BEL 0REB-80T12_12

ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
0REB-80T12x
RoHS Compliant
Final Rev.C
Features

Isolated

Remote On/Off Logic (Optional)

High Efficiency

Input Under Voltage Protection

Fixed Frequency (400 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)

UL60950-1 Recognized (UL/cUL) (Pending)
Applications

Networking

Computers and peripherals

Telecommunications
Description
The 0REB-80T12x is an isolated dc/dc converter that operates from a nominal 48 Vdc source. This converter
provides up to 80 W 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. These
converters are provided in an industry standard eighth brick package.
Part Selection
Output Voltage
Input Voltage
12 Vdc
36 Vdc - 75 Vdc
Max. Output
Current
6.5 A
Max. Output
Power
80 W
Typical
Efficiency
93%
Model Number
Active Low
0REB-80T12L
Model Number
Active High
0REB-80T120
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
0 R EB – 80 T 12 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 (12V)
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Absolute Maximum Ratings
Min
Typ
Max
Unit
-0.3
-
75
V
-
-
100
V
Remote On/Off
-0.3
-
18
V
I/O isolation voltage
1500
-
-
V
Ambient Temperature
-40
-
85
C
Storage Temperature
-55
-
125
C
Parameter
Continuous non-operating Input
Voltage
Input Transient 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)
-
-
2.4
A
Input Current (no load)
-
50
100
mA
Remote Off Input Current
-
10
15
mA
Input Reflected Ripple Current
(rms)
-
2
4
mA
Input Reflected Ripple Current
(pk-pk)
-
10
20
mA
I t Inrush Current Transient
-
-
1
As
Turn-on Voltage Threshold
33
34
35
V
Turn-off Voltage Threshold
30
31
33
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
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 3A 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-3.2uF) filter.
2. All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Unit
11.76
12
12.24
V
Load Regulation
-
0.2
0.5
% Vo,set
Vin=48V, Io=0~100% load
Line Regulation
-
0.2
0.5
% Vo,set
Vin=36~75V,Io=100% load
Regulation Over Temperature
(-40deg.C-85deg.C)
-
-
0.02
% Vo,set/C
Ripple and Noise (pk-pk)
-
30
50
mV
Ripple and Noise (rms)
-
5
15
mV
Ripple and Noise (pk-pk)
under worst case
-
-
60
mV
Output Voltage Set Point
Notes
Vin=48V, Io=50% load
Vin=48V, Io=100%load at 25C
ambient, 0-20MHz BW, with a
1µF ceramic capacitor, 10uF
Tantalum cap and a 220uF
electrolytic cap at output.
over all operating input voltage,
load and ambient temperature
condition
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Output Specifications (continued)
Parameter
Min
Typ
Max
Unit
Output Current Range
0
-
6.5
A
Output DC Current Limit
7
8.5
10
A
Short Circuit Surge Transient
-
-
0.05
As
Rise time
-
-
15
mS
-
25
30
mS
Enable form Vin
-
25
30
mS
Enable form ON/OFF
-
0
3
%
220
-
3000
uF
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
△V
Overshoot
50%~75%
of Max Load Settling Time
△V
Overshoot
75%~50%
of Max Load Settling Time
Vo=
12 V
Notes
2
-
200
250
mV
-
600
750
uS
-
200
250
mV
-
600
750
uS
di/dt=0.1A/us, Vin=48Vdc, Ta=25°C,
with a 1µF ceramic capacitor, 10uF
Tantalum cap and a 220uF
electrolytic cap at output.
Note: All specifications are typical at nominal input, full load at 25°C unless otherwise stated.
General Specifications
Parameter
Min
Typ
Max
Unit
90
93
-
%
-
400
-
kHz
80
-
110
%
-
110
120
℃
13.8
-
15
V
Over Voltage Protection (Dynamic)
-
-
18
V
Weight
-
18
-
g
Efficiency
Switching Frequency
Output Voltage Trim Range
Over Temperature Protection
Over Voltage Protection(Static)
FIT
2
525
-
2.30 x 0.90 x 0.40
58.42 x 22.86 x 10.20
-
Notes
Vin=48V, full load
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 100K resistor.
Calculated Per Bell Core SR-332
(Vin=48V, Vo=12V, Io=5.2A, Ta = 25
9
C, FIT=10 /MTBF)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Isolation characteristics
Input to Output
1500
-
-
V
Isolation Resistance
10M
-
-
Ohm
-
3900
-
pF
Isolation Capacitance
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
3
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Efficiency Data
94%
EFFICIENCY (%)
92%
90%
88%
36V
48V
86%
75
84%
82%
80%
1.625A
3.25A
4.875A
6.5A
OUTPUT CURRENT (Amp)
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 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
1.8
-
18
V
-0.3
-
0.8
V
1.8
-
18
V
0
-
1
mA
Notes
The remote on/off pin open, Unit off.
The remote on/off pin open, Unit 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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 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 application.
Minimum trim down voltage is 9.6V
Maximum trim up voltage is 13.2V.
The total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage.
Vout
+sense
Rtrimdown 
Rtrimup 
Note:
511
 10.22k 
delta
Trim
Rtrim_down
-sense
GND
(100  delta)  Vo  5.11  626
 10.22k 
1.225 delta
delta 
Vout
+sense
Rtrim_up
Trim
-sense
GND
Vo _ req  Vo  100%
Vo
400
5000
360
4500
Trim resistor value,Rtrim_up(KOhm)
Trim resistor value Rtrim_down(KOhm)
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=12.000 V
320
280
240
200
160
120
80
40
0
4000
3500
3000
2500
2000
1500
1000
500
