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LT1576-5 Datasheet(PDF) 5 Page - Linear Technology |
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LT1576-5 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 28 page  5 LT1576/LT1576-5 TYPICAL PERFORMANCE CHARACTERISTICS Kool M µ is a registered trademark of Magnetics, Inc. JUNCTION TEMPERATURE ( °C) –50 240 220 200 180 160 100 1576 G13 –25 0 25 50 75 125 Switching Frequency INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1576 G15 25 VOUT = 10V L = 60 µH L = 30 µH L = 15 µH Maximum Load Current at VOUT = 10V LOAD CURRENT (mA) 1 7 6 5 10 VOUT = 5V 100 1000 1576 G14 MINIMUM STARTING VOLTAGE MINIMUM RUNNING VOLTAGE Minimum Input Voltage at VOUT = 5V INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1576 G16 25 VOUT = 5V L = 60 µH L = 30 µH L = 15 µH Maximum Load Current at VOUT = 5V INDUCTANCE ( µH) 05 1.0 0.1 0.01 0.001 10 15 20 20 12 8 4 2 1.2 0.8 0.4 0.2 0.12 0.08 0.04 0.02 25 1576 G18 TYPE 52 POWDERED IRON Kool M µ® PERMALLOY µ = 125 VOUT = 5V, VIN = 10V, IOUT = 1A CORE LOSS IS INDEPENDENT OF LOAD CURRENT UNTIL LOAD CURRENT FALLS LOW ENOUGH FOR CIRCUIT TO GO INTO DISCONTINUOUS MODE Inductor Core Loss INPUT VOLTAGE (V) 0 1.50 1.25 1.00 0.75 0.50 0.25 0 510 15 20 1576 G17 25 VOUT = 3.3V L = 30 µH L = 15 µH L = 60 µH Maximum Load Current at VOUT = 3.3V FEEDBACK VOLTAGE (V) 0 2.0 1576 G12 0.5 1.0 1.5 250 200 150 100 50 0 FEEDBACK PIN CURRENT SWITCHING FREQUENCY Shutdown Supply Current JUNCTION TEMPERATURE ( °C) –50 100 1576 G11 050 1600 1400 1200 1000 800 600 400 200 0 –25 25 75 125 Error Amplifier Transconductance Frequency Foldback SHUTDOWN VOLTAGE (V) 0 0.4 1576 G10 0.1 0.2 0.3 100 75 50 25 0 VIN = 25V VIN = 10V |
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