Launched earlier in 2013, the Quick Charge 2.0 protocol enables users to charge mobile devices, such as tablets and cellphone handsets, up to 75% faster than when using conventional USB charging technology.
Power Integrations has developed the ChiPhy family of AC-DC wall-charger interface ICs which, when combined with the company’s AC-DC switcher ICs and simple optocoupler feedback, incorporates all of the necessary elements to add rapid charging functionality to AC-DC wall chargers. The CHY100 IC detects commands from a Quick Charge 2.0-enabled device, and adjusts the output voltage of the AC-DC wall charger to deliver increased power to the device’s battery through a standard USB cable. When plugged into a 5-V USB-powered device without Quick Charge 2.0 capability, the CHY100 IC automatically disables the higher-voltage capability to ensure safe operation and backwards compatibility with older hardware.
An evaluation platform for ChiPhy ICs, DER-381 describes a CV/CC charger power supply capable of up to 24W using the TOPSwitch-JX switcher and CHY100D interface ICs. The PSU operates from universal input and provides selectable output voltages (5, 9, and 12V) with a maximum constant current of 2A. The TOPSwitch-JX IC maintains virtually constant efficiency across a very wide range of output voltages and current load conditions.
DER-381 can be downloaded from Power Integrations at; www.powerint.com/sites/default/files/PDFFiles/der381.pdf