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Pulse transformers enable compact switch-mode power supplies

Posted: 03 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:pulse? pulse engineering? on semicondouctor? ncp1200? power controller?

Offering compatibility with ON Semiconductor's NCP1200 low-voltage offline controller for power-conversion applications, the PF0082 and PF0091 transformers come in a new package that enables reduced cost and speeds time-to-market for small, portable power supplies.

The PF0082 has an auxiliary winding, while the PF0091 does not. With their PQ26/25 platform, the transformers enable what is claimed to be the most compact switch-mode power designs in the 50W range. Applications include low-power, universal offline power supplies for portable equipment, such as digital cameras, external computer peripherals, power tools, and standby power supplies in PCs and A/V equipment.

The PF0082 is designed with a primary to secondary turns ratio of 1:0.166 and an auxiliary winding with a 1:0.15 turns ratio. Other turns ratios can be developed upon request.

Both devices feature a primary inductance value is 7305H, with leakage inductance down to 205H. They exhibit dc resistance values of 250 milliohms (primary) and 20 milliohms (secondary). Operating temperature range is from -200C to 850C. The insulation system provides a minimum 1.5kVrms electrical isolation, while meeting UL 94V-0 flammability requirements.

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