ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick
Apr. 12, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
RoHS Compliant
•
•
•
•
•
•
•
xRSB-50T Series
•
Isolated
•
Fixed Frequency (600 kHz)
•
High Efficiency
•
High Power Density
•
Low Cost
•
Output Voltage Trim
•
Basic Insulation
Rev.F
Input Under Voltage Lockout
Output Over Voltage Shutdown
OCP/SCP
Over Temperature Protection
Remote On/Off (option)
Positive/Negative Remote Sense
Through Hole and SMT (option)
•
UL60950-1 Recognized (UL/cUL)
Description
The xRSB-50T series are isolated dc/dc converters that operate from a nominal 48 Vdc source. These units will
provide up to 60 W of 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 sixteenth brick package.
Part Selection
Output
Voltage
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
12 V
Input
Voltage
36 V - 75 V
36 V - 75 V
36 V - 75 V
36 V - 75 V
36 V - 75 V
36 V - 75 V
Max. Output
Current
22 A
20 A
18 A
15 A
12 A
5A
Max. Output
Power
33 W
36 W
45 W
50 W
60 W
60 W
Typical
Efficiency
85%
87%
87%
89%
90%
89%
Model Number
Active Low
xRSB-50TV5L
xRSB-50TV8L
xRSB-50T02L
xRSB-50T03L
xRSB-50T05L
xRSB-50T12L
Model Number
Active High
xRSB-50TV50
xRSB-50TV80
xRSB-50T025
xRSB-50T033
xRSB-50T050
xRSB-50T120
Notes:
1. Add “G” suffix at the end of the model number to indicate Tray Packaging. Replace”x” with “S” to
indicate SMT package, or “0” to indicate through hole package.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Input Voltage Transient (100 ms)
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-0.3 V
-
-40
°C
-55
°C
-
-
-
-
Typ
-
Max
80 V
100 V
18 V
1500 V
85
°C
125
°C
Notes
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick
Apr. 12, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Parameter
Min
36 V
-
-
-
-
-
-
31 V
30 V
Typ
48 V
-
70 mA
1 mA
20 mA
3 mA
0.01 A s
32 V
31 V
2
Input Specifications
Input Voltage
Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn On Voltage Threshold
Turn Off Voltage Threshold
2
Max
75 V
2.4 A
120 mA
3 mA
50 mA
7 mA
0.02 A s
35 V
34 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.
Output Specifications
Parameter
Output Voltage Set Point
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=1.5 - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Load Regulation
Vo=1.5 - 2.5 V
Vo=3.3 - 5.0 V
Vo=12 V
Regulation Over Temperature(-40
°C
to +85
°C)
Vo=1.5 - 1.8 V
Vo=2.5 - 3.3 V
Vo=5.0 V
Vo=12 V
Output Current
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
0A
0A
0A
0A
0A
0A
-
-
-
-
-
-
22 A
20 A
18 A
15 A
12 A
5A
-
-
-
-
-
-
-
-
-
-
-
-
1.478 V
1.773 V
2.463 V
3.250 V
4.925 V
11.750 V
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
12.0 V
±0.5
mV
±1
mV
±3
mV
±4
mV
±10
mV
±3
mV
±4
mV
±9
mV
±6
mV
±9
mV
±15
mV
±20
mV
1.523 V
1.827 V
2.538 V
3.350 V
5.075 V
12.250 V
±3
mV
±6
mV
±8
mV
±9
mV
±25
mV
±5
mV
±9
mV
±18
mV
±14
mV
±16
mV
±30
mV
±35
mV
Test conditions:
Vin=48 V; Io=50%
load
Min
Typ
Max
Notes
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick
Apr. 12, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Min
Vo=1.5 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
28 A
24 A
22 A
19 A
14 A
5.2 A
-
-
-
-
-
-
-
-
-
-
-
-
-
Vo=1.5 V
Vo=1.8 - 2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
470 uF
470 uF
220 uF
100 uF
22 uF
Typ
34 A
28 A
26 A
22 A
19 A
6.5 A
2
0.5 A s
6 mV
10 mV
12 mV
25 mV
30 mV
40 mV
45 mV
55 mV
70 mV
90 mV
35 mS
0%
-
-
-
-
-
Max
40 A
34 A
30 A
26 A
24 A
8.5 A
2
1A s
12 mV
20 mV
25 mV
50 mV
55 mV
70 mV
80 mV
90 mV
120 mV
180 mV
70 mS
5%
15000 uF
10000 uF
5600 uF
4700 uF
470 uF
Recommend to use
AVX TPS series
Tantalum capacitor as
the min capacitor
Notes
Output Specifications (continued)
Parameter
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (rms)
Vo=1.5 - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Ripple and Noise (pk-pk)
Vo=1.5 - 1.8 V
Vo=2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Turn on Time
Overshoot at Turn on
Output Capacitance
Tested at 0-20 MHz
BW, with a 1 uF
ceramic capacitor and
a Tantalum capacitor
(refer to the min.
