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LT1082IT Datasheet(PDF) 4 Page - Linear Technology |
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LT1082IT Datasheet(HTML) 4 Page - Linear Technology |
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4 / 12 page  4 LT1082 CC HARA TERISTICS A TYPICALPERFOR CE Suggested Core Size and Inductance for Telecom 5V Supply Telecom 5V Supply Short-Circuit Frequency Shift-Down Minimum Input Voltage TEMPERATURE (°C) –75 2.9 2.8 2.7 2.6 2.5 2.4 2.3 –50 50 100 1082 G07 25 150 –25 0 75 125 ISW = 1A ISW = 0A Switch Saturation Voltage SWITCH CURRENT (A) 0 2.00 1082 G08 0.25 0.50 1.50 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 0.75 1.00 1.25 1.75 TJ = 150°C TJ = 100°C TJ = 25°C TJ = –50°C JUNCTION TEMPERATURE (°C) –75 2.2 2.0 1.8 1.6 1.4 1.2 1.0 –50 50 100 1082 G06 25 150 –25 0 75 125 Flyback Blanking Time Switch Current Limit TEMPERATURE (°C) –75 97 96 95 94 93 92 91 90 –50 50 100 1082 G05 25 150 175 –25 0 75 125 Maximum Duty Cycle DUTY CYCLE (%) 0 3 4 40 1082 G04 2 1 0 10 20 30 50 60 70 80 90 100 TJ = –55°C TJ = 150°C TJ = 25°C Short-Circuit Frequency Shift-Down vs Feedback Current FEEDBACK CURRENT ( µA) 0 300 1082 G03 100 200 800 70 60 50 40 30 20 10 0 400 500 600 700 TA = 150°C TA = 0°C TA = –55°C LOAD CURRENT 100mA 200mA 400mA 600mA 800mA TYPE 52 POWDERED IRON T38 250 µH T50 250 µH T60 250 µH T60 250 µH T80 350 µH KOOL M µ OR MOLY- PERMALLOY T38 200 µH T38 150 µH T50 150 µH T50 200 µH T80 350 µH 1082 GA POWER OUTPUT (W) 0 4 1082 G01 1 2 3 79 76 73 70 67 64 61 58 55 VIN = –20V VIN = –40V VIN = –60V VIN = –70V NOTE: THIS GRAPH IS BASED ON LOW CORE LOSS PERMALLOY INDUCTOR. IF POWDERED IRON CORE INDUCTOR IS USED, THE CORE LOSS IS TYPICALLY 100mW HIGHER. L = 250 µH R = 0.08 Ω Telecom 5V Supply Efficiency OUTPUT VOLTAGE (V) 6 54 3 2 1082 G02 80 70 60 50 40 30 20 10 0 10 TA = 25°C |
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