OZ9987 назначение, описание, схема включения

Микросхема OZ9987, назначение- LED драйвер, Производитель- O2micro®

FEATURES OZ9987
• Low cost fl yback controller
• Audio noise free operation
• Low start-up current
• Current mode operation
• Under-voltage lockout
• Secondary over-current protection with frequency foldback
• Integrated synchronized slope compensation
• Soft driver for improved EMI signature
• User-defi ned PWM Frequency
• Leading edge blanking on CS pin
• Constant maximum output power for universal AC input range
• Protection features:
— Clamped GATE output voltage to 178V
— VDD over-voltage protection
— Cycle-by-cycle current limiting
— Secondary output short circuit and over load protection

GENERAL DESCRIPTION OZ9987
OZ9987 is an integrated current mode Pulse Width Modulated (PWM) controller that
is ideal for low power, offl ine, AC/DC fl yback converter applications. The PWM oper-
ating frequency is determined by an external resistor.
With a low start-up current, OZ9987 can utilize a large value start-up resistor to mini-
mize start-up power consumption. The line voltage compensation circuit provides a
constant power limit throughout the universal AC input voltage range.

Схема включения OZ9987

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