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TL497AIDRE4 데이터시트(PDF) 5 Page - Texas Instruments |
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TL497AIDRE4 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 16 page TL497A 500mA PEAK STEPUP, STEPDOWN, INVERTING SWITCHING VOLTAGE REGULATOR SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION VI L 14 13 10 8 7 6 5 4 3 2 1 TL497A R2 = 1.2 k Ω R1 VO CO BASIC CONFIGURATION (Peak Switching Current = I(PK) < 500 mA) VI RCL L R1 8 10 13 14 12 3 4 5 EXTENDED POWER CONFIGURATION (using external transistor) TL497A DESIGN EQUATIONS I (PK) + 2I O max V O V I L( mH) + V I I (PK) ton (ms) C T (pF) [ 12 ton (ms) R1 + (V O –1.2 V) k W Choose L (50 to 500 µH), calculate ton (25 to 150 µs) R CL + 0.5 V I (PK) C O ( mF) [ ton(ms) V I V O I (PK) ) I O V ripple (PK) CT R2 = 1.2 k Ω VO CO CT RCL Figure 1. Positive Regulator, Step-Up Configurations |
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