ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Converter
Apr. 07, 2011
Bel Power Inc., a subsidiary
of Bel Fuse Inc.
xRSB-40U Series
Features
Isolated
Fixed Frequency
High Efficiency
High Power Density
Low Cost
Output Voltage Trim
Basic Insulation
RoHS Compliant
Rev.C
Input Under Voltage Lockout
Output Over Voltage Shutdown
OCP/SCP
Over Temperature Protection
Wide Input Voltage
Positive/Negative Remote Sense
Through Hole and SMT(Option)
Input Over Voltage Protection
Remote On/Off Logic (Option)
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 xRSB-40U series are isolated dc/dc converters that operate from a nominal 24 Vdc or 48 Vdc source. These
units will provide up to 40 W of output power from an 18 Vdc - 75 Vdc wide input range. 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 sixteenth brick package.
Part Selection
Output
Voltage
1.2 Vdc
1.5 Vdc
1.8 Vdc
2.5 Vdc
3.3 Vdc
5.0 Vdc
12 Vdc
Input Voltage
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
18 Vdc - 75 Vdc
Max. Output
Current
18 A
16 A
14 A
12 A
10 A
8A
3.5 A
Max. Output
Power
22 W
24 W
25 W
30 W
33 W
40 W
42 W
Typical
Efficiency
82%
84%
85%
86%
87.5%
87%
85%
Model Number
Active Low
xRSB-40UV2L
xRSB-40UV5L
xRSB-40UV8L
xRSB-40U02L
xRSB-40U03L
xRSB-40U05L
xRSB-40U12L
Model Number
Active High
xRSB-40UV20
xRSB-40UV50
xRSB-40UV80
xRSB-40U025
xRSB-40U033
xRSB-40U050
xRSB-40U120
Notes:
Add “G” suffix at the end of the model number to indicate Tray Packaging.
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
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Converter
Apr. 07, 2011
Bel Power Inc., a subsidiary
of Bel Fuse Inc.
Part Number Explanation
x R SB – 40 U xx x
1 2
3
4
5
6 7
1---Replace”x” with “S” to indicate SMT package, or “0” to indicate through hole package
2---RoHS 6, change “R” to “7” means RoHS 5
3---Series name, 1/16 Brick
4---Series code
5---Input range (18-75V)
6---Output voltage, V2=1.2Vout, V5=1.5Vout, V8=1.8Vout, 02=2.5Vout, 03=3.3Vout, 05=5.0Vout, 12=12Vout
7---Option, “x” of the model part number to be 0-9, A-Z, which will represent the special request of
customer.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Input Transient Voltage
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3
-
-0.3
-
-40
-55
Typ
-
-
-
-
-
-
Max
80
100
18
1500
85
125
Unit
V
V
V
V
C
C
100mS maximum
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
Input Current (full load)
Vo=1.2 V - 1.8 V
Vo=2.5 V - 3.3 V
Vo=5.0 V - 12 V
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
Input Reflected Ripple Current
(rms)
Input Over Voltage Lockout
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
Min
18
-
-
-
-
-
-
-
78
-
16.6
16.2
Typ
48
-
-
-
60
1
20
3
-
0.01
17.2
16.8
Max
75
2.5
3.0
3.5
120
3
50
7
82
0.02
17.8
17.4
Unit
V
A
A
A
mA
mA
mA
mA
V
As
V
V
2
Notes
Tested with simulated source
impedance of 15 uH, 5 Hz to 20 MHz;
use a 100 uF/100 V electrolytic
capacitor with ESR=1 ohm max at 200
kHz at the input.
Note:
All specifications are typical at nominal input, full load 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
2
ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Converter
Apr. 07, 2011
Bel Power Inc., a subsidiary
of Bel Fuse Inc.
