欧洲ErP调光类LED驱动原边恒压方案OB5686,可用于隔离反激和非隔离降压架构
在智能照明系统中,一般采用恒压+DCDC实现调光调色等控制。随着欧洲新ErP标准的实施,对于LED驱动电源在PF(功率因数)、THC(分次谐波电流)和待机功耗的要求更加严苛:对于>25W调光类产品,要求PF>0.9,待机功耗<0.5W,并且在10%~100%负载功率段均需满足THC的要求;此外,对于照明产品,降低系统成本从而降低产品的价格的需求也一直存在。
针对此应用要求,昂宝电子推出高性价比原边恒压方案OB5686。
图1 OB5686隔离反激系统应用图
OB5686是一款高PF、低谐波电流、低待机功耗、高精度的原边恒压控制器,可应用于隔离反激和非隔离降压架构。OB5686集成数字内核,省去传统方案中的环路补偿电容,降低了系统成本,同时提高了输出负载变化时的响应速度。
OB5686采用多模式准谐振(QR)PWM工作模式,结合具有昂宝专利的THD优化算法控制,实现高PF、低THC。在输出负载半载条件下,仍可满足PF>0.9,且可满足宽负载范围下分次谐波电流的要求。
图2 OB5686系统满载、半载PF特性
图3 OB5686 25~44W系统宽负载范围系统THC特性
OB5686内置高压启动模块,全面采用昂宝电子的“绿色引擎TM”技术,极大程度上降低了待机功耗,提高轻载效率。
图4 OB5686系统待机功耗
OB5686提供完善的保护功能,提高系统可靠性,保护包括:输入电压过压/欠压保护、输出开环保护、输出短路保护、输出过载保护、逐周期过流保护、VDD欠压保护、过温保护等。
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本文由Vicky转载自昂宝电子On-Bright公众号,原文标题为:新品速递:欧洲ErP调光类LED驱动原边恒压方案--OB5686,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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【产品】采用SOP-7封装的自供电恒流/恒压原边反馈控制器3732,内置功率三极管,工作温度范围为-40~+125℃
富满电子推出的3732是低成本恒流、恒压的原边反馈控制器,系统无需供电绕组和供电二极管,极大得降低了生产成本。适用于各种低功耗AC/DC充电器和适配器应用场合。在恒流控制模式中,可以通过改变与CS管脚连接的Rcs电阻阻值来调节输出电流大小。
【产品】国产低成本恒流恒压原边控制器KP211,适于小功率离线式充电器应用
必易微电子的KP211是一款高性能、低成本恒流恒压原边控制器,可提供高精度恒压和恒流输出性能,尤其适合于小功率离线式充电器应用中,典型应用包括:手机充电器、交流适配器、LED照明。
【产品】采用SOP-8封装的原边反馈开关电源芯片TC6536,待机功耗小于75mW、适用5V/2.4A方案
富满电子推出的TC6536是一款低功耗原边反馈(PSR)开关电源芯片,其内部集成了大功率BJT管,适用于隔离型的高效低功耗便携式设备充电器应用。TC6536采用独特具有恒流恒压功能的原边反馈控制技术,以及独特的轻载调频技术降低轻载下芯片自身功耗实现高效应用。
【产品】适用5V、2.0A方案的TC6536GA原边反馈开关电源芯片,待机功耗小于75mW
富满电子推出的TC6536GA是一款低功耗原边反馈(PSR)开关电源芯片,其内部集成了大功率BJT管,适用于隔离型的高效低功耗便携式设备充电器应用。采用独特具有恒流恒压功能的原边反馈控制技术,以及独特的轻载调频技术降低轻载下芯片自身功耗实现高效应用。具有输出线损补偿技术,在大电流下保证足够的输出功率。
【产品】75mW待机的原边反馈控制芯片FS3783CX2,集成BJT,适用于10W以下隔离方案
FS3783CX2是一款采用SOP7封装的高性能隔离型适配器和充电器的控制芯片。通过原边侧的电流和电压检测实现恒流和恒压功能,内置环路稳定性补偿,可以省略TL431和光电耦合器。通过设定外部的限流电阻和变压器原副边匝比来实现恒流输出功能,通过设定FB 的分压电阻和辅助侧匝比来实现恒压功能。
【产品】待机功耗≦75mW的原边反馈控制芯片FS3773CX1G,恒压、恒流精度高 ,适用5V/1A方案
FS3773CX1是一款恒压、恒流的原边反馈控制芯片,内置VCBO为850V的功率三极管,适用于充电器和适配器。采用特有的输出线损补偿技术,可以有效的补偿输出电流在输出线上的损耗压降。
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