DESCRIPTION
PT6905 is a three-stages (two-stages) dimming high brightness LED driver control IC. It allows efficient operation of driver current up to 800mA output, and the input range is from 7V to 36V. Moreover, PT6905 controls the internal MOS at a modulated switch frequency up to 1MHz. PT6905 drives a single or multiple  series  LEDs at a constant-current control method; thus, providing constant current light output and enhanced reliability. PT6905 uses innovative three or two stages dimming mode, it can be realized by ON/OFF the power supply switch easily. The output current will be set at 1/3, 2/3 or 1 times of the normal value (1/3 or 1 times of normal value in two stage dimming mode). Every time the power supply switch ON/OFF, the output current will be transferred to the next state.

FEATURES
• Three(or two) stages dimming
• >90% Efficiency
• Wide input voltage range: 7V to 36V
• Constant current driver
• Applications up to 0.8A
• Thermal shutdown protection
• Over current protection
• Open circuit protection
• Under voltage lockout
• Internal 40V power NMOS switch

APPLICATIONS
• DC/DC LED driver
• Low voltage industrial LED lighting
• Low voltage halogen replacement LEDs
• Decorative LED lighting