INNOVATION and EX C ELL E N C E
Dual Output
BST Models
+ V
I N
V
I N
+ V
O U T
V
O U T
C O M M O N
R E F E R E N C E &
E R R O R A M P
O P T O
I S O L A T I O N
P W M
C O N T R O L L E R
Figure 1. Simplified Schematic
Low-Cost, High-Reliability
3 Watt, DC/DC Converters
Features
Lowest cost! Highest reliability!
100% SMT-on-pcb, including magnetics
100% automatically assembled
Standard "DIP" package and pinouts
Fully isolated, 1000Vdc guaranteed
5, 12 or 15 Volt outputs
Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts
Guaranteed efficiencies to 75%
40 to +75C full-power operation
Internal input/output filtering
UL1950/C22.2 No. 950/IEC950 certified
Modifications and customs for OEM's
DATEL, Inc., Mansfield, MA 02048 (USA)
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
Email: sales@datel.com
Internet: www.datel.com
Rarely, has a Series of low-power DC/DC converters been defined by both low
cost and DATEL's made-in-the-USA quality and reliability. Our new BST Series of
dual-output 3W DC/DC's achieves this "best-of-both-worlds" status by implementing
a proven circuit architecture (170-200kHz flyback design) as a full, SMT-on-pcb
assembly (including surface-mount magnetics) that is truly 100% automatically
assembled. Packaged in miniature 1.25" x 0.8", DIP-like plastic packages (UL94V-0
rated) and requiring no external components, BST Series DC/DC's bring true
component-like convenience to designers of today's distributed power systems.
Output voltages are 5, 12 or 15 Volts. Input voltage ranges are 4.5-9V
("D5" models), 9-18V ("D12" models) or an ultra-wide 18-72V ("D48" models). BST
DC/DC's are fully isolated (1000Vdc guaranteed) and include input (pi type) and
output filters within their package. Output transient response is a quick 200sec,
while output ripple and noise are typically 75mVp-p.
These rugged modules are fully encapsulated with a thermally conductive
potting compound that contributes to their outstanding moisture/vibration resistance
and impressive MTBF. They operate over the full 40 to +75C temperature range
without derating. All models have been thoroughly characterized (electrically,
mechanically and thermally), qualified (including HALT), and EMI/EMC tested.
Additionally, they are certified to UL1950, CSA 22.2 No. 950 and IEC950.
DATEL's BST Model 3W DC/DC's are excellent selections for telecom/datacom,
computer and process-control applications demanding small size, low cost and high
reliability. If required, their design "flexibility" allows for easy modification to your
application-specific requirements.
0.020 0.002 DIA.
(0.508 0.051)
0.15 MIN
(3.81)
0.45
(11.43)
1.25
(31.75)
0.200
(5.08)
0.10
(2.54)
0.80
(20.32)
0.600
(15.24)
0.100
(2.54)
0.18
(4.57)
STANDOFFS
0.025
(0.64)
0.600
(15.24)
BOTTOM VIEW
1 2
3 4
5
6
8
7
PLASTIC CASE WITH AN INSULATED BASE
XST Series
3 W , D U A L O U T P U T D C / D C C O N V E R T E R S
2
Mechanical Specifications
Typical at T
A
= +25C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
Balanced loads, 10% to 100% load.
Nominal line voltage, no-load/full-load conditions.
BST-5/250-D12
5
250
75
120
0.5%
0.5%
12
9-18
25/267
75%
78%
C1, P2
BST-5/250-D48
5
250
75
120
0.5%
0.5%
48
18-72
7/69
72%
76%
C1, P2
BST-12/105-D5
12
105
75
150
0.5%
0.5%
5
4.5-9
60/690
71%
73%
C1, P2
BST-12/125-D12
12
125
75
150
0.5%
0.5%
12
9-18
25/329
74%
76%
C1, P2
BST-12/125-D48
12
125
75
150
0.5%
0.5%
48
18-72
8/81
73%
77%
C1, P2
BST-15/85-D5
15
85
75
150
0.5%
0.5%
5
4.5-9
68/689
72%
74%
C1, P2
BST-15/100-D12
15
100
75
150
0.5%
0.5%
12
9-18
25/329
74%
76%
C1, P2
BST-15/100-D48
15
100
75
150
0.5%
0.5%
48
18-72
8/81
73%
77%
C1, P2
Performance Specifications and Ordering Guide
R/N (mVp-p)
Load
V
OUT
(Volts)
Output
Package
(Case,
Pinout)
Efficiency
Regulation (Max.)
Line
V
IN
Nom.
(Volts)
Range
(Volts)
Model
Input
I
IN
(mA)
Max.
Typ.
Typ.
Min.
I
OUT
(mA, Max.)
