EISA 2007
The Energy Independence and Security Act of 2007 was passed in December of 2007 and addresses minimum efficiency standards for external power supplies, also known as linear or switching adapters. This law stipulates that external power supplies manufactured on July 1, 2008 and beyond meet certain minimum efficiency criteria as defined below. All CUI external adapters currently comply with these regulations.

Efficiency Standards for External Power Supplies
Minimum efficiency criteria
Active mode is defined as when the power supply’s input is connected to line voltage ac and its output is connected to a dc or ac load drawing a portion of the product’s power output. Depending on the power rating for the power supply, it must meet the minimum efficiency criteria outlined below.

Active Mode Energy Consumption

output power on adapter label	minimum average efficiency percentage
0 to ≤ less than 1 watt	≥ 0.50 * output power on adapter label
> 1 to ≤ 51 watts	≥ [0.09 * Ln (output power on adapter label )] + 0.50
> 51 watts	≥ 0.85

The power supply must also meet a requirement for when its input is connected to a line voltage ac but its output is not connected to a load. Depending on the power output of the supply, it must keep its energy consumption below the following values.

Energy Consumption Criteria for No Load Mode

output power on adapter label	maximum power consumption in no-load mode
0 to < 250 watts	≤ 0.5 watts

Efficiency Standards for Battery Chargers
A final ruling by July 1, 2011, will decide energy conservation standards for battery chargers.