PT6908 查看數據表（PDF） - Princeton Technology

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PT6908

High Power LED Driver

Princeton Technology 

DESCRIPTION

PT6908 is a constant-current LED driver IC utilized

constant frequency, controls buck, boost or

buck-boost switch converter. In each control mode,

PT6908 adopts the inductance current continuous

conduction, peak current control mode and the

feedback of the output current. It’s controlled by the

internal transconductance operational amplifier and

external adjustable slope compensation, it is able to

gain the high precision output current in closed loop.

The typical functions of PT6908 such as UVLO (Under

Voltage Lockout), input current limit, open LED

protection, output short circuit protection, output

current precision control, linear dimming, PWM

dimming, etc. In addition, multiple the sync pin of

PT6908s or input the same clock signal, these ICs will

operate on the same frequency.

Input voltage of PT6908 is 9V to 36V, the oscillator

frequency is 25KHz~350KHz that setting by the

external resistors, and the output PWM signal drive

external power NMOS. PWM dimming input can

accept an external control signal with a duty cycle

0~100% and a frequency between 100Hz to a few

KHz.

APPLICATIONS

• LED backlight

• Automotive LED lighting

• Other DC/DC LED drivers

BLOCK DIAGRAM

PT6908

High Power LED Driver

FEATURES

• >90% Efficiency

• Operating voltage: 9V~36V

• Constant-current driver

• Switch control mode: Buck, Boost, Buck-Boost

• Stable operation frequency

• Slope compensation

• Output current closed loop control

• Input current limit, output over voltage protection,

output short-circuit protection

• Linear dimming & PWM dimming

• Synchronization

• Soft start

Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan

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