connectors 12/30/08 preliminary 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 SFDMB3902F is designed to provide backlighting for the sharp lq070y3lg4a. designed, manufactured and supported within the usa, the sfdm features: 9 less than 5 mm in height 9 wide input voltage range 9 constant led current 9 with external pwm dimming signal, up to 1000:1 dimming ratio 9 open and short circuit protection 9 high efficiency 9 separate enable and dimming function 9 soft start 9 one year warranty j1-1 vin(+) j1-2 vin(+) j1-3 gnd j1-4 gnd j1-5 enable j1-6 pwm j1-7 n/c j1-8 fault indicator (output) output connector * molex 53261-1271 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: 7 grams typ. SFDMB3902F 1 output .125 [3,18] dia. (2x) 1.206 [30,63] .350 [8,89] .135 [3,43] input .96 [24,4] 2.19 [55,6] .685 [17,40] 1 j2-1 cathode 1 j2-7 (do not use) j2-2 anode 1 j2-8 (do not use) j2-3 (do not use) j2-9 cathode 3 j2-4 (do not use) j2-10 anode 3 j2-5 cathode 2 j2-11 (do not use) j2-6 anode 2 j2-12 (do not use) * requires harness erg part number h11206xxx recommended
page 2 of 5. (operating characteristics and notes are continued on next page.) SFDMB3902F 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 m w p 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 . 6 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 3 1 . 05 1 . 07 1 . 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 . 2 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 -5 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 9 10 21 2c 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 m w p ) 7 e t o n ( d l o h s e r h t n o - n r u t v n o h t -- 0 . 2c d v d l o h s e r h t f f o - n r u t v f f o h t 9 . 0-- c d v e c n a d e p m i t u p n i m w p ) 8 e t o n ( r m w p -0 . 9- s m h o k y c n e u q e r f ) 0 1 , 9 s e t o n ( f m w p 0 3 1- 0 0 0 , 0 4z h
page 3 of 5. SFDMB3902F 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 25.6v 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 pwm pin is internally pulled up above the turn-on threshold. note 8 pwm pin input impedance is 9k to 4v with a 12v input voltage. note 9 operating outside of this frequency range may cause the driver to shut down or malfunction. note 10 minimum pulse width required for reliable operation is 5s. note 11 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 ) 1 1 e t o n ( v l f n -5 . 2- c d v l e v e l t l u a f ) 1 1 e t o n ( v l f -3 . 0- c d v
page 4 of 5. SFDMB3902F application information the erg SFDMB3902F 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 pwm (j1-6) pins. ? pins 1 and 2 of connector j1 must be connected to +vin, between 8 and 16 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. external pwm dimming ? operation: external pwm configuration as shown in figure 1 allows the user to control display brightness with an externally generated pwm signal. the user is responsible to provide the pwm signal. a dimming ratio up to 1000:1 is possible with this configuration. the minimum pulse width is 5s. ? dimming: dimming is accomplished by applying a pwm signal to the pwm pin (j1-6). pwm on and off levels are specified in the operating characteristics section of the data sheet. display brightness is modulated by controlling the pwm duty cycle as shown in graph 1. pin 6 may be driven by an open collector stage capable of sinking >1ma, or a totem pole stage. ? pins 1 and 2 of connector j1 must be connected to +vin, between 8 and 16 vdc. pins 3 and 4 of connector j1 must be connected to gnd. pin 5 must either be floating or above the full on threshold if being driven by a totem pole stage. ? 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. 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.
page 5 of 5. graph 1 figure 1 enable cathode 1 j2 +12v gnd vin anode 1 1,2 3,4 5 5v 0v duty cycle 0%-100% external pwm dimming j1 6 pwm on off SFDMB3902F fault (output) 8 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. cathode 2 anode 2 cathode 3 anode 3 (1) + (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.
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