基于A8735的超低功耗闪光灯充电方案
基于a8735的超低功耗闪光灯充电方案
allegro 公司的a8735是超低功耗xenon闪光灯充电集成电路,封装尺寸只有2x2mm,关断模式的电流仅为0.5ua,峰值电流1a限制,效率大于75%,很适合用于手机单个锂离子电池充电以及小型照相机.本文介绍了a8735主要特性和优势, 功能方框图,典型应用电路图以及推荐的pcb布局图.
the allegro® a8735 is a xenon photoflash charger ic designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. by using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. this has the additional benefit of reducing leakage currents on the secondary side of the transformer. to extend battery life, the a8735 features very low supply current draw (0.5 μa max in shutdown mode). the igbt driver also has internal gate resistors for minimum external component count. the charge and trigger voltage logic thresholds are set at 1 vhi(min) to support applications implementing low-voltage control logic.
the a8735 is available in an 8-contact 2 mm × 2 mm dfn/mlp package with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. it is lead (pb) free with 100% matte tin leadframe plating.
a8735主要特性和优势:
▪ ultra small 2 × 2 dfn/mlp-8 package
▪ low quiescent current draw (0.5 μa max. in shutdown mode)
▪ primary-side output voltage sensing; no resistor divider required
▪ fixed 1 a peak current limit
▪ 1v logic (vhi(min)) compatibility
▪ integrated igbt driver with internal gate resistors
▪ optimized for mobile phone, 1-cell li+ battery applications
▪ zero-voltage switching for lower loss
▪ >75% efficiency
▪ charge complete indication
▪ integrated 50 v dmos switch with self-clamping protection
图1.a8735功能方框图
图2.a8735单电源应用电路图
图3.a8735带单独偏压电源的应用电路图
图4.a8735推荐的应用电路图
图5.a8735推荐的元件布局图
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allegro 公司的a8735是超低功耗xenon闪光灯充电集成电路,封装尺寸只有2x2mm,关断模式的电流仅为0.5ua,峰值电流1a限制,效率大于75%,很适合用于手机单个锂离子电池充电以及小型照相机.本文介绍了a8735主要特性和优势, 功能方框图,典型应用电路图以及推荐的pcb布局图.
the allegro® a8735 is a xenon photoflash charger ic designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. by using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is eliminated. this has the additional benefit of reducing leakage currents on the secondary side of the transformer. to extend battery life, the a8735 features very low supply current draw (0.5 μa max in shutdown mode). the igbt driver also has internal gate resistors for minimum external component count. the charge and trigger voltage logic thresholds are set at 1 vhi(min) to support applications implementing low-voltage control logic.
the a8735 is available in an 8-contact 2 mm × 2 mm dfn/mlp package with a 0.60 maximum overall package height, and an exposed pad for enhanced thermal performance. it is lead (pb) free with 100% matte tin leadframe plating.
a8735主要特性和优势:
▪ ultra small 2 × 2 dfn/mlp-8 package
▪ low quiescent current draw (0.5 μa max. in shutdown mode)
▪ primary-side output voltage sensing; no resistor divider required
▪ fixed 1 a peak current limit
▪ 1v logic (vhi(min)) compatibility
▪ integrated igbt driver with internal gate resistors
▪ optimized for mobile phone, 1-cell li+ battery applications
▪ zero-voltage switching for lower loss
▪ >75% efficiency
▪ charge complete indication
▪ integrated 50 v dmos switch with self-clamping protection
图1.a8735功能方框图
图2.a8735单电源应用电路图
图3.a8735带单独偏压电源的应用电路图
图4.a8735推荐的应用电路图
图5.a8735推荐的元件布局图
以eSIM为基础能力的连接技术是搅局者还是推动者？
高性能电流输入μModule ADA4355产品概述
电子芯闻早报：微软向小米出售1500项专利
Tractica：2018年全球物流机器人销售额达83亿美元
选择晶振考虑的因素有哪些
基于A8735的超低功耗闪光灯充电方案
三星推出一款限量版Galaxy S10+，Galaxy A8s新粉嫩配色发布
双重绝缘是什么意思_双重绝缘结构
浅谈边缘视频分析
PLC的级别划分标准是怎样的？
武汉火车刷脸进站！人脸识别大行其道，武汉火车站进站只需5秒，提高效率，方便市民，有力打击犯罪份子
语音识别技术在安全领域的应用与挑战
程序员坐牢会被安排写代码吗？
嵌入式项目中的软件数据兼容性
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新的6GHz Wi-Fi技术或将为全球经济带来助推作用
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苹果官方应用：iPhone设备状态一目了然 售后更方便！
怎样才能将人工智能和教育深度融合
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