OZ9902C View Datasheet(PDF) - O2Micro International
Part Name
Description
MFG CO.
'OZ9902C' PDF : 56 Pages View PDF
OZ9986/9986A
FEATURES
• OZ9986: Boost and Buck converter
• OZ9986A: Buck converter
• High efficiency DC/DC converter controller for LEDs
• Drives up to 6 strings in parallel; number of LEDs in series limited by
external MOSFET(s) rating
• High efficiency LED current balance function
• User-selectable, phase-shift PWM dimming function with 3, 4, 5 and
6 phases
• PWM dimming control signals synchronized with external signal
• Over-voltage and over-current protection
• Soft start function
GENERAL DESCRIPTION
OZ9986/86A are high efficiency, DC/DC controllers that drive up to six (6) strings
connected in parallel configuration, with multiple LEDs in each string connected
in series. Each is targeted for large-size monitor and TV applications.
Each IC provides six (6) LED current sense inputs in an “OR” configuration to
improve backlight reliability. This allows the backlight to remain functioning in
the event that any string (s) is damaged during normal operation.
OZ9986/86A support internal Pulse Width Modulation (PWM) dimming control,
where the PWM dimming signal is phase-shifted by 60 degrees per channel
when all 6 channels are connected. This proprietary feature significantly en-
hances the system performance.
APPLICATIONS
• LCD Monitor
• LCD TV
APPLICATION DIAGRAMS
U.S. Patent #’s 7,498,793; 7,847,783; 7,919,936; 8,248,439; and more patents pending.
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