女人天堂AV在线

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    Engineers share: 10 years of LED drive power design, constant current IC use experience summary

    The previous LED lamps used constant voltage power supply. At that time, they did not understand the performance of the LED. According to the data given by the manufacturer, each small lamp bead was given 20MA. After our test, the lamp bead was always burned, and the manufacturera€?s data was known. Unreliable, we have reduced current usage. At that time, in 2002, I made some applications such as MR16 small light bulbs and billboards. I started to do constant current drive in 2007, what HV9910, PT4107, PT6901, SN3910, IR, and more tests, but the first success is QX9910, some goods have been sold, but QX9910 has many bad products, after aging The products are also not stable, there are often flashing lights, and there are still some remaining souvenirs. I think that if you want to be a good driver, you should first find a chip.

    At the beginning of 2007, constant current IC was difficult to find, and the price was also expensive. A HV9910 would cost 8 yuan, and an IR S2540 would cost 25 yuan. In fact, it was a half-bridge chip, which was used to swear, and what Japan Some of the chips are also used to swear. In fact, they are ordinary constant voltage ICs. I have been detouring on these boring chips for a long time, which has seriously affected the progress.

    The HV9910 series is also very popular in the second generation of ICs, but for technical reasons, high voltage directly into the IC, easy to bomb. Later, a lot of imitations came out. The best example is SMD802, which has multiple output short-circuit protections. It has been widely used. With the replacement, this IC is now out of date.

    A lot of ICs have not died before they are officially put into production.

    In 2009, the BP2808 was introduced. This non-isolated IC has been used for several years. It is difficult to make a power supply for 1000 pieces. Because the BP2808 is a third-generation IC with stable performance, it can output more than 30W. Power, and long-term use, more efficient, easy 95%.

    This kind of driver chip has a common shortcoming, that is, EMCT EMI is not good. After long-term exploration, we believe that adding two differential mode inductors at the input end of MOS power can solve EMC, and there are several solutions for EMI. Add a magnetic bead to the drain of the MOS tube, but this method increases the loss in exchange for it. My method is to add more than 100P ceramic capacitor to the drain source (SD). This method can Effectively improve efficiency and control EMI.

    Jingfeng is constantly advancing, and now it has introduced BP3105. In the wide voltage range, the constant current accuracy is 1%, which defeats all domestic and foreign solution companies. The first domestic dimming constant current IC: BP3109 is also good. Its design is that the brightness is cut off under certain conditions, avoiding the flashing phenomenon and the cost is very low. I heard that there is a better IC launch in the second half of the year.

    BP2808 is also copied, but Jingfeng Mingyuan has now adjusted the price. The third and second hairs are still stable with the original factory. This imitation IC has a problem when it supplies samples. The test four burned two lights. Board, there are a few that promote me to me, I dare not use it.

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    女人天堂AV在线

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