Isolated Secondary Side LED Lighting Current Controller


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The RT8456 is an isolated secondary LED current controller designed specifically for lighting fixtures such as E27, GU10, T5 and T8. The IC is suitable for applications that require power line isolation for safety and reliability, high conversion efficiency, as well as high LED current accuracy.

The RT8456 contains 1) a constant current regulating amplifier with 59mV threshold used to program the LED string current with a simple resistor to within 5% LED current accuracy; 2) an over voltage comparator to protect the output when LED string is open or broken; 3) and an opto-coupler driver to control the primary side of the transformer to complete the system loop.

The RT8456 is offered in a small SOT-23-6 package.


  • Isolated LED Lighting Fixtures
  • E27/GU10/T5/T8
Key Spec.
Status NRND
Recommended Alternative  RT8481
Vin (min) (V) 4.75
Vin (max) (V) 48
Topology Flyback
Current Sense Threshold (mV) 59
Features OVP
Package Type SOT-26
  • Secondary Side LED Current Regulation
  • 4.75V to 48V Operation Range
  • High Accuracy 59mV LED Current Threshold Control
  • 0.6mA Operating Current
  • Programmable LED Current
  • Output Over Voltage Protection
  • Small SOT-23-6 Package
  • RoHS Compliant and Halogen Free
Title Last Update ShareDownload
Isolated Secondary Side LED Lighting Current Controller 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15