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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3402 датащи(PDF) 3 Page - Linear Technology |
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LTC3402 датащи(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC1871X 3 1871xf For more information www.linear.com/LTC1871X ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop VIN(MIN) Minimum Input Voltage 2.5 V (Note 2) l 2.5 V IQ Input Voltage Supply Current (Note 4) Continuous Mode VMODE/SYNC = 5V, VFB = 1.4V, VITH = 0.75V 550 1000 μA VMODE/SYNC = 5V, VFB = 1.4V, VITH = 0.75V, (Note 2) l 550 1200 μA Burst Mode Operation, No Load VMODE/SYNC = 0V, VITH = 0.2V (Note 5) 250 500 μA VMODE/SYNC = 0V, VITH = 0.2V (Note 5), (Note 2) l 250 650 μA Shutdown Mode VRUN = 0V 10 20 μA VRUN = 0V, (Note 2) l 10 65 μA VRUN+ Rising RUN Input Threshold Voltage 1.348 V VRUN– Falling RUN Input Threshold Voltage 1.223 1.248 1.273 V (Note 2) l 1.179 1.465 V VRUN(HYST) RUN Pin Input Threshold Hysteresis 50 100 150 mV (Note 2) l 35 400 mV IRUN RUN Input Current 1 60 nA VFB Feedback Voltage VITH = 0.2V (Note 5) 1.218 1.230 1.242 V VITH = 0.2V (Note 5), (Note 2) l 1.205 1.255 V IFB FB Pin Input Current VITH = 0.2V (Note 5) 18 60 nA ∆VFB ∆VIN Line Regulation 3.5V ≤ VIN ≤ 30V 0.002 0.02 %/V 3.5V ≤ VIN ≤ 30V, (Note 2) l 0.002 0.02 %/V ∆VFB ∆VITH Load Regulation VMODE/SYNC = 0V, VITH = 0.5V to 0.9V (Note 5) –1 –0.1 % VMODE/SYNC = 0V, VITH = 0.5V to 0.9V (Note 5) (Note 2) l –1 –0.1 % ∆VFB(OV) ∆FB Pin,Overvoltage Lockout VFB(OV) – VFB(NOM) in Percent 2.5 6 10 % gm Error Amplifier Transconductance ITH Pin Load = ±5μA (Note 5) 650 μmho VITH(BURST) Burst Mode Operation ITH Pin Voltage Falling ITH Voltage (Note 5) 0.3 V VSENSE(MAX) Maximum Current Sense Input Threshold Duty Cycle < 20% 115 150 185 mV Duty Cycle < 20%, (Note 2) l 100 200 mV ISENSE(ON) SENSE Pin Current (GATE High) VSENSE = 0V 35 50 μA ISENSE(OFF) SENSE Pin Current (GATE Low) VSENSE = 30V 0.1 5 μA Oscillator fOSC Oscillator Frequency RFREQ = 80k 250 300 350 kHz RFREQ = 80k, (Note 2) l 240 300 375 kHz Oscillator Frequency Range 50 1000 kHz (Note 2) l 65 900 kHz DMAX Maximum Duty Cycle 87 92 97 % (Note 2) l 87 92 97 % The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VINTVCC = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specified. |
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