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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT8331 датащи(PDF) 3 Page - Analog Devices |
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LT8331 датащи(HTML) 3 Page - Analog Devices |
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3 / 34 page  LT8357 3 Rev. 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 3). VIN = 12V, EN/UVLO = 1.5V, CINTVCC = 2.2µF to GND, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Linear Regulator INTVCC Regulation Voltage IINTVCC = 20mA 4.70 4.95 5.20 V INTVCC Current Limit VINTVCC = 4.5V 40 60 80 mA INTVCC Undervoltage Lockout Threshold Falling 2.4 2.5 2.6 V INTVCC Undervoltage Lockout Hysteresis 100 mV Error Amplifier FB Regulation Voltage l 0.985 1.000 1.015 V FB Line Regulation 3V < VIN < 60V 0.1 0.4 % FB Input Bias Current VFB = 1V –20 20 nA FB Error Amplifier Transconductance gm 200 µS VC Output Impedance 2 MΩ Current Comparator SENSE Maximum Current Threshold VFB = 0.85V, VSYNC/MODE = 0V l 45 60 75 mV SENSE Burst Current Threshold VFB = 1.05V, VSYNC/MODE = 0V 10 mV SENSE Over Current Threshold 105 mV SENSE Pin Bias Current VFB = 1.05V, VSENSE = 0V, Out of Pin 27 µA Fault PGOOD Upper Threshold Offset from VFB Rising l 6 8 10 % PGOOD Lower Threshold Offset from VFB Falling l –10 –8 –6 % PGOOD Pull-Down Resistance 110 Ω SS Strong Pull-Down Resistance 55 Ω SS Pull-Up Current VSS = 0V 15 µA SS Pull-Down Current VSS = 2V 1.5 µA Oscillator Switching Frequency RT = 95.3kΩ RT = 15.0kΩ l 315 1900 350 2000 385 2100 kHz kHz SYNC Frequency fSYNC/MODE = fRT 100 2000 kHz SYNC Threshold Voltage 0.4 2.5 V Highest Spread Spectrum Above Oscillator Frequency VSYNC/MODE = 5V, RT = 95.3kΩ VSYNC/MODE = 5V, RT = 15.0kΩ 19 19 % % Gate Driver GATE Pull-Up Resistance 2.2 Ω GATE Pull-Down Resistance 0.9 Ω GATE Minimum Duty Cycle RT = 95.3kΩ RT = 15.0kΩ 2 8 3.5 11 5 14 % % GATE Maximum Duty Cycle RT = 95.3kΩ RT = 15.0kΩ 92.5 87 95 90 97.5 93 % % |
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