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LT3517EUF-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3517EUF-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LT3517 1 3517fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Full-Featured LED Driver with 1.5A Switch Current The LT ®3517 is a current mode DC/DC converter with an internal 1.5A, 45V switch specifically designed to drive LEDs. The LT3517 operates as a LED driver in boost, buck mode and buck-boost mode. It combines a tradi- tional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external components for efficiency or component size. The switching frequency of LT3517 can be synchronized to an external clock signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides up to 5000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio. The LT3517 is available in the tiny footprint 16-Lead QFN (4mm × 4mm) and the16-Pin TSSOP packages. The LT3517 provides a complete solution for both constant-voltage and constant-current applications. ■ 5000:1 True Color PWM TM Dimming Ratio ■ 1.5A, 45V Internal Switch ■ 100mV High Side Current Sense ■ Open LED Protection ■ Adjustable Frequency: 250kHz to 2.5MHz ■ Wide Input Voltage Range: Operation from 3V to 30V Transient Protection to 40V ■ Operates in Boost, Buck Mode and Buck-Boost Mode ■ Gate Driver for PMOS LED Disconnect* ■ Constant-Current and Constant-Voltage Regulation ■ CTRL Pin Provides 10:1 Analog Dimming ■ Low Shutdown Current: <1μA ■ Available in (4mm × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages ■ Display Backlighting ■ Automotive and Avionic Lighting ■ Illumination ■ Scanners , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. Patent Pending. All other trademarks are the property of their respective owners. *Patents Pending. 1A 10μF 15μH 2.2μF 0.1μF 100mΩ 2.2μF VREF ISP TGEN GND VREF VC 16.9k 1MHz 3517 TA01a 0.1μF VIN SHDN CTRL PWM SYNC FB SS RT SW PVIN 24V VIN 3.3V ISN LT3517 TG PWM 1A Buck Mode LED Driver Efficiency PWM DUTY CYCLE (%) 0 40 50 60 70 80 90 100 20 40 60 80 3517 TA01b 100 CTRL = VREF |
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