downloaded from datasheetlib.com - datasheet search engine connectors 01/04/11 specifications and applications information page 1 of 5. the erg smart force series smart force series smart force series smart force series smart force series of led drivers are specifically designed for applications which require high efficiency, small footprint and lcd brightness stability over a wide input voltage range. the SFDMDB4084F is designed to provide backlight power for the sharp lq104s1dg34 display. designed, manufactured and supported within the usa, the sfdmd features: ? less than 5 mm in height ? wide input voltage range ? constant led current ? with internal dimming signal, up to 255:1 dimming ratio ? open and short circuit protection ? high efficiency ? separate enable and dimming function ? soft start ? one year warranty j1-1 vin(+) j1-2 vin(+) j1-3 gnd j1-4 gnd j1-5 enable j1-6 n/c j1-7 control j1-8 fault indicator (output) output connector molex 52271-0669 smar smar smar smar smar t f t f t f t f t f or or or or or ce led ce led ce led ce led ce led driver driver driver driver driver input connector molex 53261-0871 package configuration pcb components are shown for reference only. actual product may differ from that shown. mass: 9 grams typ. j2-1 anode 1 j2-2 cathode 1 j2-3 anode 2 j2-4 cathode 2 j2-5 anode 3 j2-6 cathode 3 SFDMDB4084F 1 output .125 [3,18] dia. (2x) 1.206 [30,63] .942 [23,92] .135 [3,43] input .96 [24,4] 2.782 [70,66] .685 [17,40] 1
downloaded from datasheetlib.com - datasheet search engine page 2 of 5. (operating characteristics and notes are continued on next page.) s g n i t a r m u m i x a m e t u l o s b a g n i t a rl o b m y se u l a vs t i n u e g n a r e g a t l o v t u p n i v n i 0 . 0 2 + o t 3 . 0 -c d v e r u t a r e p m e t e g a r o t s t g t s 5 8 + o t 0 4 - o c e g a t l o v t u p n i e l b a n e v e l b a n e n i v o t 0c d v e g a t l o v t u p n i l o r t n o c v m w p 0 . 5 + o t 0c d v r o t a c i d n i t l u a f v l f 0 . 4 + o t 0c d v s c i t s i r e t c a r a h c g n i t a r e p o 5 2 = a t d n a c d s t l o v 0 0 . 2 1 = n i v d e t o n e s i w r e h t o s s e l n u o . c c i t s i r e t c a r a h cl o b m y sn i mp y tx a ms t i n u e g a t l o v t u p n i v n i 0 . 8 +0 . 2 1 +0 . 8 1 +c d v e c a f r u s t n e n o p m o c e r u t a r e p m e t ) 1 e t o n ( t s 0 4 --0 8 + o c t n e r r u c t u p n i i n i 4 1 . 07 1 . 00 2 . 0c d a e g a t l o v g n i r t s d e l ) 2 e t o n ( v d e l 0 . 4 2 ) 3 e t o n ( -5 . 8 3c d v y c n e i c i f f e ) 4 e t o n ( h h h h h -2 8-% ) g n i r t s r e p ( t n e r r u c t u p t u oi t u o 7 18 19 1c d a m n i p e l b a n e ) 5 e t o n ( d l o h s e r h t n o - n r u t v n o h t -- 5 . 3c d v d l o h s e r h t f f o - n r u t v f f o h t 8 . 0-- c d v e c n a d e p m i t u p n i e l b a n e ) 6 e t o n ( r e l b a n e -0 . 9- s m h o k n i p l o r t n o c ) 8 , 7 s e t o n ( d l o h s e r h t n o - l l u f v n o h t -0 . 1- c d v d l o h s e r h t h t d i w e s l u p m u m i n i m v n i m w p -5 . 4- c d v t n e r r u c s a i b t u p n i l o r t n o c i s a i b c -- 0 1a u y c n e u q e r f f m w p -5 4 2-z h SFDMDB4084F
