描述 Description

DESCRIPTION
PT6903 is a PFM high brightness LED driver control IC. It allows efficient operation of driver current up to 1.0A output, and the input range is from 7V to 36V. Moreover, PT6903 controls the internal MOS at a modulated switch frequency up to 800KHz. PT6903 drives a single or multiple series LEDs at a constant-current control method; thus, providing constant current light output and enhanced reliability.
PT6903 has linear and PWM dimming functions. Output current to an LED string can be? programmed to any value between its minimum value to its maximum value at the linear dimming control input of PT6903. PT6903 provides a low-frequency PWM dimming input that can accept an
external control signal witha duty cycle of 0~100% and a frequency between 100Hz and a few KHz.FEATURES
?90% efficiency
? Wide input voltage range: 7V to 36V
? Constant current driver
? Applications up to 1.0A
? Linear & PWM dimming
? Thermal shutdown protection
? Over current protection
? Internal 40V power NMOS switch

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

特性 Features

?90% efficiency
? Wide input voltage range: 7V to 36V
? Constant current driver
? Applications up to 1.0A
? Linear & PWM dimming
? Thermal shutdown protection
? Over current protection
? Internal 40V power NMOS switch