LT8391IFE

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Part Status:	Obsolete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

LT8391IFE is a high-performance AC-DC LED driver IC with integrated front end that integrates front end and DC-DC buck LED driver together in a single package. The LED driver provides current mode control with constant current and constant voltage output. It has numerous advantages over traditional linear LED driver designs such as higher efficiency and higher power delivery capability. In this article, we will discuss the application field and working principle of the LT8391IFE.

Application Field

LT8391IFE is mainly used in LED lighting applications such as general lighting and industrial lighting fixtures. It is used to drive a wide range of LEDs such as high power white LEDs, RGB LEDs, and common anode or common cathode LEDs. The AC-DC front end efficiently converts the supply voltage to a stable, regulated output voltage, making it ideal for applications that require a high-performance switch-mode power supply. The integrated output current circuitry provides precise adjustment of the constant current output and over-current protection, making it suitable for high power applications.

Working Principle

The LT8391IFE features an AC-DC boost-based front end that converts the input voltage to a stable, regulated voltage output. It also features an output current regulator which provides a constant current output. It is controlled by a control terminal which can be adjusted to deliver a wide range of currents. It also features over-current protection to ensure safe operation of the LED driver. The AC-DC front end consists of a low loss rectifier, an inductor and a Schottky diode connected in series. The output current regulation is achieved through the use of a high performance pulse width modulation (PWM) controller. The PWM controller senses the output voltage and adjusts the output current accordingly.

Conclusion

In summary, the LT8391IFE is a high-performance LED driver IC, with an AC-DC boost-based front end and constant current output. It is ideal for LED lighting applications such as general lighting and industrial lighting fixtures, and can be used to drive a wide range of LEDs. The integrated output current circuitry also provides precise adjustment of the constant current output and over-current protection. Therefore, the LT8391IFE can be used in a wide range of LED based lighting products.

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