AN3290

Conclusions

Doc ID 18038 Rev 1

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Conclusions

A double-output flyback converter using the new ALTAIR04-900, specifically designed for

power line modem systems based on ST7580 (by STMicroelectronics), has been introduced

and the results are presented.

The demonstration board shows good performances in terms of load and line regulation and

the overall efficiency is very good also at light load conditions.

The pre-compliant tests on conducted noise show that the QR mode of operation of the IC

helps to meet the standards, therefore it is possible to reduce the size and the cost of the

EMI filter compared to a fixed frequency IC.

The all-primary sensing control loop circuitry makes this device very competitive in terms of

performance and price thanks of the absence of the optocoupler and any specific secondary

circuitry for CV regulation and overload protection, including a secondary voltage reference

and sense resistor.

Moreover, the 900 V avalanche-rugged power section, and the several protections that this

device has onboard, makes this IC the device of choice for energy metering, 3-phase

auxiliary power supplies and for all applications where the ultra wide-range is required.