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LT1082IQ Datasheet(PDF) 3 Page - Linear Integrated Systems |
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LT1082IQ Datasheet(HTML) 3 Page - Linear Integrated Systems |
3 / 12 page 3 LT1082 sn1082 1082fas ELECTRICAL C C HARA TERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ Supply Current 3V ≤ VIN ≤ VMAX, VC = 0.6V 4.5 7.0 mA Control Pin Threshold Duty Cycle = 0 0.7 0.9 1.1 V q 0.5 1.25 V Normal/Flyback Threshold 0.58 0.67 0.8 V on Feedback Pin f Switching Frequency 50 60 70 kHz q 45 75 kHz 800 µA ≥ IFB ≥ 450µA 12 kHz BV Output Switch Breakdown Voltage 3V ≤ VIN ≤ VMAX, ISW = 1.5mA q 100 115 V Control Voltage to Switch 1.5 A/V Current Transconductance VFB Flyback Reference Voltage IFB = 60µA 17 18.6 20.5 V q 16 21.5 V Change in Flyback Reference Voltage 60 µA ≤ IFB ≤ 200µA 3.5 4.6 6.5 V Flyback Reference Voltage Line Regulation IFB = 60µA, 3V ≤ VIN ≤ VMAX 0.01 0.03 %/V Flyback Amplifier Transconductance (gm) ∆IC = ±10µA 150 300 500 µmho Flyback Amplifier Source VC = 0.6V Source q 15 32 70 µA and Sink Current IFB = 60µA Sink q 30 50 90 µA VSAT Output Switch “On” Resistance (Note 2) ISW = 0.7A (LT1082C), ISW = 0.5A (LT1082M) q 0.8 1.2 Ω ILIM Switch Current Limit Duty Cycle = 20% q 1.07 2.6 A (LT1082C) Duty Cycle ≤ 50% q 1.0 2.6 A Duty Cycle = 80% (Note 3) q 0.8 2.4 A Switch Current Limit Duty Cycle = 20% q 0.85 2.8 A (LT1082I) Duty Cycle ≤ 50% q 0.8 2.8 A Duty Cycle = 80% (Note 3) q 0.65 2.6 A Switch Current Limit Duty Cycle = 20% q 0.75 3.0 A (LT1082M) Duty Cycle ≤ 50% q 0.7 3.0 A Duty Cycle = 80% (Note 3) q 0.6 2.8 A ∆IIN Supply Current Increase 35 45 mA/A ∆ISW During Switch-On Time DCMAX Maximum Switch Duty Cycle 85 92 97 % Flyback Sense Delay Time 1.5 µs Shutdown Mode Supply Current 3V ≤ VIN ≤ VMAX, VC = 0.05V 120 350 µA Shutdown Mode 3V ≤ VIN ≤ VMAX 70 150 250 mV Threshold Voltage q 50 300 mV Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Measured with VC in hi clamp, VFB = 0.8V. Note 3: For duty cycles (DC) between 50% and 80%, minimum guaranteed switch current decreases linearly. The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise specified. |
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