ATX12VO (12V Only) Desktop Power Supply
Design Guide
Power Supply Efficiency for Energy Regulations – ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score – RECOMMENDED
The efficiency of the power supply should be tested at nominal input voltage of 115 VAC input and 230 VAC input, under the load conditions defined in the form factor specific sections, and under the temperature and operating conditions defined in Chapter 7. The loading condition for testing efficiency represents fully loaded systems, typical (50%) loaded systems, and light (20%) loaded systems. For systems being sold into the state of California that meet the High Expandability Computer definition (details at the referenced CEC website below) are required to meet the efficiency target list in Table 4-21: CEC PC Computers with High Expandability Computers.
Visit ENERGY STAR* Computers Ver.8 (ES v8) website for more details:
Visit CEC* website for more details:
- energycodeace.com/content/reference-ace-t20-tool, then select section “(v) Computers…”
Table 4-20: ENERGY STAR* Efficiency versus Load
Loading | Full Load (100%) | Typical Load (50%) | Light Load (20%) | 10% Load | PFC @ 50% Load | Remarks |
RECOMMENDED Minimum Efficiency | 82% | 85% | 82% | 80% | ≥0.9 | ENERGY STAR* v8 for 500 W and below |
RECOMMENDED Minimum Efficiency | 87% | 90% | 87% | 80% | ≥0.9 | ENERGY STAR* v8 for above 500 W |
Table 4-21: CEC PC Computers with High Expandability Computers1 - Efficiency versus Load
Loading | Full Load (100%) | Typical Load (50%) | Light Load (20%) | PFC |
REQUIRED Minimum Efficiency for 115V PSU | 87% | 90% | 87% | ≥0.9 @ 50% load |
REQUIRED Minimum Efficiency for 230V PSU | 88% | 92% | 88% | ≥0.9 @ 50% load |
- Details about High Expandability Computers definition check CEC computer regulation.
The RECOMMENDED minimum efficiency levels shown in Table 4-20 are required for internal power supplies within the ENERGY STAR* for Computers Version 8.0 specification.