output capacitance
below for each output)
at the output.
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
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
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
110 mV
110 uS
110 mV
110 uS
150 mV
120 uS
150 mV
120 uS
220 mV
120 uS
220 mV
120 uS
400 mV
150 uS
400 mV
150 uS
150 mV
180 uS
150 mV
180 uS
250 mV
200 uS
250 mV
200 uS
350 mV
250 uS
350 mV
250 uS
650 mV
300 uS
650 mV
300 uS
Test conditions: di/dt
= 0.1 A/uS, Vin=48 V,
with a 1uF ceramic
capacitor and a
Tantalum capacitor
(refer to the min.
output capacitance
above for each
output) at the output.
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
ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick
Apr. 12, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Min
82%
84%
86%
87%
86%
540 kHz
-
90% Vo
80% Vo
120
°C
-
Typ
85%
87%
89%
90%
89%
600 kHz
3900 pF
-
-
-
130% Vo
2,770,832 hours
Max
-
-
-
-
-
660 kHz
-
110% Vo
110% Vo
140
°C
160% Vo
Test conditions: Vin=48 V, full load and
short the feedback optocoupler.
Calculated Per Bell Core SR-332 (I
O
=80% load, Vin=48 V, Vo=5 V; T
a
= 25
°C)
SMT Package
Notes
General Specifications
Parameter
Efficiency
Vo=1.5 V
Vo=1.8 - 2.5 V
Vo=3.3 V
Vo=5.0 V
Vo=12 V
Switching Frequency
Isolation Capacitance
Output Voltage Trim Range
Vo=1.5 - 5.0 V
Vo=12 V
Over Temperature Protection
Over Voltage Protection
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
1.3 x 0.9 x 0.364
33.02 x 22.86 x 9.24
1.3 x 0.9 x 0.388
33.02 x 22.86 x 9.85
13 g
-
Vin=48 V, full load
Through Hole Package
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 High
Active Low
-0.3 V
2.95 V
-0.3 V
2.95 V
0 mA
-
-
-
-
-
0.8 V
18 V
0.8 V
18 V
1 mA
When Remote On/Off pin is
open, for active low option, unit
is off; for active high option, unit
is on
Min
Typ
Max
Notes
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick
Apr. 12, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Output Trim Equations
Equations for calculating the trim resistor are shown below (Unit: kΩ). The Trim Down resistor should be
connected between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin
and the Vout. Only one of the resistors should be used for any given application.
Vout
R
trimdown
511
=
−
10.22
delta
Module
Trim
GND
Rtrimdown
R
trimup
=
(100
+
delta
)
⋅
Vo
⋅
5.11
−
626
−
10.22
1.225
⋅
delta
(
Vo
_
req
−
Vo
)
×
100
[
%
]
Vo
Vout
Module
Trim
GND
Rtrimup
Note:
delta
=
Vo_req=Desired (trimmed) output voltage [V]
Vo=1.503 V for 1.5 V output; Vo=1.804 V for 1.8 V output; Vo=2.505 V for 2.5 V output; Vo=3.308 V for 3.3 V
output; Vo=5.002 V for 5 V output; Vo=12.007 V for 12 V output.
Efficiency Data
90%
85%
EFFICIENCY
36 V
48 V
75 V
EFFICIENCY
90%
85%
80%
75%
70%
65%
60%
55%
50%
2A
5A
10A
15A
20A
36V
48V
75V
80%
75%
70%
65%
60%
55%
50%
2.2A
5.5A
11A
16A
22A
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Vo=1.5 V
Vo=1.8 V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
