date
page
10/31/2012
1 of 5
SERIES:
VAT0.25-SMT
│
DESCRIPTION:
DC-DC CONVERTER
FEATURES
• 0.25 W isolated output
• industry standard 10 pin SMT package
•
•
•
•
•
•
dual unregulated outputs
1,000 V isolation
short circuit protection
UL safety approvals (some models)
wide temperature (-40~85°C)
efficiency up to 67%
RoHS
MODEL
VAT0.25-S5-D5-SMT
VAT0.25-S5-D5-SMT
VAT0.25-S5-D9-SMT
VAT0.25-S5-D12-SMT
VAT0.25-S5-D15-SMT
VAT0.25-S12-D5-SMT
VAT0.25-S12-D9-SMT
VAT0.25-S12-D12-SMT
VAT0.25-S12-D15-SMT
VAT0.25-S24-D5-SMT
VAT0.25-S24-D9-SMT
VAT0.25-S24-D12-SMT
VAT0.25-S24-D15-SMT
Notes:
input
voltage
typ
(Vdc)
range
(Vdc)
output
voltage
(Vdc)
output
current
min
(mA)
max
(mA)
output
power
max
(W)
ripple
1
max
(mVp-p)
noise
1
max
(mVp-p)
efficiency
typ
(%)
5
5
5
5
5
12
12
12
12
24
24
24
24
4.5~5.5
4.5~5.5
4.5~5.5
4.5~5.5
4.5~5.5
10.8~13.2
10.8~13.2
10.8~13.2
10.8~13.2
21.6~26.4
21.6~26.4
21.6~26.4
21.6~26.4
±3.3
±5
±9
±12
±15
±5
±9
±12
±15
±5
±9
±12
±15
±4
±3
±2
±2
±1
±3
±2
±2
±1
±3
±2
±2
±1
±38
±25
±14
±11
±9
±25
±14
±11
±9
±25
±14
±11
±9
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
75
75
75
75
75
75
75
75
75
75
75
75
75
150
150
150
150
150
150
150
150
150
150
150
150
150
62
64
65
67
66
65
64
63
64
61
62
63
65
1. ripple and noise are measured at 20 MHz BW
2. unbalanced load: ±5%
PART NUMBER KEY
VAT0.25 - SXX - DXX -SMT-
X
Base Number
Input Voltage
Output Voltage
Packaging Style
Package Options
"blank" = standard
TR = Tape & Reel
cui.com
CUI Inc
│
SERIES:
VAT0.25-SMT
│
DESCRIPTION:
DC-DC CONVERTER
date
10/31/2012
│
page
2 of 5
INPUT
parameter
operating input voltage
conditions/description
5 V model
12 V model
24 V model
min
4.5
10.8
21.6
typ
5
12
24
max
5.5
13.2
26.4
units
Vdc
Vdc
Vdc
OUTPUT
parameter
line regulation
conditions/description
for Vin change of 1%
measured from 10% load to full load
3.3 V model
5 V model
9 V model
12 V model
15 V model
see derating curves
100% load, 5 and 12 V input
100% load, 24 V input
150
700
±0.03
kHz
kHz
%/°C
15
10
6.5
6.0
6.0
min
typ
max
1.2
20
15
15
15
15
units
%
%
%
%
%
%
load regulation
voltage accuracy
switching frequency
temperature coefficient
Notes:
1. test ripple and noise by “parallel cable” method.
PROTECTIONS
parameter
short circuit protection
conditions/description
min
typ
max
1
units
s
SAFETY AND COMPLIANCE
parameter
isolation voltage
isolation resistance
safety approvals
MTBF
RoHS compliant
yes
conditions/description
for 1 minute at 1 mA max.
