resonant Converter
AN-5232New Generation Super-Junction MOSFETs, SuperFET® II and SuperFET® II Easy Drive MOSFETs for High Efficiency and Lower Switching Noise
AN-6099New PowerTrench® MOSFET with Shielded Gate Technology Increases System Efficiency and Power Density in Synchronous Rectification Applications
AN-9757Determination of Maximum Current Rating for Low RDSON DPAK and D2PAK MOSFETs
AN-7536FCS Fast Body Diode MOSFET for Phase-Shifted ZVS PWM Full Bridge DC/DC Converter
AN-4154MOSFETs for 60 W High-Power PoE Applications
AN-FEBFDMQ8203-25WUser Guide for FEBFDMQ8203_25 W GreenBridge™ Evaluation Kit for Power Over Ethernet 25 W Flyback DC-DC
AN-FEBFDMQ86530LUser Guide for FEBFDMQ86530L Evaluation Board
AN-4158Symmetric Dual N-Channel Shielded Gate PowerTrench® MOSFETs for Half-Bridge DC-DC Converter in Telecommunication Brick Module Application
AN-5059LVDS Technology Solves Typical EMI Problems Associated with Cell Phone Cameras and Displays
AN-5058µSerDes™ Family Frequently Asked Questions (FAQ)
AN-9760PCB Design Guidance for SPM®
AN-FEBFOD8316User Guide for FEBFOD8316 Evaluation Board
AN-8037FSA642 - Evaluation Board User Guide
AN-FEBFSB127H_T001User Guide for FEBFSB127H_T001 Evaluation Board
AN-8024Applying Fairchild Power Switch (FPS™) FSBH-series to Standby Auxiliary Power Supply
AN-4148Audible Noise Reduction Techniques for FPS™ Applications
AN-4141Troubleshooting and Design Tips for Fairchild Power Switch (FPS™) Flyback Applications
AN-9719Applying Fairchild Power Switch (FPS™) FSL1x7 to Low-Power Supplies
AN-FEBFSL306LRNUser Guide for FEBFSL306LRN_CS01U02A Evaluation Board
AN-6861Applying FAN6861 to Control a Flyback Power Supply with Surge Current Output
AN-88CMOS Linear Applications
AN-319Comparison of MM74HC to 74LS, 74S and 74ALS Logic
AN-339Fairchilds Process Enhancements Eliminate the CMOS SCR Latch-Up Problem in 74HC Logic
AN-7516Safe Operating Area Testing Without A Heat Sink
AN-5841Applying SG5841 to Control a Flyback Power Supply
AN-6077SG6742 - Highly Integrated Green-Mode PWM Controller
AN-6858Applying SG6858 to Control a Flyback Power Supply
AN-9074C Family Characteristics
AN-6932Applying SG6932 to Control a PFC and Forward/PWM Power Supply
AN-77CMOS, The Ideal Logic Family
AN-377DC Noise Immunity of CMOS Logic Gates
AN-6753Highly Integrated Green-Mode PWM Controller
AN-6902Applying SG6902 to Control a CCM PFC and Flyback/PWM Power Supply
AN-5844Green Mode Fairchild Buck Switch FSL306LR
AN-6741Flyback Power Supply Control with the SG6741
AN-6754Design Guideline to Replace SG6742 with FAN6754
AN-4147Design Guidelines for RCD Snubber of Flyback Converters
AN-7501Switching Waveforms Of The L2FET: A 5 Volt Gate-Drive Power MOSFET
ApplicationDocument NumberFeatured
Power (W)
Input Voltage
Range (VAC)
Cell Phone ChargerPDFRD-336
3.9 W90-265VACPrimary-Side Regulated Flyback Converter
Cell Phone ChargerPDFRD-315
5 W90-265VACPrimary-Side Regulated Flyback Converter
10 W90-264VACPrimary-Side Regulated Flyback
Smart Phone ChargerPDFRD-FAN104WMD-T06U005A
5 W90-264VACPrimary-Side Regulated Flyback
300 W85-265VACCCM Boost PFC + Two SwitchForward + Flyback
Notebook AdapterPDFRD-311
65 W90-264VACFlyback Converter
65 W90-264VACFlyback Converter
Netbook AdapterPDFRD-337
40 W90-265VACFlyback Converter
SMPS NB AdapterPDFRD-351
90 W90~264 VACDual Switch Flyback
120 W90~264V ACDual Switch Flyback
Power Supply LCD MonitorPDFRD-203
49.2 W85-265VACFlyback Converter
PC Standby PowerPDFRD-304
20 W85-265VACFlyback Converter
Cell Phone ChargerPDFRD-310
3.5 W90-265VACPrimary-Side Regulated Flyback Converter
Power Supply LCD MonitorPDFRD-331
29.6 W85-265VACFlyback Converter
18.1 W85-265VACFlyback Converter
Power Supply LCD MonitorPDFRD-334
40 W85-265VACFlyback Converter
Power Supply LCD MonitorPDFRD-204
60 W85-265VACFlyback Converter
Cell Phone ChargerPDFRD-350
5 W90-264VACPrimary-Side Regulated Flyback