data brief for further information contact your local stmicroelectronics sales office. may 2008 rev 1 1/4 4 STEVAL-ILL014V1 evaluation board for the stcs1 constant current controller for high brightness leds features input voltage (v in ): 4.5 v to 40 v less than 0.5 v voltage overhead up to 1.5 a output current pwm dimming pin shutdown pin led disconnection diagnostic description the best way to power leds is to control the forward current in order to achieve good matching of light output. led manufacturers specify the characteristics (such as lumens, beam pattern, color) of their devices at a specified forward current. the STEVAL-ILL014V1 evaluation board demonstrates the operation of the stcs1 constant current led driver. the stcs1 is capable of controlling the led current under several application conditions, while also providing useful features that make it suitable for different applications such as advertising signs, automotive interior and exterior lighting, and emergency vehicle warning lights. STEVAL-ILL014V1 www.st.com
board schematic STEVAL-ILL014V1 2/4 1 board schematic figure 1. schematic diagram vcc v c c 1 pwm p w m 2 en e n 3 drain d r a i n 4 fb f b 5 gnd g n d 6 slope s l o p e 7 disc d i s c 8 u1 u 1 stcs1a s t c s 1 a c s l ope o p e 2 100nf 1 0 0 n f c s l ope o p e 1 1nf 1 n f rsense r s e n s e 0.33, 1%, 0805 0 . 3 3 , 1 % , 0 8 0 5 0 1 2 j3 j 3 cbypass c b y p a s s 0.1uf,50v 0 . 1 u f , 5 0 v d 4 bat46 b a t 4 6 5v 5 v pwm p w m gnd g n d 1 2 3 j4 j 4 1 2 3 4 j1 j 1 r f 100 1 0 0 pwm p w m 0 0 5v 5 v 1 test point t e s t p o i n t m1 m 1 2n7002 2 n 7 0 0 2 1 2 3 j2 j 2 gnd g n d 5v 5 v r15 r 1 5 10k 1 0 k 0 en e n 0 5v 5 v gnd g n d in pwm i n p w m vcc v c c ntc n t c 10k 1 0 k a r17 r 1 7 1.8k 1 . 8 k k 0 r1 r 1 3 180 1 8 0 5v 5 v d 1 lh r974 l h r 9 7 4 5v 5 v 1 2 j5 j 5 0 vin v i n 1 g nd n d 2 vout v o u t 3 u3 u 3 l7805 l 7 8 0 5 vcc v c c c3 c 3 1uf, 50v 1 u f , 5 0 v this subcircuit is present on evb t h i s s u b c i r c u i t i s p r e s e n t o n e v b only if the led is mounted. o n l y i f t h e l e d i s m o u n t e d . 0 c6 c 6 0.33uf, 50v 0 . 3 3 u f , 5 0 v c7 c 7 100nf, 6.3v 1 0 0 n f , 6 . 3 v 5v 5 v 0 d3 d 3 lumileds lxhl pw09 l u m i l e d s l x h l p w 0 9 vcc v c c
STEVAL-ILL014V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 05-may-2008 1 initial release.
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