BEL 0RCY

ISOLATED DC/DC CONVERTERS
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
xRCY-C2T03x
RoHS Compliant
Rev.D
Features

Isolated

Output Voltage Trim

High Efficiency

OCP/SCP

High Power Density

Over Temperature Protection

Fixed Frequency (300 kHz)

Remote On/Off

Low Cost

Positive/Negative Remote Sense

Input Under-Voltage Lockout

Basic Insulation

Output Over-Voltage Protection

Class 2, Category 2, Isolated DC/DC Converter (refer to IPC-9592)
Applications

Networking

Computers and peripherals

Telecommunications
Description
The xRCY-C2T03x is isolated dc/dc converter that operates from a nominal 48 Vdc source. This unit will provide
up to 99 W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and low cost.
Features include remote on/off, over current protection and under-voltage lockout. This converter is provided in
an industry standard eighth brick package.
Part Selection
Output
Voltage
3.3 Vdc
Input Voltage
48 Vdc
Max. Output
Current
30 A
Max. Output
Power
99 W
Typical
Efficiency
93%
Model Number
Active High
xRCY-C2T033
Model Number
Active Low
xRCY-C2T03L
Note: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
x R CY – C2 T 03 x
1 2
3
4
5 6
7
1---Replace”x” with “S” to indicate SMD package, or “0” to indicate through hole package
2---RoHS 6, change “R” to “7” means RoHS 5
3---Series name
4---Series code
5---Input range (36-75V)
6---Output voltage 3.3V
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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
Absolute Maximum Ratings
Min
Typ
Max
Unit
-0.3
-
80
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 Input 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
Input Current (full load)
-
-
3.8
A
Input Current (no load)
-
70
120
mA
Remote Off Input Current
-
10
15
mA
Input Reflected Ripple Current
(rms)
-
5
10
mA
Input Reflected Ripple Current
(pk-pk)
-
-
30
mA
I t Inrush Current Transient
-
-
0.1
As
Turn-on Voltage Threshold
33
-
35.5
V
Turn-off Voltage Threshold
32
-
34.5
V
2
Notes
With simulated source impedance of
10 uH, 5Hz to 20MHz. Use a 100
uF/100 V electrolytic cap with ESR=1
ohm max, at 200 [email protected]°C.
2
Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Min
3.234
Typ
3.30
Max
3.366
Unit
V
Load Regulation
-
±4
±9
mV
Line Regulation
-
±8
±16.5
mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±30
±50
mV
Ripple and Noise (rms)
-
10
20
mV
Ripple and Noise (pk-pk)
-
55
90
mV
Output Current Range
0
-
30
A
Output DC Current Limit
33
-
44
A
Short Circuit Surge Transient
-
2
4
As
Turn on Time
-
-
25
mS
Overshoot at Turn on
-
0
-
%
470
-
5600
uF
Output Capacitance
Notes
Vin=48 V, Io=50%load
0-20MHz BW, with a 1µF ceramic
capacitor and the minimum external
Tantalum cap at output.
2
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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
Output Specifications (continued)
Parameter
Transient Response
Min
Typ
Max
Unit
△V 25%~50%
Overshoot
-
50
100
mV
of Max Load
Settling Time
-
150
250
uS
△V 50%~25%
Overshoot
-
50
100
mV
of Max Load
Settling Time
-
150
250
uS
Notes
di/dt=0.1 A/us, Vin=48 Vdc, with a 1µF
ceramic capacitor and the minimum
external Tantalum cap at output.
Note: All specifications are typical at nominal input, full load at 25°C unless otherwise stated.
General Specifications
Efficiency
Parameter
Min
90
Typ
93
Max
-
Unit
%
Switching Frequency
270
300
330
kHz
Isolation Capacitance
-
2200
-
pF
90
-
110
%
Remote Sense Compensation
-
-
10
%
Over Temperature Protection
-
125
-
C
3.8
-
4.5
%
Output Voltage Trim Range
Over Voltage Protection
MTBF
Notes
Measured at Vin=48 V, full load.
Vin=48V, full load and short feedback
optocoupler.
Vin=48 V, full load, in hiccup Mode
Calculated Per Bell Core SR-332
(Io=80%load, Ta = 25 C)
TBD
Hours
2.30 x 0.90 x 0.40
58.42 x 22.86 x 10.26
-
0RCY-C2T03x
2.30 x 0.90 x 0.46
58.42 x 22.86 x 11.68
-
SRCY-C2T03x
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Weight
-
28
-
g
Note: All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
Current Sink
Active Low
Active High
Min
Typ
Max
Unit
-0.7
-
0.8
V
2.4
-
18
V
-0.7
-
0.8
V
2.4
-
18
V
0
-
1
mA
Notes
xRCY-C2T03L
Remote On/Off pin is open, unit off.
xRCY-C2T033
Remote On/Off pin is 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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 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.
Vout
511
Rtrimdown 
 10.22 k
delta
Module
Trim
GND
Rtrimup 
(100  delta)  Vo  5.11  626
 10.22 k
1 .225  delta
Rtrimdown
Vout
Module
Note:
Vo _ req  Vo   100 % 
delta 
Trim
Rtrimup
GND
Vo
Vo_req=Desired (trimmed) output voltage [V]
Output voltage Vo=3.3 V
Efficiency Data
Efficiency
Efficiency Curve
94%
92%
90%
88%
86%
84%
82%
80%
78%
76%
74%
72%
70%
3.00
36 V
48 V
75 V
7.50
15.00
22.50
30.00
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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
Thermal Derating Curve
Vin=48V, with maximum junction temperature of semiconductors derated to 120 degree C
Ripple and Noise Waveforms
Io=0A Vin=48V
Io=30A Vin=48V
Note: Ripple and noise with a 1uF ceramic cap and a 10 uF 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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
Transient Response Waveforms
Vout=3.3V 75% to 50% Load Transients at Vin=48V
Vout=3.3V 50% to 75% Load Transients at Vin=48V
Note: Transient Response at di/dt=0.1A/uS, External 330uF Tantalum Cap, Ta=25deg C.
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
48 Vdc Input
3.3 Vdc /30 A Output
Jun. 24, 2011
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline
0RCY-C2T03x
Pin Connections
Pin
Name
Pin Dia
1
2
3
4
5
6
7
8
Vin+
RC
VinVoutRSTrim
RS+
Vout+
0.040’’
0.040’’
0.040’’
0.060’’
0.040’’
0.040’’
0.040’’
0.060’’
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
7
ISOLATED DC/DC CONVERTERS
48 Vdc Input
3.3 Vdc /30 A Output
Jun. 24, 2011
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline (continued)
SRCY-C2T03x
Pin Connections
Pin
Name
Pin Dia
1
2
3
4
5
6
7
8
Vin+
RC
VinVoutRSTrim
RS+
Vout+
0.040’’
0.040’’
0.040’’
0.060’’
0.040’’
0.040’’
0.040’’
0.060’’
Note: This module is recommended and compatible with Pb-Free Wave Soldering and must be soldered
using a reflow 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
48 Vdc Input
3.3 Vdc /30 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Jun. 24, 2011
Revision History
Date
Revision
Changes Detail
Approval
2011-01-12
C
Change max input current (full load) from 4.5A to 3.8A in input
specifications.
JZ Wang
2011-06-24
D
Add P/N SRCY-C2T03x with SMD package.
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. 062411
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