ISL1904FAZ

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ISL1904FAZ Application Field and Working Principle

PMIC (Power Management Integrated Circuit) is a dedicated integrated circuit (IC) type which is responsible for controlling the various power electronics within a device. LED drivers is one specific application for power management ICs, and the ISL1904FAZ is one of the most popular ICs in this field.

Introduction to ISL1904FAZ

The ISL1904FAZ is a high-accuracy and monolithic linear LED driver from Intersil Corp, which offers users an improved regulating of the output voltage with less component complexity. It allows a single IC to deliver up to 5A output current in a very small 5mm x 5mm package, making it ideally suitable for a variety of modern lighting applications.

Features of ISL1904FAZ

This device is designed to control constant current LED drivers over a wide input supply range, giving it a huge advantage over conventional linear LED drivers. Features like high voltage operating experience, low part count and improved light quality output make the ISL1904FAZ artificial lighting design easier and more efficient. Itemized features of this IC are as followed:

• High voltage operation up to 400V
• High accuracy, plus/minus 10 percent current regulation
• Accuracy over wide range of temperature and voltage variations
• Achieves >95 percent efficiency
• Industry-standard tiny 5mm x 5mm QFN16 package
• Wide supply range from 3V to 400V
• Low current consumption 50uA typical
• Thermal protection

Application of ISL1904FAZ

The ISL1904FAZ is an ideal choice for LED lighting applications as it offers high power density and improved light quality while producing much less heat than traditional LEDs. It can be used in a wide range of applications including general lighting, automobile lighting, infra-red lighting and lamp replacement. The device has proven its high reliability across a variety of operating conditions, including shock and vibration, temperature extremes, high humidity and other environmental extremes.

Design Consideration of ISL1904FAZ

The ISL1904FAZ is a constant current LED driver, meaning the load current is regulated to a predetermined level. This value is set by the external current sense resistor and it should not be greater than the rating of the IC. It is also important to select a sense resistor that will provide an accurate current regulation under dynamic conditions. The ISL1904FAZ also requires an input voltage sufficient to trip the current limit and ensure proper operation of the IC.

Working Principle of ISL1904FAZ

The basic idea behind the ISL1904FAZ\'s working principle is to keep the output current at a given level through a process of constant loop regulation. Its basic topology is comprised of an operational amplifier, current sense resistor, and the P-FETs to regulate the output current. The device operates by comparing the voltage across the external current sense resistor to the internal reference voltage and then adjusting the P-FETs to maintain the desired current limit.

Conclusion

In conclusion, the ISL1904FAZ is an excellent choice for LED lighting applications, as it offers high power density and improved light quality with less heat generation and great reliability in extreme conditions. Its low part count and wide input supply range make the IC ideal for a variety of applications including automotive, general, and infrared lighting.

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