PT6901

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

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

BLOCK DIAGRAM