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OBS SERIES
Powering Communications and Technology
25 WATT
DESCRIPTION
FEATURES
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.
• Industry standard package • Trim And Enable
• 24 and 48V input versions Pins
• 25W output power
• Fixed Frequency
• 100°C baseplate operation • 1500V Isolation
• 6-Sided Shielding
Efficiency vs. Load (24V Input)
95
90
TECHNICAL SPECIFICATIONS
Voltage Range
24 VDC Nominal
48 VDC Nominal
Reflected Ripple
Input Reverse Voltage Protection
Input
18 - 36 VDC
34 - 75 VDC
25 mA
Shunt Diode
85
80
EFF. OBS025YG
75 EFF. OBS025YH
70 EFF. OBS025YJ
65
10 20 30 40 50 60 70 80 90 100
LO AD %
Output
Setpoint Accuracy
Line Regulation Vin Min - Vin Max., Iout Rated
Load Regulation Iout Min. - Iout Max., Vin Nom.
Minimum Output Current
Dynamic Regulation, Loadstep
Pk Deviation
Settling Time
Voltage Trim Range
Short Circuit / Overcurrent Protection
Current Limit Threshold Range, % of Iout Rated
OVP Trip Range
OVP
General
Turn-On Time: 24 & 48Vin
Remote Shutdown
Remote Shutdown Reference
Switching Frequency
Isolation
Input - Output
Input - Case (24 Vin 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.)
±1%
0.2% Vout
0.5% Vout
10 % Iout Rated
25% Iout
4% Vout
500 µs
±10% Iout Rated
Hiccup
110 - 140%
115 - 140%Vout Nom.
Hiccup
10 ms
Positive
Vin Negative
400 kHz
1500 VDC
500 VDC
500 VDC
0.03%/°C
-40 to +100°C
-40 to +125°C
95%
5 g, 10 - 55 Hz
1.8 x 106 hrs
UL, cUL, TUV
1.9 oz
Efficiency vs. Load (48V Input)
95
90
85
80
75
EFF. OBS017ZE
70 EFF. OBS025ZG
65 EFF. OBS025ZH
60
55
10 20 30 40 50 60 70 80 90 100
LOAD %
Notes
MTBF predictions may vary slightly from model to model.
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.
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Powering Communications and Technology
MODELS - (See the last page of Section for options.)
Selection Chart
Model
Vin
(Volts)
Vin Range
(Volts)
Iin Max.*
(Amps)
OBS025YH 24 18 - 36
OBS025YJ
24 18 - 36
OBS017ZE
48 34 - 75
OBS025ZG 48 34 - 75
OBS025ZH 48 34 - 75
OBS025ZJ
48 34 - 75
1.90
1.90
0.60
0.94
0.92
0.92
* Maximum input current at minimum input voltage, maximum rated output power.
** At nominal Vin, rated output.
Vout
(Volts)
12
15
3.3
5
12
15
OBS SERIES
25 WATT
Iout Rated
(Amps)
2.1
1.7
5.0
5.0
2.1
1.7
Ripple & Noise
Pk-Pk (mV)
120
150
75
75
120
150
Efficiency
Typ. **
88%
87%
81%
83%
88%
88%
MECHANICAL DRAWING
2.00"
(50.8mm)
0.18" MIN.
(4.6mm)
0.600"(15.2mm)
0.400"(10.2mm)
0.200"(5.1mm)
0
5
6
1
BOTTOM VIEW
2
7
3
1.100"(27.9mm)
0.700"(17.8mm)
2.00"
(50.8mm)
0.300"(7.6mm)
DIA 0.040"
(1.0mm)
4
8 -0.100"(-2.5mm)
-0.50"(-12.7mm)
-0.10"
(-2.5mm)
1.800"
(45.7mm)
0.42"
(10.7mm)
Thermal Impedance
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
10.3 °C/W
7.7 °C/W
6.3 °C/W
5.1 °C/W
4.0 °C/W
Note:
Thermal impedance data is
dependent on many environmental
factors. The exact thermal
performance should be validated
for specific application.
Pin Function
1 +Vin
2 -Vin
3 No Conn.
4 Enable
5 No Pin
6 +Vout
7 -Vout
8 Trim
2
Tolerances
Inches:
.XX ± 0.020
.XXX ± 0.010
(Millimeters)
.X ± 0.5
.XX ± 0.25
Pin:
± 0.002
± 0.05
Case:
+ 0.04, - 0.00
+ 1.0, - 0.00
(Dimensions as listed unless
otherwise specified.)

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OPTIONS
Powering Communications and Technology
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.
OPTIONS
Negative Logic
Lucent Compatible Trim
Terminal Strip
Trim
Enable
Trim and Enable
Current Share
Headerless
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
SUFFIX
N
T
APPLICABLE SERIES
REMARKS
HAS, HBD, HBS, HES, HLS, LES,
TTL "Low" Turns Module ON
QBS, QES, QLS, TES, TQD
TTL "High" Turns Module OFF
HAS, HBD, HBS, HES, HLS, QBS, QES,
QLS
TS XWS, XWD, XWT
1 IAS, LES
2 IAD, IAS, LES, SMS
3 IAS, LES
4 SMS
Y Encapsulated EWS, IWS, OWS
Standard Pin Length is 0.180"
(4.6mm)
8 All Units (Except SMS)
9 All Units (Except SMS)
All Units (Except DIP, HLS, HLD, QLS,
1H SIP, SM TLD, and TKD Packages)
Includes Thermal Pad
All Units (Except DIP, HLS, HLD, QLS,
1V SIP, SM TLD, and TKD Packages)
Includes Thermal Pad
All Units (Except DIP, HLS, HLD, QLS,
2H SIP, SM TLD, and TKD Packages)
Includes Thermal Pad
All Units (Except DIP, HLS, HLD, QLS,
2V SIP, SM TLD, and TKD Packages)
Includes Thermal Pad
All Units (Except DIP, HLS, HLD, QLS,
3H SIP, SM TLD, and TKD Packages)
Includes Thermal Pad
All Units (Except DIP, HLS, HLD, QLS,
3V SIP, SM TLD, and TKD Packages)
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-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manu-
factured. Specifications are subject to change without notice.
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