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LM2576-3.3WT Datasheet(PDF) 6 Page - Micrel Semiconductor |
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LM2576-3.3WT Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 9 page M9999-082605-B 6 August 2005 LM2576 Micrel, Inc. Typical Performance Characteristics (continued) (Circuit of Figure 1) Supply Current INPUT VOLTAGE (V) 20 Measured at Ground Pin TJ = 25˚C VOUT = 5V 18 16 14 12 10 8 6 4 0 10 203040 5060 ILOAD to 1A Supply Current vs. Duty Cycle DUTY CYCLE (%) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0 0 20 40 60 80 100 VIN from 7V to 40V ILOAD = 200 mA JUNCTION TEMPERATURE (˚C) 200 150 100 50 0 -75 VIN = 12V Standby Quiescent Current VIN = 40V -50 -25 0 25 50 75 100 125 150 Current Limit JUNCTION TEMPERATURE (˚C) 3 2 1 0 -75 VIN = 25V INPUT VOLTAGE (V) 100 Efficiency VOUT = 12V -50 -25 0 25 50 75 100 125 150 95 90 85 80 75 70 65 60 200 mA 200 mA VOUT = 3V 1A 0 5 10 15 20 25 30 35 40 Minimum Operating Voltage JUNCTION TEMPERATURE (˚C) 5.0 ILOAD = 200 mA Line Regulation INPUT VOLTAGE (V) 14 0 JUNCTION TEMPERATURE (˚C) 100 -100 -75 Feedback Pin Current -50 -25 0 25 50 75 100 125 150 VOUT = 1.23V 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -75 -50 -25 0 25 50 75 100 125 150 12 10 8 6 4 2 0 -2 -4 -6 5 10 15202530 75 50 25 0 -25 -50 -75 JUNCTION TEMPERATURE (˚C) +8 -8 -75 Oscillator Frequency -50 -25 0 25 50 75 100 125 150 +6 +4 +2 0 -2 -4 --6 VIN = 12V VIN = 40V Normalized at 25˚C Normalized to VIN = 10V VOUT = 5V ILOAD = 500mA TJ = 25 VON/OFF = 5V Switch Saturation Voltage SWITCH CURRENT (A) 1.2 -55˚C 1.0 0.8 0.6 0.4 0 0.2 0.4 0.6 0.8 1.0 25˚C 125˚C 150˚C -40˚C Dropout Voltage JUNCTION TEMPERATURE (˚C) 2.0 -75 -50 -25 0 25 50 75 100 125 150 ∆VOUT = 5% RIND = 0.2Ω ILOAD = 1A ILOAD = 200 mA 1.5 1.0 0.5 0 Normalized Output Voltage JUNCTION TEMPERATURE (˚C) 100 75 50 25 0 -25 -50 -75 -100 -75 -50 -25 0 25 50 75 100 125 150 VIN = 12V ILOAD = 200mA Normalized to TJ = 25˚C 1A |
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