Adapter design exceeds Energy Star requirements

An open reference design for a 5W AC/DC adapter for Constant Current, Constant Voltage (CCCV) mobile phone chargers has been introduced by ON Semiconductor. The GreenPoint reference design exceeds Energy Star requirements for single voltage AC/DC and AC/AC external power supplies revision 1.1, for high active-mode power efficiency and low standby-mode power consumption. It can easily be modified for use with low power, single output-voltage adapters for cordless phone chargers.

This reference design solution achieves active-mode efficiency of 70 percent at 120Vac and 65 percent at 230Vac, exceeding Energy Star guidelines of 63.5 percent for both input voltages. In standby mode, the solution consumes only 75mW at 120Vac and 90mW at 240Vac, again exceeding Energy Star guidelines of 0.5W for both input voltages. In addition, the design complies with FCC Part 15 Level B EMI requirements.

The 5W AC/DC adapter reference design addresses all functional blocks of the adapter, utilizing several of ON Semiconductor's power management devices and drawing from its leading discrete component portfolio to achieve superior efficiency performance.

ON Semiconductor is one of the exhibitors in the upcoming IIC-China 2008.