BEL 0RCY

ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
0RCY-50T12x
RoHS Compliant
Rev.E
Features

Isolated

Over Temperature Protection

High Efficiency

OCP/SCP

High Power Density

Low Cost

Fixed Frequency (330 kHz)

Output Voltage Trim

Input Under-Voltage Lockout

Positive/Negative Remote Sense

Output Over-Voltage Shutdown

Basic Insulation

Pre-bias Start Up

Remote On/Off

UL60950-1 Recognized (UL/cUL) (Pending)
Applications

Networking

Computers and peripherals

Telecommunications
Description
The 0RCY-50T12x is isolated dc/dc converter that operates from a wide input range (36 Vdc - 75 Vdc). This unit
will provide up to 72 W of output power. The unit is designed to be highly efficient and low cost. Features include
remote on/off, over current protection, over voltage shut down, over temperature protection and under-voltage
lockout. This converter is provided in an industry standard 1/8 brick package.
Part Selection
Output
Voltage
12 Vdc
Input Voltage
36 Vdc - 75 Vdc
Max. Output
Current
6A
Max. Output
Power
72 W
Typical
Efficiency
92%
Model Number
Active High
0RCY-50T12L
Model Number
Active Low
0RCY-50T120
Note: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
0 R CY – 50 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---Option, “x” of the model part number to be 0-9, A-Z, which will represent the special request of
customer.
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 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Absolute Maximum Ratings
Min
Typ
Max
Unit
Input Voltage (continuous)
-0.3
-
80
V
Remote On/Off
-0.3
-
18
V
-
-
1500
V
Input to Each Output Resistance
10M
-
-
ohm
Ambient Temperature
-40
-
85
C
Storage Temperature
-55
-
125
C
Parameter
I/O Isolation Voltage
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
Input Voltage
Min
36
Typ
48
Max
75
Unit
V
Max Input Current (full load)
-
-
2.4
A
Input Current (no load)
-
50
100
mA
Remote Off Input Current
-
20
30
mA
Input Reflected Ripple Current
(pk-pk)
-
20
30
mA
I t Inrush Current Transient
-
-
0.1
As
Input Fuse (not internally)
-
-
5
A
Turn-on Voltage Threshold
33
34
35
V
Turn-off Voltage Threshold
31
32
33
V
Input Over Voltage Lockout
76
78
80
V
2
Notes
Tested with simulated source
impedance of 10 uH, 5 Hz to 20 MHz;
use a 47 uF/100 V electrolytic cap
with ESR = 1 ohm max. at 200 kHz at
25 C.
2
Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Unit
11.76
12.0
12.24
V
Load Regulation
-
±12
±24
mV
line Regulation
-
±12
±24
mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±80
±120
mV
Ripple and Noise (rms)
-
12
20
mV
Ripple and Noise (pk-pk)
-
50
80
mV
Output Current Range
0
-
6
A
Output Voltage Set Point
Notes
Vin=72V, max load on output,
20MHz BW, with 10uF tantalum
and 1uF ceramic 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
2
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Output Specifications (continued)
Parameter
Min
Typ
Max
Unit
Output DC Current Limit
7.0
-
10
A
Output Over Voltage Clamp
13.6
-
15.6
V
Turn on Time
-
50
80
mS
Rise Time
-
30
40
mS
External Admissible Capacitive Load
0
-
1000
uF
-
200
300
mV
-
150
250
uS
-
200
300
mV
-
150
250
uS
Notes
Non-latching
Transient Response
50% ~ 75%
Max Load
75% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Vo=
12V
Settling Time
di/dt=0.1 A/us, Vin=48 Vdc, Ta=25
°C, with a 1 µF ceramic cap and a
10 uF tantalum cap at output.
Note: All specifications are typical at nominal input, full load at 25°C unless noted.
General Specifications
Parameter
Min
Typ
Max
Unit
Efficiency
90
92
-
%
Switching Frequency
310
330
350
kHz
Isolation capacitance
-
1500
-
pF
Remote Sense Compensation
-
-
10
%
9.6
-
13.2
V
Over Temperature Protection
-
120
-
C
Weight
-
40
-
g
Output Voltage Trim Range
MTBF
TBD
-
2.30 x 0.896 x 0.490
58.41 x 22.76 x 12.44
-
Notes
Measured at Vin=48 V, full load
The total voltage increased by trim and
remote sense should not exceed
10%Vo.
Calculated Per Bell Core SR-332
(Io=80%load, Ta = 25 C)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Note: All specifications are typical at 25 C unless otherwise stated.
Remote On/Off
Parameter
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Current Sink
Active Low
Active High
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
0RCY-50T12L.
The remote on/off pin open, Unit off.
0RCY-50T120.
The remote on/off pin open, Unit on.
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 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Output Trim Equations
Trim Resistor Calculate
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 
511
 10.22k
delta
Module
Trim
Rtrimdown
Sense(-)
Rtrimup  (
(100  delta)  Vo  5.11 511

 10.22)k
1.225  delta
delta
Sense(+)
Rtrimup
Module
Trim
Sense(-)
Note:
delta 
Vo _ req  Vo   100 % 
Vo
400
5000
360
4500
Trim resi stor value,Rtrim_up(KOhm)
Trim resi stor value Rtrim_down(KOhm)
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=12 V
320
280
240
200
160
120
80
3500
3000
2500
2000
1500
1000
500
40
0
4000
9.8
10.02 10.24 10.46 10.68 10.9 11.12 11.34 11.56 11.78
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
4
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Output Trim Equations (continued)
Trim Voltage Calculate
Equations for calculating the trim voltage are shown below.
Vtrim is the required voltage between TRIM and Sense(-).
Sense(+)
Vtrim  (
Vo _ req
 2 . 464  1 . 24 )[V ]
Vo
Module
Trim
Sense(-)
Efficiency Data
Efficient Curve
90%
80%
70%
Efficient
60%
50%
40%
30%
20%
36 V
10%
48 V
75 V
0%
0A
0.6A
1.5A
3A
Output Current (A)
4.5A
6A
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 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Ripple and Noise Waveforms
36 Vdc input, 12 Vdc/6 A output
48 Vdc input, 12 Vdc/6 A output
75 Vdc input, 12 Vdc/6 A output
Note: Ripple and noise at full load, 0-20 MHz BW, Ta=25 deg C, with a 0.1uF ceramic cap and a 10 uF Tantalum
cap at output.
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 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
May 17, 2011
Thermal Derating Curve
Vin=48 V, with maximum junction temperature of semiconductors derated to 120 degree C.
Transient Response Waveforms
50%-75% Load
75%-50% Load
Note: Transients at Vin=48 V, di/dt=0.1 [email protected]=25℃
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
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline
Pin Connections
Pin
Name
Function
Pin Dia
1
Vin+
0.040’’
2
On/Off
3
4
5
6
7
8
VinVoutSenseTrim
Sense+
Vout+
Positive input voltage
Input to turn converter
on and off, referenced
to VinNegative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive output voltage
Positive output voltage
0.040’’
0.040’’
0.062’’
0.040’’
0.040’’
0.040’’
0.062’’
Notes: 1. Pin 5 must be connected to Vout-.
2. Leave Pin 6 open for nominal voltage.
3. 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
8
ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input
OutputConverter
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Revision History
Date
Revision
2011-05-17
E
Changes Detail
Approval
Add trim equation for trim voltage.
XF Jiang
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. 051711
9
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