Datasheet

For more information, please visit the product page.
date
11/01/2012
page
1 of 5
SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER
0.25 W isolated output
industry standard 8 pin SMT package
single unregulated output from 3.3~48 V
1,000 V isolation
short circuit protection
efficiency up to 65%
U
•
•
•
•
•
•
ED
FEATURES
RoHS
typ
(Vdc)
output
voltage
range
(Vdc)
(Vdc)
5
4.5~5.5
3.3
VBT0.25-S5-S5-SMT
5
4.5~5.5
5
min
(mA)
max
(mA)
output
power
ripple and
noise1
efficiency
max
(W)
max
(mVp-p)
typ
(%)
8
76
0.25
100
62
5
50
0.25
100
64
TI
VBT0.25-S5-S3.3-SMT
output
current
N
input
voltage
MODEL
VBT0.25-S5-S9-SMT
5
4.5~5.5
9
3
28
0.25
100
65
VBT0.25-S5-S12-SMT
5
4.5~5.5
12
2
21
0.25
100
67
5
4.5~5.5
15
2
17
0.25
100
66
12
10.8~13.2
5
5
50
0.25
100
65
VBT0.25-S12-S9-SMT
12
10.8~13.2
9
3
28
0.25
100
64
VBT0.25-S12-S12-SMT
12
10.8~13.2
12
2
21
0.25
100
63
VBT0.25-S12-S15-SMT
12
10.8~13.2
15
2
17
0.25
100
64
VBT0.25-S24-S5-SMT
24
21.6~26.4
5
5
50
0.25
100
60
VBT0.25-S24-S9-SMT
24
VBT0.25-S24-S15-SMT
9
3
28
0.25
100
61
21.6~26.4
12
2
21
0.25
100
63
24
21.6~26.4
15
2
17
0.25
100
65
1. 20 MHz bandwidth oscilloscope
2. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specified.
IS
C
Notes:
21.6~26.4
24
O
VBT0.25-S24-S12-SMT
N
VBT0.25-S5-S15-SMT
VBT0.25-S12-S5-SMT
D
PART NUMBER KEY
VBXT0.25 - SXX - SXX -SMT- X
Output Voltage
Base Number
X indicates ALT PIN
configuration, see page 3
Input Voltage
Packaging Style
cui.com
Package Options
"blank" = standard
TR = Tape & Reel
For more information, please visit the product page.
CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER
date 11/01/2012 │ page 2 of 5
INPUT
conditions/description
min
typ
max
units
operating input voltage
5 V model
12 V model
24 V model
4.5
10.8
21.6
5
12
24
5.5
13.2
26.4
Vdc
Vdc
Vdc
parameter
conditions/description
min
typ
max
units
line regulation
for Vin change of 1%
3.3 V model
all other models
1.5
1.2
%
%
load regulation
measured from 10%
load to full load
3.3 V model
5 V model
9 V model
12 V model
15 V model
20
15
15
15
15
%
%
%
%
%
OUTPUT
switching frequency
temperature coefficient
TI
PROTECTIONS
parameter
conditions/description
short circuit protection
SAFETY AND COMPLIANCE
U
see derating curves
100% load, 5 and 12 V input
100% load, 24 V input
15
12.8
8.3
6.8
6.3
N
voltage accuracy
ED
parameter
min
kHz
kHz
±0.03
%/°C
typ
units
1
s
max
units
for 1 minute at 1 mA max.
1,000
Vdc
isolation resistance
at 500 Vdc
1,000
MΩ
safety approvals
UL 60950-1 (E222736)
3,500,000
hours
N
conditions/description
isolation voltage
O
MTBF
typ
max
parameter
RoHS compliant
min
110
700
yes
IS
C
ENVIRONMENTAL
parameter
conditions/description
min
typ
max
units
operating temperature
-40
85
°C
storage temperature
-55
125
°C
storage humidity
non-condensing
temperature rise
at full load
lead temperature
1.5 mm from case for 10 seconds
D
15
cui.com
95
%
25
°C
260
°C
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CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER
date 11/01/2012 │ page 3 of 5
DERATING CURVES
80
60
40
20
-40
-20
0
20
40
60
85
105
U
Ambient Temperature (°C)
MECHANICAL
conditions/description
dimensions
0.500 x 0.441 x 0.246 (12.70 x 11.20 x 6.25 mm)
case material
plastic (UL94-V0)
N
4.13
[0.163]
6.25
[0.246]
6.00
[0.236]
O
7.50
[0.295]
inch
1.35
g
Top view,grid:2.54mm(0.1inch)
VBXT0.25-SMT
VBT0.25-SMT
12.70 [0.500]
7.62
[0.300]
11.2 MAX
[0.441]
units
R EC OM MEND ED F OO TPRIN T
(Side view)
IS
C
D
max
First Angle Projection
2.54
0.25
[0.100] [0.100]
8 7 6 5
8
5
1 2 3 4
1 2
4
(Top view)
2.54f0.1
[0.100 f0.004]
A
7.19
[0.283]
PIN CONNECTIONS
0.6f0.05
[0.024f0.002]
6.76
[0.266]
1.85MAX
[0.073]
typ
TI
weight
units: mm [inches]
tolerance: ±0.15 [±0.006]
pin section tolerance: ±0.10 [±0.004]
min
N
parameter
MECHANICAL DRAWING
ED
Load (%)
100
A
0.50 [0.020]
1.35MAX
[0.053]
5.00
0.3
[0.012]
cui.com
Ⱦ
PIN
FUNCTION
ALT FUNCTION
1
GND
GND
2
+Vin
+Vin
3
NC
No PIN
4
0V
0V
5
+Vo
+Vo
6
NC
No PIN
7
NC
No PIN
8
NC
NC
For more information, please visit the product page.
CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER
date 11/01/2012 │ page 4 of 5
APPLICATION NOTES
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.
2.
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.
3.
Filtering
In some circuits which are sensitive to noise and ripple, a filtering 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 filter 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 filter capacitor sees the external capacitor table. To get an extremely low ripple, an “LC” filtering network may be
connected to the input and output ends of the DC/DC converter, which may produce a more significant filtering effect. It should also
be noted that the inductance and the frequency of the “LC” filtering network should be staggered with the DC/DC frequency to avoid
mutual interference (Figure 1).
L
Figure 1
+Vin
Cin
-Vin
L
DC DC
+Vout
Cout
TI
-Vout
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).
DC DC
-Vin
O
Figure 2
+Vin
-Vout
REG
+Vout
DC DC
-Vin
-Vout
Reflow Profile
Peak Temperature
260°C for 10 Sec. Max
250
200
Temperature (°C)
D
+Vout
REG
N
+Vin
IS
C
4.
N
U
ED
1.
90 Sec. max
(>220°C)
150
100
50
0
Time (Seconds)
cui.com
220°C
For more information, please visit the product page.
CUI Inc │ SERIES: VBT0.25-SMT │ DESCRIPTION: DC-DC CONVERTER
date 11/01/2012 │ page 5 of 5
REVISION HISTORY
description
date
03/06/2008
1.0
initial release
1.01
new template applied, V-Infinity branding removed
1.02
added TR package option
ED
rev.
09/07/2012
11/01/2012
D
IS
C
O
N
TI
N
U
The revision history provided is for informational purposes only and is believed to be accurate.
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20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
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[email protected]
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
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CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical
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