LM3431QMH

• Product Introduction

 peculiarity   LM3431Q/LM3431AQ Automotive AEC - Q100 Standard Class 1 Qualified (-40°C to 125°C Operating Junction Temperature) Grade product 3-channel programmable LED current High-precision linear current regulation Analog and digital PWM dimming control Dimming frequency up to 25kHz > 100:1 contrast ratio Integrated boost controller 5V - 36V input voltage range Adjustable switching frequency up to 1MHz LED short circuit and open circuit protection Selectable fault shutdown or automatic restart Programmable fault delay Programmable cycle-by-cycle current limiting Output overvoltage protection No noise Enable pins LED over-temperature shutdown input Thermal shutdown TSSOP - 28 pads exposed, encapsulated   illustrate The LM3431 is ideal for LED backlit panels that drive a three-channel linear current controller combined with a boost switch controller to drive critical application spaces. The LM3431 drivers 3 external NPN transistors or MOSFETs to provide a high-accuracy constant current of 3 LED strings. The output current is adjustable to drive strings in excess of 200 mA. The expandable LM3431 drives up to 6 LED strings. The boost controller drives an external NFET's input voltage boost regulation switch between 5V and 36V. The LM3431 features LED cathode feedback to minimize adjustment margins and optimize efficiency. The DIM input pin controls the brightness of the LED from an analog or digital control signal. Dimming frequencies up to 25 kHz may have a contrast ratio of 100:1. It is possible to have a contrast ratio of 1000:1 at lower dimming frequencies. The LM3431 eliminates audible noise and maintains constant output voltage regulation in LED dimming. Other features include LED short-circuit and open-circuit protection, fault delay/error flag, cyclic current limiting, thermal shutdown ICs, and LED arrays. LM3431A enhancements reduce the amount of LED current that offsets the higher voltge accuracy.   apply Car infotainment display Small to medium format display