BEL 0REB

ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
0REB-80T15x
RoHS Compliant
PRELIMINARY Rev.A
Features

Isolated
 Remote On/Off)

High Efficiency
 Input Under Voltage Protection

Fixed Frequency (300 KHz)
 Output Over Voltage Protection

High Power Density
 OCP/SCP

Low Cost
 Over Temperature Protection

Class 2, Category 2, Isolated DC/DC Converter (refer to IPC-9592)
Applications

Networking

Computers and peripherals

Telecommunications
Description
The 0REB-80T15x is an isolated DC/DC converter that operates from a nominal 48 Vdc source. This converter
provides up to 75W of output power. Features include remote on/off, short circuit protection, over current
protection, over-temperature protection, output over-voltage protection,input under-voltage protection.
Part Selection
Output Voltage
Input Voltage
15 Vdc
36 Vdc - 75 Vdc
Max. Output
Current
5A
Max. Output
Power
75 W
Typical
Efficiency
92%
Model Number
Active Low
0REB-80T15L
Model Number
Active High
0REB-80T150
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
0 R EB – 80 T 15 x
1 2
3
4
5
6 7
1---Through hole mount
2---RoHS 6, change “R” to “7” means RoHS 5
3---Series name
4---Series code
5---Input range (36-75V)
6---Output voltage (15V)
7---Enable, “0” means active high, and “L” means active low
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
1
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Absolute Maximum Ratings
Min
Typ
Max
Unit
-0.3
-
80
V
-
-
100
V
-0.3
-
18
V
-
-
1500
V
Ambient Temperature
-40
-
85
C
Storage Temperature
-55
-
125
C
Parameter
Continuous non-operating Input
Voltage
Input Transient Voltage
Remote On/Off
I/O isolation voltage
Notes
100mS maximum
Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may
permanently damage the device.
Input Specifications
Parameter
Operating Input Voltage
Min
36
Typ
48
Max
75
Unit
V
Input Current (full load)
-
-
2.8
A
Input Current (no load)
-
60
100
mA
Remote Off Input Current
-
5
10
mA
Input Reflected Ripple Current
(rms)
-
2
5
mA
Input Reflected Ripple Current
(pk-pk)
-
10
20
mA
I t Inrush Current Transient
-
-
1
As
Turn-on Voltage Threshold
34.5
35
35.5
V
Turn-off Voltage Threshold
33
33.5
34
V
2
Notes
With simulated source impedance of
10uH, 5Hz to 20MHz. Use a
100uF/100V electrolytic capacitor with
ESR=1 ohm max, at [email protected]°C.
2
Other information:
Input C-L-C filter
Recommended input fast-acting
fuse on system board
0.47uF-2.2uH-4.4uF
-
4
-
A
CAUTION:This converter is not
internally fused. An input line fuse
must be used in application.
CAUTION: This converter is not internally fused. An input line fuse must be used in application.
Recommend a fast-acting fuse with maximum rating of 4A on system board. Refer to the fuse
manufacture’s datasheet for further information.
Notes: 1. This converter has internal C-L-C (0.47uF-2.2uH-4.4uF) filter.
2. 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
2
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Output Specifications
Parameter
Min
Typ
Max
Unit
14.85
15
15.15
V
Load Regulation
-
0.1
0.2
%
Vin=48V, Io=0~100% load at
o
25 C ambient.
Line Regulation
-
0.1
0.2
%
Vin=36~75V,Io=100% load at
o
25 C ambient
Regulation Over Temperature
(-40deg.C-85deg.C)
-
-
1
%
Output Voltage Set Point
