STEVAL-ISA121V1 Wide range single-output demonstration board based on the VIPER37LE Data brief Features Universal input mains range: input voltage 90 - 264 V AC frequency 45 - 65 Hz Single-output voltage: 5 V 3 A continuous operation Standby mains consumption: < 30 mW 230 V AC Average efficiency: > 75% STEVAL-ISA121V1 Complies with EuP Lot 6 requirements Fully protected against faults overload, overvoltage, transformer saturation and The board implements several protection features overheating that considerably increase end-product safety Compliant with EMC norm EN55022-Class-B and reliability: overload protection, overvoltage protection, brownout protection, hysteretic RoHS compilant thermal protection, shorted secondary rectifier detection, and transformer saturation protection, Description all of which are in auto-restart mode. The STEVAL-ISA121V1 demonstration board implements a 15 W single-output wide range mains power supply to be used as an auxiliary adapter in applications such as LCD, plasma or LED TVs, desktop computers, etc., when the main power supply is OFF or in standby mode and the auxiliary power supply must provide energy only to some specific parts of the equipment such as USB ports, remote receiver, etc. The board uses the new VIPER37LE, an offline high voltage converter from the VIPerPlus family, specifically designed for fixed frequency flyback converters, which combines a high-performance low voltage PWM controller chip and a max. 4.5 R , 800 V B , avalanche-rugged power DS(on) V(DSS) MOSFET in the same package. The application is optimized for less than 30 mW standby consumption and meets EPA 2.0 limits, thereby helping to meet the most stringent energy-saving requirements. January 2013 Doc ID 024066 Rev 1 1/6 For further information contact your local STMicroelectronics sales office. www.st.com 6Schematic diagram STEVAL-ISA121V1 1 Schematic diagram Figure 1. STEVAL-ISA121V1 electrical diagram + 3 4 2 1 AM11341v1 2/6 Doc ID 024066 Rev 1 D2 STPS30L40CT L1 TF 2.2uH 5V BR D1 C1 1.5KE220 C5 C2 220pF. 100uF 33uF D3 C4 C3 STTH1L06 1200uF 1200uF - R1 2.2M GND C6 22nF X2 R6 R3 D4 D7 330 2M 1N4148 D5 1N4148 BAT46RL CM R2 2X25mH 3.9M R4 150k R5 3.3 OPTO3 R8 KB817A 12k U1 VIPER37LE C12 C14 22nF 22uF R9 VDD DRAIN 120k F1 NTC C9 BR 1.5 A FUSE 10 10nF JMP CONTROL R7 220 CONT R10 100k FB GND C10 10nF AC IN AC IN D6 OPTO 18V KB817A R11 VR1 C11 33k R12 TS431 33nF R14 39k 39k C13 C7 R13 2.2nF 2.2nF 47k