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DIT8545 数据表(PDF) 4 Page - Interpion semiconductor |
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DIT8545 数据表(HTML) 4 Page - Interpion semiconductor |
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4 / 8 page ![]() DIT8545 Aug. 2002 - 4 - WWW.INTERPIONSEMI.COM Ceratrans Driver for LCD Backlight CHARACTERISTICS SYMBOL CONDITIONS MIN TYP MAX UNIT Operating Frequency Fosc CT=470pF 120 135 150 kHz Frequency Change With Supply Voltage Dfosc VCC=5V to 12V - 0.3 1.5 %/V Minimum Duty Ratio Dmin TONCTL = 0V 10 20 30 % Maximum Duty Ratio Dmax TONCTL = 3V 55 65 75 % TONCTL Input Bias Current Ib(TON) TONCTL = 0V - -0.1 -1 uA [ UVLO Section ] Upper Threshold Voltage VthH VCC Variation 2.6 2.8 2.95 V Lower Threshold Voltage VthL VCC Variation 2.4 2.6 2.8 V UVLO Hysteresis Voltage Vhys VCC Variation 0.1 0.2 0.4 V [ ON/OFF Section ] ON/OFF Logic High Voltage Von/off - 1 1.3 1.8 V ON/OFF Input Bias Current Ib(on/off) ON/OFF=2V 5 20 50 uA [ Error Amplifier Section] Erramp Input Bias Current Ib(EI) -0.1 -1 uA Inverting Reference Voltage Vfb 1.220 1.260 1.300 V Erramp Output Source Cur- rent Isource 3 10 30 mA Erramp Output Sink Current Isink 5 15 40 mA Erramp Output High Voltage Vhigh 3.2 4.2 4.5 V Erramp Output Low Voltage Vlow - 0.1 0.4 V [ Open Lamp Protection Section ] Protection Input Bias Cur- rent Iprot PROT=1.5V - 1 40 uA Protection Input Voltage Vprot - 1 1.35 1.60 V ELECTRICAL CHARACTERISTICS (Ta = 25OC, VCC=5V, RT=13.8K CT=1.5V, PROT=0V unless otherwise specified.) |
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