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 Description STEVAL-ISA035V1 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 pinfor-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 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic diagrams 1 STEVAL-ISA035V1 Schematic diagrams Figure 1. Circuit schematic for 12 V at 350 mA ' 60',&7 '= 9 9,3HU$',3( 6RXUFH  6RXUFH )E ' 60',&7 & X) 9 &[  9 & X) 9 /   8 / X+ - /LQH   1HXWUDO   'UDLQ  'UDLQ 9GG  'UDLQ 'UDLQ 5  :  & X .9 729$& ' 60',&7 5 . ' 677+5$ & X) 9 & X) 9 SLQ 9 # P$ P+ & X) 9 - '= 9   SLQ *UMPEROPEN  &OR6 M!CHANGE #U& 6 56)0ER!$)0 % *UMPEROPEN ".7 Figure 2. Circuit schematic for 16 V at 350 mA  3OURCE 3OURCE &B $ 3-$)#4 # U& 6 #X  ,   $ 3-$)#4 6)0ER !$)0 %  2  7 5     # U +6 4/6!# $RAIN $RAIN 6DD $RAIN $RAIN $: 6 . , * PIN 6 M( U( * ,INE   2 + .EUTRAL # U& 6 # U& 6 $ 344(2! 34 M! # U& 6 $: 6   P I  *UMPER3HORTCIRCUIT &OR6 MACHANGE #U& 6 56)0ER!$)0 % 2/4 !-6 Doc ID 15041 Rev 2 STEVAL-ISA035V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 15-Sep-2008 1 Initial release. 18-Jan-2010 2 Updated Figure 1: Circuit schematic for 12 V at 350 mA. Minor text and formatting changes. Doc ID 15041 Rev 2 3/4 STEVAL-ISA035V1 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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