PT6901 Datasheet, PDF (1/4 Pages) Princeton Technology Corp – High Power LED Driver

DESCRIPTION
PT6901 is an open loop current mode control high
brightness LED driver IC. PT6901 can be programmed
to operate in either constant frequency or constant
off-time mode. The frequency can be programmable
set as 30KHz~300KHz. The PT6901 is ideally suited
for buck LED drivers. It exports PWM signal to control
the external MOS. The PT6901 supply voltage input
range is from 8V to 12V, and the output current can be
programmed between a few milliamps and up to more
than 1.0A. PT6901 can drive a single or multiple series
LEDs, and provide reliability constant current output by
detecting LED peak current.
The functions of linear and PWM dimming are
included. PT6901 provides a low-frequency PWM
dimming input that can accept an external control
signal with a duty cycle of 0~100% and a frequency
between 100Hz and a few KHz. Output current to LED
string can be programmed to any value between 0 to
its maximum value at the PWM dimming control input
of PT6901. Also, a 0~240mV linear dimming input can
be used for linear dimming of the LED current.
APPLICATIONS
• DC/DC or AC/DC LED driver
• Backlight LED driver
• Constant-Current driver
• Charger
BLOCK DIAGRAM
PT6901
High Power LED Driver
FEATURES
• Constant-current driver
• >85% Efficiency
• Constant frequency or constant off-time
operation
• 8V to 12V input range
• LED string from one to hundreds diodes
• Applications from a few mA to more than 1A LED
driver
• PWM low-frequency dimming and linear dimming
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