Market of driver of Bai Guang LED is hot, chip supplier people competition is intense, they develop amid of advanced to in an attempt to of charge pump product to be occupied in succession position. Pump of this kind of charge can be offerred taller be in a poor light power, contented bigger and more complex portable / the color screen of wireless equipment indicates demand. In addition, manufacturer people still advocate in be in a poor light be used in face plate can make LED is had much better the chip that brightness matchs. Do not cross OEM most how does care issue still increase switch electric capacity (charge pump) the efficiency of power source, and those who use step up converter to achieve balanced performance is the biggest change. Charge pump uses the LED of drive paralell connection normally, and step up converter often is used at drive series connection and string / shunt-wound LED. The space that charge pump parts of an apparatus takes up wants small much, it is the first selection of large OEM manufacturer it seems that. They are favorred, besides can use at different application beyond, still having an indirect reason is the power source that people thinks to be based on inductance the likelihood brings the EMI that cannot overcome problem. Actually, the develop that the pump of a batch of charge that rolls out recently uses attacks appear quite common, the difference between each chip, advocate if be in specific application,had delicate change to make the user gains an advantage. TonyArmstrong of selling manager of product of ministry of career of power source of company of approach spy science and technology expresses: "The market asks present parts of an apparatus must have advocate screen and second screen monitor, and monitor of a RGB provides back photoelectricity source. " the characteristic that he notices to products plan asks to expand ceaselessly. Actually, the LTC3206 that this company just releases is pump of such a kind of charge. He emphasizes saying, voltaic precision (the difference between LED average electric current and expectation electric current) and matching a question is very complex. "Although the client feels glad to the voltaic precision of 10% , but they will be right match accuracy (be in given below average electric current, the biggest difference between any two LED current source) be more than 5% and put forward to complain. " divide this beyond, he earlies childhood, a problem that often encounters negligence is overall efficiency, and batteries is direct power supply time and be in through charge pump when voltage begins to drop 1. 5 or the per cent of time of the power supply below 2 times mode CNC Milling
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