ISL1902FAZ

Voltage - Output:	--
Base Part Number:	ISL1902
Supplier Device Package:	24-QSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TA)
Applications:	Lighting
Dimming:	Analog, PWM
Frequency:	--
Current - Output / Channel:	--
Series:	--
Voltage - Supply (Max):	20V
Voltage - Supply (Min):	9V
Number of Outputs:	1
Internal Switch(s):	No
Topology:	Flyback, Forward, SEPIC, Step-Up (Boost)
Type:	AC DC Offline Switcher
Part Status:	Obsolete
Packaging:	Tube

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Introduction

Power Management Integrated Circuit (PMIC) LED drivers are the devices responsible for providing a stable power source to LED components with minimal power losses. LED drivers can have either constant current or constant voltage applications. ISL1902FAZ is one of the recently developed PMICs, focused primarily on providing a constant current power source to LED components. This PMIC is popular among many manufacturers because of its easy to use and cost effective design.

Overview of ISL1902FAZ

The ISL1902FAZ is ideal for simple and low cost designs because of its combination of high efficiency, excellent thermal design and reliability. It is a constant current regulation PMIC that provides the current regulation for driving up to two LEDs in series configuration.The ISL1902FAZ has a wide input voltage range of 2.5V to 38V, which makes it very suitable for a range of applications. It is also efficient with a minimum efficiency of up to 85.5% in 12V to 0V mode and up to 90.5% in open circuit mode.The ISL1902FAZ also has an in-built thermal protection system that protects the PMIC from excessive temperatures and prevents any damages to other components. It also features various operating modes like boost, buck-boost, and push-pull.

Application Fields

The ISL1902FAZ has a wide range of applications, ranging from display backlighting, TV backlight to automotive applications. It is used for driving up to two LEDs in series connection for lighting or backlighting applications as its constant current technology prevents any power losses due to voltage losses. It is also used in automotive applications, such as LED headlight and tail light applications, as it provides stable and safe LED driving power.

Working Principle

The ISL1902FAZ works by using a linear regulation circuit to reduce the voltage across the LED by constantly monitoring the current flowing through each LED. The ISL1902FAZ is able to regulate the current between 5mA to 260mA.The input voltage is set accordingly to the required voltage and is supplied to the regulator circuit. The regulator circuit then monitors the current flowing through the LED and adjusts the voltage accordingly to maintain the set current. The ISL1902FAZ also features integrated protection features such as overvoltage protection, over temperature protection and short circuit protection. The overvoltage protection feature prevents any damages to the LED due to overvoltage while the over temperature protection feature prevents overheating of the PMIC.

Conclusion

The ISL1902FAZ is an ideal PMIC for LED driver applications that require efficient, reliable and cost effective power management designs. It is a versatile PMIC with a wide range of applications, and its working principle ensures that the LED is not damaged due to an overload or overvoltage.

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