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LT3592IDDB-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3592IDDB-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3592 1 3592fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming The LT®3592 is a fixed frequency step-down DC/DC con- verter designed to operate as a constant-current source. An external sense resistor monitors the output current allowing accurate current regulation, ideal for driving high current LEDs. The output current can be dimmed by a factor of 10 using an external signal for nighttime brake lights. The high switching frequency offers several advantages by permitting the use of a small inductor and small ceramic capacitors. Small components combined with the LT3592’s 10-pin DFN leadless surface mount package save space and cost versus alternative solutions. The constant switching frequency combined with low-impedance ceramic capaci- tors result in low, predictable output ripple. A wide input voltage range of 3.6V to 36V makes the LT3592 useful in a variety of applications. Current mode PWM architecture provides fast transient response and cycle-by-cycle current limiting. Thermal shutdown provides additional protection. 50/500mA Two Series Red LED Driver n Wide Input Voltage Range Operation from 3.6V to 36V n Resistor Adjustable 400kHz–2.2MHz Switching Frequency n Shorted and Open LED Protected n Internal Switch Current Sense Resistor n External Resistor Programs LED Current, Pin Selects 10:1 Ratio n 50mA/500mA LED Current Settings n Catch Diode Current Sense to Prevent Runaway at High VIN n Small Thermally Enhanced 10-Lead DFN (2mm × 3mm) and MSOP-10 Packages n Automotive Signal Lighting n Industrial Lighting n Constant-Current, Constant Voltage Supplies Efficiency for 2 Red LEDs, L = 10μH, 900kHz 10μH 51k 3592 TA01a 4.7μF 1μF 0.4Ω 10k 0.1μF VIN SHDN BRIGHT RT BOOST SW DA CAP OUT VFB LT3592 GND ON BRAKE 140k 900kHz + 200/20mV – VIN 7V TO 32V L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. INPUT VOLTAGE (V) 4 100 95 90 60 75 70 65 80 85 55 50 20 12 24 3592 TA01b 28 16 8 BRIGHT 500mA |
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