OBS DC-DC Series Data Sheet
MCD10043 Rev. 1.0 Page 1 of 2 www.power-one.com
Efficiency vs. Load (48V Input)
General
Output
Input
Efficiency vs. Load (24V Input)
55
60
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
LOAD %
EFF. OBS017Z E
EFF. OBS025Z G
EFF. OBS025Z H
65
70
75
80
85
90
95
10 20 30 40 50 60 70 80 90 100
LO AD %
EFF. O BS025YG
EFF. O BS025YH
EFF. O BS025YJ
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.
• RoHS lead-solder exemption compliant
• Industry-standard package
• 24 and 48 V input versions
• 25 W output power
• 100 °C baseplate operation
• Trim and enable pins
• Fixed frequency
• 1500 V isolation
• 6-sided shielding
Turn-On Time: 24 & 48Vin 10 ms
Remote Shutdown Positive
Remote Shutdown Reference VinNegative
Switching Frequency 400 kHz
Isolation
Input - Output 1500 VDC
Input - Case (24 Vin units) 500 VDC
Output - Case (48 V in units) 500 VDC
Temperature Coefficient 0.03%/°C
Case Temperature
Operating Range -40 to +100 °C
Storage Range -40 to +125 °C
Humidity Max., Non-Condensing 95%
Vibration, 3 Axes, 5 Min Each 5 g, 10 - 55 Hz
MTBF†(Bellcore TR-NWT-000332) 1.8 x 106hrs
Safety UL, cUL, TUV
Weight (Approx.) 1.9 oz
Technical Specifications
Voltage Range
24 VDC Nominal 18 - 36 VDC
48 VDC Nominal 34 - 75 VDC
Reflected Ripple 25 mA
Input Reverse Voltage Protection Shunt Diode
Setpoint Accuracy ±1%
Line Regulation VinMin - VinMax., Iout Rated 0.2% Vout
Load Regulation IoutMin. - IoutMax., Vin Nom. 0.5% Vout
Minimum Output Current 10 % IoutRated
Dynamic Regulation, Loadstep 25% Iout
Pk Deviation 4% Vout
Settling Time 500 μs
Voltage Trim Range ±10% IoutRated
Short Circuit / Overcurrent Protection Hiccup
Current Limit Threshold Range, % of IoutRated 110 - 140%
OVP Trip Range 115 - 140%Vout Nom.
OVP Hiccup
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.
MODEL INPUT VOLTAGE INPUT VOLTAGE MAXIMUM INPUT OUTPUT RATED OUTPUT RIPPLE & NOISE TYPICAL
(VOLTS) RANGE (VOLTS) CURRENT (AMPS)* VOLTAGE (VOLTS) CURRENT (AMPS) pk-pk (mV) EFFICIENCY**
OBS025YH 24 18-36 1.90 12 2.1 120 88%
OBS025YJ 24 18-36 1.90 15 1.7 150 87%
OBS017ZE 48 34-75 0.60 3.3 5.0 75 81%
OBS025ZG 48 34-75 0.94 5 5.0 75 83%
OBS025ZH 48 34-75 0.92 12 2.1 120 88%
OBS025ZJ 48 34-75 0.92 15 1.7 150 88%
NOTES: * Maximum input current at minimum input voltage, maximum rated output power.
** At nominal Vin, rated output.
OBS DC-DC Series Data Sheet
MCD10043 Rev. 1.0 Page 2 of 2 www.power-one.com
Mechanical Drawing
Thermal Impedance
Natural Convection 10.3
°
C/W
100 LFM 7.7
°
C/W
200 LFM 6.3
°
C/W
300 LFM 5.1
°
C/W
400 LFM 4.0
°
C/W
Tolerances
Note:
Thermal impedance data is dependent on
many environmental factors. The exact
thermal performance should be validated
for specific application.
Pin Function
1+V
in
2-V
in
3 No Conn.
4 Enable
5 No Pin
6+V
out
7-V
out
8Trim
Inches: (Millimeters)
.XX ± 0.020 .X ± 0.5
.XXX ± 0.010 .XX ± 0.25
Pin:
± 0.002 ± 0.05
Case:
+ 0.04, - 0.00 + 1.0, - 0.00
(Dimensions as listed unless otherwise specified.)
Model Selection
Model numbers highlighted in yellow or shaded are not recommended for new designs.
NUCLEAR AND MEDICALAPPLICATIONS - Power-One products are not designed, intended for use in, or 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 respec-
tive divisional president of Power-One, 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.
