iW661 TM NDA Confidential AC/DC Secondary-Side Synchronous Rectification and Rapid Charge Interface Controller for AFC with DLNK Technology 1 Description The iW661 is an AC/DC secondary-side combo controller for Samsung Adaptive Fast Charging (AFC) which includes USB interface, secondary-to-primary digital communication and synchronous rectification functions in a single IC. The iW661 allows rapid charging of AFC enabled mobile devices (MDs). The iW661-11 also supports Qualcomm Quick TM Charge 2.0 (QC 2.0) and automatically distingugishes between the AFC and QC 2.0 protocols. It resides on the secondary side of an AC/DC power supply and allows the adapter to be configured for multi-level output voltage and current. The iW661 uses Dialogs proprietary secondary-to-primary digital link (DLNK) communication technology. When paired with Dialogs primary-side controller, the iW1791, the iW661 transmits all necessary information for rapid charge through a single optocoupler, including output voltage requests, output current limits, output voltage undershoot, out- put over-voltage, and fault and reset signals. The iW661 is also an advanced synchronous rectifier (SR) controller with an integrated MOSFET driver, enabling discontinuous mode flyback converters with high efficiency operation. The device works with an external power MOS- FET to replace the main rectifying diode on the secondary side of a flyback converter, improving ecffi iency by reducing secondary-side conduction losses. Dialogs digital adaptive turn-off control technology minimizes turn-off deadtime, eliminating the need for an additional Schottky diode that is typically needed in parallel with the synchronous MOSFET in conventional synchronous rectifiers. In addition, the iW661 implements Dialogs proprietary D- impedance detection and D+/D- OVP to address soft short issues in the output cables and connectors that can be caused by such things as a poor or loose connection between the cable connector and the socket, contamination in the USB connector, or a worn-out cable, and provides protection against the damages. The iW661 can be used in Dialogs primary-side controlled AC/DC systems to achieve fast volt- age transition, low no-load power consumption, and fast dynamic load response. TM Qualcomm Quick Charge 2.0 is a product of Qualcomm Technologies, Inc. 2 Features Supports Qualcomm Quick Charge 2.0 Class A High Proprietary secondary-to-primary digital communication Voltage Dedicated Charging Port (HVDCP) with transmits all information for rapid charge with a voltage configuration of 5V and 9V in iW661-11 and single optocoupler: output voltage requests, output automatically differentiates between AFC and QC 2.0 current limits, output voltage undershoot, over-voltage protection, and other fault and reset signals Proprietary D- impedance detection and D+/D- over- voltage protection (OVP) address soft short issues Lossless MOSFET V sensing for SR timing control DS in the output cables and connectors and provides with digital adaptive turn-off control protection against damages Optimized 5V MOSFET gate driver Programmable active fast discharge from a high High-voltage drain sensing up to 100V with no voltage to 5V at MD unplug or from a high voltage level additional external clamping circuits required to a lower level upon request with built-in switch or external switch Supports Samsung AFC for multi-level output voltages and currents Intelligent low power mode enables < 20mW no-load power consumption Backward compatible with USB Battery Charger Specification Revision 1.2 (USB BC1.2) Dedicated On-chip temperature sensing circuit Charging Port (DCP) 10-lead MSOP package 3 Applications AFC AC/DC adapters for smart phones, tablets, and other portable devices Datasheet Rev. 1.4 31-Jan-2019 www.dialog-semiconductor.com 1 of 19 2019 Dialog Semiconductor CONFIDENTIALiW661 TM NDA Confidential AC/DC Secondary-Side Synchronous Rectification and Rapid Charge Interface Controller for AFC with DLNK Technology L + + C V OUT OUT N U2 iW661-01 U1 R1 iW1791-06 1 10 DRAIN DRV 1 GND V 8 CC 2 9 DIS V IN 2 DLNK GATE 7 3 8 D- V CC 3 SOURCE 6 V 4 7 SENSE SOURCE GND 4 CFG I 5 SENSE 5 D+ OUT 6 D- R2 D+ Figure 3.1 : iW661 15W Typical Application Circuit for Multi-Level Output Voltage and Current (Using iW1791 as Primary-Side Controller. Achieving < 20mW No-Load Power Consumption.) Datasheet Rev. 1.4 31-Jan-2019 www.dialog-semiconductor.com 2 of 19 2019 Dialog Semiconductor CONFIDENTIAL