DF6113

DF6113 ETC2

Document overview

• Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 7

Technical content

Features

• DC input voltage range 5-24V + Single configurable current-regulated output voo Ja S)OuTE * 10%~100% output current adjustment ow |? 7VeND * Positive or inverted analog dimming control oye “es * Built-in power management and soft-start om tt “P * Output short-circuit and over-voltage protection SoP-8L

Applications

• — Portable display device * — Desktop LED flat panel display * LCD TV, monitor

Ordering Information

(Input voltage Vin=20V) Recommended Operating Conditions

www.haojlahaokj.com DF6113 Functional Diagram CMP 4.5V —++ VIN [ “A con Load Current Jes P. Measurement Internal Reference ovp . Comp. —+ + |_| OvP = ~“1.0v LOGIC Shutdown . Error, amp. | DIME] Ext. Current Control Hi-Freq. Oscillator FB L ] L_| GND Pin Functions (DF6113) [4 DIM | <1.0V chip disabled, 1.1V-3.2V dim control

8 GATE

www.haojlahaokj.com DF6113 Electrical Parameters Vin=12.0V, Ta=25°C unless otherwise noted symbol | Test Conditions | Min | typ | Max _| unit | General Characteristics current DIM=3V | 6 | 7 | 9 [ma | Chip oft po | | o9 |v [cnipon | to | 80 | DIM input Vom DIM off (LED current <10%) | o | | 10 | DIM on (LED current 10%~100%| 11 | | 3.2 |v Startup / DIM=3¥ [45 [| Dropout Under-voltage protection limit ee ee eee Vv Maximum Vinwax | DIM=3V 24 input voltage CMP pull-up lomp Comp=LOOnf 10 yA current MOS gate Igate Peak current at time = 0 500 mA current CS terminal | Vcsmax | ENA=3V, DIM=3V, Rom=20K mV max voltage CMP at steady state Switch Frea. ENA=3V,DIM=3V, Row=20K | 300 | 350 | 400 | kuz | Max/Min external inductor=47uH | ss | 90 | 92 | duty cycle |e | 10 | 12 | OVP detect Vove external output capacitor = 22uF 1.00 1.05 1.10 | Vv voltage Application Guidelines DIM Control A series resistor is recommended to prevent power supply noise from affecting the DIM input. Chip operation is disabled when DIM < 0.9V Analog brightness control of 10% ~ 100% when DIM 1.1V ~ 3.2V Output current is approximately 100% when DIM > 3.2V Current Adjustment When the DIM pin is held above 3.2V, the boost controller provides 100% current output. 100% current is calculated as follows: lour = Imax = 420MV/Rout For example, when using a current sense resistance of Royr = 3Q, the lamp current is: lour = 420mV / 3Q = 140mA

www.haojlahaokj.com DF6113 Dimming Control Modes Single control signal Rom DIM & Co——~ PIN(DIM) ENA+DIM positive analog dimming (high voltage brightest) ENA DIM PIN(DIM) Normal operation when ENA held high or left floating Chip disabled when ENA=GND ENA+DIM inverted analog dimming (low voltage brightest) ENA eo > PIN(DIM) (>3.0V) Rom Reps > LED- Rout ENA voltage > 3.0V; output current increases as DIM voltage decreases Output Short-Circuit Protection The FB pin used with resistor RFB = 2k prevents high voltage breakdown in the event of a shorted output by disabling switching operation to protect the switching MOSFET. DF6113 Boost Mechanism The external inductor provides energy storage to boost the input voltage; the output capacitor is secondary energy storage to reduce output current ripple. The Schottky diode and MOSFET also greatly affect total system efficiency. Recommended DC/DC step-up ratio is less than 1:5. Boost Component Selection The external inductor is typically 47 ~ 100uH, corresponding to a switching frequency of 300kHz. The value of Ryos in series with the MOSFET determines the maximum output power; the reference designs below specify Rijos=0.3Q and an output power of LOW. Over-voltage Protection When the voltage at the OVP pin (the output voltage after division between R2 and R3) exceeds 1.05V, the converter halts and disables the MOSFET to prevent over-voltage breakdown. The recommended OVP threshold is 10% above the maximum LED design voltage. Supply Isolation To ensure stability under high power operation, a 10 ~ 200 Q resistor in series with the VCC power input pin is recommended to improve supply isolation.

www.haojlahaokj.com DF6113 Thermal Stability Curve 144 143 qe 142 E 141 a 5 140 5 139 o 138 137 136 ' ' ' ' ' f ' -20 Oo 20 40 60 80 100 120 Temperature (°C) Typical Applications Single control signal Li anu ft aoe ios ot we S320 oS Lo al al os 8] il 2604 Rast] Rap BYE Ye yz Vs vz clave nash [] aocos ve ce | yi ye yr yey: = cal avo} . G 6 — lcm cs DIM — lo FB — 6003 feo Rout

www.haojlahaokj.com DF6113 ENA+DIM positive analog dimming ua an FL oom ls pt VIN soe 254 7 $5210 os Lo Fite Bi. NeeD4a4 D808 226 Pars RR0e03 I" Rat] 2a Sov | Sy. as ear ano hae a al cel ca * * weT 2267 _ 108 we a ee oye yy zv| v] casey 08 Rap x Bye Ve yr yz ye i om clang nach [] oso ENA | 3 V3 Vs Vz Vz Vz vec KE bim jor eno fZ » ns Ope ca []Reos — me cof © J 104 coeos Ree d 5 loos fe = R603 Oks iocoa [yee fos12 ENA+DIM inverted analog dimming. Lt anu fa poem ilas bt VIN eos 254 7 ccomswe S210 cs tos Fide en, orn D808 va i IE: 0803 cizos Sys ys ys ye ye cal cl ca ev] 0] ceo Rios SYS 7s Ys Ys ve vB x sys ye ys yz yz cite nen R3L] tocos A. vec GATE | SNP cao} a ot 6 — ve cs 104 eA ns coeo3 4 5. Re c4 lon Ey cS red Fe 80803 ay e603 DIM -——— 0gos [JB osi2

www.haojlahaokj.com DF6113

Package Information

D 2 | Hin a : i GIN i Ne Tou 0 Oo Oo oO OG e UW : piste Dimensions In Millimeters Dimensions In Inches Symbol [Min [Max | Min | Max _—| 1.350 1.750 0.053 0.069 0.100 0.250 0.004 0.010 1.350 1.550 0.053 0.061 0.170 0.250 0.006 0.010 | pd | 4,700 5.100 0,185 0.200 3.800 4.000 0.150 0.157 5.800 6.200 0.228 0.244 [| ee | 1.270(BSC 0,050(BSC 0.400 1.270 0.016 0.050 Loe) | Cl