Semtronics Micro Systems

External MOSFET

SM6380 is a primary-side Fly-back control IC with single-stage active power factor correction function for LED lighting systems. The IC achieves high power factor and low THD operation by quasi-resonant switch-mode in zero-current state conduction. This effectively reduces the switching losses of power MOSFET to improve system efficiency, but also improves the EMI characteristics of the system. The line and load regulation of LED current is about ±3% because of this particular control method.

SM6380 can achieve high precision LED constant current output, does not need an opto coupler, secondary feedback circuitry. This save the cost and size of the system, simplifying the design of LED lighting systems. SM6380 also provides gate driving voltage clamping, VCC over-voltage protection and system output open/short circuit protection to increase IC performance.

Key Features

  • Primary-side feedback control
  • Quasi resonant switching mode
  • Low input current THD
  • >3% Output Current accuracy
  • Ultra low start up current
  • Excellent line and load regulation
  • Gate driving voltage clamping
  • Low cost BOM
  • SOT 23 6L Package


  • LED lighting
  • Down light
  • Tubelight
  • Street Light

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