IC manufacturers Texas Instruments

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Texas Instruments LM3450

LED Drivers with Active Power Factor Correction and Phase Dimming Decoder

Overview

TopologyFlyback Converter
Input voltage90-135 V
Output 150 V / 0.7 A
IC revisionD

Description

The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintainingexcellent power factor. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This device is ideal for implementing a dimmable off-line LED driver for 10-100W loads.The phase dimming decoder has several unique features. The input-output mapping is programmable for design flexibility, while a dynamic filter andvariable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly whileminimizing extra power loss.The LM3450A is identical to the LM3450 with the exception of one circuit operation. The dynamic hold current is sampled in the LM3450 while itcontinuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is ageneral guideline for choosing the correct device:• Any 120V designs with POUT > 15W - LM3450A• Any 230V designs with POUT > 25W - LM3450A• 120V 2-Stage designs with POUT < 15W - LM3450• 230V 2-Stage designs with POUT < 25W - LM3450

Features

  • Critical Conduction Mode PFC
  • Over-Voltage Protection
  • Feedback Short Circuit Protection
  • 70:1 PWM Decoded From Phase Dimmer
  • Analog Dimming
  • Programmable Dimming Range
  • Digital Angle and Dimmer Detection
  • Dynamic Holding Current
  • Smooth Dimming Transitions
  • Low Power Operation
  • Start-Up Pre-Regulator Bias
  • Precision Voltage Reference

Remarks

  • L1=L2=L3=1mH
  • L4=470uH(Refer Page no=27)

Typical applications

  • Indoor and Outdoor Area SSL
  • Dimmable Downlights,Troffers, and Lowbays
  • Large Form Factor Bulbs
  • Power Supply PFC

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesVINVOut1
(V)
IOut1
(A)
VOut2
(V)
IOut2
(A)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MountSize Samples
750813550SPEC
3 files Active i| Production is active. Expected lifetime: >10 years.MID-OLTI Offline Flyback Transformers for Texas Instruments 90 - 135 V (AC) 50 0.34 12.5 0.08 12.5 55 - 85 1020 1.95:1:0.268 1.5 3750 28.58 29.21 22.86 THT EE25/13/7
Order Code Data­sheet Simu­lation
750813550SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesVINVOut1
(V)
IOut1
(A)
VOut2
(V)
IOut2
(A)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MountSize Samples