N-Channel Controllers For Constant Current LED Drivers

The LM3421 LM3423 devices are versatile high voltage LED driver controllers. With the capability to be configured in a Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and an input operating voltage rating of 75V, these controllers are ideal for illuminating LEDs in a very diverse, large family of applications. Adjustable high-side Current Sense with a typical sense volt- age of 100mV allows for tight regulation of the LED current with the highest efficiency possible. Output LED current reg- ulation is based on peak current-mode control with predictive Off-Time Control. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation. The LM3421 LM3423 include a High-Voltage startup Regulator that operates over a wide input range of 4.5V to 75V. The internal PWM Controller is designed for adjustable switching frequencies of up to 2.0MHz, thus enabling compact solu- tions. Additional features include: zero current shutdown, precision reference, Logic compatible DIM input suitable for fast PWM dimming, cycle-by-cycle current limit, and thermal shutdown. The LM3423 also includes an LED output status flag, a fault flag, a programmable fault Timer and a Logic input to select the polarity of the dimming output driver. By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM3421Q0MHX/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 150
LM3421Q1MHX/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 125
LM3421MHX/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 125
LM3421MH/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 125
LM3421Q1MH/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 125
LM3421Q0MH/NOPB Texas Instruments N-Channel Controllers for Constant Current LED Drivers 16-HTSSOP -40 to 150
LM3421 's PackagesLM3421 's pdf datasheet
LM3423
LM3421MH
LM3421MHX
LM3423MH
LM3423MHX




LM3421 Pinout, Pinouts
LM3421 pinout,Pin out
This is one package pinout of LM3421,If you need more pinouts please download LM3421's pdf datasheet.

LM3421 Application circuits
LM3421 circuits
This is one application circuit of LM3421,If you need more circuits,please download LM3421's pdf datasheet.


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