LYT5228D

Introduction to the

LYTSwitch?- 5 ® products series is very suitable for single stage power factor correction constant-current LED applications, such as light bulbs, tubes and the application of ballast.

Each device integrates a high-voltage power MOSFET and one for the control of continuous conduction mode, and can control of frequency and conduction time to implement the controller.The controller also provides a quick (by cycle) current limiting, input and output over-voltage protection and advanced thermal management circuits.

Using switch tube is located in the lower part of the switch topology, using electric during quiet source pins on the heat dissipation, coupled with the application of frequency modulation technology, make the whole system can achieve very low EMI.This can reduce the size of the input filter element, thus greatly reduce the audio noise.

Table 1 summarizes has three different output power level and two MOSFET voltage options, can according to need to select the corresponding cost optimization model, at the same time EcoSmart ™ switch technology can ensure that each device type in every load conditions to achieve maximum efficiency.

The product features

Single-stage PFC + combined precision constant current output

• Accuracy is better than that of plus or minus 3% of the constant current
• Power factor > 0.9
• Under the condition of low THD, in a typical input and output < 10%
• In the optimization design efficiency can reach above 90%
• High switch frequency and DCM (discontinuous conduction mode) allows the use of smaller magnetic components

Design flexibility

• Support buck, buck - boost, tap step-down, booster and isolation or unfenced flyback topology.
• Two MOSFET voltage options and three output power level, can choose the best suitable devices for specific applications

The highest reliability

• No large capacity electrolytic or photoelectric isolating device, can prolong the service life
• Comprehensive protection function
  • The input and output over-voltage protection
  • Open loop to protect
• Advanced thermal control
  • Thermal characteristics of the output power derating allow in the exceptionally high ambient temperatures can still provide lighting output
  • Shut off the sluggish overheating characteristics under the condition of the failure to provide protection