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PSU reference designs are efficient in standby

Power Integrations has published two standby power supply reference designs using its TOPSwitch-JX high-voltage, direct-off-line conversion IC product family that incorporate 725-V power MOSFETs, and form the basis of flyback power supplies. The ICs offer multi-mode control, minimising power wasted in standby and delivering good efficiency over a wide range of operating loads. The new reference designs target applications that require more than 90% full-load efficiency to meet such standards as the 80 PLUS Gold or Silver PC specifications, EuP Lot 6 standby rules, or the new California requirements for TV power usage.

DER-246 is a general-purpose evaluation platform comprising a PC standby power supply based on TOPSwitch-JX TOP265EG that operates from 110 VDC to 400 VDC input and provides over 91% efficiency at 12V, 15W.

DER-247, based on TOPSwitch-JX TOP264EG, describes a supply for a similar application operating from 110 VDC to 400 VDC input and providing over 87% efficiency at 5V, 10W. For TV and other consumer products, the designs make 20 mW available to the load for 100 mW of input power.

—by Graham Prophet

Power Integrations, www.powerint.com/standby.