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UA723CNSRE4 Arkusz danych(PDF) 5 Page - Texas Instruments

Numer części UA723CNSRE4
Szczegółowy opis  PRECISION VOLTAGE REGULATORS
Download  21 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

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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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