9.6
9.84 10.08 10.32 10.56 10.8 11.04 11.28 11.52 11.76
Adjusted output voltage Vo,adj (V)
12
0
12
12.12 12.24 12.36 12.48 12.6 12.72 12.84 12.96 13.08 13.2
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 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 incorporated within the feedback loop of this module. It 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+
(40.2 ohm) from Vo+ to Sense+ and a resistor RS- (40.2 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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 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 over current condition persists beyond a few
milliseconds, the module will shut down into hiccup mode and restart once every 300mS. The module operates
normally when the output current goes into specified range. The typical average output current is 1.75A during
hiccup.
Vin=48V
Expansion of on time portion
Over Voltage Protection
The output over voltage 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 into
hiccup mode and restart once every 300mS. The module operates normally when the fault is cleared.
Test setup:
Waveform: CH1: Output voltage waveform
R=100K
Vo+
K
Trim
R
Vo-
Sense+
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Over Temperature Protection
The OTP is achieved by thermistor R67 and the threshold is set at 110C in non-latch mode; the hottest
component Q3 reaches 112C with 100LFM air flow correspondingly. It will restart automatically when the
temperature falls down to 105C. The protecting point will be varied a little under different conditions (air flow,
ambient temperature, input voltage, load...).
Input Under-voltage Lockout
Input Current
Under-voltage Lockout
Voltage Falling
V1=31V
V2=34V
Voltage Rising
V1
V2
Input Voltage (V)
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Ripple and Noise Waveform
48Vdc input, 12Vdc/6.5A output
Note: Ripple and noise at full load, with a 1uF ceramic cap and a 10 uF Tantalum cap and a 220uF electrolytic
cap at output, Ta=25 deg C.
Transient Response Waveforms
Vout= 12V 50%-75% Load Transients
Vout= 12V 75%-50% Load Transients
Note: Transient Response at Vin=48V, di/dt=0.1A/uS, with a 1uF ceramic cap and a 10uF aluminum cap and a
220uF electrolytic cap at the output.
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Startup & Shutdown
Rise Time
Vin=48V, Vo=12V, Io=6.5A
Startup time
Startup from Vin
Ch1: Vo
Ch3: Vin
Vin=48V, Vo=12V, Io=6.5A
Startup from on/off
Ch1: Vo
Ch3: on/off
Vin=48V, Vo=12V, Io=6.5A
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Startup & Shutdown (continued)
Shutdown
Vin=48V, Vo=12V, Io=6.5A
Thermal Derating Curve
Maximum junction temperature of semiconductors derated to 120 degree C.
Derating curve under normal input
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
Thermal Derating Curve (continued)
Temperature reference points on top side
Temperature reference points on bottom side
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, 12 Vdc/6.5 A Output
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 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
100uF/100V, AL cap
Nichicon
UVZ2A101MPD
4
C4
22nF/1000V,ceramic
Johanson
631S41W223KV4E
5
C5
22nF/1000V,ceramic
Johanson
631S41W223KV4E
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
14
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/6.5 A Output
Sep. 13, 2011
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Layout
Layout of components on top side
Layout of components on bottom side
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
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Sep. 13, 2011
.
Mechanical Outline
Pin
Function
Dia.
1
Vin(+)
0.04’’
2
RC
0.04’’
3
Vin(-)
0.04’’
4
Vout(-)
0.062’’
5
RS-
0.04’’
6
TRIM
0.04’’
7
RS+
0.04’’
8
Vout(+)
0.062’’
Note: 1. Pin 5 must be connected to Vout(-)
2. Pin 7 must be connected to Vout(+)
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.
Note:
1) All Pins: Material - Copper Alloy;
Finish – 3 micro inches minimum Gold over 50 micro inches minimum Nickel plate.
2) Undimensioned components are shown for visual reference only.
3) All dimensions in inches (mm); Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm).
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel 201-432-0463  Fax 201-432-9542  www.belfuse.com
16
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/6.5 A Output
OutputConverter
Sep. 13, 2011
Bel
Power, Inc. , a subsidiary of Bel Fuse, Inc.
Revision History
Date
Revision
2010-09-11
PA
Changes Detail
Approval
First release
XF Jiang
1. Updated Turn-on/off voltage threshold in Input specifications.
2010-11-15
PB
2. Updated Load regulation, Line regulation, Output ripple and noise,
Output DC current limit, Turn on time, Output capacitance, Transient
response in Output specifications
XF Jiang
3. Updated Remote on/off.
2011-09-13
PC
1、Output specs: Output DC Current Limit ,Output Capacitance,
Settling Time of Transient Response,Output Ripple and
Noise(RMS)
XF Jiang
2、Thermal Derating Curve
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. 091311
17
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