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LM2575BU Datasheet(PDF) 9 Page - Micrel Semiconductor |
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LM2575BU Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 12 page Micrel, Inc. LM2575 May 2009 9 M9999-051209-B Functional Characteristics (circuit of Figure 1) Load Transient Response 100µs/div. +100mV 0 –100mV Output Voltage Change 1.0A 0.5A 0 Output Current VOUT = 5V Switching Waveforms 10V 0 1A 0 1A .5A 0 A B C D A: Output pin voltage 10V/div B: Output pin current 1A/div C: Inductor current 0.5A/div D: Output ripple voltage 20 mV/div. AC coupled Horizontal Time Base: 5µs/div VOUT = 5V VIN = 20V Functional Diagrams ON/OFF COMPARATOR FIXED GAIN ERROR AMP 1 AMP SWITCH OUT DRIVER + - + - VIN FB 1.23V BAND-GAP REFERENCE 52 kHz OSCILLATOR RESET THERMAL SHUTDOWN CURRENT LIMIT 5 2 3 1 Note: Pin numbers are for the TO-220 package INTERNAL REGULATOR ON/OFF GND 3.1k 1.0k 4 Fixed Regulator ON/OFF COMPARATOR FIXED GAIN ERROR AMP 1 AMP SWITCH OUT DRIVER + - + - VIN FB 1.23V BAND-GAP REFERENCE 52 kHz OSCILLATOR RESET THERMAL SHUTDOWN CURRENT LIMIT 5 2 3 1 4 INTERNAL REGULATOR ON/OFF GND Adjustable Regulator |
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