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UC3854N Datasheet(PDF) 3 Page - Texas Instruments |
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UC3854N Datasheet(HTML) 3 Page - Texas Instruments |
3 / 12 page PARAMETER TEST CONDITIONS MIN TYP MAX UNITS CURRENT AMPLIFIER Current Amp Offset Voltage –4 4 mV ISENSE Bias Current –500 –120 500 nA Input Range, ISENSE, Mult Out –0.3 to 2.5 V Current Amp Gain 80 110 dB Current Amp Output Swing 0.5 to 16 V Current Amp Short Circuit Current CA Out=0V –36 –20 –5 mA Current Amp Gain-BW Product TA=25 oC (Note 6) 400 800 kHz REFERENCE Reference Output Voltage IREF=0mA, TA=25 oC 7.4 7.5 7.6 V IREF=0mA, Over Temp. 7.35 7.5 7.65 V VREF Load Regulation –10mA<IREF<0mA –15 5 15 mV VREF Line Regulation 15V<VCC<35V –10 2 10 mV VREF Short Circuit Current REF=0V –50 –28 –12 mA MULTIPLIER Mult Out Current IAC Limited IAC=100 µA, RSET=10k, VRMS=1.25V –220 –200 –180 µA Mult Out Current Zero IAC=0 µA, RSET=15k –2.0 –0.2 2.0 µA Mult Out Current RSET Limited IAC=450 µA, RSET=15k, VRMS=1V, VA Out = 6V –280 –255 –220 µA Mult Out Current IAC=50 µA, VRMS=2V, VA=4V –50 –42 –33 µA IAC=100 µA, VRMS=2V, VA=2V –38 –27 –12 µA IAC=200 µA, VRMS=2V, VA=4V –165 –150 –105 µA IAC=300 µA, VRMS=1V, VA=2V –250 –225 –150 µA IAC=100 µA, VRMS=1V, VA=2V –95 –80 –60 µA Multiplier Gain Constant (Note 5) –1.0 V OSCILLATOR Oscillator Frequency RSET=15k 46 55 62 kHz RSET=8.2k 86 102 118 kHz CT Ramp Peak-to-Valley Amplitude 4.9 5.4 5.9 V CT Ramp Valley Voltage 0.8 1.1 1.3 V GATE DRIVER Maximum GT Drv Output Voltage 0mA load on GT Drv, 18V<VCC<35V 13 14.5 18 V GT Drv Output Voltage High –200mA load on GT Drv, VCC=15V 12 12.8 V GT Drv Output Voltage Low, Off VCC=0V, 50mA load on GT Drv 0.9 1.5 V GT Drv Output Voltage Low 200mA load on GT Drv 1.0 2.2 V 10mA load on GT Drv 0.1 0.4 V Peak GT Drv Current 10nF from GT Drv to Gnd 1.0 A GT Drv Rise/Fall Time 1nF from GT Drv to Gnd 35 ns GT Drv Maximum Duty Cycle VCA Out=7V 95 % CURRENT LIMIT PKLMT Offset Voltage –10 10 mV PKLMT Input Current PKLMT=–0.1V –200 –100 µA PKLMT to GT Drv Delay PKLMT falling from 50mV to –50mV 175 ns Unless otherwise stated, VCC=18V, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V, VRMS=1.5V, IAC=100 µA, ISENSE=0V, CA Out=3.5V, VA Out=5V, VSENSE=7.5V, no load on SS, CA Out, VA Out, REF, GT Drv, –55 oC<TA<125oC for the UC1854, –40oC<TA<85oC for the UC2854, and 0 oC<TA<70oC for the UC3854, and TA=TJ. UC1854 UC2854 UC3854 Note 5: Multiplier Gain Constant (k) is defined by: IMult Out = k × IAC × (VA Out−1) VRMS 2 Note 6: Guaranteed by design. Not 100% tested in production. ELECTRICAL CHARACTERISTICS 3 |
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