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Increasing the voltage increases the current, yes, but the region where that happens without the current getting too much is very small. With an LED it's the amount of current flowing through it that determines how bright it is. As the voltage increases so does how well the diode conducts, but it does that in a non-linear fashion. It has a forward voltage which is the voltage at which the diode starts to conduct. These don't follow Ohm's Law in the classic sense (however Ohm's Law is still used in conjunction with them).Īn LED is (obviously) a form of diode. LEDs belong to a class of device known as non-linear devices. LEDs are a very very different beast compared to incandescent light bulbs. But would they work in the same fashion? Would changes in voltage be accompanied with corresponding changes in brightness? I think you can even buy LEDs with built-in resistors.
LED DRIVER WITH BRIGHTNESS CONTROL SERIES
I was wondering - can LEDs be used in the same way? I know that for a LED to be usable in a similar way as a classical lightbulb, you need to put it in series with a resistor, otherwise it draws too much current and burns out. But LEDs are different and follow different rules, which I don't understand myself very well. This day and age however incandescent bulbs are on the way out, and LEDs are replacing them for a good reason (like not burning out every few months or so). When you put them in parallel, they glowed normally, but drained the battery twice as fast. When you put two lightbulbs in series, they glowed 1/4 as bright. When you doubled the voltage by putting two batteries in series, it glowed 4x as bright, but heated up more and was more prone to burning out. The FAN5341 is priced (each 1,000pcs) at $0.72 with a delivery of 12 weeks ARO.When I was young and learning about electricity, a fabulous tool for understanding voltage/current/resistance was an incandescent lightbulb (in my case it was a small 3V bulb).
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The FAN5341 is assembled in a compact, low profile 2 x 2mm UMLP package.
LED DRIVER WITH BRIGHTNESS CONTROL PORTABLE
This LED driver also addresses space and power considerations in portable designs since it offers up to 83% efficiency, minimizing power consumption. And since this lighting solution drives three to five LEDs in a series, the same current flows through each LED to ensure equal brightness. With the FAN5341’s simple single-wire interface, a designer can easily control the brightness levels of the LEDs by transmitting digital pulses from the microcontroller to the FAN5341. This boost LED driver operates at 1.2MHz switching frequency, and integrates a Schottky diode to minimize the size of the external passive components and overall board space. By driving the LEDs in series this device ensures that all the LEDs used in applications such as mobile handsets, digital still cameras, GPS devices, MP3 players and other applications using small LCD displays have equal brightness.
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Fairchild Semiconductor introduced the FAN5341 an LED driver solution that is said to improve brightness and resolution in portable designs, while offering 32 linear dimming steps and driving up to five white LEDs in series.