ISOLATED DC/DC CONVERTERS
48 Vdc Input
28 Vdc /25 A Output
0RFB-S0T280
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•
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•
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•
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Isolated
RoHS Compliant
•
•
•
•
•
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Rev.C
Output Over-Voltage Latch Off
SCP/OCP (Hiccup Mode)
Isolation Remote On/Off
Auxiliary Bias Power
Inverter Operation Good
(Power Good)
Heatsink for Extended Operation
(Option)
Parallel Operation Using Forced
Current Sharing (Option)
Fixed Frequency (300 kHz)
High Efficiency
High Power Density
Low Cost
Input Over-Voltage Lockout
Input Under-Voltage Lockout
Basic Isolation
Over Temperature Protection
Lockout
Description
The 0RFB-S0T280 is an isolated dc/dc converter that operates from a nominal 48 Vdc source. These units will
provide up to 700 W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and
low cost. Features include remote on/off, over current protection, input under-voltage and over-voltage lockout.
This converter is provided in an industry standard full brick package.
Part Selection
Output
Voltage
28 Vdc
Input Voltage
48 Vdc
Max. Output
Current
25 A
Max. Output
Power
700 W
Typical
Efficiency
91%
Model Number
0RFB-S0T280
Notes:
1. Add “G” suffix at the end of the model number to indicate Tray Packaging.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage
Remote On/Off
I/O isolation voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-10 mA
-
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
80 V
5 mA
1500 V
100
°C
125
°C
It's the temperature of baseplate.
Notes
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input
28 Vdc /25 A Output
Input Specifications
Parameter
Input Voltage
Input Current (no load)
Input Current (full load)
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
Input Reflected Ripple Current
(rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Input Over Voltage Lockout
2
Min
36 V
-
-
-
-
-
-
33 V
31 V
76 V
Typ
48 V
100 mA
-
40 mA
30 mA
10 mA
-
34.5 V
33 V
78 V
Max
76 V
150 mA
23 A
60 mA
-
-
1A s
35.5 V
34 V
80 V
2
Notes
With simulated source impedance of
15 uH, 5 Hz to 20 MHz; use 2* 220
uF/100 V electrolytic capacitor with
ESR = 1 ohm max at 200 kHz
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40deg.C-85deg.C)
Output Current Range
Output Voltage Trim Range
Output DC Current Limit
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 75%
Max Load
75% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
V
O
=28 V
-
-
-
-
800 mV
500 uS
800 mV
500 uS
1200 mV
800 uS
1200 mV
800 uS
di/dt=0.1A/us, Vin=48 Vdc,
with a 1 µF ceramic
capacitor and a 470 uF low
ESR aluminum load
capacitor at output, Ta=25
°C.
Min
27.72 V
-
-
-
0A
16.8 V
26.25 A
-
-
20 mS
-
0 uF
Typ
28.00 V
-
-
-
-
-
30 A
-
-
40 mS
0%
-
Max
28.28 V
56 mV
56 mV
300 mV
25 A
32.2 V
35 A
80 mV
280 mV
80 mS
2%
5000 uF
Over all load, line and temperature
conditions.
Notes
V
in
=48 V, full load
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input
28 Vdc /25 A Output
General Specifications
Parameter
Efficiency
Switching Frequency
Isolation Capacitance
Isolation Resistance
Input to Output
Input to Case
Output to Case
Auxiliary Output Voltage
1
2
Min
88%
-
-
10 M Ohm
-
-
-
7V
-
0V
-
33 V
Typ
91%
300 kHz
1500 pF
-
-
-
-
-
-
Max
-
-
-
-
1500 V
1500 V
500 V
10 V
35 V
2V
Notes
V
in
=48 V, full load
IOG Pin Max Applied Voltage
Remote Sense compensation
Over Temperature Protection
Over Voltage Protection
105
℃
-
-
35.8 V
It's the temperature of baseplate.
Temperature Limits for Power Derating Curves
Semiconductor Junction
Temperature
PCB Board Temperature
Transformer Temperature
MTBF
Dimensions
Inches
millimeters
Weight
-
4.60 x 2.40 x 0.50
116.8 x 61.0 x 12.69
150 g
-
-
-
-
-
-
-
TBD
120
℃
125
℃
125
℃
Calculated Per Bell Core SR-332
(Vin=48 V, Io=normal , T
a
= 25
°C)
Notes:
1. Aux pin source current <=20 mA, ground for the AUX terminal is -S terminal.
2. The signal is low when inverter is normally operating and HIGH when inverter stops or operating
abnormally, maximum sink current is 5 mA.
All specifications are typical at 25
°C
unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
The Converter ON
Isink
The Converter Off
-10 mA
-
0 mA
1 mA
-
5 mA
Min
Typ
Max
Notes
Note:
+ON/OFF, -ON/OFF terminal, Isolation withstand voltage to input or output or baseplate:500 Vdc.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input
28 Vdc /25 A Output
Output Trim Equations
1.
Equations for calculating the trim resistor are shown below. The Trim Down resistor should be connected
between the Trim pin and Sense(-) pin. The Trim Up resistor should be connected between the Trim pin and the
Sense(+) pin. Only one of the resistors should be used for any given application.
Sense(+)
Rtrimdown
=
600
−
6
[
k
Ω
]
delta
Module
Trim
Rtrimdown
Sense(-)
(100
+
delta
)
⋅
Vo
⋅
6
−
600
Rtrimup
=
−
6
[
k
Ω
]
delta
Sense(+)
Rtrimup
Module
Trim
Sense(-)
Note:
delta
=
(
Vo
_
req
−
Vo
)
×
100
[
%
]
Vo
Vo_req=Desired(trimmed) output voltage[V], Output voltage Vo=28 V
2.
Output Voltage Adjustement by applying external voltage:
Vout=Trim Terminal Voltage X Nominal Output Volgage.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input
28 Vdc /25 A Output
Efficiency Data
95.0%
EFFICIENCY
90.0%
85.0%
80.0%
75.0%
70.0%
2.50
36 V
48 V
76 V
6.25
12.50
18.75
25.0
OUTPUT CURRENT(A)
Thermal Derating Curve
Notes:
1. VIN=48 V, with maximum junction temperature of semiconductors derated to 120C.
2. Custom need to add extended heatsink to keep the baseplate temperature.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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