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TL497APW Folha de dados(PDF) 7 Page - Texas Instruments |
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TL497APW Folha de dados(HTML) 7 Page - Texas Instruments |
7 / 9 page TL497A SWITCHING VOLTAGE REGULATORS SLVS009D – JUNE 1976 – REVISED JULY 1999 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION VI VI RCL 14 13 10 8 TL497A 12 3 4 5 CT R1 R2 = 1.2 k Ω CO RCL 14 13 10 8 R1 CT L VO L VO 12 3 4 5 DESIGN EQUATIONS I (PK) + 2I O max 1 ) 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 (10 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) EXTENDED POWER CONFIGURATION (using external transistor) † R2 = 1.2 k Ω † TL497A CO BASIC CONFIGURATION (Peak Switching Current = I(PK) < 500 mA) † Use external catch diode, e.g., 1N4001, when building an inverting supply with the TL497A. Figure 3. Inverting Applications |
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