PT6908
High Power LED Driver
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.
FEATURES
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>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
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Linear dimming & PWM dimming
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Synchronization
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Soft start
APPLICATIONS
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LED backlight
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Automotive LED lighting
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Other DC/DC LED drivers
BLOCK DIAGRAM
Tel: 886-66296288
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Fax: 886-29174598
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http://www.princeton.com.tw
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2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PTC [ PRINCETON TECHNOLOGY CORP ]