downloaded from datasheetlib.com - datasheet search engine page 3 of 5. note 1 surface temperature must not exceed 80 c, except u1, which cannot exceed 95 c. note 2 exceeding maximum string voltage specification will damage the led driver. note 3 the led driver is capable of driving strings less than the minimum string voltage specification, although doing so will limit the maximum input voltage. t o determine max v in: minimum led string voltage (1.3) x (vin maximum) note 4 efficiency is calculated using a 31v led string. note 5 the enable pin is internally pulled up above the turn-on threshold. note 6 enable pin input impedance is 9k to 8v with a 12v input voltage. note 7 control pin is internally pulled up above the turn-on threshold. note 8 control pin input impedance is 485k . note 9 loading with an impedance less than 100k to vcc or to ground may cause the default levels to change. specifications subject to change without notice. s c i t s i r e t c a r a h c g n i t a r e p o ) d e u n i t n o c ( c i t s i r e t c a r a h cl o b m y sn i mp y tx a ms t i n u r o t a c i d n i t l u a f l e v e l t l u a f o n ) 9 e t o n ( v l f n -5 . 2- c d v l e v e l t l u a f ) 9 e t o n ( v l f -3 . 0- c d v SFDMDB4084F
downloaded from datasheetlib.com - datasheet search engine page 4 of 5. application information the erg SFDMDB4084F has been designed to be configured in multiple ways: no dimming ? operation: the sfd can be configured to operate without dimming by floating the enable (j1-5) and control (j1-7) pins. ? pins 1 and 2 of connector j1 must be connected to +vin, between 8 and 18 vdc. pins 3 and 4 of connector j1 must be connected to gnd. ? disabling driver: pulling the enable pin (j1-5) below the minimum turn-off threshold of 0.8v will disable the driver. disabling the driver will require the ability to sink 2ma below the turn-off threshold. this pin may be driven by an open collector stage or a totem pole stage. onboard pwm dimming ? operation: onboard pwm configuration as shown in figure 1 allows the user to control display brightness by controlling the onboard pwm generator. the user is responsible to provide an analog control signal. a dimming ratio up to 255:1 is possible with this configuration. ? dimming: dimming is accomplished by applying an analog voltage to the control pin (j1-7). display brightness is modulated by controlling the control pin voltage as shown in graph 1. ? enable/disable: the driver may be enabled or disabled (turned on and off) by applying a dc voltage to the enable pin(j1-5). enable pin on and off levels are specified in the operating characteristics section of the data sheet. the driver can also be enabled by floating the enable pin. ? pins 1 and 2 of connector j1 must be connected to +vin, between 8 and 18 vdc. pins 3 and 4 of connector j1 must be connected to gnd. f aul t indica t or ? the fault indicator pin (j1-8) may be used as a feedback signal that will fall below the fault level of 0.3v in the case of an open string, a shorted string, an output overvoltage condition, or an over temperature condition. if used, this pin should be loaded with a high impedance stage as specified in the operating characteristics. do not drive this pin with a voltage, as it will damage the driver. SFDMDB4084F
downloaded from datasheetlib.com - datasheet search engine page 5 of 5. u l ? r e g i s t e r e d f i r m r e g i s t e r e d f i r m e n d i c o t t r e s e a r c h g r o u p , i n c . i s o 9 0 0 1 a 3 3 1 3 endicott research group, inc. (erg) reserves the right to make changes in circuit design and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by erg is believed to be accurate and reliable. however, no responsibility is assumed by erg for its use. (1) low esr type input by-pass capacitor (10 uf - 220 uf) may be required to reduce reflected ripple and to improve power supply response. SFDMDB4084F graph 1 onboard pwm dimming figure 1 vin gnd control enable cathode 1 j2 +12v gnd vin anode 1 analog dimming voltage (0 to 5v) j1 1,2 3,4 1,2 7 5 cathode 2 anode 2 cathode 3 anode 3 +on -off optional potentiometer fault (output) 8 3,4 + (1)
|
