BEL 0RQ1-T0T12_12

ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
0RQ1-T0T12x
RoHS Compliant
Rev.D
Features

Isolated

Output Over Voltage Shutdown

High Efficiency

Output Voltage Trim

Fixed Frequency (270 kHz)

Over Temperature Protection

High Power Density

SCP/OCP

Input Under Voltage Lockout

Low Cost

Input Over Voltage Lockout

Basic Insulation

Positive/Negative Remote Sense

Remote On/Off

Trim and Remote Sense Function (Optional)

Class 1, Category 2, Isolated DC/DC Converter (refer to IPC-9592)

UL60950-1 Recognized (UL/cUL) (Pending)
Applications

Networking

Computers and peripherals

Telecommunications
Description
The 0RQ1-T0T12x are isolated dc/dc converters that operate from a nominal 48 Vdc source. These units will
provide up to 300 W output power from a nominal 48 Vdc input. These units are designed to be highly efficient
and low cost. Features include remote on/off, over current protection and under-voltage lockout. These
converters are provided in an industry standard quarter brick package.
Part Selection
Output Voltage
Input Voltage
36 Vdc - 75 Vdc
Max. Output
Current
25 A
Max. Output
Power
300 W
Typical
Efficiency
95%
Model Number
Active Low
0RQ1-T0T12L
Model Number
Active High
0RQ1-T0T120
12 Vdc
12 Vdc
36 Vdc - 75 Vdc
25 A
300 W
95%
0RQ1-T0T12B
0RQ1-T0T12A
Note: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
0 R Q1 – T0 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, 1/4 brick
4---Series code
5---Input range (36-75V)
6---Output voltage (12V)
7---Suffix, “0”&“L”indicated the unit with trim and remote sense function, and “A”&“B” without trim and
remote sense function.
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/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
Absolute Maximum Ratings
Parameter
Continuous non-operating Input
Voltage
Min
Typ
Max
Unit
-0.3
-
80
V
Remote On/Off
-0.3
-
18
V
I/O Isolation Voltage
-
-
2250
V
Ambient Temperature
-40
-
85
C
Storage Temperature
-55
-
125
C
Notes
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
Input Current (full load)
Input Current (no load)
-
-
10
A
-
90
-
mA
Remote Off Input Current
-
10
-
mA
Input Reflected Ripple Current
(rms)
-
15
-
mA
Input Reflected Ripple Current
(pk-pk)
-
50
-
mA
I t Inrush Current Transient
-
TBD
-
As
Turn-on Voltage Threshold
-
34.5
35.5
V
Turn-off Voltage Threshold
32.5
34
-
V
2
Unit
V
Notes
With simulated source impedance of
10 uH, 5 Hz to 20 MHz; use a 100
uF/100 V electrolytic capacitor with
ESR = 1 ohm max, at 200 [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 14A on system board. Refer to the fuse
manufacture’s datasheet for further information.
Note: 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
-
±30
±60
mV
Line Regulation
-
±12
±24
mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±60
±100
mV
Ripple and Noise (pk-pk)
-
50
100
mV
Ripple and Noise (rms)
-
20
50
mV
Output Current Range
0
-
25
A
Output DC Current Limit
26
32
38
A
Output Voltage Set Point
Notes
Vin=48 V, Io=50%Load
0 - 20 MHz BW, with 1 uF ceramic
load capacitor and a 10 uF
tantalum capacitor 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
2
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
Output Specifications (continued)
Parameter
Min
Typ
Max
Unit
2
Short Circuit Surge Transient
-
TBD
-
As
Turn on Time
-
80
120
mS
Overshoot at Turn on
-
0
3
%
Output Capacitance
0
-
5600
uF
Transient Response
△V
Overshoot
50%~75%
of Max Load Settling Time
△V
75%~50%
of Max Load
Overshoot
Vo=
12 V
Settling Time
-
-
600
mV
-
-
300
uS
-
-
600
mV
-
-
300
uS
Notes
di/dt=0.1A/us, Vin=48Vdc, Ta=25
°C, with 1 uF ceramic capacitor and
a 10 uF tantalum capacitor at the
output.
Note: All specifications are typical at nominal input, full load at 25°C unless otherwise stated.
General Specifications
Parameter
Min
Typ
Max
Unit
94
95
-
%
Switching Frequency
-
270
-
kHz
Isolation Capacitance
-
