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[原创]ST EVL400W-EUPL7 400W开关电源解决方案

关键词:电源管理 开关电源 SMPS ST EVL400W-EUPL7

时间:2020-08-31 15:24:25       来源:中电网

ST公司的EVL400W-EUPL7是基于L4984, L6699和SRK2001的12V/400W开关电源(SMPS)演示板.而L4984D电流模式PFC控制器和线路调制的固定关断时间(LM-FOT)控制.专用的LM-FOT调制器允许升压PFC转换器固定频率操作,只要是工作在连续导通模式(CCM).EVL400W-EUPL7演示板是12V 400W转换器,特别设计用于AC/DC适配器,具有宽输入火线电压范围,在轻负载时有非常低的功耗和良好的平均效率.演示板基于两级方案:基于CCM升压PFC控制器(采用L4984)的前端PFC预调节级和下行LLC谐振半桥转换器(采用L6699设计).在次级边,同步整流(SR)由SRK2001来实现,保证了有非常高的整流效率,因此仅需要小型的散热器.本文介绍了L4984D主要特性和框图,演示板EVL400W-EUPL7主要特性,电路图,以及演示板中的主板,控制板和整流板的材清单,PCB设计图.

 

The L4984D is a current-mode PFC controller operating with line-modulated fixed-off-time (LM-FOT) control. A proprietary LM-FOT modulator allows fixed-frequency operation for boost PFC converters as long as they are operated in CCM (continuous conduction mode).

The chip comes in a 10-pin SO package and offers a low-cost solution for CCM-operated boost PFC pre-regulators in EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans from few hundred W to 1 KW and above.
The highly linear multiplier includes a special circuit, able to reduce the crossover distortion of the AC input current, that allows wide-range-mains operation with a reasonably low THD, even over a large ..

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