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參數(shù)資料
| 型號(hào)： | UA723MU |
| 元件分類： | RS-485 |
| 英文描述： | Low power RS-485/RS-422 transceiver |
| 中文描述： | 積極可調(diào)電壓穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/17頁(yè) |
| 文件大?。?/td> | 469K |
| 代理商： | UA723MU |
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μ
A723
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
R3
V
(ref)
2
R4
R2 – R1
R1
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
R4
R1
R2
R1
R3
I
(knee)
V
O
R3
(R3
R
SC
R4
R4) 0.65 V
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)
μ
A723
NOTES: A.
B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0).
R3
R1
R1
R2
VO
Figure 1. Basic Low-Voltage Regulator (V
O
= 2 V to 7 V)
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