LM3450
- 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
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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
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3450/A LED Drivers with Active Power Factor Correction & Phase Dimming Decoder datasheet (Rev. D) | 01 May 2013 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 03 May 2013 | ||
| User guide | AN-2098 LM3450 Evaluation Board (Rev. A) | 03 May 2013 | ||
| User guide | AN-2150 LM3450A Evaluation Board (Rev. B) | 03 May 2013 | ||
| Application note | LM3450_A Design Calculator Instructions | 19 Apr 2012 |
Design & development
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LM3450AEV120V30 — LM3450A 120Vac 30W 2 Stage Dimmable LED Driver
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 (...)
LM3450AEV230V30 — LM3450A 230Vac 30W 2 Stage Dimmable LED Driver
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 (...)
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |
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