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UA723CNSRG4 Arkusz danych(PDF) 5 Page - Texas Instruments |
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UA723CNSRG4 Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 21 page µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Table 2. Formulas for Intermediate Output Voltages OUTPUTS FROM 2 V TO 7 V SEE FIGURES 1, 5, 6, 9, 11, 12 (4) AND NOTE 5 OUTPUTS FROM 4 V TO 250 V SEE FIGURE 7 AND NOTE 5 CURRENT LIMITING V O + V(ref) R2 R1 ) R2 V O + V (ref) 2 R2–R1 R1 R3 + R4 I (limit) [ 0.65 V R SC OUTPUTS FROM 7 V TO 37 V SEE FIGURES 2, 4, (5, 6, 9, 11, 12) AND NOTE 5 OUTPUTS FROM –6 V TO –250 V SEE FIGURES 3, 8, 10 AND NOTES 5 AND 7 FOLDBACK CURRENT LIMITING SEE FIGURE 6 V O + V(ref) R1 ) R2 R2 V O + – V (ref) 2 R1 ) R2 R1 R3 + R4 I (knee) [ V OR3 ) (R3 ) R4) 0.65 V R SCR4 I OS [ 0.65 V R SC R3 ) R4 R4 NOTES: 5. The R1/R2 divider can be across either VO or V(ref). If the divider is across V(ref), use figure numbers without parentheses. If the divider is across VO, use the figure numbers in parentheses. 7. For Figures 3, 8, and 10, the device requires a minimum of 9 V between VCC+ and VCC– when VO is equal to or more positive than –9 V. REF VI VCC+ VC OUTPUT VZ CURR LIM CURR SENS IN+ VCC– FREQ COMP IN– RSC R1 C(ref) R2 100 pF Regulated Output, VO R3 (see Notes A and B) µA723 NOTES: A. B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0). R3 + R1 R2 R1 ) R2 for a minimum a V O Figure 1. Basic Low-Voltage Regulator (VO = 2 V to 7 V) |
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