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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3421 Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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LM3421 Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
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1 / 24 page  January 26, 2009 LM3421, LM3423 N-Channel Controllers for Constant Current LED Drivers General Description 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. Features ■ V IN range from 4.5V to 75V ■ 2% Internal reference voltage (1.235V) ■ Current sense voltage adjustable from 20mV ■ High-side current sensing ■ 2Ω MOSFET gate driver ■ Dimming MOSFET gate driver ■ Input under-voltage protection ■ Over-voltage protection ■ Low shutdown current, I Q < 1µA ■ Fast (50kHz) PWM dimming ■ Cycle-by-cycle current limit ■ Programmable switching frequency ■ LED output status flag (LM3423 only) ■ Fault timer pin (LM3423 only) ■ TSSOP EP 16-lead package (LM3421) ■ TSSOP EP 20-lead package (LM3423) Applications ■ LED Drivers ■ Constant-Current Buck-Boost Regulator ■ Constant-Current Boost Regulator ■ Constant-Current Flyback Regulator ■ Constant-Current SEPIC Regulator ■ Thermo-Electric Cooler (Peltier) Driver Typical Application Circuit 30067331 Boost LED Driver © 2009 National Semiconductor Corporation 300673 www.national.com |
Ähnliche Teilenummer - LM3421 |
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Ähnliche Beschreibung - LM3421 |
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