LYT4225E数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

High Performance, Combined Driver, Controller, Switch\r
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The LYTSwitch-4 family enables off-line LED drivers with high power factor which easily meet international requirements for THD and harmonics. Output current is tightly regulated with better than ±5% CC tolerance1. Efficiency of up to 92% is easily achieved in typical applications.\r
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Supports a Wide Selection of TRIAC Dimmers\r
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The LYTSwitch-4 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. Large dimming ratio and low \"pop-on\" current.\r
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Low Solution Cost and Long Lifetime\r
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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 132 kHz switching frequency permits the use of small, low-cost magnetics.\r
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LED drivers using the LYTSwitch-4 family do not use primary-side aluminum electrolytic bulk capacitors. This means greatly extended driver lifetime, especially in bulb and other high temperature applications.

特性 Features

·Better than ±5% Constant Current (CC) Regulation\r
·Power Factor Correction (PFC) for Low-Line Applications\r
·TRIAC Dimming and Non-Dimming Options\r
·Fast start-up\r
·<250 ms at full brightness\r
·<1s at 10% brightness\r
·High power factor >0.9\r
·Easily meets EN61000-3-2\r
·Less than 10% THD in optimized designs\r
·Up to 92% efficient\r
·132 kHz switching frequency for small magnetics