Reference designs for standby power supplies

Power Integrations has published two standby power supply reference designs using its Topswitch-JX IC product family, targeting applications that require more than 90 per cent full-load efficiency.

The company said Topswitch-JX devices feature multi-mode control, minimising power wasted in standby and delivering maximum efficiency over a range of operating loads.

The reference designs target applications that require more than 90 per cent full-load efficiency to meet standards such as the 80 PLUSa 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 and describes a PC standby power supply based on Topswitch-JX Top265EG that operates from 110VDC to 400VDC input and provides >91 per cent efficiency at 12V, 15W.

DER-247, based on Topswitch-JX Top264EG, describes a supply for a similar application operating from 110VDC to 400VDC input and providing >87 per cent efficiency at 5V, 10W.

For TV and other consumable products, the designs make 20mW available to the load for just 100mW of input power.

Topswitch-JX is a highly integrated family of 16 power conversion ICs incorporating a 725V power Mosfet for use in flyback power supplies.

The Topswitch-JX multi-mode control algorithm maximises power efficiency across the entire load range.

High efficiency at full power minimises power wasted during normal operation and reduces the complexity and expense of thermal management on the system.

At low power levels, high efficiency enables adapters with low no-load consumption and maximises power available to the system in standby mode for applications constrained by standards and regulatory controls.

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