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LM3402HVMM/NOPB-LM3402HVMR/NOPB
0.5A Constant Current Buck Regulator for High Power LED Drivers
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LM3402, LM3402HVSNVS450F –SEPTEMBER 2006–REVISED OCTOBER 2015
LM3402/HV 0.5-A Constant Current Buck Regulator for Driving High Power LEDs Features 3 DescriptionThe LM3402/HV are monolithic switching regulators Integrated 0.5-A N-channel MOSFET designedto deliver constant currentsto high power• VIN Range from6Vto42V (LM3402) LEDs. Ideal for automotive, industrial, and general• VIN Range from6Vto75V (LM3402HV) lighting applications, they containa high-side N-
channel MOSFET switch witha current limitof 735• 500 mA Output Current Over Temperature mA (typical) for step-down (Buck) regulators.• Cycle-by-Cycle Current Limit Hysteretic control with controlled ON-time coupled• No Control Loop Compensation Required with an external resistor allow the converter output
voltageto adjust as neededto delivera constant• Separate PWM Dimming and Low Power
current to series and series- parallel connectedShutdown
arraysof LEDsof varying number and type, LED• SupportsAll Ceramic-Output Capacitors and dimming by pulse width modulation (PWM),Capacitor-Less Outputs broken/open LED protection, low-power shutdown• Thermal Shutdown Protection and thermal shutdown complete the feature set. VSSOP, SO PowerPAD™ Packages
Device Information(1)2 Applications• LED Drivers• Constant Current Source
(1) Forall available packages, see the orderable addendumat• Automotive Lighting the endofthe data sheet.• General Illumination Industrial Lighting
Typical Application Diagram
