data brief for further information contact your local stmicroelectronics sales office. september 2008 rev 1 1/4 4 STEVAL-ILL017V1 offline constant current led driver based on the viper17 features input voltage 220 vac +/- 20% 800 v avalanche rugged power section provides 500 ma constant current for led high precision constant current with +/- 5% tolerance (1 sense resistor and 2 resistor bridges with +/- 1% precision) overtemperature protection led open-circuit protection led short-circuit protection pwm operation with frequency jittering for low emi operating frequency: ? 60 khz for l type ? 115 khz for h type standby power < 50 mw at 265 vac adjustable and accurate overvoltage protection on-board soft-start safe auto-restart after a fault condition applications adapters for pdas, camcorders, electric shavers, cellular phones, videogames auxiliary power supply for lcd/pdp tvs, monitors, audio systems, computers, industrial applications smps for set-top boxes, dvd players/ recorders, white goods description the STEVAL-ILL017V1 demonstration board is a 2 w non-isolated offline constant current led driver based on the viper17. the board operates with an input ranging from 176 v to 264 vac and provides 500 ma of constant current from a 7 vdc source, suitable for illuminating two leds in series. the viper17 device is an offline converter with an 800 v rugged power section, a pwm control, overcurrent protection, overvoltage and overload protection, hysteretic thermal protection, soft-start and safe auto-restart after the removal of a fault condition. the brown-out protection function is embedded into the high voltage start-up. burst mode operation and the very low consumption of the device combine to meet standby energy saving regulations. advanced frequency jittering reduces emi filter cost. STEVAL-ILL017V1 www.st.com
circuit schematic STEVAL-ILL017V1 2/4 1 circuit schematic figure 1. schematic diagram f u s e1 e 1 f us e u s e 250v 2 5 0 v c 3 2.2 u 2 . 2 u f 8 7 3 1 6 5 t 1 t r a n s for n s f o r m e r d 6 s t s t p s 2h100 s 2 h 1 0 0 a c 9 220 u 2 2 0 u f r 9 1.2 1 . 2 d 5 s tth1r06 s t t h 1 r 0 6 a c 5 10 u 1 0 u f gn g n d gn g n d gn g n d r 1 240 2 4 0 k c 1 1n 1 n f r 3 100 1 0 0 k r 7 8 2 8 2 k c 7 12n 1 2 n f r 8 3 k 5 6 7 1 2 3 8 4 vcc v c c + o u t1 o u t 1 i n v 1 nonin n o n i n v 1 v cc c c - nonin n o n i n v 2 i n v 2 o u t2 o u t 2 u 2 t s m103w t s m 1 0 3 w c 4 56n 5 6 n f r 6 10 1 0 c 8 100n 1 0 0 n f r1 r 1 1 24 2 4 k r1 r 1 0 3.3 3 . 3 k c1 c 1 0 470p 4 7 0 p f r 5 10 1 0 k c 2 100n 1 0 0 n f 1 2 p 1 ac a c i n 1 2 p 2 l ed e d o u o u t 1 2 d 3 bat4 b a t 4 6 c1 c 1 2 10 u 1 0 u f r 2 6. 8 6 . 8 k c1 c 1 3 1 u 1 u f r1 r 1 2 1.2 1 . 2 r1 r 1 3 2.7 2 . 7 k 6 1 8 3 4 5 7 2 b r dr a i d r a i n dr a i d r a i n s o u rc s o u r c e con c o n t vd v d d f b u 1 v i p er1 e r 1 7 c 6 2.2n 2 . 2 n f r 4 56 5 6 k r1 r 1 4 1 m q 1 bc 8 17 b c 8 1 7 - 40 4 0 4 1 3 2 d 1 b r i dg d g e c1 c 1 1 2.2 u 2 . 2 u f l 2 1 m h v l i n e vne v n e u v l _ f us u s e v p o s v p d r a in r a i n
STEVAL-ILL017V1 revision history 3 /4 2 revision history table 1. document revision history date revision changes 01-sep-2008 1 initial release.
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