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OBS SERIES - 25 WATT
DESCRIPTION
OBS single output DC/DC converters provide up to 25
Watts of output power in an industry standard package
and footprint. The OBS units feature excellent efficiency,
six-sided shielding, and fixed switching frequency. With
100°C case operation, the OBS converters are especially
suited to telecom, networking, and industrial
applications. These units are 100% surface-mount
construction and fully compatible with production board
washing processes.
FEATURES
• Industry Standard Package
• 24 and 48V Input
Versions
• 25W Output Power
• 100°C Baseplate
Operation
•
•
•
•
Trim And Enable Pins
Fixed Frequency
1500V Isolation
6-Sided Shielding
Efficiency vs. Load (24V Input)
95
90
EFFICIENCY %
TECHNICAL SPECIFICATIONS
Input
Voltage Range
24 VDC Nominal
48 VDC Nominal
Reflected Ripple
Input Reverse Voltage Protection
Output
Setpoint Accuracy
Line Regulation V
in
Min - V
in
Max., I
out
Rated
Load Regulation I
out
Min. - I
out
Max., V
in
Nom.
Minimum Output Current
Dynamic Regulation, Loadstep
Pk Deviation
Settling Time
Voltage Trim Range
Short Circuit / Overcurrent Protection
Current Limit Threshold Range, % of I
out
Rated
OVP Trip Range
OVP
General
Turn-On Time: 24 & 48V
in
Remote Shutdown
Remote Shutdown Reference
Switching Frequency
Isolation
Input - Output
Input - Case (24 V
in
units)
Output - Case (48 V
in
units)
Temperature Coefficient
Case Temperature
Operating Range
Storage Range
Humidity Max., Non-Condensing
Vibration, 3 Axes, 5 Min Each
MTBF† (Bellcore TR-NWT-000332)
Safety
Weight (Approx.)
10 ms
Positive
V
in
Negative
400 kHz
1500 VDC
500 VDC
500 VDC
†
85
80
EFF. OBS025YG
18 - 36 VDC
34 - 75 VDC
25 mA
Shunt Diode
75
70
65
10
20
30
40
50
EFF. OBS025YH
EFF. OBS025YJ
60
70
80
90
100
±1%
0.2% V
out
0.5% V
out
10 % I
out
Rated
25% I
out
4% V
out
500
µs
±10% I
out
Rated
Hiccup
110 - 140%
115 - 140%V
out
Nom.
Hiccup
LOAD %
Efficiency vs. Load (48V Input)
95
90
EFFICIENCY %
85
80
75
70
65
60
55
10
20
30
40
50
60
70
80
90
100
LOAD %
EFF. OBS017ZE
EFF. OBS025ZG
EFF. OBS025ZH
Notes
MTBF predictions may vary slightly from model to model.
0.03%/°C
-40 to +100°C
-40 to +125°C
95%
5 g, 10 - 55 Hz
1.8 x 10
6
hrs
UL, CUL, TUV
1.9 oz
Specifications typically at 25°C, normal line, and full load, unless otherwise
stated.
Soldering Conditions: I/O pins, 260°C, ten seconds; fully compatible with
commercial wave-soldering equipment.
Units are water-washable and fully compatible with commercial spray or
immersion post wave-solder washing equipment.
C-20
OBS SERIES - 25 WATT
MODELS - (See the last page of this file for options.)
Vin
(Volts)
24
24
24
24
48
48
48
48
Vin Range
(Volts)
18 - 36
18 - 36
18 - 36
18 - 36
34 - 75
34 - 75
34 - 75
34 - 75
Iin Max.*
(Amps)
1.15
1.95
1.90
1.90
0.60
0.94
0.92
0.92
Vout
(Volts)
3.3
5
12
15
3.3
5
12
15
Iout Rated
(Amps)
5.0
5.0
2.1
1.7
5.0
5.0
2.1
1.7
Ripple & Noise
Pk-Pk (mV)
75
75
120
150
75
75
120
150
Efficiency
Typ. **
80%
84%
88%
87%
81%
83%
88%
88%
Model
OBS017YE
OBS025YG
OBS025YH
OBS025YJ
OBS017ZE
OBS025ZG
OBS025ZH
OBS025ZJ
Denotes advanced product release. Consult factory for product availability.
