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LM3450

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LED-Treiber mit aktiver Leistungsfaktorkorrektur und Phasendimmungsdecoder

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LM3450

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Produktdetails

Input voltage type AC/DC Topology Boost, Flyback Vin (min) (V) 85 Vin (max) (V) 20 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), Reverse Phase Number of channels 1 Rating Catalog
Input voltage type AC/DC Topology Boost, Flyback Vin (min) (V) 85 Vin (max) (V) 20 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), Reverse Phase Number of channels 1 Rating Catalog
TSSOP (PW) 16 32 mm² (5 mm × 6.4 mm)
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintaining excellent 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 and variable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing 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 it continuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is a general 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

The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintaining excellent 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 and variable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing 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 it continuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is a general 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
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM3450/A LED Drivers with Active Power Factor Correction & Phase Dimming Decoder datasheet (Rev. D) 01.05.2013
Whitepaper Common LED Functions and LED Driver Design Considerations 21.09.2020
Auswahlhilfe Power Management Guide 2018 (Rev. R) 25.06.2018
Benutzerhandbuch AN-2098 LM3450 Evaluation Board (Rev. A) 03.05.2013
Anwendungshinweis AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03.05.2013
Anwendungshinweis LM3450_A Design Calculator Instructions 19.04.2012

Design und Entwicklung

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Evaluierungsplatine

LM3450AEV120V30 — LM3450A Dimmbare LEDs-Treiber 120 Vac 30 W 2 Stufen

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

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Evaluierungsplatine

LM3450AEV230V30 — LM3450A 230 Vac, 30 W, dimmbarer LED-Treiber mit 2 Stufen

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

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Berechnungstool

SLUC351 — LM3450_A Design Calculator

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TSSOP (PW) 16 Ultra Librarian
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