National Semiconductor added the "WEBENCH LED Architect" tool for LED driver circuits to the company's online design support tool "WEBENCH". This is a free tool to support LED lighting design . It can be used to design LED lighting with a luminous flux of up to 100,000 lm (lumen).
Simply input the input voltage range, ambient temperature, required luminous flux and illuminating color to query the pre-recorded data and analyze it to optimize the LED, LED driver IC and heat sink. In addition, the parameter adjustment function "Optimizer Dial" is provided, which can change the weighting coefficient of the package area, component (BOM) cost and conversion efficiency of the drive circuit to perform query analysis again. The analysis results obtained can be output in the form of reports including circuit diagrams, BOM (BOM) lists, and simulation results of performance.
Online design support tool for LED driver circuits for lighting applications
The data entered in advance are as follows. The LEDs are 350 products of 12 companies including Cree, Osram Opto Semiconductor and Sharp in Germany. The heat sink is 30 products and the LED driver IC is 35 products. All LED driver ICs are products of National Semiconductor. Specifically, the IC "LM3464" capable of driving LEDs with high efficiency by using LDO adjustment circuit, the "LM3409HV" for vehicle-mounted LED driver IC according to the quality standard "AEC-Q100", and the thermal control function are provided by the dynamic headroom control function. LED driver IC "LM3424" and so on.
Die casting is the pressure of metal molds on a die casting machine and is the most productive casting process. Die-casting machines are divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. The hot chamber die casting machine has a high degree of automation, less material loss, and higher production efficiency than the cold chamber die casting machine. The aluminum alloy die castings that are widely used today can only be produced on cold chamber die casting machines due to their high melting point. The main feature of die casting is that the molten metal fills the cavity under high pressure and high speed, and is formed and solidified under high pressure. The air in the cavity is wrapped inside the casting to form subcutaneous pores, so aluminum alloy die castings should not be heat treated, and zinc alloy die castings should not be sprayed on the surface (but can be painted). Otherwise, the internal pores of the casting will expand due to thermal expansion and cause the casting to deform or bubble when the above-mentioned treatment is performed. In addition, the mechanical cutting allowance of die castings should also be smaller, generally around 0.5mm, which can not only reduce the weight of castings, reduce the amount of cutting to reduce costs, but also avoid penetrating the surface dense layer and exposing subcutaneous pores, causing The workpiece is scrapped.
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