IBX15 Series
Boost Converters
The boost converters were designed in accordance
with the standards EN 50155 and EN 50121-3-2 to
meet the requirements of various railway and industrial
applications in rugged environment. They are particularly
suitable to expand the input voltage range of power
supplies (e.g. 110IMY15 or 110IMY70 Series DC-DC
converters). An additional circuit allows for providing a
predefined interruption time.
When the input voltage exceeds a predefined output
voltage level, the input voltage is directly fed forward.
The converters exhibit an input EMC-filter.
54.9
2.16"
54.9
2.16"
11.5
0.45"
The boost converters are available in a fully enclosed
case or open-frame (option Z).
Features
•
•
•
•
•
•
•
•
•
•
•
RoHS-compliant for all 6 substances
5 year warranty
Wide input voltage range 16.8 to 154 VDC
Output: 50 to 80 VDC
Class III equipment (no isolation input/output)
Extremely high efficiency
Excellent surge and transient protection
Externally adjustable output voltage
Programmable undervoltage lockout and inhibit
Interruption time with external capacitor
EN 50155, 50121-3-2 observed
Safety-approved to the latest edition of IEC/EN 60950-1
and UL/CSA 60950-1
Table of Contents
Page
Page
Electromagnetic Compatibility (EMC) ...................................7
Immunity to Environmental Conditions .................................9
Mechanical Data .................................................................10
Safety and Installation Instructions .....................................10
Options ............................................................................... 11
Description............................................................................1
Model Selection ....................................................................2
Functional Description ..........................................................2
Electrical Input Data .............................................................3
Electrical Output Data...........................................................5
Auxiliary Functions ...............................................................6
belfuse.com/power-solutions
BCD.00197 Rev AF, 14-May-2018
IBX15 Series
Boost Converters
Model Selection
Table 1: Model Selection
Input voltage
V
i nom
24 V
36 V
1
Operating input range
V
i
16.8 - 154 VDC
25.2 - 154 VDC
Output Voltage
V
o nom
50 - 154 VDC
50 - 154 VDC
Output Current
I
o nom
1.6 A
2.2 A
Efficiency
1
η
min
89 %
91 %
η
typ
93 %
95 %
Type designation
24IBX15-50-0G
36IBX15-50-0G
Options
Z
Efficiency at
V
i
=
V
i min
,
V
o
=
V
o nom,
I
o
=
I
o nom
Functional Description
The IBX15 boost converter is designed as step-up converter in order to increase the input voltage
V
i
to the regulated boost voltage
V
oBr
.
When
V
i
exceeds
V
oB tr
, the output voltage follows
V
i
. The resulting voltage (see fig. 1) is within the range of
V
oB tr
to
V
i max
, which is
suitable for adequate DC-DC converters, e.g. 110IMY15 or 110IMY70 for 24/36IBX15-50. The IBX15 converters have no input-to-output
isolation; isolation is provided by the DC-DC converters connected to the output.
V
o
150
125
100
75
50
25
0
25
50
75 100
125 150
V
i
V
oB tr
= 80 V
V
oB tr
= 50 V
Fig. 1
V
o
versus V
i
depending on V
oB tr
The inrush current is not limited, but the output capacitor of the IBX15 and the input capacitors of the connected DC-DC converters
are relatively small.
The switching frequency is approximately 2
×
200 kHz (interleaved). A current limiting circuit protects the main FETs from overload.
However, the output is not short-circuit proof.
The logic is biased by an auxiliary converter with a switching frequency of approx. 350 kHz. The boost voltage
V
oB
can be trimmed
by resistor
R
BA
to a higher level
V
oB tr
. This allows together with an external storage capacitor
C
hu
the realization of an interruption
time as requested by the railway standard EN 50155. No other components are needed.
JM081b
1
11
12
Vi+
PTC
2
Vo+
Boost
control
logic
D
hu
11
Chu
+
C
hu
Auxiliary
converter
350 kHz
Gi–
R
PUL
3
4
Signal logic
15
D
13
Go–
R
BA
Fig. 2
Functional diagram
PUL
17
16
BA
tech.support@psbel.com
belfuse.com/power-solutions
BCD.00197 Rev AF, 14-May-2018
© 2018 Bel Power Solutions & Protection
Page 2 of 11
IBX15 Series
Boost Converters
General conditions:
- T
A
= 25 °C, unless
T
C
is specified.
