ISOLATED DC/DC CONVERTERS
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
xRSB-40U Series
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Isolated
Fixed Frequency
High Efficiency
High Power Density
Low Cost
Output Voltage Trim
Basic Insulation
RoHS Compliant
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Rev.A
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)
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:
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)
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
80 V
18 V
1500 V
85
°C
125
°C
Notes
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
Min
18 V
-
-
-
Typ
48 V
-
-
-
Max
75 V
2.5 A
3.0 A
3.5 A
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
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Input Specifications (continued)
Parameter
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (rms)
I
2
t Inrush Current Transient
Turn On Voltage Threshold
Turn Off Voltage Threshold
Min
-
-
-
-
-
16.6 V
16.2 V
Typ
60 mA
1 mA
20 mA
3 mA
0.01 A
2
s
17.2 V
16.8 V
Max
120 mA
3 mA
50 mA
7 mA
0.02 A
2
s
17.8 V
17.4 V
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.
Notes
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Vo=1.2 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
0A
0A
0A
0A
0A
0A
0A
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Min
1.182 V
1.478 V
1.773 V
2.463 V
3.250 V
4.925 V
11.750 V
Typ
1.2 V
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
12 V
±0.5
mV
±1.0
mV
±3.0
mV
±4.0
mV
±6.0
mV
±3
mV
±4
mV
±9
mV
±4
mV
±6
mV
±9
mV
±15
mV
±20
mV
-
-
-
-
-
-
-
-
0.5 A s
2
Max
1.218 V
1.523 V
1.827 V
2.538 V
3.350 V
5.075 V
12.250 V
±3
mV
±4
mV
±8
mV
±9
mV
±15
mV
±5
mV
±9
mV
±18
mV
±9
mV
±14
mV
±16
mV
±30
mV
±35
mV
18 A
16 A
14 A
12 A
10 A
8A
3.5 A
1A s
2
Notes
Test conditions:
Vin=48 V; Io=50%
load
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
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
Output Specifications (continued)
Parameter
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
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
Overshoot
25% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 25%
Max Load
Settling Time
Overshoot
25% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 25%
Max Load
Settling Time
Overshoot
25% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 25%
Max Load
Settling Time
Overshoot
25% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 25%
Max Load
Settling Time
Overshoot
25% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 25%
Max Load
Settling Time
470 uF
470 uF
470 uF
470 uF
330 uF
150 uF
10 uF
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
40 mV
45 mV
55 mV
70 mV
90 mV
25 mS
0%
-
-
-
-
-
-
-
-
60 mV
80 uS
60 mV
80 uS
60 mV
80 uS
60 mV
80 uS
180 mV
80 uS
180 mV
80 uS
250 mV
100 uS
250 mV
100 uS
400 mV
150 uS
400 mV
150 uS
70 mV
80 mV
90 mV
120 mV
180 mV
50 mS
5%
15000 uF
10000 uF
10000 uF
5600 uF
4700 uF
2200 uF
220 uF
110 mV
150 uS
110 mV
150 uS
110 mV
150 uS
110 mV
150 uS
250 mV
150 uS
250 mV
150 uS
350 mV
200 uS
350 mV
200 uS
650 mV
300 uS
650 mV
300 uS
-
-
-
-
-
6 mV
10 mV
12 mV
25 mV
30 mV
12 mV
20 mV
25 mV
50 mV
55 mV
Tested at 0-20 MHz
BW, with a 1 uF
ceramic capacitor and
a 10 uF Tantalum
capacitor at the
output.
Min
21 A
19 A
17 A
14 A
11 A
8.8 A
4.2 A
Typ
25 A
22 A
20 A
17 A
14 A
10 A
5A
Max
29 A
26 A
23 A
20 A
16 A
12.5 A
6A
Notes
Recommend to use
AVX TPS series
Tantalum capacitor as
min capacitor.
Vo=1.2 V
Vo=1.5 -1.8 V
Vo=2.5 -3.3 V
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
Vo=5.0 V
Vo=12 V
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
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
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
Over Temperature Protection
Output Voltage Trim Range
Over Voltage Protection
MTBF
78%
79%
81%
83%
85%
85%
83%
450 kHz
500 kHz
-
-
90% Vo
-
82%
84%
85%
86%
87.5%
87%
85%
500 kHz
550 kHz
3900 pF
125
°C
-
130% Vo
TBD
1.3 x 0.9 x 0.446
33.0 x 22.9 x 11.34
1.3 x 0.9 x 0.460
33.0 x 22.9 x 11.39
-
14 g
-
-
-
-
-
-
-
550 kHz
600 kHz
-
-
110% Vo
160% 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
Min
Typ
Max
Notes
Vin=48 V, full load
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
0RSB-40Uxxx
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
2.4 V
-0.3 V
2.4 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
24 Vdc/48 Vdc Input 1.2 Vdc - 12 Vdc / 18 A - 3.5 A Outputs, 1/16 Brick
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.
1) Trim Equations for Vo=1.2 V
Vo
R
trimdown
=
511
−
10.22
delta
Module
Trim
Rtrimdown
R
trimup
=
(100
+
delta
)
⋅
Vo
⋅
5.11
−
313
−
10.22
0.6125
⋅
delta
GND
Note:
delta
=
(
Vo
_
req
−
Vo
)
×
100
[
%
]
Vo
Module
Vo=1.202 V
Vo
Rtrimup
Trim
Vo_req=Desired (trimmed) output voltage [V]
GND
2) Trim Equations for Vo=1.5 V - 12 V
R
trimdown
=
511
−
10.22
delta
R
trimup
=
Note:
(100
+
delta
)
⋅
Vo
⋅
511
−
626
−
10.22
1.225
⋅
delta
delta
=
(
Vo
_
req
−
Vo
)
×
100
[
%
]
Vo
Vo_req=Desired (trimmed) output voltage [V]
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
Embedded System
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