* Maximum input current at minimum input voltage, maximum rated output power.
** At nominal Vin, rated output.
MECHANICAL DRAWING
2.00"
(50.8mm)
0.18" MIN.
(4.6mm)
5
1.100"(27.9mm)
DIA 0.040"
(1.0mm)
0.700"(17.8mm)
2.00"
(50.8mm)
0.600"(15.2mm)
0.400"(10.2mm)
0.200"(5.1mm)
0
1
2
3
4
6
BOTTOM VIEW
7
0.300"(7.6mm)
8
-0.100"(-2.5mm)
-0.50"(-12.7mm)
1.800"
(45.7mm)
0
0.42"
(10.7mm)
-0.10"
(-2.5mm)
Thermal Impedance
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
10.3
7.7
6.3
5.1
4.0
° C/W
°C/W
°C/W
°C/W
°C/W
Pin
1
2
3
4
5
6
7
Function
+V
in
-V
in
No Conn.
Enable
No Pin
+V
out
-V
out
Trim
Tolerances
Inches:
.XX ± 0.020
.XXX ± 0.010
Pin:
± 0.002
Case:
+ 0.04, - 0.00
(Millimeters)
.X ± 0.5
.XX ± 0.25
± 0.05
Note:
Thermal impedance data is dependent on
many environmental factors. The exact
thermal performance should be validated for
specific application.
8
+ 1.0, - 0.00
(Dimensions as listed unless otherwise
specified.)
C-21
OPTIONS
When ordering equipment options, use the following suffix information. Select the option(s) that
you prefer and add them to the model number. Example ordering options are located below the
options table.
OPTION
Negative Logic
Lucent Compatible Trim
Terminal Strip
Trim
Enable
Trim and Enable
Current Share
Headerless
SUFFIX
N
T
TS
1
2
3
4
Y
APPLICABLE SERIES
HAS, HBD, HBS, HES, LES, QBS,
QES, TES, TQD
HAS, HBD, HBS, HES, QBS, QES
XWS
IAS, LES
IAD, IAS, LES, SMS
IAS, LES
SMS
Encapsulated EWS, IWS, OWS
REMARKS
TTL “Low” Turns Module ON
TTL “High” Turns Module OFF
PIN LENGTH AND HEATSINK
OPTIONS
0.110” (2.8mm) Pin Length
0.150” (3.8mm) Pin Length
0.24” (6.1mm) Horizontal Heatsink
0.24” (6.1mm) Vertical Heatsink
0.45” (11.4mm) Horizontal
Heatsink
0.45” (11.4mm) Vertical Heatsink
0.95” (24.1mm) Horizontal
Heatsink
0.95” (24.1mm) Vertical Heatsink
8
9
1H
1V
2H
2V
3H
3V
All Units (Except SMS)
All Units (Except SMS)
All Units (Except DIP, SIP, and SM
Packages)
All Units (Except DIP, SIP, and SM
Packages)
All Units (Except DIP, SIP, and SM
Packages)
All Units (Except DIP, SIP, and SM
Packages)
All Units (Except DIP, SIP, and SM
Packages)
All Units (Except DIP, SIP, and SM
Packages)
Standard Pin Length is 0.180”
(4.6mm)
Includes Thermal Pad
Includes Thermal Pad
Includes Thermal Pad
Includes Thermal Pad
Includes Thermal Pad
Includes Thermal Pad
Example Options:HBS050ZG-ANT3V = HBS050ZG-A with negative logic, Lucent compatible trim, and
0.95” vertical heatsink.
LES015YJ-3N = LES015YJ with optional trim and enable, negative logic.
QBS066ZG-AT8 = QBS066ZG-A with Lucent compatible trim and 0.110” pin length.
NUCLEAR AND MEDICAL APPLICATIONS
Power-One products are not authorized for use as critical components in life support systems, equipment used in
hazardous environments, or nuclear control systems without the express written consent of the President of Power-Once, Inc.
TECHNICAL REVISIONS
The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured.
Specifications are subject to change without notice.
C-105
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