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VCD40-D48-S15 Datasheet(PDF) 5 Page - CUI INC

Part # VCD40-D48-S15
Description  DC/DC converter
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Manufacturer  CUI [CUI INC]
Direct Link  http://www.cui.com
Logo CUI - CUI INC

VCD40-D48-S15 Datasheet(HTML) 5 Page - CUI INC

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DESCRIPTION: DC/DC converter
5 of 5
10/2007
20050
SW 112th Ave. Tualatin, Oregon 97062
phone
phone 503.612.2300 fax
fax 503.612.2382
PART NUMBER: VCD40 series
+Vin
-Vin
-Vout
+Vout
R adj,up
R-Load
Trim
+Sense
-Sense
In order to trim the voltage up or down one needs to connect the trim resistor either between the trim pin and -Vo for trim-up and between trim
pin and +Vo for trim-down. The output voltage trim range is ±10%. This is shown in Figures 1 and 2:
Figure 1. Trim-up Voltage Setup
+Vin
-Vin
-Vout
+Vout
R adj,down
R-Load
Trim
+Sense
-Sense
Figure 2. Trim-down Voltage Setup
Model Number
Output Voltage(V)
R1 (Kohm)
R2 (Kohm)
R3 (Kohm)
Rt (Kohm)
Vr
3.3V
2.74
1.8
0.27
9.1
1.24
12V
6.8
2.4
2.32
22
2.5
15V
8.06
2.4
3.9
27
2.5
)
(K
)
1
(
,
Ω
-
-
x
=
-
Rt
V
Vo
Vr
R
R
nom
o
up
trim
1.
The value of Rtrim-up defined as:
Where: R trim-up is the external resistor in Kohm.
Vo,nom is the nominal output voltage.
Vo is the desired output voltage.
R1 ,Rt and Vr are internal to the unit and are defined in Table 1.
Table 1 - Trim Resistor Values
Model Number
Output Voltage(V)
R1 (Kohm)
Rt (Kohm)
Vr
For example, to trim-up the output voltage of 5.0V module
(VCD40-D48-S5) by 5% to 5.25V, R trim-up is calculated as follows:
Vo – Vo,nom = 5.25 – 5.0 = 0.25V
R1 = 2.32 Kohm
Rt = 8.2 Kohm , Vr= 2.5
)
(K
15
2
.
8
25
.
0
5
.
2
32
.
2
Ω
=
-
x
=
- up
trim
R
The value of R trim-down defined as:
)
(K
)
(
1
,
Ω
-
-
-
x
=
-
Rt
Vo
V
Vr
Vo
R
R
nom
o
down
trim
Where: R trim-down is the external resistor in Kohm.
Vo,nom is the nominal output voltage.
Vo is the desired output voltage.
R1 ,Rt and Vr are internal to the unit and are defined in Table 1.
For example, to trim-down the output voltage of 5.0V module
(VCD40-D48-S5) by 5% to 4.75V, R trim-down is calculated as follows :
Vo,nom – Vo = 5.0 – 4.75 = 0.25 V
R1 = 2.32 Kohm
R t = 8.2 Kohm , Vr=2.5
)
(K
68
.
12
2
.
8
25
.
0
)
5
.
2
75
.
4
(
32
.
2
Ω
=
-
-
x
=
- down
trim
R
2.
The output Voltage 3.3V,12V and 15V value of Rtrim are
defined as below:
)
(K
)
2
)
(
)
3
2
(
1
(
,
Ω
-
x
-
+
x
x
=
-
Rt
R
V
Vo
R
R
R
Vr
R
nom
o
up
trim
)
(K
Ω
)
1
2
)
(
1
(
1
,
-
-
x
-
x
x
=
-
Rt
R
Vo
V
R
Vr
R
R
nom
o
down
trim
Where: R trim-up is the external resistor in Kohm.
Vo,nom is the nominal output voltage.
Vo is the desired output voltage.
R1, R2, R3, Rt and Vr are internal to the unit and are defined in Table 2.
Table 2 - Trim Resistor Values
VCD40-D24-S5
VCD40-D48-S5
5.0
2.32
8.2
2.5
VCD40-D24-S3R3
VCD40-D48-S3R3
VCD40-D24-S12
VCD40-D48-S12
VCD40-D24-S15
VCD40-D48-S15
TRIM INFORMATION


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