參數(shù)資料
型號： LH1901-2R-D5
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT AC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT PACKAGE-32/11
文件頁數(shù)： 2/21頁
文件大小： 984K
代理商： LH1901-2R-D5
H Series Data Sheet
70 Watt AC-DC Converters
BCD20019 Rev AA
Page 10 of 21
www.power-one.com
Table 6a: Rext1 for Vo < Vo nom (conditions: Vi nom, Io nom, rounded up to resistor values E 96, Rext2 is not fitted )
Vo nom = 5.1 V
Vo nom = 12 V
Vo nom = 15 V
Vo nom = 24 V
Vo nom = 48 V
Vo [V]
Rext1 [k
]
Vo [V]
Rext1 [k
]
Vo [V]
Rext1 [k
]
Vo [V]
Rext1 [k
]
Vo [V]
Rext1 [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 6b: R2 for Vo > Vo nom (conditions: Vi nom, Io nom, rounded up to resistor values E 96, Rext1 is not fitted )
Vo nom = 5.1 V
Vo nom = 12 V
Vo nom = 15 V
Vo nom = 24 V
Vo nom = 48 V
Vo [V]
Rext2 [k
]
Vo [V]
Rext2 [k
]
Vo [V]
Rext2 [k
]
Vo [V]
Rext2 [k
]
Vo [V]
Rext2 [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
As a standard feature, single-output models offer an
adjustable output voltage identified by letter R in the type
designation.
Note:
With open R input, Vo = Vo nom.
The output voltage Vo can either be adjusted by an external
voltage (Vext) or by an external resistor (Rext1 or Rext2). The
adjustment range is approximative 0 – 110% of Vo nom. For
output voltages Vo > Vo nom, the minimum input voltage Vi min
specified in Electrical Input Data increases proportionally to
Vo/Vo nom.
Fig. 13
Output voltage adjustment
a) Adjustment by means of an external resistor Rext:
Depending upon the value of the required output voltage,
the resistor shall be connected:
either:
Between the R and G pin to achieve an output
voltage adjustment range of Vo
≈ 0 to 100% of Vo nom.
Vo
Rext1
≈ 4 k –––––––––
Vo nom – Vo
or:
Between the R pin and Vo+ to achieve an output
voltage range of Vo
≈ 100 to 110% of Vo nom.
(Vo – 2.5 V)
Rext2
≈ 4 k ––––––––––––––––––
2.5 V (Vo/Vo nom – 1)
Caution:
To prevent damage, Rext2 should never be less than
47 k
.
Note:
R inputs of n converters with paralleled outputs may be
paralleled too, but if only one external resistor is used, its
value should be Rext1/n or Rext2 /n respectively.
b) Adjustment by means of an external control voltage Vext
between G and R pin:
The control voltage range is 0 to 2.75 V and allows for
adjustment in the range of Vo
≈ 0 to 110% of Vo nom.
Vo 2.5 V
Vext
≈ ––––––––
Vo nom
Caution:
The external control voltage should be in the range
0 to +3 V to prevent the converter from damage.
R
Vo+
G
+
Vext
-
4 k
Vref = 2.5 V
Control
logic
Rext1
Rext2
06087a
Vi–
Vi+
17
14
+
8
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