How Do LED light bulbs works on Mobile Phone Circuit

Posted on Feb 4, 2014

An LED - light emitting diode is used to illuminate keypads keys and LCD screen displays on all mobile phones handsets. It is being controlled by a voltage or current draws on its terminal leds. On schematic diagram we notice that the LEDs is driven by an LED driver chip`s, and an Switching Control circuit that also being packed in a chip. The LED

How Do LED light bulbs works on Mobile Phone Circuit
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driver is being used to stabilized the voltage and current and do take control on engaging ON and OFF status of an LEDs to light up or not. The Switching control circuit feeds and release a Pulse Width Modulation Signal (PWM) to switch and light up the LEDs light bulbs. A pulse width modulation signal is a type of digital frequency signal range up to 1khz to enable and implement to take control of LED brightness. Once that certain signal is being received by the LED driver, the LED driver now will engage and release the voltage or current that being feeds up from the mobile phones battery supply voltage; LED drivers is a high frequency, synchronous boost converter with constant current output to drive up to 5 white LEDs. This device circuit is designed for maximum safety, it integrates overvoltage and short circuit protection when the output is being shorted to the ground. Meaning this chips circuitry will not easily breakdown for it is designed to protect when short circuit happens. In mobile phones application methods; the switching control circuit that release pulse switching signal is also being synchronized programmed by the the application processor (CPU) to engaged a full control on how and which proper situation that the LED will be switch to light up or not. The above image is an example of the LED circuit, how those particular stages and components being mounted on a phones circuits. Note that the LED driver and...

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