ISL1902FAZ-T

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Part Status:	Obsolete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:	Tape & Reel (TR)

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Overview of PMIC - LED Drivers

PMIC or Power Management Integrated Circuit (PMIC) LED drivers are used to control the performance of LED lighting systems. It controls the current and voltage necessary to drive the LED output. PMIC LED drivers provide dimming, tracking, and sequencing of LED power sources, as well as protection against over current, over temperature and transient events.

ISL1902FAZ-T

ISL1902FAZ-T is an advanced linear LED driver designed to drive 1~10 LEDs in series configuration, at regulated current and with no additional components. It integrated master-slave regulators, providing a very small package solution, yet delivering highly efficient LED performance. The IC utilizes current feedback technique rather than traditional voltage based method allowing the driver to operate within a wide input voltage range (1.6V to 36V). It also enables constant output current, no matter the input voltage.

ISL1902FAZ-T Applications Field

ISL1902FAZ-T is suitable for industrial lighting applications such as automotive headlights, interior decorative lighting, and backlighting for LCD applications. It provides a compact solution for low power LED lighting designs, including architectural, consumer electronics, and automotive exterior lighting applications.

Working Principle of ISL1902FAZ-T

The ISL1902FAZ-T is a current feedback based regulator that works by sensing the current flowing through the high-side FET of the power supply and limiting it by varying the pulse width of the output drive. It utilizes alternating PWM signals to control the power supply pins and the current flowing to the LED load. The ISL1902FAZ-T operates in the following 3 modes:

• Current Sharing Mode: This is the default mode of operation. The LED current is regulated by controlling the ON-time ratio of the outputs.
• Dual Nature Mode: This mode allows the driver to operate in both constant current and constant voltage modes.
• Current Limit Mode: This mode allows the user to program the maximum LED current.

The ISL1902FAZ-T also provides user programmable PWM dimming and the ability to sync the PWM signal to an external clock. It supports 2 types of dimming curves: standard logarithmic and linear.

Conclusion

The ISL1902FAZ-T is a high-performance linear LED driver designed to drive 1~10 LEDs in series configuration. It is suitable for industrial lighting applications such as automotive headlights, interior decorative lighting, and backlighting for LCD applications. It provides a compact solution for low power LED lighting designs, including architectural, consumer electronics, and automotive exterior lighting applications. The driver utilizes current feedback technique rather than traditional voltage based method allowing the driver to operate within a wide input voltage range (1.6V to 36V). It also enables constant output current, no matter the input voltage. The ISL1902FAZ-T is a versatile device and provides a wide range of features such as constant current regulation, dimming, tracking, and protection against over current, over temperature, and transient events. It is a great choice for LED lighting designs.

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