NATIONAL SEMICONDUCTOR LM3433 Common Anode Capable High Brightness LED Driver with High Frequency Dimming handbook
Update: 29 September, 2023
LM3433 is an adaptive constant on-time DC/DC buck constant current controller that provides a constant current for illuminating high power LEDs. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy. The high frequency capable architecture allows the use of small external passive components and no output capacitor while maintaining low LED ripple current. Two control inputs are used to modulate LED brightness. An analog current control input is provided so the LM3433 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction. The other input is a logic level PWM control of LED current. The PWM functions by shorting out the LED with a parallel switch allowing high PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3433 is available in a low profile LLP-24 package.
Brand: National
File format: PDF
Size: 339 KB
MD5 Checksum: 657A63197534384163BD6A35CBFA6364
Publication date: 04 May, 2012
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