DESCRIPTION
●The LT®3756, LT3756-1 and LT3756-2 are DC/DC control lers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fxed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize effciency, performance or external component size.
●FEATURES
●■ 3000:1 True Color PWM™ Dimming
●■ Wide Input Voltage Range: 6V to 100V
●■ Output Voltage Up to 100V
●■ Constant-Current and Constant-Voltage Regulation
●■ 100mV High Side Current Sense
●■ Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
●■ Adjustable Frequency: 100kHz to 1MHz
●■ Open LED Protection
●■ Programmable Undervoltage Lockout with Hysteresis
●■ Improved Open LED Status Pin (LT3756-2)
●■ Frequency Synchronization (LT3756-1)
●■ PWM Disconnect Switch Driver
●■ CTRL Pin Provides Analog Dimming
●■ Low Shutdown Current: <1µA
●■ Programmable Soft-Start
●■ Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages
●APPLICATIONS
●■ High Power LED Applications
●■ Current Limited Constant Voltage Applications
●■ Battery Charging
