data brief for further information contact your local stmicroelectronics sales office. february 2009 rev 1 1/4 4 STEVAL-ISA060V1 6 w single output smps demonstration board based on the viper17 features input voltage range vin: 90 vrms to 265 vrms output voltage v out : 12 v max output current iout: 500 ma precision of output regulation ? v out_lf : 5% high frequency output voltage ripple ? v out_lf : 50 mv description this demonstration board is based on the new viper17 device and implements a standard single-output isolated flyback converter operating at fixed frequency that can be 115 khz or 60 khz. the viper17 device integrates in the same package two components: an advanced pwm controller with built-in bc d6 technology and an 800 v avalanche rugged vertical power mosfet. it is very suitable for offline power conversion operating either with wide range input voltage (85 vac - 270 vac) up to 6 w or with single range input voltage (85 vac - 132 vac or 175 vac - 265 vac). with european range input voltage (175 vac - 265 vac) the device can handle up to 10 w of output power. the proposed solution has the advantage of using few external components compared to a discrete solution, providing several protections and very low standby consumption in no-load condition. the protections present on the device such as overload and output overvoltage protections, secondary winding short-circuit protection, hard transformer saturation and brownout protections improve the reliability a nd safety of the design. the frequency jittering, that is inside implemented, helps to meet the standards regarding electromagnetic disturbance. moreover internal thermal shutdown and an 800 v avalanche rugged power mosfet improve the robustness of all the system. if brownout and overvoltage protection are not necessary, the number of external components is further reduced. STEVAL-ISA060V1 www.st.com
circuit schematic STEVAL-ISA060V1 2/4 1 circuit schematic figure 1. schematic 12v 500m 1 2 v 5 0 0 m a r 3 r 3 6 8 k 6 8 k r 3 r 3 6 8 k 6 8 k c1 c 1 x2 x 2 c1 c 1 x2 x 2 1 2 j1 j 1 con2 c o n 2 j1 j 1 con2 c o n 2 1 2 j2 j 2 con2 c o n 2 j2 j 2 con2 c o n 2 r1 r 1 10 1 0 r1 r 1 10 1 0 r1 r 1 3 1k 1 k r1 r 1 3 1k 1 k c 3 c 3 10 u f 450 1 0 u f 4 5 0 v c 3 c 3 10 u f 450 1 0 u f 4 5 0 v l1 l 1 4.7 u 4 . 7 u h l1 l 1 4.7 u 4 . 7 u h 1 2 4 3 op o p to t o 1 pc 8 1 p c 8 1 7 op o p to t o 1 pc 8 1 p c 8 1 7 4 2 8 1 3 5 7 brown ou b r o w n o u t cont c o n t dra d r a in i n s ource s o u r c e cont c o n t ro r o l vd v d d fb f b u1 u 1 viper17h v i p e r 1 7 h n brown ou b r o w n o u t cont c o n t dra d r a in i n s ource s o u r c e cont c o n t ro r o l vd v d d fb f b u1 u 1 viper17h v i p e r 1 7 h n c4 c 4 22 u f 25v 2 2 u f 2 5 v c4 c 4 22 u f 25v 2 2 u f 2 5 v c1 c 1 1 15n 1 5 n f c1 c 1 1 15n 1 5 n f c5 c 5 n. n . m c5 c 5 n. n . m d1 d 1 bat46 b a t 4 6 d1 d 1 bat46 b a t 4 6 d 3 d 3 s tth1l06 s t t h 1 l 0 6 d 3 d 3 s tth1l06 s t t h 1 l 0 6 c 8 c 8 y 1 1. 8 n 1 1 . 8 n f c 8 c 8 y 1 1. 8 n 1 1 . 8 n f f1 f 1 500ma fu s e 5 0 0 m a f u s e f1 f 1 500ma fu s e 5 0 0 m a f u s e d5 d 5 p6ke250 p 6 k e 2 5 0 d5 d 5 p6ke250 p 6 k e 2 5 0 1 3 2 j 3 j 3 jumper j u m p e r j 3 j 3 jumper j u m p e r d2 d 2 1n414 8 1 n 4 1 4 8 d2 d 2 1n414 8 1 n 4 1 4 8 r1 r 1 0 33 0k 3 3 0 k r1 r 1 0 33 0k 3 3 0 k r1 r 1 2 33 k 3 3 k r1 r 1 2 33 k 3 3 k c6 c 6 1. 8 n 1 . 8 n f c6 c 6 1. 8 n 1 . 8 n f r9 r 9 1 8 k 1 % 1 8 k 1 % r9 r 9 1 8 k 1 % 1 8 k 1 % 1 2 t nt n t c1 c 1 10 ohm ntc 1 0 o h m n t c t nt n t c1 c 1 10 ohm ntc 1 0 o h m n t c r1 r 1 4 220k 2 2 0 k r1 r 1 4 220k 2 2 0 k r 8 r 8 6 8 k 1 % 6 8 k 1 % r 8 r 8 6 8 k 1 % 6 8 k 1 % r4 r 4 1600k 1 6 0 0 k r4 r 4 1600k 1 6 0 0 k 4 1 3 2 br b r 1 br b r 1 c9 c 9 zl 470 u f 25 z l 4 7 0 u f 2 5 v c9 c 9 zl 470 u f 25 z l 4 7 0 u f 2 5 v c7 c 7 33 nf 3 3 n f c7 c 7 33 nf 3 3 n f 5 4 6 9 1 2 8 7 t1 t 1 tr t r an s f a n s f or o r me m e r t1 t 1 tr t r an s f a n s f or o r me m e r r6 r 6 1k 1 k r6 r 6 1k 1 k 2 1 3 vr v r 1 tl4 3 1 t l 4 3 1 vr v r 1 tl4 3 1 t l 4 3 1 r2 r 2 1600k 1 6 0 0 k r2 r 2 1600k 1 6 0 0 k d4 d 4 s tp s 2h100 s t p s 2 h 1 0 0 d4 d 4 s tp s 2h100 s t p s 2 h 1 0 0 4 1 3 2 t2 t 2 t2 t 2 c1 c 1 0 yk y k 47 u f 25 4 7 u f 2 5 v c1 c 1 0 yk y k 47 u f 25 4 7 u f 2 5 v c1 c 1 2 10nf 1 0 n f c1 c 1 2 10nf 1 0 n f r5 r 5 22k 2 2 k r5 r 5 22k 2 2 k c2 c 2 10 u f 450v 1 0 u f 4 5 0 v c2 c 2 10 u f 450v 1 0 u f 4 5 0 v
STEVAL-ISA060V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 09-feb-2009 1 initial release.
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