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  • TI TPS54383双路异步转换器应用方案
    http://www.ic72.com 发布时间:2009/11/3 14:51:09

        TI公司的TPS54383" style="color:blue;text-decoration:none;font-weight:normal;">TPS54383 和TPS54386是双输出异步降压DC/DC转换器,输入电压从4.5V到28V,输出电流可高达3A,输出电压则在0.8V和输入电压的90%之间.主要应用在机顶盒,数字TV,DSP电源和消费类电子产品.

        TI 3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET

        The TPS54383 and TPS54386 are dual output, non-synchronous buck converters capable of supporting 3-A output applications that operate from a 4.5-V to 28-V input supply voltage, and require output voltages between 0.8 V and 90% of the input voltage.

        With an internally-determined operating frequency, soft start time, and control loop compensation, these converters provide many features with a minimum of external components. Channel 1 overcurrent protection is set at 4.5 A, while Channel 2 overcurrent protection level is selected by connecting a pin to ground, to BP, or left floating. The setting levels are used to allow for scaling of external components for applications that do not need the full load capability of both outputs.

        The outputs may be enabled independently, or may be configured to allow either ratiometric or sequential startup sequencing. Additionally, the two outputs may be powered from different sources.

        主要特性:

        4.5-V to 28-V Input Range

        Output Voltage Range 0.8 V to 90% of Input Voltage

        Output Current Up to 3 A

        Two Fixed Switching Frequency Versions:

        TPS54383: 300 kHz

        TPS54386: 600 kHz

        Three Selectable Levels of Overcurrent Protection (Output 2)

        0.8-V 1.5% Voltage Reference

        2.1-ms Internal Soft Start

        Dual PWM Outputs 180° Out-of-Phase

        Ratiometric or Sequential Startup Modes Selectable by a Single Pin

        85-m  Internal High-Side MOSFETs

        Current Mode Control

        Internal Compensation (See Page 16)

        Pulse-by-Pulse Overcurrent Protection

        Thermal Shutdown Protection at +148°C

        14-Pin PowerPAD™ HTSSOP package

        应用:

        Set Top Box

        Digital TV

        Power for DSP

        Consumer Electronics


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