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| 型號： | LM2540-7EPAHF |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 50 W AC-DC REG PWR SUPPLY MODULE |
| 封裝： | METAL, CASE M02, MODULE |
| 文件頁數(shù)： | 3/25頁 |
| 文件大?。?/td> | 569K |
| 代理商： | LM2540-7EPAHF |
Cassette Style
DC-DC Converters
M Series
Edition 01/01.2001
11/25
Table 8a: R1 for Uo < Uo nom (conditions: Ui nom, Io nom, rounded up to resistor values E 96, R2 =
∞)
Uo nom = 5.1 V
Uo nom = 12 V
Uo nom = 15 V
Uo nom = 24 V
Uo nom = 48 V
Uo [V]
R1 [k]
Uo [V]
R1 [k]
Uo [V]
R1 [k]
Uo [V]
R1 [k]
Uo [V]
R1 [k]
0.5
0.432
2.0
0.806
2.0
0.619
4.0
0.806
8.0
0.806
1.0
0.976
3.0
1.33
4.0
1.47
6.0
1.33
12.0
1.33
1.5
1.65
4.0
2.0
6.0
2.67
8.0
2.0
16.0
2.0
2.61
5.0
2.87
8.0
4.53
10.0
2.87
20.0
2.87
2.5
3.83
6.0
4.02
9.0
6.04
12.0
4.02
24.0
4.02
3.0
5.76
7.0
5.62
10.0
8.06
14.0
5.62
28.0
5.62
3.5
8.66
8.0
8.06
11.0
16.0
8.06
32.0
8.06
4.0
14.7
9.0
12.1
12.0
16.2
18.0
12.1
36.0
12.1
4.5
30.1
10.0
20.0
13.0
26.1
20.0
40.0
20.0
5.0
200.0
11.0
44.2
14.0
56.2
22.0
44.2
44.0
44.2
Table 8b: R2 for Uo > Uo nom (conditions: Ui nom, Io nom, rounded up to resistor values E 96, R1 =
∞)
Uo nom = 5.1 V
Uo nom = 12 V
Uo nom = 15 V
Uo nom = 24 V
Uo nom = 48 V
Uo [V]
R2 [k]
Uo [V]
R2 [k]
Uo [V]
R2 [k]
Uo [V]
R2 [k]
Uo [V]
R2 [k]
5.15
464
12.1
1780
15.2
1470
24.25
3160
48.5
6810
5.20
215
12.2
909
15.4
750
24.50
1620
49.0
3480
5.25
147
12.3
619
15.6
511
24.75
1100
49.5
2370
5.30
110
12.4
464
15.8
383
25.00
825
50.0
1780
5.35
90.9
12.5
383
16.0
332
25.25
715
50.5
1470
5.40
78.7
12.6
316
16.2
274
25.50
590
51.0
1270
5.45
68.1
12.7
274
16.4
237
25.75
511
51.5
1100
5.50
61.9
12.8
249
16.5
226
26.00
453
52.0
953
13.0
200
26.25
402
52.5
845
13.2
169
26.40
383
52.8
806
R-Control for Output Voltage Adjustment
Notes: With open R input,
Uo
≈ U
o nom. R excludes option P.
As a standard feature, single output modules offer an
adjustable output voltage identified by letter R in the type
designation.
The output voltage
Uo1 can either be adjusted with an exter-
nal voltage (
Uext) or with an external resistor (R1 or R2). The
adjustment range is approximative 0…110% of
Uo nom. For
output voltages
Uo > Uo nom, the minimum input voltage ac-
cording to:
Electrical Input Data increases proportionally to
Uo/Uo nom.
Fig. 11
Voltage adjustment with external voltage Uext
a)
Uo ≈ 0...110% Uo nom, using Uext between R (14) and
G (17):
Uo
Uext
≈ 2.5 V –––––
Uo
≈ U
o nom –––––
Uo nom
2.5 V
Fig. 12
Voltage adjustment with external resistor R1 or R2
b)
Uo ≈ 0...100% Uo nom, using R1 between R (14) and
G (17):
R1
4000
U
o
Uo
≈ U
o nom –––––––––––
R1
≈ ––––––––––
R1 + 4000
Uo nom - Uo
c)
Uo ≈ Uo nom...Uo max, using R2 between R (14) and
Vo1+ (20):
Uo max = Uo nom + 10%
4000
U
o (Uo nom – 2.5 V)
R2
≈ ––––––––––––––––––––––––
2.5 V (
Uo – Uo nom)
Uo nom 2.5 V R2
Uo
≈ ––––––––––––––––––––––––––––––––
2.5 V (
R2 + 4000
) – U
o nom 4000
Vo1+
R
+
4000
G
Uref
Uext
–
+
06087
Caution: To prevent damage,
Uext should not exceed
8 V, nor be negative.
Vo1+
R
–
+
G
4000
Uref
R1
R2
06088
Caution: To prevent damage,
R2 should never be less
than 47 k
.
Note: R inputs of n units with paralleled outputs may be
paralleled, too, but if only one external resistor is to be
used, its value should be R1/n, or R2/n respectively.
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