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TL497APW Datasheet(PDF) 6 Page - Texas Instruments |
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TL497APW Datasheet(HTML) 6 Page - Texas Instruments |
6 / 9 page TL497A SWITCHING VOLTAGE REGULATORS SLVS009D – JUNE 1976 – REVISED JULY 1999 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION DESIGN EQUATIONS I (PK) + 2I O max L( mH) + V I –V O 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 (10 to 150 µs) R CL + 0.5 V I (PK) C O ( mF) [ ton(ms) V I * V O V O I (PK) ) I O V ripple (PK) VI RCL 8 10 13 14 TL497A 1 2 345 6 7 R2 = 1.2 k Ω R1 CO VO VI RCL 14 13 10 8 12 3 4 5 6 7 TL497A L R1 R2 = 1.2 k Ω EXTENDED POWER CONFIGURATION (using external transistor) L VO CO CT CT BASIC CONFIGURATION (Peak Switching Current = I(PK) < 500 mA) Figure 2. Positive Regulator, Step-Down Configurations |
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