AN3290 Datasheet, PDF (1/34 Pages) STMicroelectronics – Reference design for double output SMPS for power line

AN3290
Application Note
Reference design for double output SMPS for power line
modem applications using ALTAIR04-900 primary controller
Introduction
This application note introduces a new “all-primary sensing” switching regulator ALTAIR04-
900, used to build an innovative solution to supply a power line communication.
A demonstration board, implementing a wide-range double-output power supply, has been
developed and the results of its bench evaluation are reported in this document.
The board uses the new ALTAIR04-900, a quasi-resonant (QR) current-mode controller IC
specifically designed for QR ZVS (zero voltage switching at switch turn-on) flyback
converters, which combines a high-performance low-voltage PWM controller chip and a
typical 16 R_DSon, 900 V, avalanche-rugged power MOSFET in the same package.
The device is capable of providing constant output voltage regulation using primary-sensing
constant voltage loop (CV loop). This eliminates the need for the optocoupler and the
secondary voltage reference while still maintaining quite accurate regulation.
Also, using the primary constant current loop (CC loop), it is possible to set the maximum
deliverable output current without any secondary components or current sensor.
April 2011
Doc ID 18038 Rev 1
1/34
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