Specificatins and Applicatins Infrmatin 1/1/8 Prelimary Smart Fr rce LED Driver The ERG Smart Frce Series f LED Drivers are specifically designed fr applicatins which require high efficiency, small ftprt and LCD brightness stability ver a wide put vltage range. The SFDMB3638F is designed t prvide backlightg fr the NEC NL1276BC13-1C. Package Cnfiguratin Designed, manufactured and supprted with the USA, the SFDM features: Less than mm height Wide put vltage range Cnstant LED current With external dimmg signal, up t 1:1 dimmg rati Open and shrt circuit prtectin High efficiency Separate enable and dimmg functin Sft start One year warranty Cnnectr Mlex 3261-871 J1-1 (+) J1-2 (+) J1-3 GND J1-4 GND J1- J1-6 J1-7 N/C J1-8 Fault Indicatr (utput) Cnnectrs Output Cnnectr * Mlex 3261-1271 J2-1 Cathde 1 J2-7 Cathde 4 J2-2 Ande 1 J2-8 Ande 4 J2-3 Cathde 2 J2-9 Cathde J2-4 Ande 2 J2-1 Ande J2- Cathde 3 J2-11 Cathde 6 J2-6 Ande 3 J2-12 Ande 6 * Requires harness ERG part number H1312XXX recmmended 2.19 [,6] 1.68 [17,4] Mass: 7 grams typ. 1 Output.12 [3,18] Dia. (2x) 1.26 [3,63].3 [8,89].13 [3,43].96 [24,4] PCB cmpnents are shwn fr reference nly. Actual prduct may differ frm that shwn. page 1 f.
Abslute Maximum Ratgs Ratg alue Strage ltage Range Temperature -.3 t +2. T -4 t +8 C stg ltage ltage t t +. Fault Indicatr Operatg Characteristics t +4. FL Unless therwise nted = 12. lts dc and Ta = 2 C. Characteristic M Typ Max ltage + 8. + 12. + 2. Cmpnent Surface ( Nte 1) T -4 - + 8 C Temperature s Current I.22.26.3 Adc LED Strg ltage ( Nte 2) ED L 26 ( Nte 3) - 38 Efficiency ( Nte 4) h - 9 - % Output Current (per strg) I ut 1 16 17 madc P (Nte ) Turn-n Threshld thn - - 3. Turn-ff Threshld thff. 8 - - Impedance (Nte 6) R - 9. - kohms P (Nte 7) Turn-n Threshld thn - - 2. Turn-ff Threshld thff. 9 - - Impedance (Nte 8) R - 9. - kohms Frequency (Ntes 9, 1) F (Operatg Characteristics and ntes are cntued n next page.) 13-4, Hz page 2 f.
O peratg Characteristics (cntued ) Characteristic M Typ Max Fault Indicatr N Fault Level (Nte 11) - 2. - NFL (Nte 11) Fault Level FL -. 3 - Specificatins subject t change withut ntice. Nte 1 Nte 2 Nte 3 Surface temperature must nt exceed 8 C, except U1, which cannt exceed 9 C. Exceedg maximum strg vltage specificatin will damage the LED driver. The LED driver is capable f drivg strgs less than the mimum strg vltage specificatin, althugh dg s will limit the maximum put vltage. T determe max : mimum LED strg vltage (1.3) x ( maximum) Nte 4 Nte Nte 6 Nte 7 Nte 8 Nte 9 Nte 1 Nte 11 Efficiency is calculated usg a 29 LED strg. The p is ternally pulled up abve the turn-n threshld. p put impedance is 9kΩ t 8 with a 12 put vltage. p is ternally pulled up abve the turn-n threshld. p put impedance is 9kΩ t 4 with a 12 put vltage. Operatg utside f this frequency range may cause the driver t shut dwn r malfunctin. Mimum pulse width required fr reliable peratin is µs. Ladg with an impedance less than 1kΩ t cc r t grund may cause the default levels t change. page 3 f.
Applicatin Infrmatin The ERG SFDMB3638F has been designed t be cnfigured multiple ways: NO DIMMING OPERATION: The SFD can be cnfigured t perate withut dimmg by flatg the (J1-) and (J1-6) ps. Ps 1 and 2 f cnnectr J1 must be cnnected t +, between 8 and 2. Ps 3 and 4 f cnnectr J1 must be cnnected t GND. DISABLING DRIER: Pullg the p (J1-) belw the mimum turn-ff threshld f.8 will disable the driver. Disablg the driver will require the ability t sk 2mA belw the turn-ff threshld. This p may be driven by an pen cllectr stage r a ttem ple stage. EXTERNAL DIMMING OPERATION: External cnfiguratin as shwn Figure 1 allws the user t cntrl display brightness with an externally generated signal. The user is respnsible t prvide the signal. A dimmg rati up t 1:1 is pssible with this cnfiguratin. The mimum pulse width is µs. DIMMING: Dimmg is accmplished by applyg a signal t the p (J1-6). n and ff levels are specified the Operatg Characteristics sectin f the data sheet. Display brightness is mdulated by cntrllg the duty cycle as shwn Graph 1. P 6 may be driven by an pen cllectr stage capable f skg >1mA, r a ttem ple stage. Ps 1 and 2 f cnnectr J1 must be cnnected t +, between 8 and 2. Ps 3 and 4 f cnnectr J1 must be cnnected t GND. P must either be flatg r abve the full n threshld if beg driven by a ttem ple stage. DISABLING DRIER: Pullg the p (J1-) belw the mimum turn-ff threshld f.8 will disable the driver. Disablg the driver will require the ability t sk 2mA belw the turn-ff threshld. This p may be driven by an pen cllectr stage r a ttem ple stage. FAULT INDICATOR The Fault Indicatr p (J1-8) may be used as a feedback signal that will fall belw the fault level f.3 the case f an pen strg, a shrted strg, an utput vervltage cnditin, r an ver temperature cnditin. If used, this p shuld be laded with a high impedance stage as specified the Operatg Characteristics. D nt drive this p with a vltage, as it will damage the driver. page 4 f.
EXTERNAL DIMMING SFDMB3638F Graph 1 J1 J2 +12 + (1) 1,2 Ande 1 Cathde 1 3,4 GND Ande 2 Cathde 2 ON Duty Cycle %-1% OFF 6 Ande 3 Cathde 3 Ande 4 Cathde 4 Ande Cathde (utput) 8 Fault Ande 6 Cathde 6 Figure 1 (1) Lw ESR type put by-pass capacitr (1 uf - 22 uf) may be required t reduce reflected ripple and t imprve pwer supply respnse. REG UL Endictt Research Grup, ISO 91 IRM ISTERED F A3313 Inc. Endictt Research Grup, Inc. (ERG) reserves the right t make changes circuit design and/r specificatins at any time withut ntice. Accrdgly, the reader is cautined t verify that data sheets are current befre placg rders. Infrmatin furnished by ERG is believed t be accurate and reliable. Hwever, n respnsibility is assumed by ERG fr its use. page f.