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UC3844A датащи(PDF) 3 Page - First Components International |
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UC3844A датащи(HTML) 3 Page - First Components International |
3 / 6 page ELECTRICAL CHARACTERISTICS Item Symbol Min Typ Max Unit Voltage Feedback Input (VO = 2.5V) VFB 2.42 2.5 2.58 V Input Bias Current (VFB = 2.7V) IIB --- -0.1 -2.0 µA Open Loop Voltage Gain (VO = 2.0V to 4.0V) AVOL 65 90 --- dB Unity Gain Bandwidth (TJ = 25oC) BW 0.7 1.0 --- MHz Power Supply Rejection Ratio (VCC = 12V to 25V) PSRR 60 70 --- dB Output Current mA Sink (VO = 1.1V, VFB = 2.7V) ISink 2.0 12 --- Source (VO = 5.0V, VFB = 2.3V) ISource -0.5 -1.0 --- Output Voltage Swing V High State (RL = 15k to GND, VFB = 2.3V) VOH 5.0 6.2 --- Low State (RL = 15k to VREF, VFB = 2.3V) VOL --- 0.8 1.1 ERRORAMPLIFIERSECTION UC3844A High Performance Current Mode Controller Current Sense Input Voltage Gain (Notes 4 & 5) AV 2.85 3.0 3.15 V/V Maximum Current Sense Input Threshold (Note 4) VTH 0.9 1.0 1.1 V Power Supply Rejection Ratio (VCC = 12V to 25V) PSRR --- 70 --- dB Input Bias Current IIB --- -2.0 -10 µA Propagation Delay (Current Sense Input to Output) tPLH(in/out) --- 150 300 ns CURRENTSENSESECTION Output Voltage V Low State (ISink = 20mA) VOL --- 0.1 0.4 (ISink = 200mA) --- 1.6 2.2 High State (ISink = 20mA) VOH 13 13.5 --- (ISink = 200mA) 12 13.4 --- Output Voltage with UVLO Activated VOL(UVLO) V (VCC = 6.0V, ISink = 1.0mA) --- 0.1 1.1 Output Voltage Rise Time (CL = 1.0nF, TJ = 25oC) tr --- 50 150 ns Output Voltage Fall Time (CL = 1.0nF, TJ = 25oC) tf --- 50 150 ns OUTPUTSECTION Startup Threshold Vth 14.5 16 17.5 V Minimum Operating Voltage After Turn-On VCC(min) 8.5 10 11.5 V UNDERVOLTAGELOCKOUTSECTION Duty Cycle Max. DCmax 47 48 50 % Min. DCmin --- --- 0 PWMSECTION Power Supply Current (VCC = 14V) (Note 2) ICC mA Startup --- 0.17 0.3 Operating --- 12 17 Power Supply Zener Voltage VZ 30 36 --- V TOTALDEVICE 4-26 |
Аналогичный номер детали - UC3844A |
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Аналогичное описание - UC3844A |
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