AL1678DMTR-G1 Integrated Circuits (ICs)

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AL1678DMTR-G1 Application Field and Working Principle

The AL1678DMTR-G1 from Alpha and Omega Semiconductor is an advanced, multi-channel, Peak-Capless, PWM-controlled LED Driver integrated circuit (IC). It is designed to drive high brightness LEDs in portable and mobile applications, with a primary focus on direct current (DC) phones, notebook computers, handheld communication devices, and automotive lighting applications. This particular product is classified as a PMIC or Power Management IC, specifically as a LED Driver.

Key Features

The AL1678DMTR-G1 is a highly efficient LED driver that comes with several key features. It has a wide 2.5V to 5.5V adjustable input voltage range and is capable of driving up to 9 LEDs at once. It has a wide output voltage range from 0.3V to 14V, making it well suited for applications requiring wide input and output voltage ranges. It also features an adjustable frequency PWM dimming, with adjustable PWM dimming duty cycle going up to 100%.

The AL1678DMTR-G1 also provides a range of LED protection features that ensure the device can be reliably operated in the field. It offers overvoltage protection (OVP) for single LED applications, low voltage supply protection (LVDT), thermal overload protection (TEMT), undervoltage lockout (UVLO), open/short LED detection, and overcurrent protection (OC). It also has a low quiescent current mode which ensures efficient power consumption. Finally, the device is RoHS (Restriction of Hazardous Substances) and Halogen free to enable efficient environmental stewardship.

Application Fields

The AL1678DMTR-G1 is well suited to a number of applications where energy efficiency, performance and safety are paramount. These include portable and mobile devices such as smartphones, tablets, e-readers and laptops, as well as automotive and professional lighting applications.

The AL1678DMTR-G1 is also a great choice for small form factor lighting applications due to its small size, small power consumption and low voltage requirements. It can also be used in other low voltage applications including wireless sensor networks and medical device designs.

Working Principle

The AL1678DMTR-G1 is an integrated circuit specifically designed for driving high brightness LEDs. It uses pulse width modulation (PWM) technology to control the amount of light output, and to regulate the current supplied to the LEDs. This allows it to achieve energy efficiencies of up to 94%.

The device utilizes a boost power stage to step up the low level input voltage to the higher level required to drive the LEDs. The output voltage is adjustable from 0.3V to 14V, allowing it to be tailored to the specific LED requirements of a given application. The PWM dimming frequency can be adjusted from 200Hz to 20KHz, allowing users to tailor the light output to their needs.

The AL1678DMTR-G1 also features multiple protection features to ensure system safety, reliability and longevity. It has over voltage protection (OVP) for single LED applications, low voltage supply protection (LVDT), thermal overload protection (TEMT), undervoltage lockout (UVLO) and over current protection (OC).

Conclusion

The AL1678DMTR-G1 LED driver from Alpha and Omega Semiconductor is an advanced, multi-channel, Peak-Capless, PWM-controlled LED driver IC designed for portable and mobile applications. It has a wide input and output voltage range and is capable of driving up to 9 LEDs at once. It offers various protections such as OVP, LVDT, TEMT, UVLO and OC to ensure system safety, reliability and longevity.

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