Table 2: Input data
Model
Characteristics
V
i
V
i 2s
V
i abs
∆V
i o
I
i
C
i
t
start
P
i 0
P
i SD
Operating input voltage
Temporary input voltage
Input voltage limits
Voltage drop
V
i
– V
o
Typical input current
Input capacitance
Start-up time of
V
o
No-load input power
Input power with shutdown
2s
2 s, without damage
V
i
>
V
oB
V
i min,
I
o nom
for surge calculation
V
i
→
V
i min
or after shutdown
V
i min
–
V
i max,
I
o
= 0
V
i min
–
V
i max,
V
PUL
= 0
1.0
500
1.5
1.0
Conditions
min
16.8
12
24IBX15-50-0G
typ
max
154
168
176
1
8
4
500
1.5
min
25.2
21.3
36IBX15-50-0G
typ
max
154
168
176
1
6
A
µF
ms
W
V
Unit
Electrical Input Data
Input Protection and Fuse
No fuse is incorporated inside the converter. Consequently, an external fuse or a circuit breaker at system level should be installed
to protect against severe defects; see table 3.
Reverse polarity protection is provided by an antiparallel diode across the input, causing the external input fuse or circuit breaker
to trip.
Note:
The fuses in table 4 apply to batteries with
V
i nom
= 24 or 36 V. In applications using batteries with higher voltage, fuses with lower current
may suit better.
Table 3: Recommended external fuses in the non-earthed input line
Converter model
24IBX15-50-0G
36IBX15-50-0G
Fuse type
Littlefuse 218, 10 A / 250 VAC, fast
Littlefuse 218, 8 A / 250 VAC, fast, or:
Schurter SPT 8 A, 300 VDC
Programmable Undervoltage Lockout PUL
The programmable input undervoltage lockout (PUL, pin 17) should be adjusted adequately in order to limit the input current.
Table 4 shows the values of the resistor
R
PUL
, connected between PUL and Vi–, versus the resultant minimum input voltage and
the resultant maximum input current.
Note:
If PUL is connected to Vi–, the converter is disabled (shutdown).
Table 4: Typical values for R
PUL
and the resultant turn-on input voltage V
i LO
. Valid for version V105 (Rev. AE) or later.
24IBX15-50-0G
R
PUL
[kΩ]
∞
110
68
43
27
V
i LO
[V]
15
18
20
23
27
∞
100
56
36
27
36IBX15-50-0G
R
PUL
[k Ω]
V
i LO
[ V]
23
27
30
34
38
tech.support@psbel.com
belfuse.com/power-solutions
BCD.00197 Rev AF, 14-May-2018
© 2018 Bel Power Solutions & Protection
Page 3 of 11
IBX15 Series
Boost Converters
Efficiency
η
[%]
100
90
80
70
60
JM121
Vi = 36 V
Vi = 24 V
0
0.2
0.4
0.6
0.8
I
o
/ I
o nom
Fig. 3
Efficiency versus input voltage and output current (24IBX15-50-0G)
Interruption Time
The interruption time of a system comprised of a step-up converter IBX15 (Rev. AB or later) and connected converters can easily
be increased by an external capacitor
C
hu
and adjusting the boost voltage
V
oB tr
to a higher level.
As an example, fig. 4 shows a 36IBX15-50 supplying a DC-DC converter 110IMY70-12.
Formula for the external boost capacitor
C
hu
:
2 •
P
o
•
t
hu
C
hu
= ––––––––––––––
(V
oB tr 2
–
V
i min2
)
=
=
=
=
=
whereas:
C
hu
P
o
t
hu
V
i m in
V
oB t r
external boost capacitance [mF]
output power = input power of the supplied converter [W]
interruption or hold-up time [ms]
min. input voltage of supplied converters [V]
boost voltage trimmed using
R
BA
[V]
[V]
120
JM123
JM122
100
V
o
+
Input
+
+
80
60
40
20
0
0
10
20
30
ms
t
36IBX15
R
BA
+
C
hu
110IMY70-12
Output
V
Chu
R
PUL
Fig. 4
System with increased interruption time
Fig. 5
Increased interruption time. V
i
=
110 V, C
hu
=
560 µF /100 V,
P
o
= 90 W, V
oB t r
= 80 V, R
BA
= 0 Ω. (24IBX15-50-0G)
The external boost capacitor is loaded by a current source to the preselected boost voltage
V
oB tr
. This current source is activated
after
V
o
has reached or exceeded
V
oB tr
. If the input voltage is increasing further, the boost capacitor is not charged beyond
V
oB tr
.