at 500 Vdc
UL 60950-1 (E222736)
3,500,000
hours
min
1,000
1,000
typ
max
units
Vdc
MΩ
ENVIRONMENTAL
parameter
operating temperature
storage temperature
storage humidity
temperature rise
lead temperature
non-condensing
at full load
1.5 mm from case for 10 seconds
15
conditions/description
min
-40
-55
typ
max
85
125
95
25
260
units
°C
°C
%
°C
°C
cui.com
CUI Inc
│
SERIES:
VAT0.25-SMT
│
DESCRIPTION:
DC-DC CONVERTER
date
10/31/2012
│
page
3 of 5
DERATING CURVES
1. output power vs. ambient temperature
+10%
100
80
60
40
20
+5%
Nominal
Voltage
+2.5%
-2.5%
-7.5%
2. output voltage vs. output current
-40
-20
0
20
40
60
Output Voltate (%)
Load (%)
85
105 120
10%
50%
100%
Ambient Temperature (°C)
Output Current (%)
MECHANICAL
parameter
dimensions
case material
weight
conditions/description
0.600 x 0.441 x 0.250 (15.24 x 11.22 x 6.50 mm)
plastic (UL94-V0)
1.70
g
min
typ
max
units
inch
MECHANICAL DRAWING
units: mm (inches)
tolerance: ±0.15 (±0.006)
pin section tolerance: ±0.10 mm (±0.004)
6.76
[0.2 7]
[ 0.17]
4.25
A
0.50
[0.0 2]
[0.26]
[0.25 ]
6.50
6.25
(Side View)
1.35MAX
[ 0.06]
5.00
"
[ 0.0 1]
0.25
[ 0.07]
1.85MAX
7.15
[ 0.2 8]
[0.01]
0.3
15.24
[0.6 ]
10.16
[ 0.4]
11.2 MAX
PIN CONNECTIONS
PIN
FUNCTION
GND
+Vin
0V
-Vo
NC
+Vo
NC
NC
NC
1
2
4
10 9 8
7 6
[0.44]
[ 0.30]
7.50
5
(Top View)
6
7
8
2.54
0.1
[ 0.1 0.004]
0.6 0.05
[ 0.02
0.00 2]
9
1 2
3
4
5
10
cui.com
CUI Inc
│
SERIES:
VAT0.25-SMT
│
DESCRIPTION:
DC-DC CONVERTER
date
10/31/2012
│
page
4 of 5
APPLICATION NOTES
1.
Requirement on Output Load
In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded and the
minimum output load is not less than 10% load. If the actual load is less than the specified minimum load, the output ripple may
increase sharply while its efficiency and reliability will reduce greatly. If the actual output power is very small, please add an
appropriate resistor as extra loading.
Overload Protection
Under normal operating conditions, the output circuit of these products has no protection against over-current and short-circuits. The
simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit.
Filtering
In some circuits which are sensitive to noise and ripple, a
fi
ltering capacitor may be added to the DC/DC output end and input end to
reduce the noise and ripple. However, the capacitance of the output
fi
lter capacitor must be proper. If the capacitance is too big, a
startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest
capacitance of its
fi
lter capacitor sees the external capacitor table. To get an extremely low ripple, an “LC”
fi
ltering network may be
connected to the input and output ends of the DC/DC converter, which may produce a more significant
fi
ltering effect. It should also
be noted that the inductance and the frequency of the “LC”
fi
ltering network should be staggered with the DC/DC frequency to avoid
mutual interference (Figure 1).
L
L
2.
3.
Figure 1
+Vin
C
+Vout
C
-Vin
DC DC
L
Com
C
-Vout
4.
Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat
protection that is connected to the input or output end in series (Figure 2).
+Vin
REG
+Vout
Figure 2
-Vin
DC DC
Com
-Vout
250
Peak Temperature
260°C for 10 Sec. Max
90 Sec. max
(>220°C)
220°C
200
Temperature (°C)
150
100
50
0
Time (Seconds)
cui.com
CUI Inc
│
SERIES:
VAT0.25-SMT
│
DESCRIPTION:
DC-DC CONVERTER
date
10/31/2012
│
page
5 of 5
REVISION HISTORY
rev.
1.0
1.01
1.02
description
initial release
new template applied, V-Infinity branding removed
added TR package option
date
02/19/2008
09/06/2012
10/31/2012
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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