H woww.haojlahaok).com DF6113 LED Backlight Driver General Description The DF6113 is @ simple LED controller IC that boosts a 5:24V DC input to produce a precision, current regulated output. The DF6113 is especially suited to LCD backlight applications. bF6113, Linear dimming modes allow stable adjustment of total output current from 10%~100%. ‘The IC includes output short-circuit and over-voltage protection, Features + DC input voltage range 5-24V + Single configurable current-regulated output, + 10%~100% output current adjustment + Positive or inverted analog dimming contro! + Built-in power management and soft-start * Output short-circuit and over-voltage protection a Applications + Portable display device + Desktop LED flat panel display + LED TV, monitor Ordering Information ‘SoraL Part number | Package Operating temp Other DF6113 | SOPs. 20C~ +85C RoHS Absolute Maximum Ratings {Input voltage Vin=20V) Junetion temperature (T)) i50C Power dissipation (Pd) LOW ‘Switching frequency ‘G00KHz Storage temperature SSC ~ +150C Recommended Operating Conditions Input voltage (Vin) 5-24V ‘Switching voltage (ENA) o-5V Dimming voltage (DIM) O-5V Operating frequency 200~500kHz Operating temperature -20C~ +85Cwww.haojlahaok).com. Drs113 Functional Diagram cMP vin (] ve Load Current Comp. Measurement Internal Reference Logic | CONTROL —~ Shutdown Comparator Ext. Current a Control Hi-Freq. Oscillator FB GND Pin Functions (0F6113) PIN | Description LVCC_| BC power input 2 OVvP_| Boost over-voltage detection 3 OMP | Boost soft-start control 4DIM_| <1.0V chip disabled, 1.1V-3.2V dim control 5 FB_| LED ouput current sense 60S _| inductor current sense 7GND | Ground & GATE | Boost MOSFET gate driveH wwrw-haojlahaokd.com Dret13 Electrical Parameters Vin=12.0V, Ta=25°C unless otherwise noted Parameter__| Symbol _| Test Conditions Min typ [max _[ unit General Characteristics Quiescent Torr _[ DIM=0V 10 | 10.0 [wa current eset | DBAESY, 6 7 9 [ma Chip off ° oo |v Chip on 1.0 5.0 DIM input Vout | DIM off (LED current <10%) ° 1.0 DIM on (LED current 10%-100%)| 1.4 32 |v Boost Converter Startup / Vin _] DIM=3v 45 Dropout Vur_| Under-voltage protection limit 40 |v Maximum — | Viwwax | DIM=3V 24 input voltage CMP pultup | lowe | Conp=100nt 10 HA current MOS gate lowe | Peak current at time = 0 500 ma current cS terminal | Veswax | ENA=3V, DIM=3V, Row=20 | 600 mv max voltage CMP at steady state Switch Frea. | fose_| ENA=3V, DIM=3V, Rom=20K | 300 | 350 | 400 | KHz Max/Min Dyuax _| external inductor=47uH 88 20 | 92 |% duty cycle Duan 8 10 12 ovP detect | Vow | extemal output capacitor=22uF| 1.00 | 1.05 | 1.10 |v 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 4.4V ~ 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: four = Imax = 420mV/Rour For example, when using a current sense resistance of Royr = 30, the lamp current is: lour = 420mV / 3Q = 140mAwww.haojlahaok).com. Drs113 Dimming Control Modes Single control signal Row om «22 prnioinn ENA+DIM positive analog dimming (high voltage brightest) ENA bm PinoM) Normal operation when ENA held high or lef floating Chip disabled when ENASGND ENA+DIM inverted analog dimming (low voltage brightest) eae > Pro) 300 ay om «25! 5 > pg) Rea > Leo Rour ENA voltage > 3.0V; output curent 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 extemal 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 4:6. Boost Component Selection The external inductor is typically 47 ~ 100uH, corresponding to a switching frequency of 300KHz. ‘The value of Rygos in Series with the MOSFET determines the maximum output power; the reference designs below specify Ryjos=0.30 and an output power of 10W. Over-voltage Protection When the voltage at the OVP pin (the output voltage after division between R2 and R3) exceeds 1.08V, 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.HH woww.haoglahaok).com. Drs113 Thermal Stability Curve 144 143 142 141 140 139 138 137 136 ' ‘ ' ' ‘ ' ' -20 ° 20 40 60 80 100 120 Temperature (°C) Current (mA) Typical Applications Single control signal omHH www.haojlahaok).com Dr6113 Package Information symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.350 1.750 0.053 0.069 AL 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.064 b 0.330 0.540 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 EL 5.800 6.200 0.228 0.244 e 1.270(BSC) 0.050(BSC) LE 0.400 1.270 0.016 0.050 8 0° 8s 0° 8