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AN24 Datasheet(PDF) 3 Page - Copal Electronics |
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AN24 Datasheet(HTML) 3 Page - Copal Electronics |
3 / 9 page AN24 3 Document No. 6041, Rev. B W-6237 EVALUATION The W-6237EVAL2 gives the user a way to evaluate the W-6237 in a typical application of driving multiple LEDs. The user can connect 6 to 8 LEDs in series to the W-6237 output, using the jumper options for J2, J3 or J4 header- pin connectors. The following steps are an example of how the user can evaluate the W-6237 white LED driver: 1) Driving 8 LEDs in series and Shutdown Mode a) Connect the 8-LEDs string to the W-6237 output using a jumper shunt on J4 header-pin connector (J2 , J3 not jumpered). b) Set the R2 potentiometer to the middle position. c) Apply the external voltage supply, Vext (3.0V < VIN < 5V) between VIN (T1) and GND (T2). d) The W-6237 is in the shutdown mode (SHDN pin is connected to GND) if the J1 connector is not jumpered. - Connect a current meter between Vext and VIN pad to measure the shutdown current: ISD << 1 A - In this mode of operation the LEDs are disconnected from the output: LEDs are OFF e) Connect SHDN pin of the W-6237 to VIN using a jumper shunt between Pin #1 and Pin #2 of J1 connector - Observe that LEDs are ON. e m a Nr e r u t c a f u n an Mo i t p i r c s er De b m u N t r as Pt i n U 1 Un COPAL i p - 5 - 3 2 T O S T , r e v i r D D E L e t i h W S O MI CS T 7 3 21 W-6 1 C n e d u Y o y i a T ) c i n o s a n a P r o ( , R 5 X , V 3 . 6 / F u 7 . 4 r o t i c a p a C c i m a r e C 5 0 8 0 e z i S 5 7 4 J B 2 1 2 K M J ) D N - T C 5 1 3 2 C C P y e K - i g i D r o ( 1 2 C n e d u Y o y i a T ) t e m e K r o ( , V 0 5 / F u 2 2 . 0 r o t i c a p a C c i m a r e C ) R 7 X ( R 5 X ) U T C A R 5 K 4 2 2 C 6 0 2 1 C1 ( 1 La d i m u S , R C D w o l , H u 3 3 r o t c u d n I t n e r r u c h g i h 0 3 3 - 6 1 D 3 H R D1 C 1 Dx e t e Z , t n e r r u c h g i h , F V w o L , e d o i D y k t t o h c S 3 2 3 - D O S D N - T C 0 0 4 S C H1 Z 1 Ro e g a3 Y0 6 0 , m h o 1 8 . 6 , W 6 1 / 1 r o t s i s e R T MD SN - T C H 1 8 . 6 - 1 1 3 y e K - i g i1 D 2 R COPAL Sermet Trimmer, 100 ohm CT-6EP 100 1 3 Ro e g a3 Y0 6 0 , m h o K 0 . 1 , W 6 1 / 1 r o t s i s e R T MD SN - T C H K 0 . 1 - 1 1 3 y e K - i g i1 D 4 Ro e g a3 Y0 6 0 , m h o K 0 0 2 , W 6 1 / 1 r o t s i s e R T MD SN - T C H K 0 0 2 - 1 1 3 y e K - i g i1 D 5 Ro e g a Y m h o K 0 1 , W 6 1 / 1 r o t s i s e R m li F l a t e M ) d r a o b n o d e r e d l o s t o n ( D N - K B X K 0 . 0 1 y e K - i g i1 D 8 L o t 1 La i h c iT NM S , D E L e t i h5 W3 3 W C S N r o 0 0 1 W C S8 N 1p Ji r t S e l g n i S , " 1 . 0 , r o t c e n n o C r e d a e H n i p - 6 D N - 6 0 - 2 1 0 1 S y e K _ i g i D ) v i u q e r o ( 1 4 J o t 2p Ji r t S e l g n i S , " 1 . 0 , r o t c e n n o C r e d a e H n i p - 2 D N - 2 0 - 2 1 0 1 S y e K _ i g i D ) v i u q e r o ( 3 o t 1 T 0 1 T x a M - li) Ms t n i o P t s e T ( e l c a t p e c e R n i P 0 - 4 0 - 4 1 - 0 3 - 1 0 - 5 1 - 0 - 9 4 1 0 # ) v i u q e r o ( 0 1 Table 1. W-6237EVAL2 Board List of Components |
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