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USL3638 - HIGH PRECISION PSR CONSTANT CURRENT LED DRIVER

General Description

discontinuous conduction mode for inductor current.

Key Features

  • Built-in 650V Power MOSFET.
  • No Auxiliary winding for sensing and supplying.
  • Constant current control without secondary sense and feedback circuit.
  • Ultra low operating current to improve efficiency.
  • Universal input voltage.
  • ±5% LED current accuracy.
  • Choice for maximum duty cycle and OVP voltage.
  • CS resistor short circuit protection.
  • LED short and open circuit protection.
  • Over temperature protection.
  • VCC under-voltage protection.
  • ORD.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UNISONIC TECHNOLOGIES CO., LTD USL3638 Advance HIGH PRECISION PSR CONSTANT CURRENT LED DRIVER CMOS IC  DESCRIPTION DIP-8 The UTC USL3638 is a high performance, high precision primary-side feedback and regulation and constant current controller for LED lighting, The UTC USL3638 operates in discontinuous conduction mode for inductor current. It is suitable for flyback convertor under the 90V~264V universal input. The system output power for UTC USL3638 (SOP8) and UTC SOP-8 USL3638 (DIP8) is recommended to be less than 8W and 11W. The UTC USL3638 integrates 650V power MOSFET. Since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated.