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.
RoHS Compliant
0RCY-50T12x
Features
Isolated
High Efficiency
High Power Density
Rev.E
Over Temperature Protection
OCP/SCP
Low Cost
Output Voltage Trim
Positive/Negative Remote Sense
Basic Insulation
Remote On/Off
Fixed Frequency (330 kHz)
Input Under-Voltage Lockout
Output Over-Voltage Shutdown
Pre-bias Start Up
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
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Min
-0.3
-0.3
-
10M
-40
-55
Typ
-
-
-
-
-
-
Max
80
18
1500
-
85
125
Unit
V
V
V
ohm
C
C
Notes
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Remote On/Off
I/O Isolation Voltage
Input to Each Output Resistance
Ambient Temperature
Storage Temperature
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
Max Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
2
Min
36
-
-
-
Typ
48
-
50
20
Max
75
2.4
100
30
Unit
V
A
mA
mA
Notes
-
20
30
mA
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.
I t Inrush Current Transient
Input Fuse (not internally)
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Input Over Voltage Lockout
-
-
33
31
76
-
-
34
32
78
0.1
5
35
33
80
As
A
V
V
V
2
Note:
All specifications are typical at 25
C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
line Regulation
Regulation Over Temperature
(-40deg.C-85deg.C)
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Output Current Range
Min
11.76
-
-
-
-
-
0
Typ
12.0
±12
±12
±80
12
50
-
Max
12.24
±24
±24
±120
20
80
6
Unit
V
mV
mV
mV
mV
mV
A
Vin=72V, max load on output,
20MHz BW, with 10uF tantalum
and 1uF ceramic cap at the output.
Notes
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
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Parameter
Min
7.0
13.6
-
-
0
Typ
-
-
50
30
-
Max
10
15.6
80
40
1000
Unit
A
V
mS
mS
uF
Non-latching
Notes
Output Specifications (continued)
Output DC Current Limit
Output Over Voltage Clamp
Turn on Time
Rise Time
External Admissible Capacitive Load
Transient Response
50% ~ 75%
Max Load
75% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Vo=
12V
-
-
-
-
200
150
200
150
300
250
300
250
mV
uS
mV
uS
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
Efficiency
Switching Frequency
Isolation capacitance
Remote Sense Compensation
Output Voltage Trim Range
Over Temperature Protection
Weight
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
2.30 x 0.896 x 0.490
58.41 x 22.76 x 12.44
-
Min
90
310
-
-
9.6
-
-
Typ
92
330
1500
-
-
120
40
TBD
Max
-
350
-
10
13.2
-
-
Unit
%
kHz
pF
%
V
C
g
-
Calculated Per Bell Core SR-332
(Io=80%load, T
a
= 25
C)
The total voltage increased by trim and
remote sense should not exceed
10%Vo.
Notes
Measured at Vin=48 V, full load
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
2.4
-0.3
2.4
0
Typ
-
-
-
-
-
Max
0.8
18
0.8
18
1
Unit
V
V
V
V
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
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
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
½
511
10.22
k
delta
Module
Trim
Rtrimdown
Sense(-)
(100
delta
)
Vo
5.11 511
Rtrimup
½
(
10.22)
k
1.225
delta
delta
Sense(+)
Rtrimup
Module
Trim
Sense(-)
Note:
delta
½
Vo
_
req
Vo
100
%
Vo
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=12 V
400
Trim resi stor value Rtrim_down(KOhm)
Trim resi stor value,Rtrim_up(KOhm)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
360
320
280
240
200
160
120
80
40
0
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
May 17, 2011
12 Vdc /6 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
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
½
(
Vo
_
req
2 . 464
1 . 24 )[
V
]
Vo
Module
Trim
Sense(-)
Efficiency Data
Efficient Curve
90%
80%
70%
60%
Efficient
50%
40%
30%
20%
10%
0%
0A
0.6A
1.5A
3A
Output Current (A)
4.5A
36 V
48 V
75 V
6A
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
5
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