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TL497A Datasheet(PDF) 8 Page - Texas Instruments |
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TL497A Datasheet(HTML) 8 Page - Texas Instruments |
8 / 20 page TL497A 500mA PEAK STEPUP, STEPDOWN, INVERTING SWITCHING VOLTAGE REGULATOR SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 3-Term Reg < 12 V Switching Circuit Control 14 13 TL497A 5 VO VI VI VO R2 1 k Ω R1 Q2 10 mA RCL Vreg 14 13 5 TL497A CURRENT LIMIT FOR EXTENDED INPUT CONFIGURATION Q1 R CL + V BE(Q1) I limit (PK) R1 ) V I I B(Q2) R2 + Vreg * 1 10 kW Control DESIGN EQUATIONS Switching Circuit EXTENDED INPUT CONFIGURATION WITHOUT CURRENT LIMIT 3-Term Reg < 12 V Figure 4. Extended Input Voltage Range (VI > 12 V) |
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