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| DIT8545 Ceratrans Driver for LCD Backlight DESCRIPTIONS DIT8545 is an advanced LCD backlight inverter control IC based on the piezo-ceramic transformer. The new control scheme employing the variable fr equency and duty control achieves the very high efficiency over 90%. In this control scheme, the soft start and zero voltage switching functions are aut omatically obtained. DIT8545 can realize the CCFL backlight inverter with small size and low cost. FEATURES - Soft start function - Programmable Operating Frequency - Analog Dimming Control Function - Burst Dimming Control - ON/OFF Control Function - Open Lamp Protection - 10SSOP Package ORDER INFORMATION Device DIT8545 Package 10SSOP-225 Operating Temp -25 OC ~ +85 OC BLOCK DIAGRAM CT VCC UVLO 1 RT CT RT 10 OUT 2 EI VFVCO Driver 9 GND TONCT L 3 Error Amp 8 Bandgap Reference Bias Generator Latch EO ON/OFF 4 TONCTL 7 PROT 5 6 Aug. 2002 WWW.INTERPIONSEMI.COM -1- DIT8545 Ceratrans Driver for LCD Backlight PIN CONNECTIONS VCC 10 OUT 9 GND 8 ON/OFF 7 PROT 6 DIT8545 1 CT 2 RT 3 EI 4 EO 5 TONCTL PIN DESCRIPTIONS NO 1 2 3 4 5 6 7 8 9 10 SYMBOL CT RT EI EO TONCTL PROT ON/OFF GND OUT VCC I/O I I I O I I I O DESCRIPTION TIMING CAPACITOR CONNECTION TIMING RESISTOR CONNECTION ERROR AMPLIFIER INPUT ERROR AMPLIFIER OUTPUT SWITCH ON TIME CONTROL INPUT OPEN LAMP PROTECTION INPUT ON/OFF CONTROL INPUT GROUND OUTPUT SUPPLY VOLTAGE INPUT Aug. 2002 WWW.INTERPIONSEMI.COM -2- DIT8545 Ceratrans Driver for LCD Backlight ABSOLUTE MAXIMUM RATINGS CHARACTERISTICS Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL Vcc Pd Topr Tstg VALUE 13.5 0.3 -25 ~ +85 -55 ~ 150 UNIT V W O C C O RECOMMENDED OPERATING CONDITIONS CHARACTERISTICS Supply Voltage Oscillator Frequency SYMBOL Vcc fosc VALUE 3~13.5 40~250 UNIT V kHz ELECTRICAL CHARACTERISTICS (Ta = 25O C, VCC=5V, RT=13.8K CT=1.5V, PROT=0V unless otherwise specified.) CHARACTERISTICS SYMBOL CONDITIONS MIN TYP MAX UNIT [ Operating Current Specifications] On State Supply Current Off State Supply Current Average Operating Current On State Start-up Current Off State Start-up Current [ Voltage Controlled Oscillator ] RT Voltage RT Terminal Maximum Current RT Voltage Line Regulation RT Voltage Load Regulation Aug. 2002 Vref IRTmax Vline Vload RT=0V VCC=5V ->12V Io=100uA~1mA 1.235 -20 -20 1.260 7 2 2 1.285 16 20 20 V mA mV mV -3Icc(on) Icc(off) Iop Ist(on) Ist(off) ON/OFF=2V ON/OFF=0V CT=470pF VCC=VthH - 0.3V ON/OFF=2V VCC=VthH - 0.3V ON/OFF=0V 3.5 350 4 250 200 6 600 7 400 400 mA uA mA uA uA WWW.INTERPIONSEMI.COM DIT8545 Ceratrans Driver for LCD Backlight ELECTRICAL CHARACTERISTICS (Ta = 25O C, VCC=5V, RT=13.8K