Notes
o
Vin=48V, Io=50% load at 25 C
ambient.
o
Ripple and Noise (pk-pk)
-
60
100
mV
Ripple and Noise (rms)
-
15
30
mV
Ripple and Noise(Pk-Pk) under
worst case
-
-
150
mV
Output Current Range
0
-
5
A
5.5
6
6.5
A
Short Circuit Surge Transient
-
-
TBD
As
Rise time
-
-
10
ms
-
-
40
ms
-
-
20
ms
Overshoot at Turn on
-
0
3
%
Output Capacitance
0
-
1000
uF
△V 50% - 75% of Max Load
-
250
300
mV
Settling Time
-
400
500
uS
△V 75% - 50% of Max Load
-
250
300
mV
Settling Time
-
400
500
uS
Output DC Current Limit
Turn on Time
Vin=48V, Io=100%load at 25 C
ambient, 0-20MHz BW, with a
1µF ceramic capacitor and a
100uF Electrolytic cap at
output.
over all operating input voltage,
load and ambient temperature
condition
2
Transient Response
di/dt=0.1A/us, Vin=48Vdc,
Ta=25°C, with a 1µF ceramic
capacitor and a 100uF
Electrolytic cap at output.
Note: All specifications are typical at nominal input, full load at 25°C unless noted.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
3
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
General Specifications
Parameter
Min
Typ
Max
Unit
Efficiency
90
92
-
%
Switching Frequency
290
300
310
kHz
Output Voltage Trim Range
80
-
110
%
-
TBD
-
-
Over Temperature Protection
-
125
-
℃
Over Voltage Protection(Static)
-
-
18
V
Over Voltage Protection (Dynamic)
-
-
18
V
Weight
-
TBD
-
g
-
-
1500
V
10M
-
-
Ohm
-
2700
-
pF
FIT
2
Notes
The efficiency is measured at
Vin=48V, full load and Ta=25°C.
Calculated Per Bell Core SR-332
(Vin=48 V, Vo=15 V, Io=5 A, Ta =
9
25C, FIT=10 /MTBF)
This voltage is achieved by trimming
up output slowly.
The transient over voltage is achieved
by connecting the Trim pin to Vout+
pin through a 332K resistor.
Isolation characteristics
Input to Output
Isolation Resistance
Isolation Capacitance
Note: All specifications are typical at 25 C unless otherwise stated.
Efficiency Data
95.0%
EFFICIENCY
90.0%
85.0%
36 V
80.0%
48 V
75.0%
75 V
70.0%
65.0%
60.0%
0.5A
1.25A
2.5A
3.75A
5A
OUTPUT CURRENT(A)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
4
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Remote On/Off
Parameter
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Active Low
Active High
Current Sink
Min
-0.3
Typ
-
Max
0.8
Unit
V
2.4
-
18
V
-0.3
-
0.8
V
2.4
-
18
V
0
-
1
mA
Notes
Remote On/Off pin is open, the module
is off.
Remote On/Off pin is open, the module
is on.
Recommended remote on/off circuit for active low
Vin+
Vin+
On/off
On/off
Vin-
Vin-
Control with open collector/drain circuit
Control with photocoupler circuit
Vin+
Vin+
On/off
On/off
Vin-
Vin-
Vcc
Control with logic circuit
Permanently on
Recommended remote on/off circuit for active high
Vin+
Vin+
On/off
On/off
Vin-
Vin-
Control with open collector/drain circuit
Control with photocoupler circuit
Vin+
Vin+
On/off
On/off
Vin-
Vin-
Vcc
Control with logic circuit
Permanently on
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
5
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Output Trim Equations
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 (+). Only one of the resistors should be used for any given
Minimum trim down voltage is 12V
Maximum trim up voltage is 16.5V.
The total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage.
Vout
+sense
511
R

