OZ9987 назначение, описание, схема включения

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

• 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

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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OZ99XX O2Micro
OZ99XX O2Micro
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