OZ9986 назначение, описание, схема включения
Микросхемы OZ9986 и OZ9986A, назначение- LED драйверы
FEATURES OZ9986
• OZ9986: Boost and buck converter
• OZ9986A: Buck converter
• High effi ciency DC/DC converter controller
• Drives up to 6 strings in parallel; number of LEDs in series limited by external
MOSFET rating
• Supports up to 3 phase-shift drive outputs for boost converter
• High effi ciency switching mode LED current balance
• 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
OZ9986/86A are high effi ciency, DC/DC controllers that drive up to six (6) strings
connected in parallel confi guration with multiple LEDs in each string connected in
series. They are targeted for large-size monitor and TV applications.
They provide six (6) LED current sense inputs in an “OR” confi guration 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. Plus,
each provides an integrated circuit to balance the current fl ow through each LED
string.
Схема включения OZ9986
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