ON Semiconductor


12W LED Lighting Power for Bulb Application

Topology: Flyback
Input Voltage (min.): 90.00 V
Input Voltage (max.): 264.00 V
Switching Frequency (min.): 0.05 kHz
Switching Frequency (max.): 0.06 kHz
Output 1: 28.00 V / 0.500 A

Original publication on 2014-02-18, revision 1.0


This document is an engineering report describing a 12W LED Lighting Power for Bulb application, which using Fairchild’s latest LED device FL7733MY, it could meet customer’s high PF, low THD request, and the Circuitry is very simple.The highly integrated FL7733MY provides several features to enhance the performance. The single stage topology with PSR could implement best performance and cost using fewest external components, In order to implement high PF and low THD, Constant on time is utilized with an external capacitor, connected to COMI.Precise constant-current control regulates accurate output current versus changes in input voltage and output voltage. The operational frequency is proportionally changed by the output voltage to guarantee DCM operation.FL7733MY have several protections to enhance the device’s performance. Such as Open LED Protection, Short LED Protection; Sense Resistor Short Protection ,Cycle by cycle current limit and Over-temperature Protection etc.FL7733MY also has frequency hopping function in the oscillator for better EMI performance.FL7733MY controller is available in 8-pin SOP.


  Order Code SPEC Product series VRMS
VDE-Zulassung Samples
750342265 PDF Flyback Transformer WE-UNIT
820552711 PDF WE-VD Disk Varistor 275 350 430 400 16.5 0.1 Yes