IS32FL3738-ZLA3-TR

Voltage - Output:	--
Supplier Device Package:	28-eTSSOP
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Applications:	General Purpose
Dimming:	PWM
Frequency:	1MHz
Current - Output / Channel:	84mA
Series:	Automotive, AEC-Q100
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	2.7V
Number of Outputs:	8
Internal Switch(s):	No
Topology:	--
Type:	Linear
Part Status:	Active
Packaging:	Cut Tape (CT)

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Introduction

IS32FL3738-ZLA3-TR is a LED driver chip, developed by ISSI and manufactured by Texas Instruments. It is one of the power management integrated circuit (PMIC) products from ISSI, and its main function is to provide an accurate and controlled level of current to LED lighting systems.

Application Field

The IS32FL3738-ZLA3-TR chip is mainly applied in LED lighting systems and fixtures, including, but not limited to, MR16 and MR19 LED lamps, spot, down and cove lighting, landscape lighting, strip lights, and other LED lighting products. It is designed to handle nine constant current LED channels, and can be programmed to suit different LED lighting systems. This chip is suitable for a wide range of voltage input system, ranging from 8V to 82V. It also features adjustable output current range, which makes the chip suitable for a wide range of LED lighting systems.

Working Principle

The IS32FL3738-ZLA3-TR chip comprises of a 9-bit DAC and PWM signal-to-dimming control interface. The DAC regulates the amount of current to each of the nine constant current outputs, which ensures precise and uniform current flow even if the load or the input voltage changes. It also has current-mode regulation, that is responsible for the precise output current for achieving uniform brightness over a range of input voltages. The PWM signal-to-dimming control interface offers dimming capabilities, that allows the users to control the brightness of the given LED lighting systems precisely. The chip has a minimum active turn-on power consumption and a power efficiency of more than 95%. The ancillary circuits present on the chip consist of an adjustable soft start circuit, protection circuit, a boost control circuit and a logic input control circuit. The adjustable soft start circuit is responsible for controlling the inrush current and ramp-up time of the LED lighting system on power-up. The protection circuit makes sure that the LED lighting system is protected against short circuit, over temperature and overvoltage conditions. The boost control circuit helps in providing an accurate output voltage using PWM. The logic input control circuit helps to control the LED driver chip via a logic signal.

Conclusion

IS32FL3738-ZLA3-TR is one of the PMIC – LED driver chips from ISSI, and is mainly applied in LED lighting systems for providing an accurate and controlled level of current to the system. Its DAC regulates the amount of current and the PWM signal-to-dimming control interface ensures precise dimming capabilities. It also has an adjustable soft start circuit, protection circuit, a boost control circuit and a logic input control circuit, each assigned to perform a specific function to ensure superior performance of the LED lighting system.

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