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发布者:PT4115 发布时间:2012/3/1 阅读:7146次    关键字: PT4115
PT4115-30V,1.2A Step-down LED Driver


PT4115-30V,1.2A Step-down High Brightness LED Driver with 5000:1 Dimming

>>> PT4115 中文规格书:       >>> PT4115 Data Sheet:

>>> PT4115 样品/演示板申请 免费 (sample&demo request) >>>

GENERAL DESCRIPTION
    The PT4115 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected LED efficiently from a voltage source higher than the total LED chain voltage. The device operates from an input supply between 6V and 30V and provides an externally adjustable output current of up to 1.2A. Depending upon the supply voltage and external components, the PT4115can provide more than 30 watts of output power.
    The PT4115 includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts either a DC voltage or a wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches the device into a low current standby state.
    The PT4115 is available in SOT89-5 and ESOP8 packages.

FEATURES
􀁺 Simple low parts count
􀁺 Wide input voltage range: 6V to 30V
􀁺 Up to 1.2A output current
􀁺 Single pin on/off and brightness control using DC voltage or PWM
􀁺 Up to 1MHz switching frequency
􀁺 Typical 5% output current accuracy
􀁺 Inherent open-circuit LED protection
􀁺 High efficiency (up to 97%)
􀁺 High-Side Current Sense
􀁺 Hysteretic Control: No Compensatio
􀁺 Adjustable Constant LED Current
􀁺 ESOP8 package for large output power application

APPLICATIONS
􀁺 Low voltage halogen replacement LEDs
􀁺 Automotive lighting
􀁺 Low voltage industrial lighting
􀁺 LED back-up lighting
􀁺 Illuminated signs
􀁺 SELV lighting
􀁺 LCD TV backlighting

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