Notes
Output Specifications
Parameter
Output Voltage Set Point
Vo=1.2 V
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Line Regulation
Vo=1.2 V - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Load Regulation
Vo=1.2 - 2.5 V
Vo=3.3 - 5.0 V
Vo=12 V
Regulation Over Temperature(-40
C
to +85
C)
Vo=1.2 V
Vo=1.5 - 1.8 V
Vo=2.5 - 3.3 V
Vo=5.0 V
Vo=12 V
Output Current
Vo=1.2 V
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Short Circuit Surge Transient
Current Limit Threshold
Vo=1.2 V
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Ripple and Noise (rms)
Vo=1.2 V - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Ripple and Noise (pk-pk)
Vo=1.2 V - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
-
-
-
-
-
40
45
55
70
90
70
80
90
120
180
mV
mV
mV
mV
mV
-
-
-
-
-
6
10
12
25
30
12
20
25
50
55
mV
mV
mV
mV
mV
21
19
17
14
11
8.8
3.7
25
22
20
17
14
10
5
33
26
23
20
16
12.5
6
A
A
A
A
A
A
A
0
0
0
0
0
0
0
-
-
-
-
-
-
-
-
-
0.5
18
16
14
12
10
8
3.5
1
A
A
A
A
A
A
A
As
2
Min
1.182
1.478
1.773
2.463
3.250
4.925
11.750
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
1.2
1.5
1.8
2.5
3.3
5.0
12
0.5
1.0
3.0
4.0
6.0
3
4
9
4
6
9
15
20
Max
1.218
1.523
1.827
2.538
3.350
5.075
12.250
3
4
8
9
15
5
9
18
9
14
16
30
35
Unit
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
Test conditions:
Vin=48 V; Io=50% load
Hiccup mode, auto recovery
Tested at 0-20 MHz BW,
with a 1 uF ceramic
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
3
ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Converter
Apr. 07, 2011
Bel Power Inc., a subsidiary
of Bel Fuse Inc.
Notes
Output Specifications (continued)
Parameter
Turn on Time
Overshoot at Turn on
Output Capacitance
Vo=1.2 V
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Transient Response
25% ~ 50%
Max Load
50% ~ 25%
Max Load
25% ~ 50%
Max Load
50% ~ 25%
Max Load
25% ~ 50%
Max Load
50% ~ 25%
Max Load
25% ~ 50%
Max Load
50% ~ 25%
Max Load
25% ~ 50%
Max Load
50% ~ 25%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Vo=12 V
Vo=5.0 V
Vo=2.5 -3.3 V
Vo=1.5 -1.8 V
Vo=1.2 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
60
80
60
80
90
80
90
80
180
80
180
80
250
100
250
100
400
150
400
150
110
150
110
150
180
150
180
150
250
150
250
150
350
200
350
200
650
300
650
300
mV
uS
mV
uS
mV
uS
mV
uS
mV
uS
mV
uS
mV
uS
mV
uS
mV
mS
mV
mS
Test conditions: di/dt = 0.1
A/uS, Vin=48 V, with a 1
uF ceramic capacioor and
a Min Capacitance of
Tantalum capacitor at the
output.
470
470
470
470
330
150
10
-
-
-
-
-
-
-
15000
10000
10000
5600
4700
2200
220
uF
uF
uF
uF
uF
uF
uF
Recommend to use AVX
TPS series Tantalum
capacitor as min capacitor.
Min
-
-
Typ
25
0
Max
50
5
Unit
mS
%
Note:
All specifications are typical at nominal input, full load 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
4
ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Converter
Apr. 07, 2011
Bel Power Inc., a subsidiary
of Bel Fuse Inc.
Notes
General Specifications
Parameter
Efficiency
Vo=1.2 V
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Switching Frequency
Vo=1.2 V -12 V
Vo=1.8 V
Isolation Capacitance
78
79
81
83
85
85
83
450
500
-
82
84
85
86
87.5
87
85
500
550
3900
-
-
-
-
-
-
-
550
600
-
%
%
%
%
%
%
%
KHz
KHz
pF
C
The OTP threshold is set at 125C in
non-latch mode, and the module will
restart automatically when
temperature falls down to 115C.
Min
Typ
Max
Unit
Vin=48 V, full load
Over Temperature Protection
-
125
-
Output Voltage Trim Range
Over Voltage Protection
MTBF
90
-
-
130
TBD
1.30 x 0.90 x 0.493
33.02 x 22.86 x 12.53
1.30 x 0.90 x 0.507
33.02 x 22.86 x 12.89
110
160
% Vo
% Vo
-
-
Test conditions: Vin=48 V, full load
and short the feedback optocoupler.
Calculated Per Bell Core SR-332 (I
O
= Nominal; T
a
= 25
C)
SRSB-40Uxxx
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
-
-
g
0RSB-40Uxxx
Weight
-
14
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
-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
When Remote On/Off pin is
open, for active low option,
unit is off; for active high
option, unit is on
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
5
