LYTSwitch-4 LED Driver ICs

By Power Integrations 51

LYTSwitch-4 LED Driver ICs

Power Integrations' LYTSwitch family enables offline LED drivers with high power factor, which easily meet international requirements for THD and harmonics. Tightly-regulated output current, with better than ±5% CC tolerance, enables efficiency of up to 92% in typical applications.

The LYTSwitch family provides excellent turn-on characteristics for leading-edge and trailing-edge TRIAC dimming applications. This results in drivers with a wide dimming range and fast start-up, even when turning-on from a low conduction angle. Additionally, the device offers large dimming ratio and low "pop-on" current.

LYTSwitch ICs are highly integrated, employing a primary-side control technique that eliminates the optoisolator and reduces component count. This allows the use of low-cost, single-sided printed circuit boards. Combining PFC and CC functions into a single-stage also helps reduce cost and increase efficiency. The 132 kHz switching frequency permits the use of small, low-cost magnetics.

LED drivers using the LYTSwitch family do not use primary-side aluminum electrolytic bulk capacitors. This means greatly extended driver lifetime, especially in bulb and other high temperature applications.

Features
  • Better than ±5% Constant Current (CC) regulation
  • Power Factor Correction (PFC) for low-line applications
  • Easily meets EN61000-3-2
    • Less than 10% THD in optimized designs
  • 132 kHz switching frequency for small magnetics
  • TRIAC dimming and non-dimming options
  • Fast start-up
    • <250 ms at full brightness
    • <1s at 10% brightness
  • High power factor >0.9
  • Up to 92% efficient

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