OZ9979 схема включения, описание

Микросхема OZ9979, Производитель- O2micro®

FEATURES OZ9979
• High effi ciency DC/DC boost converter controller
• Drives up to 6 strings in parallel
• Enhanced dimming resolution
• Supports 6 equal-delay PWM dimming signals
• Integrated power MOSFET
• Integrated LED current balance control circuit
• Supports external, internal PWM and analog dimming
• PWM dimming frequency synchronized with external signal
• MOSFET over-current protection
• Over-voltage protection
• LED short circuit detection
• Output short circuit/open diode protection
• Thermal protection
• Soft start function

GENERAL DESCRIPTION OZ9979
OZ9979 is a high effi ciency, DC/DC controller that drives up to six strings of LEDs
connected in parallel confi guration; with multiple LEDs in each string connected in
series. It is targeted for notebook backlight applications.
The IC provides six (6) LED current sense inputs in an “OR” confi guration for im-
proved backlight reliability. This allows the backlight to remain functioning in the
event that any string (s) is damaged during normal operation.

Схема включения

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