STEVAL-L6983IV1

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基于L6983I的38V、10W同步iso-buck转换器评估板

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STEVAL-L6983IV1评估板基于意法半导体的L6983I和38 V、10 W同步iso-buck转换器，用于隔离应用。

可以精确调节初级输出电压，而隔离的次级输出由给定的变压比衍生而来。无需光耦合器。

初级受电能力可达-4.5 A（即使在软启动期间），允许适当的能量转移到次级侧，并实现可跟踪的次级输出软启动。

控制回路基于峰值电流模式结构，器件在强制PWM下工作。390 ns的消隐时间过滤了由变压器漏感导致的振荡，使解决方案更加稳定可靠。

L6983I采用紧凑型QFN-16 3 x 3 mm封装，带内部补偿功能，从而使设计复杂性和尺寸降至最低。

可以在200 kHz - 1 MHz范围内对开关频率进行编程，同时能够以可选扩展频谱来改善EMC。

EN引脚提供启用/禁用功能。禁止之后，典型的关断电流是2 µA。一旦拔出EN引脚，器件就被启用，会有1.3 ms内部软启动。

L6983I采用“电源正常”的开路集电极，以监测FB电压。两个功率元件上的逐脉冲电流检测实现了有效的恒定电流保护和热关断，防止热耗散。由于初级反向电流限制，次级输出受到保护以防止出现短路。

评估板能够产生一个隔离的未调节电压，并允许使用后整流调制生成双电压（可于PCB底部布线，未安装元件）。

  • 所有功能

    • 专为iso-buck拓扑而设计
    • 4至38 V工作输入电压
    • 初级输出电压调节
    • 无需光耦合器
    • 4.5 A初级侧峰值拉/灌电流
    • 峰值电流模式结构，器件在强制PWM下工作
    • 390 ns消隐时间
    • 25 µA工作静态电流
    • 可编程开关频率为200 kHz至1 MHz。通过低ESR电容器保持稳定：最低2 µF
    • 内部补偿网络
    • 2 μA关断电流
    • 内部软启动
    • 使能
    • 过电压保护
    • 热保护
    • 以可选扩展频谱改善EMC
    • “电源正常”
    • 与外部时钟同步
    • QFN16 3 x 3 mm 封装

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The current status of a product:
Active: Product is in volume production
Evaluation: Product is under characterization. Limited Engineering samples available
Preview: Product is in design stage
Target: Product is in design feasibility stage.No commitment taken to produce
Proposal: Marketing proposal for customer feedback.No commitment taken to design or produce
NRND: Not Recommended for New Design.Product is in volume production only to support customers ongoing production.Marketing description of the package type.Compliancy of the device with industry requirement domains (IRD)The RoHS status of a product:
ECOPACK 1: Initial grade to identify European RoHS compliant products.
ECOPACK 2: New grade to identify brominated chlorinated and antimony oxide flame retardant free products.
ECOPACK 3: Halogen free RoHS exemptions free products.
(*): ECOPACK 2 version available upon request.
(**): Some versions still existing in ECOPACK 1 or not compliant.Compliancy with WEEE Directive (2012/19/EU)The current status of a product:
Active: Product is in volume production
Evaluation: Product is under characterization. Limited Engineering samples available
Preview: Product is in design stage
Target: Product is in design feasibility stage.No commitment taken to produce
Proposal: Marketing proposal for customer feedback.No commitment taken to design or produce
NRND: Not Recommended for New Design.Product is in volume production only to support customers ongoing production.Budgetary PriceMain country of assembly or fabrication of the product.ECCNs are five character alpha-numeric designations used on the Commerce Control List to identify dual-use items for export control purposes. ECCNs are five character alpha-numeric designations used on the Commerce Control List to identify dual-use items for export control purposes.