Reference design meets Qualcomm’s Quick Charge 2.0 smartphone charger spec
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