2200
-
pF
Over Temperature Protection
-
125
-
℃
Over Voltage Protection
-
14
-
V
80
-
105
%Vo,set
Remote Sense Compensation
-
-
5
%Vo,set
Weight
-
71
-
g
Efficiency
Output Voltage Trim Range
FIT
TBD
-
2.28 x 1.45 x 0.50
57.91 x 36.83 x 12.70
-
Notes
Vin=48 V, full load.
The total voltage increased by trim
and remote sense should not exceed
5%Vo.
Calculated Per Bell Core SR-332
(Vin=48 V, Vo=12 V, Io=20 A, Ta =
9
25 C, FIT=10 /MTBF)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
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/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
Efficiency Data
98.00%
96.00%
94.00%
92.00%
36 V
90.00%
48 V
88.00%
75 V
86.00%
84.00%
82.00%
80.00%
2.50
6.25
12.50
18.75
25.00
OUTPUT CURRENT(A)
Thermal Derating Curve
Maximum junction temperature of semiconductors derated to 120 degree C.
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/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
Ripple and Noise Waveform
48 Vdc input, 12 Vdc/25 A output
Note: Ripple and noise at full load, with a 1uF ceramic cap and a 10 uF Tantalum cap at output, Ta=25 deg C.
Transient Response Waveforms
50%-75% Load Transients at Vin=48 V
75%-50% Load Transients at Vin=48 V
Note: Transient response at di/dt=0.1A/us, with a 1uF ceramic cap and a 10uF Tantalum cap at output, and
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
5
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 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
-
0.75
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
6
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 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 GND pin. The Trim Up resistor should be connected between the Trim pin and the
Vout pin. Only one of the resistors should be used for any given application.
Minimum trim down voltage is 9.6V
Maximum trim up voltage is 12.6V.
The total voltage increased by trim and remote sense should not exceed 5% of the nominal output voltage.
Rtrimdown 
511
 10.22 k
delta
Vout
Module
Trim
GND
Rtrimup 
(100  delta)  Vo  5.11  626
 10.22k
1.225  delta
Rtrimdown
Vout
Module
Trim
Rtrimup
GND
Note:
delta 
Vo _ req  Vo   100 % 
Vo
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=12 V
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/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 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 5% 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 5%
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+
(100 ohm) from Vo+ to Sense+ and a resistor RS- (51 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
8
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Jun. 14, 2011
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline
0RQ1-T0T120 & 0RQ1-T0T12L
Pin Connections
pin#
1
2
3
4
5
6
7
8
function
Vin (+)
On/Off
Vin (-)
Vo (-)
RS (-)
Trim
RS (+)
Vo (+)
pin size
0.04"
0.04"
0.04"
0.06"
0.04"
0.04"
0.04"
0.06"
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/25 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 14, 2011
Mechanical Outline
0RQ1-T0T12A & 0RQ1-T0T12B
Pin Connections
pin#
1
2
3
4
5
function
Vin (+)
On/Off
Vin (-)
Vo (-)
Vo (+)
pin size
0.04"
0.04"
0.04"
0.06"
0.06"
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
10
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/25 A Output
OutputConverter
Jun. 14, 2011
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Revision History
Date
Version
Changes Detail
Approval
2008-10-17
A
First release
HL
2009-04-16
B
1. Change to new format; 2. Update the I/O isolation voltage, min
efficiency and output DC current limit.
HL
2010-01-14
C
Remove”Preliminary”
2011-06-14
D
Add P/N 0RQ1-T0T12A and 0RQ1-T0T12B without trim and remote
sense function.
Jack
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. 061411
11
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