品佳推出Richtek高整合度USB充电电源适配器解决方案

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