VHB50W-Q48-S28 CUI Inc, VHB50W-Q48-S28 Datasheet - Page 6

• Manufacturer Part Number: VHB50W-Q48-S28
• Description: CONVERTER DC/DC 28V 1.79A 50W
• Manufacturer: CUI Inc
• Series: V-Infinity VHB50Wr
• Type: Isolatedr

Specifications of VHB50W-Q48-S28

• Output: 28V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 18 ~ 75V
• Package / Case: 9-DIP Module
• 1st Output: 28 VDC @ 1.78A
• Size / Dimension: 2.40" L x 2.28" W x 0.50" H (61mm x 57.9mm x 12.7mm)
• Power (watts) - Rated: 50W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 84%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Other names: 102-1967

PART NUMBER: VHB50W
7. OUTPUT TRIMMING (OPTIONAL)
The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may
optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.
To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.
module (VHB50W-Q48-S5) by 8% to 5.4V, R
Table 1. For example, to trim-up the output voltage of 5.0V
Table 1
Where: R
nominal output voltage. V
R
R
1
trim-up
and R
20050 SW 112
FIGURE 4: TRIM-UP VOLTAGE SETUP
trim-up
R
FIGURE 3. TRIMMING WITH
EXTERNAL POTENTIOMETER
The value of R
2
trim-up
are internal to the unit and are defined in
+Vin
-Vin
=
is the external resistor in K Ω . V
V - V
o
3.3V
12V
15V
24V
28V
48V
5V
=
R1 - R2 x (V - V
o, nom = 5.4 - 5.0 = 0.4 V
th
Trim-Up
as follows:
5.8 - 3.3 x 0.4
R1 = 5.8 KΩ
R2 = 3.3 KΩ
Ave. Tualatin, Oregon 97062
o
trim-up
V - V
is the desired output voltage.
0.4
o
Trim
+Vo
-Vo
+S
18.945
25.189
25.189
-S
3.168
608.6
74.25
5.8
is defined as:
o, nom
o
Ω
= 11.2 (KΩ)
o, nom
6.977
173.7
4.636
7.191
13.3
7.2
3.3
trim-up
R trim-up
Ω
o,nom
+Vin
-Vin
)
is calculated
(KΩ)
is the
R load
phone
phone [phone] fax
Trim
+Vo
DESCRIPTION: half-brick dc-dc converter
-Vo
+S
-S
module (VHB50W-Q48-S5) by 8% to 4.6V, R
Where: R
Table 2. For example, to trim-up the output voltage of 5.0V
Table 2
R
nominal output voltage. V
trim-down
R
1
andR
FIGURE 5: TRIM-DOWN VOLTAGE SETUP
trim-down
R
10KΩ
Trimpot
trim-down
The value of R
2
are internal to the unit and are defined in
+Vin
-Vin
fax [phone]
V
=
o, nom
is the external resistor in K Ω . V
3.3V
12V
15V
24V
28V
48V
5V
=
Trim-Down
R load
R1 - R2 x (V
- V
R1 = 5.8 KΩ
R2 = 5.32 KΩ
as follows:
5.8 - 5.32 x 0.4
o
trim-down
o
= 5.0 - 4.6 = 0.4 V
Trim
is the desired output voltage.
V
+Vo
-Vo
0.4
o, nom
+S
-S
86.45
608.6
1638
6.18
150
430
5.8
is defined as:
Ω
o, nom
- V
= 9.18 (KΩ)
173.7
5.32
60.1
120
page
date
306
trim-down
15
68
o
R trim-down
Ω
- V )
06/2009
o,nom
6 of 11
o
is calculated
(KΩ)
is the
R load