for further information contact your local stmicroelectronics sales office. april 2013 docid024565 rev 1 1/4 4 STEVAL-ISA134V1 12 v - 4 w, 115 khz isolated flyback based on the viper06 data brief features ? ac main input voltage v in : 85 v ac - 265 v ac ? main frequency f l : 50 hz; 60 hz ? output voltage v out : 12 v ? max output current i out : 333 ma ? precision of output regulation v out_lf : 5% ? high frequency output voltage ripple: v out_hf 50 mv ? min active mode efficiency av = 71% ? max ambient operating temperature: t amb = 60 c description the STEVAL-ISA134V1 demonstration board is a a 12 v - 4 w power supply in isolated flyback topology using the viper06, a new off-line high voltage converter by stmicroelectronics. the viper06 features an 800 v avalanche rugged power section, pwm operation at 115 khz with frequency jittering for lo wer emi, cycle-by-cycle current limit with adjustable set point, on-board soft-start and safe auto -restart after a fault condition. protection features ava ilable include thermal shutdown with hysteresis, delayed overload protection, and open loop failure protection (the latter available only if auxiliary winding is used). this flyback converter design is suitable for various applications, such as external adapter or as an auxiliary power supply in consumer equipment. www.st.com
schematic diagram STEVAL-ISA134V1 2/4 docid024565 rev 1 1 schematic diagram figure 1. STEVAL-ISA134V1 circuit schematic $ & , 1 $ & , 1 9 r x w 9 r x w & & ) ) s s 5 5 n n 5 5 n n ' ' % % 7 7 $ $ ) ) = = , , / / & & < < ) ) q q & & ) q q ) 5 5 % % 5 5 % % 0 0 6 6 & & ) x x ) 9 9 5 5 & & , , + ) ) 6 6 + 7 7 5 5 n n / / + p p + ' ' $ $ / / + + 7 7 7 7 6 6 7 7 ' ' 9 9 5 5 0 0 & & 1 1 & & 5 5 9 9 ) ) x x & & , , 6 6 7 7 5 5 n n / / + + x x & & ) ) x x 9 9 & & ) ) q q & & 9 9 ) ) x x & & ) ) q q 5 5 0 0 & & 9 9 ) ) x x ' ' 5 5 6 6 7 7 3 3 6 + + 6 $ $ & & ) q q ) % % ) ) 3 3 0 0 2 2 & & * * ' ' 1 1 ' ' 5 5 $ $ , , 1 1 ' ' ' ' 9 9 1 1 2 2 & & 7 7 / / 2 2 5 5 , , / / 0 0 & & , , 9 9 ( ( 3 3 , , 5 5 + + / / + + x x 5 5 n n
docid024565 rev 1 3/4 STEVAL-ISA134V1 revision history 2 revision history table 1. document revision history date revision changes 16-apr-2013 1 initial release.
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