FSEZ1317 − PSR Flyback PWM Controller with MOSFET Integrated for LED Lighting


This third-generation Primary Side Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. The proprietary topology, TRUECURRENT®, of FSEZ1317 enables precise CC regulation and simplified circuit design for battery-charger applications. A low-cost, smaller, and lighter charger results, as compared to a conventional design or a linear transformer.

To minimize standby power consumption, the proprietary green mode provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green mode assists the power supply in meeting power conservation requirements.

By using the FSEZ1317, a charger can be implemented with few external components and minimized cost.

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Product Status/Pricing/Packaging

Product Product & Eco Status *Pricing Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
0 FSEZ1317MY Not recommended for new design
Green as of Nov 2008
1.372 x 3.912 x 4.902mm

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code) &K
Line 2:EZ1317
Line 3:MYN
ESD (HBM) :  5000  V
RƟJA :  150  °C/W
Moisture Sensitivity Level (MSL) :  1  
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0 FSEZ1317NY Not recommended for new design
Green as of Apr 2010
$0.74  Details
3.4 x 6.4 x 9.2mm

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code) &K
Line 2:EZ1317
Line 3:NYN
ESD (HBM) :  5000  V
RƟJA :  150  °C/W


  • Low Standby Power Under 30mW
  • High-Voltage Startup
  • Fewest External Component Counts
  • Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry
  • Green-Mode: Linearly Decreasing PWM Frequency
  • Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem
  • Cable Compensation in CV Mode
  • Peak-Current-Mode Control in CV Mode
  • Cycle-by-Cycle Current Limiting
  • VDD Over-Voltage Protection with Auto Restart
  • VDD Under-Voltage Lockout (UVLO)
  • Gate Output Maximum Voltage Clamped at 15V
  • Fixed Over-Temperature Protection with Auto Restart
  • Available in the 7-Lead SOP and DIP Packages


  • Mobile Handsets
  • Lighting

Application Notes



LED Lighting Total Solutions

Introduction to Fairchild's Power Supply WebDesigner, an Online Design and Simulation Tool

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Reference Designs

Application Document Number Featured Products Output
Cell Phone Charger RD-310 FSEZ1317, FSEZ1317A 3.5W 90-265VAC Primary-Side Regulated Flyback Converter

Design Tools

Design Tool Design Tool
Primary-side Regulation CV/CC - Flyback Online system design and simulation tool for primary-side regulated (PSR) IC flyback controller IC and controller IC with integrated MOSFETs.
Power Supply WebDesigner - Flyback Design & Simulation - In Minutes at No Expense If you want to complete an off-line flyback converter design with minimal engineering time and expense, you've found the answer. Simply enter your input and output requirements, click on "Auto-Complete", and Power Supply WebDesigner (PSW) does the rest.Or if you prefer to fine tune parameters to optimize performance as you perform detailed analyses and simulations, all while eliminating the need for a hardware prototype, Power Supply WebDesigner does it all.PSW automatically generates a BOM and lets you confidentially save your design for future reference by you or others on your team. Start saving days-to-weeks of engineering time with PSW, whether you're a power supply expert or not.


Introducing Power Supply WebDesigner Design Tool
2011-10-26 00:05:17 2055, 5076558B Download
Introduction to Fairchild's Power Supply WebDesigner, a design tool for Flyback Converter solutions. This online design and simulation tool takes your specifications and provides a complete Primary-Side Regulated (PSR) Flyback converter or Secondary-Side Regulated (SSR) Flyback Converter design whether you are a power supply expert or not.

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