LT8391EFE

Voltage - Output:	60V
Base Part Number:	LT8391
Supplier Device Package:	28-TSSOP-EP
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Applications:	Automotive, Lighting
Dimming:	Analog, PWM
Frequency:	150kHz ~ 650kHz
Current - Output / Channel:	--
Series:	--
Voltage - Supply (Max):	60V
Voltage - Supply (Min):	4V
Number of Outputs:	1
Internal Switch(s):	No
Topology:	Step-Down (Buck), Step-Up (Boost)
Type:	DC DC Controller
Part Status:	Obsolete
Packaging:	Tube

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Introduction

PMIC - LED Drivers are solid-state, semiconductor integrated circuits (IC) components and devices used to energize and regulate the power flowing in and out of Light-Emitting Diodes (LEDs). LEDs are often used to provide illumination and as indicators in automotive lighting, smart lighting, LCD backlighting, and signage applications. LED drivers provide the critical interface between LED and the LED power supply. The LT8391EFE is a 3-channel constant current LED PWM dimming driver which features high efficiency and high accuracy. This article will focus on the application field and working principle of the LT8391EFE PMIC - LED Driver.

Application

The LT8391EFE is a compact and cost-effective 3-channel LED driver for powering and dimming white, monochromatic and RGB LEDs. With its constant current regulation, no heat sink is required in most applications which can simplify LED light design. It enables LED light systems to provide ideal white LED illumination with a wide dimming range. LT8391EFE is ideally suited for a variety of LED lighting applications such as residential, commercial, automotive and industrial applications. The LT8391EFE is designed to provide an adjustable constant current output to each LED at up to 700mA per channel. The output current level can be programmed using the 8-bit I2C digital interface. The LT8391EFE can provide an adjustable dimming range of up to 100:1 with a built-in PWM dimmer. It also features wide input voltage range of 4–35 V and cycle−by−cycle current limit with a separation between the minimum and maximum duty cycle level. Its high efficiency can help reduce power consumption, as well as heat production.

Working Principle

The LT8391EFE is a 3-channel dimmable LED driver. It uses a constant current regulation architecture to precisely control the forward current of LEDs connected to its output channels. The device includes a latched output current limit circuit, cycle-by-cycle current limit and short-circuit protection. The LT8391EFE includes a fixed frequency PWM dimming function to generate a wider dimming range. The I2C interface allows the user to adjust the brightness of each channel by setting the PWM duty cycle. This PWM dimming scheme allows up to 100:1 dimming ratio with excellent color consistency.The LT8391EFE operates in a wide 4–35 V input voltage range and is designed to drive up to 3 series connected LEDs at 700mA per channel. The device features a current mode control with the adjustable soft start time. The closed-loop architecture of the LED driver accurately regulates LED current to within ±3% accuracy. The device also features current-limit latch protection and over temperature shutdown.

Conclusion

The LT8391EFE is a 3-channel LED PWM dimming driver. The device provides adjustable constant current output at up to 700mA per channel and dimming range of up to 100:1 with a built-in PWM dimmer. It is ideal for a variety of LED lighting applications such as residential, commercial, automotive and industrial applications. With its constant current regulation, no heat sink is required in most applications which can simplify LED light design. The LT8391EFE provides an adjustable soft start time, excellent current accuracy and current-limit latch protection.

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