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Ultra-low Standby/No-load Power Solutions

Power Integrations makes it easy to meet the standby power requirements of Ecodesign Directive (EuP), ENERGY STAR, and other emerging energy-efficiency standards.

Of specific interest to standyby and no-load power supply designers are the ways in which PI products help meet standards requirements for EC Ecodesign Lots 6 (Standby and Off-mode) and 7 (External Power Supplies). For more information, see:


Power Integrations ICs deliver extremely low standby/no-load power with energy saving features

The graph below shows input power vs. output power as load increases for different PI product families. (For greater detail, click on the image.)

graph 1

 

The following shows the application of CAPZero, SENZero, and LinkZero-AX to achieve ultra-low, no-load power of <10 mW.



Design Examples

Design Documents Design
Ideas		 Design
Example
Reports
1.5 W Zero No-Load Power   DER-260
27 W Power Supply   DER-235
30 W High Efficiency Standby with 12 V Output   DER-246
3 W Power Supply with Less Than 10 mW No-Load   DER-227
3.25 W Low Cost Constant Current/Constant Voltage Charger   DER-207
15 W Power Supply with Less Than 20 mW No-Load   DER-228
27 W Low Profile, Low Standby Consumption Power Supply DER-229
65 W Power Supply with Less Than 100 mW No-Load DI-196 DER-196

Recommended Product Families

IC Product
Family		 Typical Circuit
Configuration		 Data Sheets Application
Notes
LinkZero™-AX Flyback LinkZero-AX Datasheet NA
SENZero™ AC Power Supply SENZero Datasheet NA
CAPZero™ AC Power Supply CAPZero Datasheet Product family application note.
LinkSwitch™-II Flyback LinkSwitch-II Datasheet AN-44
LinkSwitch™-XT Flyback LinkSwitch-XT Datasheet AN-40
TinySwitch™-III Flyback TinySwitch-II Datasheet AN-42
TinySwitch™-PK Flyback TinySwitch-PK Datasheet AN-42
TOPSwitch™-HX Flyback TOPSwitch-HX Datasheet AN-43
TOPSwitch™-JX Flyback TOPSwitch-HX Datasheet AN-47



Power Consumption at No-Load

1.5 W Zero No-Load Flyback Power Supply

graph image
No-load Input Power in PD mode vs. Input Line Voltage,
25 ºC, 50 Hz. 30 Minute Dwell Time at 230 VAC Prior to Taking Measurements.
 schematic image
Circuit schematic 1.5 W non-isolated flyback power Supply using LinkZero™-AX


15 W PC Standby

graph image
Careful transformer design reduced power consumption of this 15 W solution from 29 mW no-load to less than 20 mW
 schematic image
15 W power supply using TinySwitch-III;
less than 20 mW input at 230 Vrms no-load


30 W PC Standby

graph image
Zero Load Input Power vs. Input Line Voltage, Room Temperature, 60 Hz.
 schematic image
High Efficiency 12 V, 30 W Standby Power Supply Using TOPSwitch®-JX TOP265EG


For information on these designs and to receive detailed design reports, please contact your local PI representative or refer to the design example reports and product families listed above.