Datasheet

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date
07/01/2013
page
1 of 5
SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER
1 W isolated output
industry standard 12 pin SMT package
dual unregulated outputs
3,000 V isolation
short circuit protection
UL safety approvals (some models)
wide temperature (-40~85°C)
efficiency up to 80%
U
•
•
•
•
•
•
•
•
ED
FEATURES
MODEL
input
voltage
typ
(Vdc)
output
voltage
range
(Vdc)
(Vdc)
N
RoHS
output
current
output
power
ripple
and noise1
efficiency
min
(mA)
max
(mA)
max
(W)
max
(mVp-p)
typ
(%)
5
4.5~5.5
±12
±5
±42
1
75
78
VEFT1-S12-D9-SMT
12
10.8~13.2
±9
±6
±56
1
75
76
VEFT1-S12-D12-SMT
12
10.8~13.2
±12
±5
±42
1
75
78
VEFT1-S12-D15-SMT
12
10.8~13.2
±15
±4
±33
1
75
79
VEFT1-S24-D5-SMT
24
21.6~26.4
±5
±10
±100
1
75
79
VEFT1-S24-D9-SMT
24
21.6~26.4
±9
±6
±56
1
75
80
VEFT1-S24-D12-SMT
24
21.6~26.4
±12
±5
±42
1
75
80
VEFT1-S24-D15-SMT
24
21.6~26.4
±15
±4
±33
1
75
80
N
1. ripple and noise are measured at 20 MHz BW
O
Notes:
TI
VEFT1-S5-D12-SMT
IS
C
PART NUMBER KEY
VEFT1 - SXX - DXX -SMT - X
Base Number
Output Voltage
Packaging Style
D
Input Voltage
cui.com
Package Options
"blank" = standard
TR = Tape & Reel
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CUI Inc │ SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER
date 07/01/2013 │ 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%
±1.2
%
15
10
10
10
%
%
%
%
OUTPUT
load regulation
measured from 10%
load to full load
voltage accuracy
see derating curves
switching frequency
100% load, 5 and 12 V input
100% load, 24 V input
parameter
conditions/description
SAFETY AND COMPLIANCE
kHz
kHz
±0.03
%/°C
min
TI
short circuit protection
100
500
N
temperature coefficient
PROTECTIONS
12.8
8.3
6.8
6.3
U
5 V model
9 V model
12 V model
15 V model
ED
parameter
units
1
s
max
units
conditions/description
for 1 minute at 1 mA max.
3,000
Vdc
isolation resistance
at 500 Vdc
1,000
MΩ
safety approvals1
UL
3,500,000
hours
Notes:
yes
N
parameter
MTBF
typ
max
isolation voltage
RoHS compliant
min
typ
1. VEFT1-S5-D12 and VEFT1-S12-D9/12/15 only
parameter
operating temperature
conditions/description
IS
C
storage temperature
O
ENVIRONMENTAL
non-condensing
at full load
reflow soldering
see reflow soldering profile
200
max
units
-40
85
°C
-55
125
°C
Peak Temperature
260°C for 10 Sec. Max
90 Sec. max
(>220°C)
150
100
50
0
typ
15
250
Temperature (°C)
D
storage humidity
temperature rise
min
Time (Seconds)
cui.com
220°C
95
%
25
°C
260
°C
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CUI Inc │ SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER
date 07/01/2013 │ page 3 of 5
DERATING CURVES
2. output voltage vs. output current
ED
1. output power vs. ambient temperature
+10%
Output Voltate (%)
Load (%)
100
80
60
40
20
-20
0
20
40
60
85
105 120
-7.5%
N
parameter
conditions/description
dimensions
15.24 x 11.20 x 6.50 (0.600 x 0.441 x 0.256 inch)
case material
plastic (UL94-V0)
min
TI
weight
MECHANICAL DRAWING
O
N
units: mm [inches]
tolerance: ±0.25 [±0.010]
pin section tolerance: ±0.10 mm [±0.004]
6.25 [0.246]
D
8
7
3
5
6
2.54 [0.100]
3
5
6
2.10 [0.083]
Top View
PCB Layout
PIN CONNECTIONS
A
0.25 [0.010]
A
1.35 [0.053]
g
2.54 [0.100]
Top View
8.50 [0.335]
1.71
7
2
5°max
cui.com
units
mm
8
1
11.20 [0.441]
1 2
max
12 11 10
15.24 [0.600]
12.70 [0.500]
2.54 [0.100]
12 11 10
typ
1.00 [0.039]
0.60 [0.024]
7.50 [0.295]
100%
10.10 [0.398]
IS
C
Front View
50%
Output Current (%)
MECHANICAL
0.25 [0.010]
-2.5%
10%
Ambient Temperature (°C)
6.50 [0.256]
+2.5%
Voltage
U
-40
+5%
Nominal
PIN
FUNCTION
1
GND
2
+Vin
5
0V
6
-Vo
8
+Vo
others
NC
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CUI Inc │ SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER
date 07/01/2013 │ page 4 of 5
APPLICATION NOTES
ED
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.
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.
L
DC DC
Cin
Cout
0V
L Cout
-Vo
TI
GND
+Vo
N
Figure 1
L
Vin
U
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).
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).
R EG
N
Vi n
GND
O
Figure 2
REG
+Vout
REG
-Vout
DC DC
0V
IS
C
5. External Capacitor Table
It is not recommended to connect any external capacitor in the application field with less than 0.5 W output.
Cin
(µF)
Vout
(Vdc)
Cout
(µF)
5
4.7
±5
4.7
12
2.2
±9
2.2
24
1
±12
1
--
--
±15
1
D
Table 1
Vin
(Vdc)
Note:
All specifications measured at 25°C, humidity <75%, nominal input voltage, and full load unless otherwise noted.
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CUI Inc │ SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER
date 07/01/2013 │ page 5 of 5
REVISION HISTORY
rev.
description
date
04/09/2009
initial release
new template applied
1.02
V-Infinity branding removed
1.03
added TR package option
1.04
discontinued VEFT1-S5-D5-SMT, VEFT1-S5-D9-SMT, VEFT1-S5-D15SMT, and VEFT1-S12-D5-SMT models
ED
1.0
1.01
04/12/2012
09/05/2012
11/01/2012
07/01/2013
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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