STEVAL-ISA133V1 Double output SMPS for power line applications using the ALTAIR04-900 primary controller Data brief The STEVAL-ISA133V1 demonstration 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 , 900 V, DSon 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 maintaining very accurate regulation. Features Also, using the primary constant current loop, it is Universal input mains range: 90 264 V - possible to set the maximum deliverable output ac frequency 45 65 Hz current without using secondary components or current sensor. Double output voltage: 13V 0.55 A and 3.3 V 100 mA peak power The board implements several protection features that considerably increase end-product safety Optoless constant-voltage/constant-current and reliability: auxiliary winding disconnection (or output regulation brownout) detection, shorted secondary rectifier Meets power line communication system detection, and transformer saturation protection, specifications with the ST7580 all of which are auto-restart mode. Average efficiency: > 70% EMI: in accordance with EN55022-Class-B Description The STEVAL-ISA133V1 demonstration board implements a 7.5 W double output wide range mains adapter with constant-voltage/constant- current, designed as an innovative AC-DC adapter to supply a complete power line communication system based on the ST7580. The power supply provides a 13 V output voltage to supply the power line modem (PLM) and the analog circuitry, and a post-regulated 3.3 volts to supply digital circuitry and an optional external microcontroller. April 2013 DocID024356 Rev 1 1/4 www.st.com 4Schematic diagram and electrical characteristics STEVAL-ISA133V1 1 Schematic diagram and electrical characteristics Figure 1. STEVAL-ISA133V1 schematic diagram 9 / 75 X+ 17& 3 36 67 RKP : ) ) 6 & , 1 & &0 3 .( & & & 5 Q) X) X) X) N 59 & 9 9 Q) & , 1 + / 677 / P + 4 /) % 5 9 ,1 7 36 / 67 & & Q) X) & & 5 X) X) 1 & 5 . 8 7 , 5 9 5 , 1 9 7 & &25217/ ) =& % Q) < & 3 &23 0 ,5 () *1 6285& ( 5 5 & Q) & & Q) Q) 5 5 5 1 & N 0 Y Figure 2. Output voltage with 3V3 40 mA Figure 3. Output voltage with 3V3 80 mA F D 9 F D 9 F D 9 F D 9 F D 9 F D 9 F D 9 F D 9 2 SXXW 2XW W Y WXS DJHWOR YORW > DJH 9 9 > P W > HQ UU X F W XS W X 2 P W > QH UU X F W SX W X 2 2/4 DocID024356 Rev 1 (1 &855 *1 / *1 % 7 28