OZ9998, назначение, описание, схема включения

Микросхемы OZ9998, OZ9998A и OZ9998B. Назначение- LED драйвер, Производитель- O2micro®

OZ9998/98A

FEATURES OZ9998/98A
• OZ9998: Up to 60mA per ISEN channel
• OZ9998A: Up to 80mA per ISEN channel
• High power DC/DC boost converter controller
• Drives up to 8 strings in parallel
• Integrated LED current balance control circuit
• User-defi ned string selection
• External PWM dimming control
• Time-shift PWM phase dimming control for low audible noise
• Multi-chip parallel operation for more than 8 LED strings
• MOSFET over-current protection
• LED short circuit and open string protection
• Thermal protection
• LED fault status output

GENERAL DESCRIPTION OZ9998/98A
OZ9998/98A are high effi ciency, DC/DC controllers that drive up to eight (8) strings
of LEDs connected in parallel confi guration, with multiple LEDs in each string con-
nected in series. They provide eight (8) LED current sense inputs in an “OR” confi gu-
ration to improve backlight reliability. This allows the backlight to remain functioning
in the event that any string (s) is damaged during normal operation.
OZ9998/98A support external Pulse Width Modulation (PWM) dimming control. Plus,
each provides an integrated circuit to balance the current fl ow through each LED
string

OZ9998B

FEATURES OZ9998B
• High power DC/DC boost converter controller
• Drives up to 4 strings in parallel, up to 160mA per string
• Integrated LED current balance control circuit
• External PWM dimming control
• Time-shift PWM phase dimming control for low audible noise
• MOSFET over-current protection
• LED short circuit and open string protection
• Thermal protection
• LED fault status output

GENERAL DESCRIPTION OZ9998B
OZ9998B is a high effi ciency DC/DC controller that drives up to eight strings con-
nected in parallel confi guration with multiple LEDs in each string connected in series.
It provides four (4) LED current sense inputs in an “OR” confi guration to improve
backlight reliability. This allows the backlight to remain functioning in the event that a
string(s) is damaged during normal operation.
OZ9998B supports external Pulse Width Modulation (PWM) dimming control

Схема включения OZ9998/98A

Схема включения OZ9998B

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