STEVAL-ISA175V1 STMicroelectronics

S T E VA L - I S A 1 7 5 V 1 9.4 W, 15 V-5 V-3.3 V, three output isolated flyback converter for smart meter and power line systems using the VIPER26HD Data brief Description The STEVAL-ISA175V1 evaluation board implements a three output isolated flyback specifically designed to supply the STCOMET smart meter and powerline communication system. The board is developed using the VIPER26HD offline high-voltage converter by STMicroelectronics. The device features an 800 V avalanche-rugged power section, PWM operation at 115 kHz with frequency jittering for lower EMI, current limiting with adjustable set point, on-board soft-start, safe auto-restart after a fault condition and low standby power. Features The power supply provides 15 V 550 mA rms (700 mA peak) to the power line modem (PLM) Triple output voltage: 15 V 0.55 Arms (0.7 and the analog circuitry, a post-regulated 5 V A peak), 3.3 V 200 mA and 5 V 100 100 mA and a 3.3 V 200 mA supply through a mA dedicated DC-DC converter connected on the 15 Extended AC mains input voltage range: 90 V rail for digital circuitry and other low voltage V to 440 V AC AC parts. Meets STCOMET smart meter and power line communication system specs The power supply is designed to operate across EMC with EN55022, EN61000, EN61000-4- an extended 90 to 440 V mains input voltage AC 4, EN61000-4-5, EN61000-4-6 range to also be used with a phase-to-phase RoHS compliant connection in a three-phase network. The board can be used in a stand-alone configuration or with the dedicated STCOMET development kit and the PCB layout is specifically designed to fit inside a real meter. April 2016 DocID029273 Rev 1 1/5 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagrams STEVAL-ISA175V1 1 Schematic diagrams Figure 1: Main PSU circuit schematic GSPG2704161040SG 2/5 DocID029273 Rev 1 Vdc TF L2 750314352 rev1 D3 L3 +15V BR DBLS208GRD 470uH R1 STPS2200U 4.7uH F1 NTC1 220k R5 AC C10 C11 2 1 220k C22 470uF 100uF CM D6 C5 1uF C25 2A 16ohm 10mH SMA6J100A 1nF 220uF 3 2 C3 R2 R6 D1 GND C1 33uF 220k IC2 Vpre 220nF-X1 4 1 LDK220M50R 100 MRA4007 D4 +5V NTC2 L1 C2 AC IN OUT 2 1 220nF D2 R8 STPS1H100A INH 1mH GND 16ohm R3 220k C12 C13 C6 10 NC 3.3uF C7 STPS1150M 100pF C24 10uF C4 10uF 33uF R4 220k VDD DRAIN R9 FB 470 Vdc +15V Vpre CONTROL R7 IC1 47 VIPER26HD COMP LIM GND OPTO SFH610A R14 D5 R15 R11 R12 22k 18V 133k NC NC C14 R10 C8 C9 NC 220k 100pF 22nF OPTO C23 SFH610A Ref TS432ILT 2.2nF-YCAP R13 12k