STEVAL-ISA035V1

STEVAL-ISA035V1 Non-isolated offline power supply demonstration board based on the VIPER22A-E Data brief Features Input voltage range: 85 Vac to 264 Vac Input voltage frequency: 50/60 Hz Lowest possible component count Integrated thermal overload protection No-load consumption: around 200 mW 70% to 80% efficiency at full load Integrated short-circuit protection STEVAL-ISA035V1 Description Many appliances today use non-isolated power supplies to furnish the low output power required to run a microcontroller, LED displays, and relays or AC switches. This type of power supply has a single rectifier to reference the neutral to output ground in order to fire Triacs or AC switches. This demonstration board can use the VIPER12A-E or the VIPER22A-E, which are pin- for-pin compatible and can supply power for a wide variety of applications. The VIPER12A-E is used for 12 V at 200 mA and 16 V at 200 mA, while the VIPER22A-E is used for 12 V at 350 mA and 16 V at 350 mA. The same board can be used for any output voltage from 10 V to 35 V. For more design details, please refer to application note AN1357. January 2010 Doc ID 15041 Rev 2 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 . 7 )E Schematic diagrams STEVAL-ISA035V1 1 Schematic diagrams Figure 1. Circuit schematic for 12 V at 350 mA 7 6 0 ,& 9 7 6 0 ,& 9, ( ,3 HU 3 X) X 9 9 . X) G9G 9 9 UDL UDL Q UDL Q UDL Q Q 6 0 , 2 7& 9 9 P + X - - 9 O 1HXWUD X) 9 Q SL X) X) Q SL N UMPE OPE R * O 6 & & U 6 % 0 N O * Figure 2. Circuit schematic for 16 V at 350 mA : 6 3 -) 4 . 5 6 U 6 6) 0 ER )0 % +6 &B D6D X RAIN RAIN AIN R RAIN 2 3 -) 4 , 7 , U( M( * * ,IN E : PIN + 6 U& AL .E UTR 344 ( 2 6 U& U& 34 P I 6 6 UM * P ER 3 H OR CIRCUI T T 6 O R & MA CHANG E U & 6 5 6 )0 ER )0 % - 6 2/4 Doc ID 15041 Rev 2 3O URCE XUFH 6R 3O URCE XUFH 6R 2 M 6 4/ U& R UMPEPE 5 6) ER )0 R M CHA NG E 9 9 677 + 5 & & & . 5 = /L QH P+ / : / &7 5 & 8 & & & =