 10.2[ k  ]
trimdow n  %
Trim
Rtrim_down
-sense
GND
5.11 V  100  % 510
o
R


 10.2k
trimup
1.225  %
%
Vout
+sense
Rtrim_up
Trim
Note:
% 
-sense
GND
V DES  Vo
 100
Vo
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=15.000 V
7103
Trim resistor value,Rtrim_up(KOhm)
Trim resistor value Rtrim_down(KOhm)
2103
1.8103
1.610
3
1.4103
1.210
3
110
3
800
600
.
400
200
0
12
12.3 12.6
12.9 13.2
13.5 13.8 14.1
14.4 14.7
Adjusted output voltage Vo,adj (V)
15
6.3103
5.6103
4.9103
4.2103
3.5103
2.8103
2.1103
1.4103
700
0
15
15.15 15.3 15.45 15.6 15.75 15.9 16.05 16.2 16.35 16.5
Adjusted output voltage Vo,adj(V)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
6
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Remote Sense
This module has remote sense compensation feature. It can minimize the effects of resistance between
module’s output and load in system layout and facilitates accurate voltage regulation at load terminals or
other selected point.
1. The remote sense lines carries very little current and hence do not require a large cross-sectional area.
2. This module compensates for a maximum drop of 10% of the nominal output voltage.
3. If the unit is already trimmed up, the available remote sense compensation range should be
correspondingly reduced. The total voltage increased by trim and remote sense should not exceed 10%
of the nominal output voltage.
4. When using remote sense compensation, all the resistance, parasitic inductance and capacitance of the
system are incorpotated within the feedback loop of this module. The can make an effect on the
module's compensation, affecting the stability and dynamic response. A 0.1uF ceramic capacitor can be
connected at the point of load to de-couple noise on the sense wires.
5. Recommend the connection of remote sense compensation as below figure. There are a resistor RS+
(51.1 ohm) from Vo+ to Sense+ and a resistor RS- (51.1 ohm)) from Vo- to Sense- inside of this module.
RS+
Vo+
Sense+
Load
RS-
Sense-
V o-
6. If not using remote sense compensation, please connect sense directly to output at module's pin, that is,
connect sense+ to Vo+ and sense- to Vo- at module's pin, the shorter the better. See below figure.
RS+
V o+
Sense+
Load
RS-
Sense-
Vo-
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
7
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Over Current Protection
To provide protection in a fault output overload condition, the module is equipped with internal current-limiting
circuitry and can endure current limiting for a few mili-seconds. If the overcurrent condition persists beyond a few
milliseconds, the module will shut down into hiccup mode and restart once every 500mS. The module operates
normally when the output current goes into specified range. The typical average output current is 215mA during
hiccup.
Expansion of on time portion of above figure
CH4: Output current waveform
Vin=48V
Over Voltage Protection
The output overvoltage protection consists of circuitry that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the over voltage protection threshold, the module will shutdown.
Test setup:
Waveform: CH1: Output voltage waveform
R=332K
Vo+
K
Trim
R
VoSense+
K
Trim
R
Sense-
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
8
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Input Under-voltage Lockout
Input Current
Under-voltage Lockout
Voltage Falling
V1=33V
V2=35V
Voltage Rising
V1
V2
Input Voltage (V)
Ripple and Noise Waveform
48Vdc input, 15Vdc/5A output
Note: Ripple and noise at full load, with a 1uF ceramic cap and a 100uF electrolytic cap at output, Ta=25 deg C.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
9
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Transient Response Waveforms
Vout= 15V 50%-75% Load Transients
Vout= 15V 75%-50% Load Transients
Note: Transient Response :di/dt=0.1A/uS, 1uF ceramic cap and 100uF electrolytic cap at output.
Startup & Shutdown
Rise Time
Vin=48V, Vo=15V, Io=5A
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
10
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Startup time
Startup from Vin
Ch1: Vo
Ch3: Vin
Vin=48V, Vo=15V, Io=5A
Startup from on/off
Ch1: Vo
Ch3: on/off
Vin=48V, Vo=15V, Io=5A
Startup & Shutdown (continued)
Shutdown
Vin=48V, Vo=15V, Io=5A
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
11
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Thermal Derating Curve
The OTP is achieved by thermistor R12 and the threshold is set at 125C in non-latch mode; the hottest
component Q1 reaches 125C with 100LFM air flow correspondingly. It will restart automatically when the
temperature falls down to 100C. The protecting point will be varied a little under different conditions (air flow,
ambient temperature,input voltage, load...).
Maximum junction temperature of semiconductors derated to 120 degree C.
Derating curve under normal input
Thermal Derating Curve (continued)
Temperature reference points on top side
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
12
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Safety & EMC
Safety
1. Material flammability
2. TUV Certification
3. UL Certification
UL94V-0
EN60950-1
UL60950-1
EMC
1. Surge
IEC61000-4-5
2. DC-DIP
IEC61000-4-29
3. Conductive EMI
EN55022 class A
Compliance to EN55022 class A (both q.peak and average) with the following inductive and capacitive filter
Setup:
C4
+Vin
T1
Conv.positive
input
C1
C2
C3
Conv.negative
input
-Vin
T1
C5
Item
Designator
Parameter
Vendor
Vendor P/N
1
C1
1uF/100V,ceramic
Murata
GRM32ER72A105KA01L
2
C2
0.1uF/100V, ceramic
TDK
C3216X7R2A104K
3
C3
220uF/100V, AL cap
Nichicon
UHE2A221MHD6
4
C4
22nF/1000V,ceramic
+0.022uF/250V,safety
Johanson
Epcos
631S41W223KV4E
B32022B3223+
5
C5
22nF/1000V,ceramic
+0.022uF/250V,safety
Johanson
Epcos
631S41W223KV4E
B32022B3223+
6
T1
1.3mH, common mode
Pulse
P0402NL
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
13
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Safety & EMC (continued)
Positive:
Negative:
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
14
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Aug. 22, 2011
Mechanical Outline
Note: This module is recommended and compatible with Pb-Free Wave Soldering and must be soldered
using a peak solder temperature of no more than 260 ºC for less than 5 seconds.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
15
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/6.5 A Output
OutputConverter
Aug. 22, 2011
Bel
Power, Inc. , a subsidiary of Bel Fuse, Inc.
Revision History
Date
Revision
2011-8-22
A
Changes Detail
Approval
First release
JZ Wang
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
2011 Bel Fuse Inc. Specifications subject to change without notice. 082211
16
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com