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大聯(lián)大旗下品佳推出基于Richtek（立锜科技） RT7786和RT7207的高整合USB充電電源適配器解決方案。 大聯(lián)大品佳代理的Richtek（立锜科技）推出RT7786+RT7207為一高整合度PWM +USB-PD Controller，它具備許多特征能提升低功率反馳式（Low-power Flyback）變壓器的性能，特別針對于USB充電的應(yīng)用方面，已取得USB-PD 協(xié)會認證。該方案能以最簡化的回路設(shè)計完成。使用RT7786+RT7207將能夠同時實現(xiàn)低成本、體積小、重量輕的產(chǎn)品設(shè)計。 為降低待機功耗，Richtek（立锜科技）采用專有的Green-Mode 設(shè)計模式，以線性降頻方式低于Light-Load 狀態(tài)。使用專有的Green-Mode設(shè)計產(chǎn)品將能輕易的符合電源相關(guān)法規(guī)要求。而RT7207為高整合度IC，同時內(nèi)建CC/CV、LDO、TL431、OVP、OTP、SR、Cable Comp、Charge Pump、PMOS drive、Quick Discharge、Single Fault、PWM Off @ OVP，且不需在額外增加線路。 
圖示1-大聯(lián)大品佳代理的Richtek（立锜科技）RT7786+RT7207USB充電電源適配器解決方案框架圖 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 |
