GENERAL DESCRIPTION
The LD1611 is a continuous mode inductive step-down converter, designed for driving single or multiple series connected High Power LEDs with external switching transistor. It operates from an input voltage range of 7V to 40V and provides an externally adjustable output current up to 1.5A depending upon input voltage and external components. The LD1611 has regulator and output current sensing circuit, which uses an external resistor to set the nominal average output current. The LED dimming can be controlled via pulse width modulation (PWM) through DIM pin. Additionally, to ensure the system reliability, the LD1611 has internal thermal shutdown circuit.

FEATURES
• 7V ~ 40V input range generates maximum 1.5A output constant current.
• Regulation voltage is 4.5V.
• Over temperature thermal protection
• Over voltage circuit protection
• External dimming control PIN
• Package : 8-pin SOP

APPLICATIONS
• MR16 lighting
• DC/DC LED driver
• Automotive lighting
• Offline LED lamps