Dialog collaborates with Qualcomm to achieve higher efficiency rapid smartphone charging
January 20, 2014 // Paul Buckley
Dialog Semiconductor plc has unveiled the company's high efficiency AC/DC adapter interface IC for Qualcomm Quick Charge 2.0 power supplies.
Dialogs Quick Charge 2.0 rapid charge AC/DC adapter solution delivers high efficiency up to 83% without the need for a synchronous rectifier as required by competing solutions. For the ultimate in high power density and small form factor, Dialogs Quick Charge 2.0 rapid charge solution can be used with a synchronous rectifier to provide even higher efficiency up to 88%.
The iW620 rapid charge interface IC detects commands from the Quick Charge 2.0-enabled mobile device via the USB cable, then communicates with the iW1760 PWM primary-side controller and configures the power adapter output voltage.
Current sensing is performed by the iW1760 on the primary side, eliminating the need for a secondary-side current sense resistor for an inherently more efficient solution than competing Quick Charge 2.0 wall charger approaches. Primary-side current control also enables low cost implementation of different constant current thresholds for each output voltage.
The iW620 ensures safe operation with programmable, patented active fast output voltage discharge from 9 V or 12 V down to 5 V. So, when the USB cable is unplugged from a Quick Charge 2.0 phone and then used with a non-Quick Charge 2.0 phone, the iW620 rapidly discharges the output voltage down to 5V, to protect the phone from damage.All news
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