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LM3450A Datasheet(PDF) 1 Page - Texas Instruments |
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LM3450A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 39 page LM3450 www.ti.com SNVS681C – NOVEMBER 2010 – REVISED JUNE 2011 LM3450, LM3450A LED Drivers with Active Power Factor Correction and Phase Dimming Decoder Check for Samples: LM3450 1 FEATURES DESCRIPTION The LM3450/50A is a power factor controller (PFC) 2 • Critical Conduction Mode PFC with separate phase dimming decoder. The PFC • Over-Voltage Protection regulates the output voltage while maintaining • Feedback Short Circuit Protection excellent power factor. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz • 70:1 PWM Decoded From Phase Dimmer PWM output. This device is ideal for implementing a • Analog Dimming dimmable off-line LED driver for 10-100W loads. • Programmable Dimming Range The phase dimming decoder has several unique • Digital Angle and Dimmer Detection features. The input-output mapping is programmable • Dynamic Holding Current for design flexibility, while a dynamic filter and variable sampling rate provide smooth uniform • Smooth Dimming Transitions dimming. A dynamic hold circuit ensures that the • Low Power Operation phase dimmer angle is decoded properly while • Start-Up Pre-Regulator Bias minimizing extra power loss. • Precision Voltage Reference The LM3450A is identical to the LM3450 with the exception of one circuit operation. The dynamic hold APPLICATIONS current is sampled in the LM3450 while it continuously operates in the LM3450A. This • Dimmable Downlights, Troffers, and Lowbays difference between the two devices defines the • Large Form Factor Bulbs suitable applications for each. The following is a • Indoor and Outdoor Area SSL general guideline for choosing the correct device: • Power Supply PFC • 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 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2010–2011, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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