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ZMDI公司的ZLED7330 LED驅動器的電源效率達到98%,主要為高亮和大電流LED而設計. ZLED7330具有三種模式來決定輸出電平,輸出電流高達1.2A,內部集成了40V功率開關,DC輸入電壓從8.5V到40V,輸出電流精度5%,LED開路保護和熱關斷保護.本文介紹了ZLED7330主要特性和優勢,以及幾種基本應用電路. The ZLED7330 continuous-mode inductive step-down converter family is one of our ZLED LED control ICs. It is designed for applications requiring high brightness and high current. The ZLED7330 can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED forward voltage (Vin = 8.5 to 40VDC). It provides an adjustable output current (1.0A maximum), which is set via an external resistor and controlled by the ZLED7X30’s integrated high-side output current-sensing circuit and high speed internal 40V power switch. Its low conducting impedance ensures high system efficiency. The ZLED7330 provides a switch dimming function. It detects external switch action to adjust output current, allowing dimming functionality to be achieved without changing the original lighting system circuitry. The switch dimming is implemented in either two-level-mode or three-level mode. The output current of every level and the total number of levels are customer selected by setting the corresponding input conditions of DIM1 and DIM2 pin. The ZLED7330 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7330 can also minimize bill-of-material costs because very few external components are required for most applications. Only a resistor, a diode, an inductor, and a capacitor are needed for a typical basic application. For easy evaluation of the ZSC7330, ZMDI offers the ZSC7330 Demo Kit, which includes a cascadable test board including one 5W white High Brightness LED, 5 ZLED7330 samples in SOP-8 package and documentation. Order using part number ZLED7330KIT-D1. Additional unpopulated cascadable test boards are also available. ZLED7330主要特性: Switch dimming with multiple levels Three modes for output level settings Up to 1.2A output current Internal 40V power switch Wide DC input voltage range 8.5 to 40 VDC Output current accuracy: 5% (typical) LED open-circuit protection Thermal shutdown protection ZLED7330優勢: High efficiency: up to 98% Very few external components needed for operation Adds switch dimming function to existing installation ZLED7330應用: MR16/MR11 LED spot lights LED street lights parabolic aluminized reflector (PAR) LED lights and other general purpose industrial and consumer LED applications 
圖1.開關調光的ZLED7330應用電路
圖2.輸出電流由RS決定的 ZLED7330基本應用電路
圖3.采用鹵鎢燈電子變壓器的ZLED7330應用電路 詳情請見: http://www.zmdi.com/products/led-drivers/zled7330/ |
