LM3402 Datasheet | National Semiconductor

Description The LM3402/02HV are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, they contain a high-side N-channel MOSFET switch with a current limit of 735 m A (typical) for step-down (Buck) regulators. Hysteretic control with controlled on-time coupled with an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series - parallel connected arrays of LEDs of varying number and type, LED dimming by pulse width modulation (PWM), broken/open LED protection, low-power shutdown and thermal shutdown plete the feature set. Features Integrated 0.5A N-channel MOSFET VIN Range from 6V to 42V (LM3402) VIN Range from 6V to 75V (LM3402HV) 500 m A Output Current Over Temperature Cycle-by-Cycle Current Limit No Control Loop pensation Required Separate PWM Dimming and Low Power Shutdown Supports all-ceramic output capacitors and capacitor-less outputs n Thermal shutdown protection n MSOP-8 Package n n n n n n n n Applications n n n n n LED Driver Constant Current Source Automotive Lighting General Illumination Industrial Lighting Typical Application © 2006 National Semiconductor Corporation DS201921 .national. Data Sheet 4 U . .. LM3402/LM3402HV Connection Diagram 8-Lead Plastic MSOP-8 Package NS Package Number MUA08A Ordering Information Order Number LM3402MM LM3402MMX LM3402HVMM LM3402HVMMX MSOP-8 MUA08A Package Type NSC Package Drawing Supplied As 1000 units on tape and reel 3500 units on tape and reel 1000 units on tape and reel 3500 units on tape and reel Pin Descriptions Pin(s) 1 2 3 4 5 6 7 8 Name SW BOOT DIM GND CS RON VCC VIN Description Switch pin MOSFET drive bootstrap pin Input for PWM dimming Ground pin Current sense feedback pin On-time control pin Application Information Connect this pin to the output inductor and Schottky diode. Connect a 10 n F ceramic capacitor...