品佳推出Richtek高整合度USB充电电源适配器解决方案
发布时间：2016-1-8 10:30
发布者：eechina
关键词：
USB充电
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大联大旗下品佳推出基于Richtek（立锜科技） RT7786和RT7207的高整合USB充电电源适配器解决方案。 大联大品佳代理的Richtek（立锜科技）推出RT7786+RT7207为一高整合度PWM +USB-PD Controller，它具备许多特征能提升低功率反驰式（Low-power Flyback）变压器的性能，特别针对于USB充电的应用方面，已取得USB-PD 协会认证。该方案能以最简化的回路设计完成。使用RT7786+RT7207将能够同时实现低成本、体积小、重量轻的产品设计。 为降低待机功耗，Richtek（立锜科技）采用专有的Green-Mode 设计模式，以线性降频方式低于Light-Load 状态。使用专有的Green-Mode设计产品将能轻易的符合电源相关法规要求。而RT7207为高整合度IC，同时内建CC/CV、LDO、TL431、OVP、OTP、SR、Cable Comp、Charge Pump、PMOS drive、Quick Discharge、Single Fault、PWM Off @ OVP，且不需在额外增加线路。 
图示1-大联大品佳代理的Richtek（立锜科技）RT7786+RT7207USB充电电源适配器解决方案框架图 RT7786 Features • Designed for adaptive power • Wide Vdd Range ( 7V~38V) • Adaptive Vo OVP , UVP for < 3V • Feedback Loop Fault Protection • Adaptive Loop Gain for Loop Stability • Adoptive Current Limit to meet LPS • High Efficiency: • CCM/QR Hybrid Control • Power Saving < 30mW @ 5V • Other Protection: • Vdd OVP, OCP, OLP, OTP, Adjustable Constant Output Power , Brown in/out protection, Secondary Rectifier Short Protection , Adaptive Vo OVP RT7207 Features • USB PD 2.0 Type-C Compliant , Other protocol is optional • Highly Integration: • ARM M0 MCU embedded • Transceiver embedded for BMC. • Programmable Type C current mode setting. (default, 1.5A, 3A) • CV and CC Control • Synchronous rectifier driver and controller (Operate in both DCM and CCM for wide output voltage range (RT7207T) • BLD pin for quick discharge • Shut regulator and Programmable cable compensation built in • Charge pump built in for wide VDD operation range ( 3V to 20V ). • USBP pin to directly drive external isolation P-MOSFETs . • Green mode in standby for power saving • Protection: • OTP, Adaptive OVP, Programmable UVP, SCP |
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