Key words:
LED driver, LNK409EG, Powerint, T8 tube
PowerInt's 25W T8 tube lamp LED driver uses a linkswitchtm-pH LNK409EG device, an input voltage 180 VAC to 265 VAC, an output voltage of about 100V, and an output current 250A. The drive is a non-isolated buck-boost stroke, PFC and low THD (less than 25%) and high efficiency (greater than 91%), and IEC61000-3-2 Class C compatible, no control loop compensation and output current detection. This article describes the main indicators, circuit diagrams and materials list of T8 tube LED drivers, circuit diagrams and materials.
T8 25 W, Non-Isolated, Buck-Boost Topology, Power Factor Corrected, Led Driver Using
LinkswitchTM-PH LNK409EG
THISOLATED, POWER FACTOR CORRECTED, LOW THD, HIGH-Efficiency LED Driver Designed to Drive ~ 100 V LED String At 250 Ma from An Input Voltage Range Of 180 Vac To 265 VAC.
The LinkSwitch-PH has been developed to cost effecTIvely implement a single-stage power factor corrected LED driver and primary-side constant-current control. The LinkSwitch-PH controller is opTImized for LED driver applicaTIons and requires minimal external parts. It provides control of The Output Current Through The LED LOAD WITHOUT The Use of an Optocoupler.
The LinkSwitch-PH monolithically integrates the 725 V power MOSFET and controller. The controller consists of an oscillator, PWM, 6 V regulator, over-temperature protecTIon, frequency jittering, cycle-by-cycle current limit, leading edge blanking, and a charge Controller for Output CC (Constant Current) Control.
The LinkSwitch-PH provides a sophisticated range of additional protection features including auto-restart for control loop open / short faults and output short-circuit conditions. The accurate hysteretic thermal shutdown ensures safe PCB temperatures under all conditions.
The non-isolated power factor corrected buck-boost design presented in this report shows how LinkSwitch-PH dramatically simplifies off-line, high-efficiency, power factor corrected LED driver design with very low parts count and enables a Class C harmonic currents compliant implementation of a very high efficiency, high output voltage design This document contains the LED driver specification, schematic, PCB diagram, bill of materials, conducted EMI measurements, thermal measurements, inductor documentation and typical performance characteristics.
Main characteristics of T8 tube LED driver:
DRAMATILY SIMPLIFIES OFF-LINE, POWER FACTOR CORRECTED, LED Driver Design
SINGLE-Stage, Power Factor Corrected and constant current, non-isolated LED Driver
Compact with extremely low component count
High pf >0.9 Across Line and Load
High effectiency >91% AT 230 VAC
Low THD, <25% AT 230 Vac
IEC61000-3-2 Class C Compliant
Eliminates All Control Loop Compensation
No Output Current Sensing Required
Advanced Performance Features
Compensates for Inductance Tolerance
Compensates for Input Voltage Variations
Compensates for Output Voltage Variations
FREQUENCY JITTERING GREATLY Reduces Emi Filter Costs
Advanced Protection and Safety Features
Auto-Restart Protection for Short-Circuit
HYSTERTIC THERMAL SHUTDOWN
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Figure 1. T8 tube LED driver profile (above: top view, middle picture: bottom view, figure below: Containing T8 pipe view)
Main indicators of T8 tube LED driver:
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