P A R T N U M B E R S T R U C T U R E
M E C H A N I C A L S P E C I F I C A T I O N S
Input Voltage Range:
D5
= 4.5-9 Volts (5V nominal)
D12
= 9-18 Volts (12V nominal)
D48
= 18-72 Volts (48V nominal)
Nominal Output Voltages:
5, 12 or 15 Volts
Maximum Output Current
in mA from each output
Product Series
Output Configuration:
B
= Bipolar
15
B ST
100
D48
-
/
-
Case C1
Pin
1
2
3
4
5
6
7
8
I/O Connectiions
Function P2
+Input
+Input
Input
Input
Common
+Output
Common
Output
Output P
o
wer (W
atts)
Ambient Temperature (
C)
40
0
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95 100
3.5
3
2.5
2
1.5
1
0.5
0
Output Power vs. Ambient Temperature
V
IN
Nominal, Natural Convection
T E M P E R A T U R E D E R A T I N G
BST Models
3 W , D U A L O U T P U T D C / D C C O N V E R T E R S
3
Performance/Functional Specifications
Typical @ T
A
= +25C under nominal line voltage and full-load conditions unless noted.
T E C H N I C A L N O T E S
These power converters require a minimum 10% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices; however they may not
meet all listed specifications.
Application-specific internal input/output filtering can be recommended and perhaps added
internally upon request. Contact DATEL Applications Engineering for details.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
Input
Input Voltage Range:
"D5" Models
4.5-9 Volts (5V nominal)
"D12" Models
9-18 Volts (12V nominal)
"D48" Models
18-72 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type
Pi
Reverse-Polarity Protection
Yes (Instantaneous, 2A maximum)
Output
V
OUT
Accuracy
(50% load)
1%, maximum
Temperature Coefficient
0.02% per C
Ripple/Noise
(20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage
1000Vdc, minimum
Current Limiting:
"D5" Models
Power-limiting technique, auto-recovery
"D12" and "D48" Models
Hiccup technique, auto-recovery
Dynamic Characteristics
Transient Response
(50% load step)
200sec to 1.5% of final value
Switching Frequency:
"D48" Models
200kHz
"D5" and "D12" Models
170kHz
Environmental
Operating Temperature
(Ambient, no derating)
40 to +75C
Storage Temperature
40 to +100C
Physical
Dimensions
1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Case Material
Diallyl phthalate, UL94V-0 rated
Pin Material
Brass, solder coated
Weight
0.5 ounces (14.2 grams)
Input Voltage:
"D5" Models
12 Volts
"D12" Models
20 Volts
"D48" Models
80 Volts
Input Reverse-Polarity Protection
Current must be <2A. Brief duration
only. Fusing recommended.
Output Overvoltage Protection
None
Output Current
Current limited. Max. current and
short-circuit duration are model
dependent. "D12" and "D48" models
can withstand sustained output short
circuits.
Storage Temperature
40 to +100C
Lead Temperature
(soldering, 10 sec.)
+300C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied.
Absolute Maximum Ratings
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating." Any
BST model may be configured to produce an output of 10V, 24V or 30V (for
5V, 12V or 15V models, respectively) by applying the load across the
+Output (pin 6) and Output (pin 8), with either output grounded. The
Common (pins 5 and 7) should be left open. Minimum 20% loading is
recommended under these conditions.
Filtering and Noise Reduction
All BST 3 Watt DC/DC Converters achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In critical
applications, input/output ripple and noise may be further reduced by
installing electrolytic capacitors across the input terminals and/or low-ESR
tantalum or electrolytic capacitors across the output terminals. Output
capacitors should be connected between their respective output pin (pins 6
and 8) and Common (pins 5 and 7) as shown in Figure 2. The caps should
be located as close to the power converters as possible. Typical values are
listed in the tables below. In many applications, using values greater than
those listed will yield better results.
To Reduce Input Ripple
"D5" Models
47F, 15V
"D12" Models
10F, 35V
"D48" Models
4.7F, 100V
To Reduce Output Ripple
5V Outputs
47F, 10V, Low ESR
12/15V Outputs
22F, 20V, Low ESR
In critical, space-sensitive applications, DATEL may be able to tailor the
internal input/output filtering of these units to meet your specific require-
ments. Contact our Applications Engineering Group for additional details.
Figure 2. Using External Capacitors to Reduce
Input/Output Ripple/Noise
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL BST
3 Watt DC/DC Converters, you should use slow-blow type fuses with values
no greater than the following:
V
IN
Range
Fuse Value
"D5"
1.5A
"D12"
1A
"D48"
0.5A
DATEL's world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for your
demanding, large volume, OEM applications. And ... we'll do it on time and
within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design and
deliver any quantity of power converters to the highest standards of quality
and reliability.
We have compiled a large library of DC/DC designs that are currently used in
a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effective
power converters available.
XST Series
3 W , D U A L O U T P U T D C / D C C O N V E R T E R S
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH Mnchen, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com Email: sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DS-0443 6/01
C U S T O M C A P A B I L I T I E S
INNOVATION and EX C ELL E N C E
ISO-9001 REGISTERED
+INPUT
+OUTPUT
OUTPUT
COMMON
INPUT
1, 2
5, 7
3, 4
6
8
C
IN
C
C
OUT
OUT
+
+
+
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