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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3797 датащи(PDF) 4 Page - Linear Technology |
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LT3797 датащи(HTML) 4 Page - Linear Technology |
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4 / 36 page  LT3797 4 3797f For more information www.linear.com/LT3797 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 24V; EN/UVLO = 24V; CTRL1, CTRL2, CTRL3, PWM1, PWM2, PWM3 = 2V; SENSEN1, SENSEN2, SENSEN3 = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS ISN1, ISN2, ISN3 Input Bias Current (Idle) PWM1, PWM2, PWM3=0V , ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 48V 0 1 µA PWM1, PWM2, PWM3, ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 0V –20 nA LED Current Sense Amplifier gm ISP1-ISN1, ISP2-ISN2, ISP3-ISN3 = 250mV 250 μS FBH1, FBH2, FBH3 Regulation Voltage “FBH(REG)” (|ISP1-FBH1, ISP2-FBH2, ISP3-FBH3|) ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 48V l 1.225 1.250 1.275 V FBH1, FBH2, FBH3 Pin Input Bias Current ISP1-FBH1, ISP2-FBH2, ISP3-FBH3 = 1.25V ISP1-FBH1, ISP2-FBH2, ISP3-FBH3 = –1.25V 2 40 2.4 100 3 nA µA FBH1, FBH2, FBH3 Amplifier gm |ISP1-FBH1|, |ISP2-FBH2|, |ISP3-FBH3| = 1.25V 480 μS FBH1, FBH2, FBH3 Open-LED Threshold (|ISP1-FBH1|, |ISP2-FBH2|, |ISP3-FBH3|) Voltage Rising (Note 4) FBH(REG) – 0.07 FBH(REG) – 0.05 FBH(REG) – 0.04 V Hysteresis 20 mV FBH1, FBH2, FBH3 Overvoltage Threshold (|ISP1-FBH1|, |ISP2-FBH2|, |ISP3-FBH3|) Voltage Rising (Note 4) FBH(REG) + 0.05 FBH(REG) + 0.06 FBH(REG) + 0.085 V Hysteresis 25 mV VC1, VC2, VC3 Output Impedance 10 MΩ VC1, VC2, VC3 Standby Input Bias Current PWM1, PWM2, PWM3 = 0V CTRL1, CTRL2, CTRL3 = 0V –20 –20 20 20 nA nA VC1, VC2, VC3 Current Mode Gain –ΔVVC/ΔVSENSE 4 V/V VC1, VC2, VC3 Source Current ISP1, ISP2, ISP3, ISN1, ISN2, ISN3, FBH1, FBH2, FBH3 = 48V, Current Out of Pin 10.5 µA VC1, VC2, VC3 Sink Current ISP1, ISP2, ISP3, FBH1, FBH2, FBH3 = 48V, ISN1, ISN2, ISN3 = 47.7V 12 µA ISP1, ISP2, ISP3, ISN1, ISN2, ISN3 = 48V, FBH1, FBH2, FBH3 = 46.7V 32 µA Oscillator Switching Frequency RT = 140kΩ RT = 34.0kΩ RT = 10.7kΩ l 95 375 950 100 400 1000 107 425 1050 kHz kHz kHz RT Voltage 1.05 V GATE1, GATE2, GATE3 Minimum Off-Time CGATE = 3300pF 200 270 ns GATE1, GATE2, GATE3 Minimum On-Time CGATE = 3300pF 220 300 ns SYNC Input Low l 0.4 V SYNC Input High l 1.5 V SYNC Resistance to GND 200 kΩ Logic Inputs/Outputs EN/UVLO Threshold Voltage Falling l 1.180 1.220 1.250 V EN/UVLO Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN Drops Below 1µA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V l 1.5 2 2.6 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.33V 40 100 nA OVLO Pin Input Bias Current 20 100 nA OVLO Threshold Voltage Rising Hysteresis l 1.225 1.250 125 1.275 V mV |
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