STEVAL-ISA197V1

STEVAL-ISA197V1 12 V, 7.8 W isolated flyback converter based on VIPer114LS Data brief Description The STEVAL-ISA197V1 evaluation board implements a 7.8 W (12 V / 0.65 A) isolated flyback wide range mains developed for general purpose applications. The core of the application is the innovative VIPer114LS IC, designed for smart power supplies incorporating green energy management. The device is a high-voltage converter that intelligently integrates an 800 V rugged power MOSFET with PWM current-mode control. VIPer114LS operates at fixed frequency 60 kHz Features with frequency jittering to meet standards Universal input mains range: 90 265VAC, regarding electromagnetic disturbance. The frequency: 50 60 Hz multiple protections on the device, including Output voltage: 12 V pulse skip mode to avoid flux-runaway, delayed Output current: 0.65 A overload, max duty cycle counter, input or output overvoltage and thermal shutdown improve the Very compact size reliability and safety of the design. Stand-by mains consumption: < 20 mW at 230V AC The main characteristics of the evaluation board Average efficiency: > 81% are its small size and minimal BOM, high EMI: according to EN55022-Class-B efficiency and low standby consumption. RoHS compliant Extremely low consumption under the no-load condition is ensured thanks to burst mode operation, which reduces the average switching frequency and minimizes all frequency-related losses. June 2017 DocID030756 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISA197V1 1 Schematic diagram Figure 1: STEVAL-ISA197V1 circuit schematic 2/4 DocID030756 Rev 1 T1 L1 STPS2H100UF L2 12V-0.65 A 5 6 470H D3 3.3H BR R5 C3 C1 C2 8.2F 8.2F C9 C10 C11 220k 220pF D1 470F 100F 1F MRA4007T3G R1 3 10 2.2M (N.C.) D2 GND R9 2 1k BAT41ZFILM R2 NTC C5 C4 FS 2.5 A 16 2.2M (N.C.) 100pF 22F OPTO R10 SFH6106 12k RV R3 IC1 VIPER 114LS 2.2M (N.C.) 320V VDD DRAIN R12 130k DIS R11 82k CONTRO L FB AC IN AC IN COM P GND C12 C6 R4 10nF 0 1nF (N.C.) OPTO C7 100pF REF C13 TS432 R13 C8 15k 100pF 220pF R8 SFH6106 C14 22k 2.2nF - + 1