OZ9989 схема включения, описание
Микросхема OZ9989, Производитель- O2micro®
FEATURES OZ9989
• High frequency DC/DC power converter controller
• Drives up to 3 strings in parallel
• Integrated power MOSFET
• Integrated LED current balance control circuit
• Fixed 1.3MHz switching frequency
• External PWM dimming
• MOSFET over-current protection
• Over-current protection for each string
• Output short circuit detection
• Open diode, over-voltage and thermal protection
• Soft start function
GENERAL DESCRIPTION OZ9989
OZ9989 is a high effi ciency, DC/DC controller with an integrated power MOSFET that
drives up to three strings of LEDs connected in parallel confi guration; with multiple
LEDs in each string connected in series. It is targeted for netbook backlight applica-
tions.
The IC provides three (3) LED current sense inputs in an “OR” confi guration for
improved backlight reliability. This allows the backlight to remain functioning in the
event that any string (s) is damaged during normal operation.
OZ9989 uses an external Pulse Width Modulation (PWM) signal for the dimming
control function.
Схема включения OZ9989
Описание микросхем серии OZ99XX в формате PDF, скачать
