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reference designLM3445

Texas Instruments LM3445

Triac Dimmable Offline LED Driver

Overview

TopologyBuck Converter
Input voltage90-135 V
Output 124 V / 0.53 A
IC revisionL

Description

The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with triac dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a triac dim decoder. The dim decoder allows wide range LED dimming using standard triac dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper triac operation by allowing current flow while the line voltage is low to enable proper firing of the triac. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC under-voltage lockout.

Features

  • Triac Dim Decoder Circuit for LED Dimming
  • Application Voltage Range 80VAC – 277VAC
  • Capable of Controlling LED Currents Greater Than 1A
  • Adjustable Switching Frequency
  • Low Quiescent Current
  • Adaptive Programmable Off-Time Allows for Constant Ripple Current
  • Thermal Shutdown
  • No 120Hz Flicker
  • Low Profile 10-Pin VSSOP Package or 14-Pin SOIC
  • Patent Pending Drive Architecture

Typical applications

  • Solid State Lighting
  • Industrial Lighting
  • Commercial Lighting
  • Retro Fit Triac Dimming
  • Residential Lighting

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IR(A)
ISAT,10%(A)
RDC max.(mΩ)
fres(MHz)
Version
ISAT,30%(A)
IR,40K(A)
IRP,40K(A)
Size
SamplesAvailability & Sample
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74477030
SPECWE-PD SMT Power Inductor, 1000 µH, –

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
–
Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
Inductance1000 µH
–
Saturation Current @ 10%0.7 A
DC Resistance1180 mΩ
Self Resonant Frequency1.8 MHz
VersionStandard 
Saturation Current @ 30%0.91 A
Rated Current0.65 A
Performance Rated Current0.98 A
Size1280 
–Check availability
744730392
SPECWE-TI Radial Leaded Wire Wound Inductor, 3900 µH, 0.18 A
Simu­lation
Availability
–
Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-TI Radial Leaded Wire Wound Inductor
Inductance3900 µH
Rated Current0.18 A
Saturation Current @ 10%0.23 A
DC Resistance12000 mΩ
Self Resonant Frequency1.1 MHz
VersionStandard 
Saturation Current @ 30%0.28 A
–
–
Size8075 
–Check availability