Consequently, its rated voltage needs not to be much higher than
V
oB tr
.
In the case of input voltage loss, the output voltage
V
oB
drops rapidly to
V
oB tr
until the diode D
hu
connects the output with the boost
capacitor, sustaining the output voltage; see fig. 5. As long as
V
i min
of the supplied converter is not undercut (during
t
hu
), the output
voltage of the supplied converter is not affected.
tech.support@psbel.com
belfuse.com/power-solutions
BCD.00197 Rev AF, 14-May-2018
© 2018 Bel Power Solutions & Protection
Page 4 of 11
IBX15 Series
Boost Converters
Electrical Output Data
General conditions:
- T
A
= 25 °C, unless
T
C
is specified.
V
i
<
V
oB min
,
I
o
<
I
o nom
Table 5: Output data
Output
Characteristics
V
oB r
V
oB tr
I
o nom
v
ow
v
od
t
d
I
BC
t
hu
t
loadC
t
hu
t
loadC
1
24IBX15-50-0G
Conditions
V
i min
,
I
o nom,
R
BA
=
∞
depending on
R
BA
V
i min
– V
i max
,
V
oB r
V
i min
– V
oB r
, 0 –
I
o nom
min
49
49
1.6
±1
±2
±2
2
V
o
≥
V
oB r
C
hu
= 1000 µF,
V
oB tr
= 50 V,
V
i
=
V
i min
C
hu
= 560 µF,
V
oB tr
= 80 V,
V
i
=
V
i min
10
12
3.9
4.3
-
-
11
15
18
10
12
4.8
3.9
typ
50
max
51
80
min
49
49
Boost voltage regulated
Boost voltage trim range
Nominal output current
Static line / load regulation
Dynamic line / load regulation
Dynamic recovery time
Current to boost capacitor
Interruption time
1
Load time for
C
hu 1
Interruption time
1
Load time for
C
hu 1
36IBX15-50-0G
typ
50
2.2
±1
±2
±2
2
4.3
-
-
11
15
18
4.8
max
51
80
Unit
V
A
V
ms
mA
ms
s
ms
s
For other values use the formula in section
Interruption Time
!
Parallel or Series Operation
Not possible.
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-stationary air (convection cooling) at the indicated maximum ambient
temperature
T
A max
(see table
Temperature specifications)
and is operated at its nominal operating conditions, the case temperature
measured at the measuring point of case temperature
T
C
(see
Mechanical Data)
will approach the indicated value
T
C max
after the
warm-up phase. However, the relationship between
T
A
and
T
C
depends heavily on the conditions of operation and integration into
a system. The thermal conditions are influenced by input voltage, output current, airflow, temperature of surrounding components
and surfaces, and the properties of the printed circuit board.
T
A max
is therefore only an indicative value.
Caution:
The case temperature
T
C
measured at the measuring point of case temperature
T
C
(see
Mechanical Data)
shall under no circumstances
exceed the specified maximum value. The installer must ensure that under all operating conditions
T
C
remains within the limits stated in the
table
Temperature specifications.
Overtemperature Protection
The converters are protected from possible overheating by an internal temperature monitoring circuit. It shuts down the converter
above the internal temperature limit, and automatically restarts, after the temperature dropped.
I
o
/
I
o nom
1.0
0.8
0.6
0.4
0.2
0
20
40
60
80
100
°C
T
A
Option Z
JM180
I
o
/
I
o nom
1.0
0.8
0.6
0.4
0.2
0
20
40
60
80
100
°C
T
A
Option Z
JM181
Fig. 6a
24IBX15: I
o
versus temperature
I
o nom
=
1.6 A, V
i
=
16.8 V, V
oB tr
= 50 V
Fig. 6b
36IBX15: I
o
versus temperature
I
o nom
=
2.2 A, V
i
=
25.2 V, V
oB tr
= 50 V
tech.support@psbel.com
belfuse.com/power-solutions
BCD.00197 Rev AF, 14-May-2018
© 2018 Bel Power Solutions & Protection
Page 5 of 11
FPGA/CPLD
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
