Power Integrations Unveils DI-84 Charger Reference Design

June 06, 2005 by Jeff Shepard

Power Integrations Inc. (San Jose, CA), a supplier of high-voltage integrated circuits used in power conversion semiconductor technology, unveiled a 3 W charger reference design that consumes less than 30 mW of no-load power. Typical applications for the design include cell phones, cordless phones, PDAs, MP3 players and other battery-powered portable equipment.

The new DI-84 design claims consumption of 97% less no-load energy than traditional linear, transformer-based power supplies, and beats the mandatory California Energy Commission regulations, which permit up to 500 mW of no-load energy consumption. The no-load power performance of the DI-84 is achieved through a combination of reducing the IC’s internal power consumption, the low bias current design of the secondary feedback circuits, and efficient transformer design.

The 5 V, 600 mA charger is built around Power Integrations’ TinySwitch®-II power conversion IC family, and operates over the universal input-voltage range from 85 Vac to 265 Vac. The TinySwitch-II ICs also include over-voltage protection, under-voltage lockout and hysteretic thermal shutdown that protects the entire circuit from over-temperature faults. Additionally, the solution meets CISPR-22 Class B conducted EMI limits without requiring a Y capacitor.