LYT4324E3

LYTSwitch™-4 is a single-stage accurate primary-side constant current (CC) controller with PFC for high-line applications with TRIAC dimming and non-dimming options. LYTSwitch-4 ICs are highly integrated and employ 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 132KHz switching frequency permits the use of small, low cost magnetics. LED drivers using the LYTSwitch-4 family do not use primary side aluminium electrolytic bulk capacitors. This means greatly extended driver lifetime, especially in bulb and other high temperature applications. LYTSwitch-4 family provides excellent turn-on characteristics for leading-edge and trailing-edge TRIAC dimming applications.

• Minimum output power of 9W at CBP = 47µF and 22W at CBP = 4.7µF
• Better than ±5% CC regulation, TRIAC dimmable to less than 5% output
• Fast start-up, <lt/>250ms at full brightness, <lt/>1s at 10% brightness
• High power factor <gt/>0.9, up to 92% efficient
• Easily meets EN61000-3-2, less than 10% THD in optimized designs
• 132KHz switching frequency for small magnetics
• High performance, combined driver, controller, switch
• Enables LED drivers with high PF which easily meet international requirements for THD/harmonics
• Output current is tightly regulated with better than ±5% CC tolerance
• Supports a wide selection of TRIAC dimmers

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