CUI Inc
│
SERIES:
VGDS1-SIP
│
DESCRIPTION:
DC-DC CONVERTER
date
09/07/2012
│
page
3 of 5
DERATING CURVES
0
0
60
40
0
-40
-20
0
20
40
60
85
100
120
Ambient Temperature (°C)
MECHANICAL
parameter
dimensions
case material
weight
conditions/description
0.768 x 0.386 x 0.492 (19.5 x 9.80 x 12.5 mm)
plastic (UL94-V0)
4.3
g
min
typ
max
units
inch
MECHANICAL DRAWING
units: mm
tolerance: ±0.25
pin section tolerance: ±0.10 mm
(Side View)
First Angle Projection
RECOMMENDED FOO TPRINT
Top
view,grid:2.54 mm(0.1inch)
diame ter:1.00mm(0.039inch)
19.50[0.768]
12.50
[0.492]
[0.161 ]
0.50
[0.020]
[0.100]
2.54
4.10
1 2
5 6 7
(Bo tto m View)
PIN CONNECTIONS
9.80
[0.386]
2.40
[0.094]
PIN
1
2
5
FUNCTION
+Vin
-Vin
-Vo
COM
+Vo
1 2
5 6
7
2.00[0.079]
6
7
cui.com
CUI Inc
│
SERIES:
VGDS1-SIP
│
DESCRIPTION:
DC-DC CONVERTER
date
09/07/2012
│
page
4 of 5
APPLICATION NOTES
1.
Input
fi
ltering
To reduce the reflected ripple current and minimize EMI, especially when the converter input is more than 2” away from the DC
source, it is recommended to connect a low ESR electrolytic capacitor between Vin and Gnd. The values suggested are as shown in
Table 1. If additional
fi
ltering is required, the capacitance may be increased, or expanded to an LC network as shown in Figure 1.
External Input
Capacitance
4.7
μF
2.2
μF
2.2
μF
1.0
μF
-Vin
L
+Vin
C
Input Voltage
Table 1
5V
12 V
15 V
24 V
L
+Vout
C
COM
-Vout
C
DC DC
Figure 1
L
2.
Output
fi
ltering
An output capacitor is needed to meet output ripple requirements as shown in Table 2. Output capacitance may be increased for ad-
ditional
fi
ltering, but should not exeed 10μF or expanded to an LC network as in Figure 1.
+Vin
-Vin
REG
+Vout
Output Voltage
5V
Table 2
9V
12 V
15 V
24 V
External Input
Capacitance
4.7
μF
2.2
μF
1.0
μF
0.47
μF
0.33
μF
DC DC
REG
COM
-Vout
+Vout
+Vin
DC DC
-Vin
REG
COM
-Vout
Figure 2
3.
Minimum loading
The converter needs a minimum of 10% loading to maintain output regulation. Operation under no-load conditions will not cause im-
mediate damages but may reduce reliability, and cause performance not to meet specifications.
Regulation
With a semi-regulated design, the converter’s output voltage varies with load current and will change proportionally to the input volt-
age. If regulated output is needed, an external regulator can be used as shown in Figure 2.
Protection
The converter has minimal protection against input over-voltage or output over-load, and may be permanently damaged if exposed to
these conditions. An input clamping device can be used for input voltage limiting. An input fuse or an output fuse can also be used to
protect against over-loading.
Dual outputs used as a single output
The +Vout and -Vout can be used to obtain a single output that is the sum of the two outputs. In this case, the COM pin shouldn’t be
used.
External Regulator
An external 3-terminal regulator can be connected to the output of the converter to achieve full regulation. Make sure the converter’s
output voltage provides sufficient head room for the regulator. An additional benefit is that the built-in protection features in the regu-
lator, such as OCP, OTP, etc, will protect the converter also. In a complimentory supply, a negative output regulator must be used to
achieve the negative regulated output.
4.
5.
6.
7.
cui.com
CUI Inc
│
SERIES:
VGDS1-SIP
│
DESCRIPTION:
DC-DC CONVERTER
date
09/07/2012
│
page
5 of 5
REVISION HISTORY
rev.
1.0
1.01
description
initial release
new template applied, V-Infinity branding removed
date
06/20/2006
09/07/2012
The revision history provided is for informational purposes only and is believed to be accurate.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
Fax 503.612.2383
cui.com
techsupport@cui.com
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to
affect its safety or effectiveness.
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