OB3338C数据手册OB中文资料规格书

描述 Description

OB3338C is a dimmable offline controller with high constant current (CC) precision. It can achieve low system cost for an isolated lighting application by primary side control in a single stage converter.\r
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The proprietary CC control scheme is used. Quasi-resonant (QR) operation and clamping frequency greatly improves the system efficiency. The advanced start-up technology is used to meet the start-up time requirement (<0.5s). The constant output current is compensated for tolerance of transformer inductance variation. And the line compensation is built in OB3338C for high precisely constant output current control.\r
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OB3338C offers a dimmable function, the LED current can be controlled by setting the duty cycle of PWM waveform into the DIM pin.\r
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OB3338C offers comprehensive protection coverage with auto-recovery features including LED open loop protection, LED short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), etc.\r
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OB3338C is offered in SOP8 package.

特性 Features

• Dimmable LED current control\r
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• Primary-side sensing and regulation without TL431 and opto-coupler\r
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• High precision constant current regulation\r
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• Fast start-up\r
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• Quasi-resonant operation\r
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• Built-in line compensation\r
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• LED short circuit protection\r
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• LED open loop protection\r
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• Cycle-by-cycle current limiting\r
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• Built-in leading edge blanking (LEB)\r
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• VDD under voltage lockout with hysteresis\r
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• VDD over voltage protection\r
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• Over temperature protection (OTP)

应用 Application

• LED lighting