ZMDI ZLED7330电源效率98%低成本LED驱动方案
发布时间：2011-7-21 11:04
发布者：Liming
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ZMDI公司的ZLED7330 LED驱动器的电源效率达到98%,主要为高亮和大电流LED而设计. ZLED7330具有三种模式来决定输出电平,输出电流高达1.2A,内部集成了40V功率开关,DC输入电压从8.5V到40V,输出电流精度5%,LED开路保护和热关断保护.本文介绍了ZLED7330主要特性和优势,以及几种基本应用电路. 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优势: High efficiency: up to 98% Very few external components needed for operation Adds switch dimming function to existing installation ZLED7330应用: MR16/MR11 LED spot lights LED street lights parabolic aluminized reflector (PAR) LED lights and other general purpose industrial and consumer LED applications 
图1.开关调光的ZLED7330应用电路 
图2.输出电流由RS决定的 ZLED7330基本应用电路 
图3.采用卤钨灯电子变压器的ZLED7330应用电路 详情请见: http://www.zmdi.com/products/led-drivers/zled7330/ |
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