TRIAC-Dimmable Offline LED Driver with Integrated PFC & RetroBulb™ Technology

The JST301 is a single-stage, current-mode LED driver optimized for high efficiency, high power factor and compatibility with all TRIAC dimmers. The patented integrated PFC architecture enables excellent power factor over a wide range of operating line and load conditions, even with the simplest of inductor-based driver topologies, thereby reducing solution size, cost, and substantially enhancing system reliability.

The JST301 LED driver uses Jade Sky Technologies' patented RetroBulb™ universal dimmer compatibility technology that mimics the impedance characteristics of an incandescent bulb. It results in a linear 0-100% dimming range, with no flicker. With the JST301, SSL OEMs can design a wide range of LED lamps for retrofit and new installation markets without the complexity and cost of dimmer compatibility testing, consumer education and field issues.

With the JST301, customers can now use the most cost and size efficient buck driver topology to achieve optimal performance and the feature set needed by high-volume LED lamps: higher efficiency, lower heat dissipation, better power factor, improved reliability and universal dimmer compatibility with 0-100% dimming range.

The device is available in both a tiny DFN-10 (3x3mm) and a TSSOP-16 (6.4x5mm) package, and in full -40⁰C to +125⁰C junction temperature range.


  • Smooth monotonic 0-100% dimming range with no-flicker
  • Compatible with all TRIAC dimmers: leading-edge, trailing-edge, digital, and with occupancy sensors
  • Near-unity PFC without external PFC circuitry and independent of driver topology
  • Support for Buck, Buck-Boost and Flyback topologies
  • Adjustable Switching Frequency (50Khz-500KHz) for space constrained designs
  • Spread-spectrum Switching for Reduced EMI, typ 6dB reduction
  • Low Quiescent Current, 500uA
  • Under-voltage Lockout, Thermal Shutdown
  • Integrated Driver
  • Patented PFC Architecture, Dimming technology
  • Higher system efficiency, improved system Cost & Reliability

Exceptional Performance over Dimming Range

  • Power Factor = 0.99 at 13W output
  • Power Factor = 0.91 at 1W output
  • Efficiency: 87% from 120Vrms to 39Vdc at full power
  • Efficiency: 85% from 120Vrms to 23Vdc at full power
  • Efficiency: >82% down to 2W output
  • 0-100% Light Output and anything in between
  • No Flicker over Full Dimming Range

Typical Applications

  • Dimmable Retrofit LED Lamps and Luminaires, up to 30W
  • Industrial and Commercial Lighting, T-lamps
  • LED Driver Modules and Bricks
  • Solid-state Signage

Block Diagram


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