STEVAL-ISA121V1 Wide range single-output demonstration board based on the VIPER37LE Data brief Features ■ Universal input mains range: – input voltage 90 - 264 VAC – frequency 45 - 65 Hz ■ Single-output voltage: 5 V @ 3 A continuous operation ■ Standby mains consumption: < 30 mW @ 230 VAC ■ Average efficiency: > 75% ■ Complies with EuP Lot 6 requirements ■ Fully protected against faults overload, overvoltage, transformer saturation and overheating STEVAL-ISA121V1 ■ Compliant with EMC norm EN55022-Class-B ■ RoHS compilant Description The board implements several protection features that considerably increase end-product safety and reliability: overload protection, overvoltage protection, brownout protection, hysteretic thermal protection, shorted secondary rectifier detection, and transformer saturation protection, 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 Ω RDS(on), 800 V BV(DSS), avalanche-rugged power 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 For further information contact your local STMicroelectronics sales office. 1/6 www.st.com 6 C6 22nF – X2 2/6 3 4 2 1 Doc ID 024066 Rev 1 R11 33k C10 10nF R12 39k CONT BR R13 47k C11 33nF FB C13 2.2nF OPTO KB817A GND DRAIN U1 VIPER37LE R5 3.3 CONTROL VDD R2 3.9M D5 BAT46RL C7 2.2nF OPTO3 KB817A VR1 TS431 R6 330 C3 1200uF R10 100k C9 10nF R8 12k C4 1200uF R14 39k R9 120k GND C5 100uF STEVAL-ISA121V1 electrical diagram D6 18V C12 22uF R4 150k D4 1N4148 D3 STTH1L06 D1 1.5KE220 5V Figure 1. AC IN R7 220 JMP C14 22nF D7 1N4148 C1 220pF. L1 2.2uH Schematic diagram AC IN + NTC 10 R3 2M R1 2.2M C2 33uF D2 STPS30L40CT 1 F1 1.5 A FUSE CM 2X25mH - BR TF Schematic diagram STEVAL-ISA121V1 AM11341v1 STEVAL-ISA121V1 Output characteristics Figure 2. Line and load regulation 5.15 115Vac 230Vac 5.10 Output voltage [V] 5.05 5.00 4.95 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Output current [mA] AM11343v1 Figure 3. No load consumption 65 60 No brownout With brownout 55 50 Input power [mW] 2 Output characteristics 45 40 35 30 25 20 15 10 50 100 150 200 Input voltage [Vac] Doc ID 024066 Rev 1 250 300 AM11345v1 3/6 Output characteristics Figure 4. STEVAL-ISA121V1 Efficiency 79 78 Efficiency [%] 77 76 EPA 2.0 limit 75 115Vac 230Vac average @115Vac average @230Vac 74 73 72 0 2 4 6 8 10 Output power [W] 4/6 Doc ID 024066 Rev 1 12 14 16 AM11344v1 STEVAL-ISA121V1 3 Revision history Revision history Table 1. Document revision history Date Revision 09-Jan-2013 1 Changes Initial release. Doc ID 024066 Rev 1 5/6 STEVAL-ISA121V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. 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