Reference design for double output SMPS for power line modem applications using ALTAIR04-900 primary controller
The document introduces an 'all-primary sensing' switching regulator, the ALTAIRO4-900, designed for quasi-resonant (QR) ZVS flyback converters. It combines a low-voltage PWM controller chip with a 16 Rpgon, 900 V avalanche-rugged power MOSFET in a single package.
A demonstration board implementing this design was developed to supply a complete power line communication system based on the ST7580 modem. The reference design provides two outputs: a 13 V analog supply for the modem and circuitry, and a post-regulated 3.3 V digital supply for microcontrollers.
| AC main input voltage | 85 to 265 Vac |
|---|---|
| Mains frequency | 50 to 60 Hz |
| Output voltage 1 | 13 V |
| Output current 1 (Rx mode) | 12 mA |
| Output current 1 (Tx mode) | 35 to 550 mA |
| Output voltage 2 | 3.3 V |
| Total rated output power | 7.48 W |
It is an all-primary sensing switching regulator specifically designed for QR ZVS flyback converters to supply power line communication.
No, the primary sensing method eliminates the need for the optocoupler and secondary voltage reference.
The maximum output power in TX mode is 4.2 W.