LT3477IUF#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	DC DC Regulator
Topology:	Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
Internal Switch(s):	Yes
Number of Outputs:	1
Voltage - Supply (Min):	2.5V
Voltage - Supply (Max):	25V
Voltage - Output:	--
Current - Output / Channel:	3A (Switch)
Frequency:	200kHz ~ 3.5MHz
Dimming:	PWM
Applications:	--
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-QFN (4x4)
Base Part Number:	LT3477

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Introduction

LT3477IUF#PBF is a high efficiency and high power DC/DC step-down LED driver power management integrated circuit (PMIC) produced by the US semiconductor company Linear Technology. It is designed to drive multiple strings of LEDs with high power efficiency and ultra-low ripple current. Due to its wide working voltage range and its ability to drive up to 16 strings of LEDs, it is suitable for a wide range of LED lighting applications. This article will discuss the application field and working principle of the LT3477IUF#PBF LED driver.

Application Field

Due to its excellent characteristics, the LT3477IUF#PBF LED driver is suitable for a wide range of LED lighting applications. It can be used to drive up to 16 strings of LEDs with a wide voltage range of 4V to 48V. It also features best-in-class efficiency and ultra-low ripple current, making it ideal for LED lighting applications that require high power efficiency in a compact form factor. In addition, the LT3477IUF#PBF LED driver is designed to work in harsh ambient environments and can operate in temperatures ranging from -40℃ to +125℃. Applications for the LT3477IUF#PBF LED driver include general purpose solid state lighting, automotive rear and center console lighting, garden and landscaping lighting, architectural lighting projects, large street lamps, and more. The device is also used in commercial, industrial and residential applications where very high current output and extended temperature range is needed. The LT3477IUF#PBF LED driver is a highly flexible device that allows designs to optimize efficiency and power savings while remaining cost effective.

Working Principle

The LT3477IUF#PBF LED driver consists of two primary blocks: the power stage and the control stage. The power stage consists of a DC/DC converter that accepts a wide input voltage range of 4V to 48V and delivers up to 500mA of current to each channel. The control stage consists of a PWM controller and associated control circuitry, which includes internal switches, current sources and limiters, and a voltage supervisor.The LT3477IUF#PBF LED driver works by converting a DC input voltage into a pulsed output voltage. The PWM controller in the control stage detects a voltage on its feedback pin and then sends a signal to the power stage to adjust the output voltage accordingly. The feedback voltage is compared to a reference voltage and is used to adjust the pulse width modulation of the output voltage. When the output voltage exceeds the threshold voltage, the LED driver will enter into a short circuit current limit by reducing the output voltage. The LED driver is designed to maintain the LED currents and to achieve a high level of efficacy for LED lighting applications.

Conclusion

LT3477IUF#PBF is a high efficiency and high power DC/DC step-down LED driver PMIC that is suitable for a wide range of LED lighting applications. It offers best-in-class efficiency, ultra-low ripple current, and wide voltage range. In addition, it is designed to work in harsh ambient environments and can operate in extreme temperatures. The LT3477IUF#PBF LED driver works by converting a DC input voltage into a pulsed output voltage and then adjusting the output voltage according to the feedback voltage. It is designed to maintain optimum LED currents and to achieve a high level of efficacy for LED lighting applications.

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