CT=1.5V, PROT=0V unless otherwise specified.) CHARACTERISTICS Operating Frequency Frequency Change With Supply Voltage Minimum Duty Ratio Maximum Duty Ratio TONCTL Input Bias Current [ UVLO Section ] Upper Threshold Voltage Lower Threshold Voltage UVLO Hysteresis Voltage [ ON/OFF Section ] ON/OFF Logic High Voltage ON/OFF Input Bias Current [ Error Amplifier Section] Erramp Input Bias Current Inverting Reference Voltage Erramp Output Source Current Erramp Output Sink Current Erramp Output High Voltage Erramp Output Low Voltage SYMBOL Fosc Dfosc Dmin Dmax Ib(TON) CONDITIONS CT=470pF VCC=5V to 12V TONCTL = 0V TONCTL = 3V TONCTL = 0V MIN 120 10 55 - TYP 135 0.3 20 65 -0.1 MAX 150 1.5 30 75 -1 UNIT kHz %/V % % uA VthH VthL Vhys VCC Variation VCC Variation VCC Variation 2.6 2.4 0.1 2.8 2.6 0.2 2.95 2.8 0.4 V V V Von/off Ib(on/off) ON/OFF=2V 1 5 1.3 20 1.8 50 V uA Ib(EI) Vfb Isource Isink Vhigh Vlow 1.220 3 5 3.2 - -0.1 1.260 10 15 4.2 0.1 -1 1.300 30 40 4.5 0.4 uA V mA mA V V [ Open Lamp Protection Section ] Protection Input Bias Current Protection Input Voltage Iprot Vprot PROT=1.5V 1 1 1.35 40 1.60 uA V Aug. 2002 WWW.INTERPIONSEMI.COM -4- DIT8545 Ceratrans Driver for LCD Backlight ELECTRICAL CHARACTERISTICS (Ta = 25O C, VCC=5V, RT=13.8K, CT=1.5V, PROT=0V unless otherwise specified.) CHARACTERISTICS [ Output Driver Section ] Output High Voltage 1 Output High Voltage 2 Output High Voltage 3 Output Low Voltage 1 Output Low Voltage 2 Output Voltage with UVLO Activated Output Source Current Output Sink Current Voh1 Voh2 Voh3 Vol1 Vol2 Vouv Io(source) Io(sink) VCC = 3V, Io = 1uA VCC = 5V, Io = 1uA VCC = 8V, Io = 20mA VCC = 3V, Io = 100uA VCC=5V, Io = 1mA VCC=2V 2.0 3.5 2.5 0 20 20 2.4 4.5 3.3 0.1 0.2 0.2 2.8 5.5 4.2 0.4 0.4 0.4 V V V V V V mA mA SYMBOL CONDITIONS MIN TYP MAX UNIT Aug. 2002 WWW.INTERPIONSEMI.COM -5- DIT8545 Ceratrans Driver for LCD Backlight TYPICAL APPLICATION Vin ON/OFF & BURST DIMMING C2 B1 L1 CT1 1 CT R1 VCC 10 R10 D8545 2 RT ANALOG DIMMING R2 R3 R4 R5 GND C3 OUT 9 M1 RV1 3 EI C4 GND 8 C1 R11 4 EO 5 TONCTL C5 ON/OFF 7 R9 C7 D2 PROT 6 R8 R6 C6 D1 R7 Aug. 2002 WWW.INTERPIONSEMI.COM CCFL -6- DIT8545 Ceratrans Driver for LCD Backlight ELECTRICAL DIAGRAMS Duty(%) 70 VTCTRL vs DUTY CT=470p RT=13.8Kohm 60 50 40 30 20 10 0 0.0 0.5 1.0 1.5 2.0 VTCTRL(V) Fig.1 : VTCTRL vs. DUTY VTCTRL vs Frequency Frequency(kHz) 200 180 160 140 120 100 80 60 40 20 0 0.0 0.5 CT=470p RT=13.8Kohm 1.0 1.5 2.0 VTCTRL(V) Fig.2 : VTCTRL vs. Frequency Aug. 2002 WWW.INTERPIONSEMI.COM -7- DIT8545 Ceratrans Driver for LCD Backlight PACKAGE DIMENSION Aug. 2002 WWW.INTERPIONSEMI.COM -8- |
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