Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductors system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore ( ), the underscore ( ) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore ( ). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild questions onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN501A Offline DCM / CCM Flyback PWM Controller for Charger Applications April 2014 FAN501A Offline DCM / CCM Flyback PWM Controller for Charger Applications Description Features The advanced PWM controller, FAN501A, simplifies WSaver Technology Provides Ultra-Low isolated power supply design that requires CC Standby Power Consumption for Energy Stars regulation of the output. The output current is 5-Star Level (<30 mW) precisely estimated with only the information in the Constant-Current (CC) Control without primary side of the transformer and controlled with an Secondary-Side Feedback Circuitry for internal compensation circuit, removing the output Discontinuous Conduction Mode (DCM) and current-sensing loss and eliminating external CC Continuous Conduction Mode (CCM) control circuitry. With an extremely low operating current (250 A), Burst Mode maximizes light-load Dual-Frequency Function Changes Switching efficiency, allowing conformance to worldwide Frequency (140 kHz / 85 kHz) According to Input Standby Mode efficiency guidelines. Voltage to Maximize Transformer Utilization and Improve Efficiency Compared with a conventional approach using external control circuit in the secondary side for CC High Power Density and High Conversion regulation, the FAN501A can reduce total cost, Efficiency in CCM Compact Charger Applications component count, size, and weight while increasing Frequency Hopping to Reduce EMI Noise efficiency, productivity, and system reliability. High-Voltage Startup V o Precise Maximum Output Power Limit by CC Regulation through External Resistor Adjustment Peak-Current-Mode Control with Slope Maximum Compensation to Avoid Sub-Harmonic Oscillation Typical Minimum Programmable Over-Temperature Protection with Latch Mode through External NTC Resistor Two-Level UVLO Reduces Input Power in Output Io Short Situation Figure 1. Typical Output V-I Characteristic V Over-Voltage Protection with Latch Mode S V Over-Voltage Protection with Auto Restart DD Available in MLP 4 X 3 Package Applications Battery Chargers for Smart Phones, Feature Phones, and Tablet PCs AC-DC Adapters for Portable Devices or Battery Chargers that Require CV / CC Control Ordering Information Operating Packing Part Number Package Temperature Range Method 10-Lead, MLP, QUAD, JEDEC MO-220 4 mm x 3 mm, FAN501AMPX -40 C to +125 C Tape & Reel 0.8 mm Pitch, Single DAP 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN501A Rev. 1.0.0