1/3
VEFT1-SMT Single Output Series Dc-Dc Converter
Rev. 12-2005
Description
Designed to convert fixed volt-
ages into an isolated voltage, the
VEFT1-SMT single series is well
suited for providing board-mount
local supplies in a wide range of
applications, including mixed ana-
log/digital circuits, test & meas-
urement equip., process/machine
controls, datacom/telecom fields,
etc...
The semi-regulated output can be
followed by 3-terminal regulators
to provide output protection, in
addition to output regulation.
Model
Number
VEFT1-S3.3-S3.3-SMT
VEFT1-S3.3-S5-SMT
VEFT1-S5-S3.3-SMT
VEFT1-S5-S5-SMT
VEFT1-S5-S9-SMT
VEFT1-S5-S12-SMT
VEFT1-S5-S15-SMT
VEFT1-S5-S24-SMT
VEFT1-S12-S3.3-SMT
VEFT1-S12-S5-SMT
VEFT1-S12-S9-SMT
VEFT1-S12-S12-SMT
VEFT1-S12-S15-SMT
VEFT1-S12-S24-SMT
VEFT1-S15-S3.3-SMT
VEFT1-S15-S5-SMT
VEFT1-S15-S9-SMT
VEFT1-S15-S12-SMT
VEFT1-S15-S15-SMT
VEFT1-S15-S24-SMT
VEFT1-S24-S3.3-SMT
VEFT1-S24-S5-SMT
VEFT1-S24-S9-SMT
VEFT1-S24-S12-SMT
VEFT1-S24-S15-SMT
VEFT1-S24-S24-SMT
Features
·Isolated 1 W output
·Temperature range: -40°C~+85°C
·Unregulated
·High efficiency to 80%
·Single voltage output
·Small footprint
·SMD package style
·Industry standard pinout
·UL94-V0 package
·No heatsink required
·3K Vdc isolation
·Power density 0.85 W/cm³
·No external component required
·Low cost
Output
Voltage
3.3 Vdc
5 Vdc
3.3 Vdc
5 Vdc
9 Vdc
12 Vdc
15 Vdc
24 Vdc
3.3 Vdc
5 Vdc
9 Vdc
12 Vdc
15 Vdc
24 Vdc
3.3 Vdc
5 Vdc
9 Vdc
12 Vdc
15 Vdc
24 Vdc
3.3 Vdc
5 Vdc
9 Vdc
12 Vdc
15 Vdc
24 Vdc
Output Current
Max.
Min.
300 mA
30 mA
200 mA
20 mA
300 mA
30 mA
200 mA
20 mA
111 mA
12 mA
83 mA
9 mA
67 mA
7 mA
42 mA
5 mA
300 mA
200 mA
111 mA
83 mA
67 mA
42 mA
300 mA
200 mA
111 mA
83 mA
67 mA
42 mA
300 mA
200 mA
111 mA
83 mA
67 mA
42 mA
30 mA
20 mA
12 mA
9 mA
7 mA
5 mA
30mA
20 mA
12 mA
9 mA
7 mA
5 mA
30 mA
20 mA
12 mA
9 mA
7 mA
5 mA
Package
Style
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
SMD
Input Voltage
Nominal
Range
3.3 Vdc
3.00~3.60 Vdc
3.3 Vdc
3.00~3.60 Vdc
5 Vdc
4.5~5.5 Vdc
5 Vdc
4.5~5.5 Vdc
5 Vdc
4.5~5.5 Vdc
5 Vdc
4.5~5.5 Vdc
5 Vdc
4.5~5.5 Vdc
5 Vdc
4.5~5.5 Vdc
12 Vdc
12 Vdc
12 Vdc
12 Vdc
12 Vdc
12 Vdc
15
15
15
15
15
15
24
24
24
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
13.5~16.5
13.5~16.5
13.5~16.5
13.5~16.5
13.5~16.5
13.5~16.5
21.6~26.4
21.6~26.4
21.6~26.4
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Efficiency
72%
73%
72%
78%
78%
80%
78%
78%
73%
78%
80%
81%
79%
79%
73%
74%
75%
79%
79%
79%
73%
79%
80%
81%
79%
80%
24 Vdc
24 Vdc
24Vdc
21.6~26.4 Vdc
21.6~26.4 Vdc
21.6~26.4 Vdc
Output Specifications
Item
Output power
Line Regulation
Load Regulation
Output voltage accuracy
Temperature drift
Output ripple
Switching frequency
Test conditions
Min.
0.1
Typ.
Max.
1
1.2%
15%
0.03
75
200K
%/°C
mVp-p
Hz
Units
W
For Vin change of 1%
10% to 100% full load
See tolerance envelope graph
@ 100% load
20 MHz Bandwidth
Full load, nominal input
10%
100K
50
150K
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
2/3
VEFT1-SMT Single Output Series Dc-Dc Converter
Rev. 12-2005
General Specifications
Short circuit protection
Temperature rise at full load
Cooling
Operating temperature range
Storage temperature range
Soldering temperature
Storage humidity range
Case material
MTBF
Burn-in
<1 second
25°C Max, 15°C Typ.
Free air convection
-40°C to +85°C
-55°C to +125°C
300°C (1.5mm from case for 10 sec.)
<95%
Plastic (UL94-V0)
>3,500,000 hrs.
Full load at +85°C, for 4 hours at no-load and 4 hours at full load.
Isolation Specifications
Item
Isolation Voltage
Insulation Resistance
Test Conditions
Tested for 1 min.
Test at 500 Vdc
Min.
3000
1000
Typ.
Max.
Units
Vdc
M
Ω
Note:
1. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless
otherwise specified.
Typical Characteristics
Outline Dimensions &
Recommended Layout Pattern
Side View
15.24
6.0
1.85MA X
7.0
6.7 0
Ａ
0.50
1.50
1.20
Ａ
0.3
5.00
Top View
15.24
7.62
Pin
1
2
3
5
6
GND
Vin
NC
COM
NC
1 2 11 1 0
8 7
Pin
7
8
10
11
12
NC
+Vo
NC
NC
NC
11.2
7.5
MAX
1 2 3
5 6
Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm.
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
3/3
VEFT1-SMT Single Output Series Dc-Dc Converter
Rev. 12-2005
Application Notes:
- Input filtering
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 filtering is required, the
capacitance may be increased, or expanded to an LC
network as shown in Figure 1.
- Minimum loading
The converter needs a minimum of 10% loading to
maintain output regulation. Operation under no-load
conditions will not cause immediate 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 voltage. If regulated
output is needed, an external regulator can be used
as shown in Figure 2.
Table 1
Input Voltage
5V
12 V
15 V
24 V
- Output filtering
An output capacitor is needed to meet output ripple
requirements as shown in Table 2.
Output capacitance may be increased for additional
filtering, but should not exeed 10µF or expanded to
an LC network as in Figure 1.
External Input Capacitance
4.7 µF
2.2 µF
2.2 µF
1.0 µF
- 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.
- 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 regulator, 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.
Table 2
Vout
5V
9V
12 V
15 V
24 V
External Ouput Capacitance
10 µF
4.7 µF
Vin
REG
+Vout
2.2 µF
GND
ＤＣ ＤＣ
COM
+Vout
REG
1 µF
0.47 µF
Vin
ＤＣ ＤＣ
GND
COM
Ｌ
Ｌ
Vin
Ｃ
+Vout
Ｃ
ＤＣ ＤＣ
<Figure 1>
GND
COM
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
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