LYT0002D Integrated Circuits (ICs)

Series:	LYTSwitch™-0
Packaging:	Cut Tape (CT)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	AC DC Offline Switcher
Topology:	Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
Internal Switch(s):	Yes
Number of Outputs:	1
Voltage - Supply (Min):	85VAC
Voltage - Supply (Max):	308VAC
Voltage - Output:	--
Current - Output / Channel:	146mA
Frequency:	66kHz
Dimming:	--
Applications:	--
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width), 7 Leads
Supplier Device Package:	8-SO

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LYT0002D Application Field and Working Principle

PMIC - LED Drivers

LED lighting technology has seen fantastic growth in recent years as more consumers are starting to adopt this energy efficient and long-lasting lighting source. LED lights are now being used in a wide variety of applications and require different kinds of power supplies. LYT0002D is a member of the extended fourth-generation LED driver family from Fairchild Semiconductor and is designed to provide superior dimming performance and full dimming compatibility with current LED drivers. It offers both leading and trailing edge PWM (pulse-width modulation) dimming support and is the first LED driver to employ two-phase dimming. It is the ideal choice for Luminaire manufacturers who seek full dimming compatibility and superior dimming performance for each LED driver implementation.

LYT0002D Overview

The LYT0002D is a constant-current LED DC/DC boost converter designed to provide a simple and efficient solution for driving multiple strings of LEDs in series. It features an integrated 600V Power MOSFET and driver that utilizes Fairchild Semiconductor Smart Control technology for optimized phase-cut dimming. The LYT0002D features an adjustable output voltage range of up to 500V, an Input Operating Voltage Range of 5V-420V and an operating power range of 6W-20W. The output current is also adjustable, and is capable of providing up to 500 mA of continuous current. The LYT0002D is also equipped with numerous protection features to ensure safe operation. It includes overvoltage, overcurrent, over temperature, and short circuit protection.

LYT0002D Working Principle

The LYT0002D is a DC/DC boost converter consisting of two stages: an internal voltage regulator and MOSFET switch working in concert with a control logic unit. The voltage regulator operates in a mode similar to that of a traditional linear voltage regulator, but utilizes a MOSFET switch to control the output voltage. The voltage regulator is controlled by a control logic unit which monitors and maintains the output voltage and current levels. The control logic unit is programmed to maintain a constant output current, independent of output voltage fluctuations. This feature, combined with the integrated MOSFET power switch, reduces power dissipation and improves efficiency.The MOSFET switch is also connected to the PWM control logic, allowing the device to be used for pulse-width modulation (PWM) dimming. The PWM control logic is capable of switching the MOSFET at 1000kHz, allowing for more precise dimming control and superior dimming performance.

LYT0002D Features and Benefits

The LYT0002D is capable of providing superior dimming performance with both leading and trailing edge PWM dimming as well as two-phase dimming. It provides up to 500V output voltage and up to 500 mA current, and is capable of operating at 6W-20W power range. Additionally, the LYT0002D features an extensive list of protections and diagnostic features to ensure reliable operation, including protection for overvoltage, overcurrent, overtemperature and short-circuit.The LYT0002D provides dimming flexibility with both leading and trailing edge modulation and two-phase dimming. This reduces the cost of implementation and simplifies operations for designers as it eliminates the need for external passives. The LYT0002D also eliminates external current limiter components, reducing component count and enhancing overall system performance and reliability.In summary, the LYT0002D is the ideal choice for lighting design engineers seeking dimming flexibility, superior dimming performance, extended lifetime, and superior reliability. It provides adjustable output voltage and current ranges, protection features and diagnostic capabilities, making it an excellent solution for high-current LED lighting applications.

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