Powerint Lnk409eg 25W T8 Tube LED Drive Solution

key word:

LED drive, lnk409eg, powerint, T8 tube

The 25W T8 tube lamp LED driver of powerint company adopts linkswitchtm-ph lnk409eg device, with input voltage of 180 VAC to 265 VAC, output voltage of about 100V and output current of 250A. The driver adopts non isolated step-down boost topology, PFC, low THD (less than 25%) and high efficiency (more than 91%), which is compatible with iec61000-3-2 class C, This paper introduces the main indexes, circuit diagram and material list of T8 tube LED driver

T8 25 W, Non-Isolated, Buck-Boost Topology, Power Factor Corrected, LED Driver Using

LinkSwitchTM-PH LNK409EG

This document describes a non-isolated, 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 a n 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:

ï‚· Dramatically simplifies off-line, power factor corrected, LED driver design

ï‚· Single-stage, power factor corrected and constant current, non-isolated LED driver

ï‚· Compact with extremely low component count

ï‚· High PF >0.9 across line and load

ï‚· High efficiency >91% at 230 VAC

ï‚· Low THD, ï‚· IEC61000-3-2 CLASS C compliant

ï‚· Eliminates all control loop compensation

ï‚· No output current sensing required

ï‚· Advanced performance features

ï‚· Compensates for inductance tolerance

ï‚· Compensates for input voltage variations

ï‚· Compensates for output voltage variations

ï‚· Frequency jittering greatly reduces EMI filter costs

ï‚· Advanced protection and safety features

ï‚· Auto-restart protection for short-circuit

ï‚· Hysteretic thermal shutdown

2011-11-28 22:11:58 upload

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2011-11-28 22:11:58 upload

2011-11-28 22:11:58 upload

2011-11-28 22:11:58 upload

2011-11-28 22:11:58 upload

2011-11-28 22:11:58 upload

Powerint Lnk409eg 25W T8 Tube LED Drive Solution 1

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