1/3
VAT2-SMT Series DC-DC Converter
Rev. 12-2006
Description
Designed to convert fixed volt-
ages into an isolated voltage, the
VAT2-SMT series is well suited for
providing board-mount local sup-
plies in a wide range of applica-
tions, including mixed analog/digi-
tal circuits, test & measurement
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.
Features
·Isolated 2 W output
·Temperature range: -40°C~+85°C
·Unregulated
·High efficiency to 85%
·Dual voltage output
·Small footprint
·SMT package style
·Industry standard pinout
·UL94-V0 package
·No heatsink required
·1K VDC isolation
·High power density
·No external component required
Model
Number
VAT2-S5-D5-SMT
VAT2-S5-D9-SMT
VAT2-S5-D12-SMT
VAT2-S12-D5-SMT
VAT2-S12-D9-SMT
VAT2-S12-D12-SMT
VAT2-S12-D15-SMT
Input Voltage
Nominal
Range
5 Vdc
5 Vdc
5 Vdc
12 Vdc
12 Vdc
12 Vdc
12 Vdc
4.5~5.5 Vdc
4.5~5.5 Vdc
4.5~5.5 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
10.8~13.2 Vdc
Output
Voltage
±5 Vdc
±9 Vdc
±12 Vdc
±5 Vdc
±9 Vdc
±12 Vdc
±15 Vdc
Output Current
Max.
Min.
±200 mA
±111 mA
±83 mA
±200 mA
±111 mA
±83 mA
±67 mA
±10 mA
±11 mA
±8 mA
±10 mA
±11 mA
±8 mA
±6 mA
Efficiency
82%
83%
84%
83%
84%
84%
85%
Package
Style
SMT
SMT
SMT
SMT
SMT
SMT
SMT
Output Specifications
Item
Output power
Line Regulation
Load Regulation
Test conditions
For Vin change of 1%
10% to 100% full load (5V output)
10% to 100% full load (9V output)
10% to 100% full load (12V output)
10% to 100% full load (15V output)
See tolerance envelope graph
100% load
20 MHz Bandwidth
Full load, nominal input
10
6.5
6.0
6.0
Min.
0.2
Typ.
Max.
2
1.2
15
15
15
15
0.03
100
100
200
Units
W
%
%
%
%
%
%/°C
mVp-p
KHz
Output voltage accuracy
Temperature drift
Output ripple
Switching frequency
Note:
1. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless
otherwise specified.
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
2/3
VAT2-SMT Series DC-DC Converter
Rev. 12-2006
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
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.
Isolation Specifications
Item
Isolation Voltage
Insulation Resistance
Test Conditions
Tested for 1 min.
Test at 500 Vdc
Min.
1000
1000
Typ.
Max.
Units
Vdc
MΩ
Typical Characteristics
Ambient Temperature
(
)
Outline Dimensions &
Recommended Layout Pattern
2.54
14 13 12
10 9 8
18.03 12.7
RoHS
5 6 7
1 2 3
1 5.2 4
1 7.7 8
PIN
1
2
3
5
6
7
G ND
Vin
NA
NA
0V
+Vo
14 13 12
10 9 8
PIN
8
9
10
12
13
14
NA
NA
-Vo
NA
NA
NA
1 2 3
5 6 7
Top View
2 .75
6.00 5.75
2 .54
0 .25
2 .74
A
0 .2-0 .3
Side View
Front View
Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm.
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
3/3
VAT2-SMT Series DC-DC Converter
Rev. 12-2006
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.
- 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.
Table 1
Input Voltage
5V
12 V
24 V
External Input Capacitance
4.7 µF
2.2 µF
1.0 µF
- 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.
- 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
Table 2
Vout
5V
9V
12 V
15 V
External Ouput Capacitance
4.7 µF
2.2 µF
1.0 µF
0.47 µF
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.
Vin
G ND
L
L
R
EG
REG
+Vout
DC DC
D D
C C
R
EG
REG
0V
-Vout
+Vout
0V
R
EG
REG
Vin
C
+Vo
C
C
DC DC
<Figure 1>
GND
L
0V
-Vo
Vin
GND
DC DC
D D
C C
<Figure 2>
-Vout
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
Switching Power Supply Study Group
京公网安备 11010802033920号
EEWORLD
