This DC led driver circuit project is based on the LT3519 driver manufactured by Linear Technology fixed frequency step-up DC DC converter designed to drive LEDs. The LT3519 has an integrated Schottky diode and a 750mA low side switch .
The LT3519 DC led driver circuit project has a internal fixed frequency around 400kHz and offer a wide range input voltage from 3V to 30V .
LT3519 LED driver can operate as a constant-voltage source or constant-current source. The LED current is externally programmable with a 250mV sense resistor.
The LT3519 offer other features like : Up to 3000:1 True Color PWM™ Dimming , wide Input Voltage Range ,Transient Protection to 40V , Floating LED Current Sense from 0V to 45V , 45V, 750mA Internal Switch ,Internal Schottky Diode , Constant-Current and Constant-Voltage Regulation ; Boost, SEPIC, Buck-Boost Mode or Buck Mode Topology ; Open LED Protection and Open LED Status Pin , Programmable Undervoltage Lockout with Hysteresis , Fixed Frequency: 400kHz (LT3519) , Internal Compensation , CTRL Pin Provides Analog Dimming , Low Shutdown Current: <1μA .