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LM2575BT Datasheet(PDF) 7 Page - Micrel Semiconductor |
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LM2575BT Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 12 page Micrel, Inc. LM2575 May 2009 7 M9999-051209-B Typical Characteristics (circuit of Figure 1) Supply Current INPUT VOLTAGE ( V) 20 Measured at Ground Pin TJ VOUT = 5V 18 16 14 12 10 8 6 4 0 10 203040 5060 I LO AD to 1A Supply Current vs. Duty Cycle DUTY CYC LE ( %) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.0 0 020 40 60 80 100 VIN from 7V to 40V ILOAD= 200 mA 200 150 100 50 0 -75 VIN= 12V Standby Quiescent Current VIN = 40V -50 -25 0 25 50 75 100 125150 Current Limit 3 2 1 0 -75 VIN = 25V INPUT VOLTAGE ( V) 100 Efficiency VOUT = 12V -50 -25 0 25 50 75 100125 150 95 90 85 80 75 70 65 60 200 mA 200 mA V OUT = 3V 1A 0 5 10 15 20 25 30 35 40 Minimum Operating Voltage 5.0 ILOAD= 200 mA Line Regulation INPUT VOLTAGE (V) 14 0 100 -100 -75 Feedback Pin Current -50 -25 0 25 50 75 100 125150 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 100125150 12 10 8 6 4 2 0 -2 -4 -6 5 10 15 202530 75 50 25 0 -25 -50 -75 +8 -8 -75 Oscillator Frequency -50 -25 0 25 50 75 100125150 +6 +4 +2 0 -2 -4 --6 VIN = 12V VIN = 40V Normalized at 25C Normalized toVIN = 10V VOUT = 5V I LO AD = 500mA TJ = 25 VON/OFF= 5V Switch Saturation Voltage SW I TCH CURREN T (A) 1.2 -55 C 1.0 0.8 0.6 0.4 0 0.20.4 0.60.8 1.0 25 C 125 C 150 C -40 C Dropout Voltage 2.0 -75 -50 -25 0 25 50 75 100125150 VOUT = 5% RIND = 0.2 ILOAD= 1A I LOAD= 200 mA 1.5 1.0 0.5 0 Normalized Output Voltage 100 75 50 25 0 -25 -50 -75 -100 -75 -50 -25 0 25 50 75 100125150 VIN = 12V ILOAD = 200mA Normalized toTJ = 25 C 1A |
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