IBX15 Series Data Sheet
Boost Converters
Features
•
•
•
•
•
•
•
•
•
•
RoHS compliant for all 6 substances
Wide input voltage range 8 to 160 VDC
Output: 30 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
Hold-up time with external capacitor
EN 50155, 50121-3-2 observed
54.9
2.16"
54.9
2.16"
11.5
0.45"
Safety-approved to IEC/EN 60950-1 and UL/CSA
60950-1 2
nd
Ed.
Description
The boost converters were designed in accordance with the
standards EN 50155 and EN 50121-3-2 to meet the re-
quirements of various railway and industrial applications. It is
particularly suitable to increase the input voltage range of
power supplies (e.g. 110IMY15 or 110IMY70 Series con-
verters) in rugged environment. An additional circuit allows for
providing a predefined interruption time.
When the input voltage reaches the predefined output voltage
level, the input voltage is directly fed forward. The converters
exhibit an EMC-filter on the input.
The boost converter is available in a fully enclosed case or
open-frame (option Z).
Table of Contents
Page
1
2
2
3
3
6
Page
Electromagnetic Compatibility (EMC) ................................ 7
Immunity to Environmental Conditions .............................. 8
Mechanical Data ................................................................. 9
Safety and Installation Instructions .................................. 10
Options ............................................................................. 10
Description .........................................................................
Model Selection ..................................................................
Functional Description .......................................................
Electrical Input Data ...........................................................
Electrical Output Data .........................................................
Auxiliary Functions ..............................................................
BCD.00197 Rev AB, 02-Dec-2013
Page 1 of 10
IBX15 Series Data Sheet
Boost Converters
Model Selection
Table 1: Model selection
Input voltage
V
i nom
12 V
24 V
36 V
1
2
Operating input range
V
i
8.0 – 50.4 VDC
15.4 – 160 VDC
24 – 160 VDC
Output voltage
V
o
25 – 40 VDC
50 – 160 VDC
50 – 160 VDC
Output current Type designation
I
o nom
3.0 A
1.6 A
2.2 A
12IBX15-25-0G
2
24IBX15-50-0G
36IBX15-50-0G
Efficiency
1
η
min
η
typ
Options
Z
89%
91%
93%
95%
Efficiency at
V
i
=
V
i min
,
V
o
=
V
o nom,
I
o
=
I
o nom
In preparation
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
oBr
, the output voltage follows
V
i
. The
resulting voltage is in the range of
V
oBr
to
V
i max
, which is
suitable for adequate DC-DC converters, e.g. 20IMX15 or
24IMX70 for 12IBX15-25 and 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.
The inrush current is not limited, but the output capacitor and
the input capacitors of the connected DC-DC converters are
relatively small.
The switching frequency is approximately 2
×
200 kHz (inter-
leaved). 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 can be
adjusted to a higher level. This allows together with an
external storage capacitor
C
hu
the realization of an interruption
time requested by the railway standard EN 50155. No other
components are needed.
JM081b
1
11
12
Vi+
Vo+
PTC
2
Boost
control
logic
D
hu
11
Chu
+
C
hu
Auxiliary
converter
350 kHz
3
Signal logic
15
Gi–
4
13
D
R
PUL
PUL
17
Go–
16
R
BA
BA
Fig. 1
Functional diagram
BCD.00197 Rev AB, 02-Dec-2013
Page 2 of 10
IBX15 Series Data Sheet
Boost Converters
Electrical Input Data
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
Typ. input current
Input capacitance
Start-up time of
V
o
No-load input power
Input powerwith 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
500
1.0
500
1.5
1.0
Conditions
12 I BX15-25-0G
min
8.0
6.0
typ
max
50.4
60
60
0.7
10
24I BX15-50-0G
min
15.4
12
typ
max
160
168
176
1
8
4
500
1.5
36IBX15-50-0G
min
24
21.3
typ
max
160
168
176
1
6
A
µF
ms
W
V
Unit
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 3: Output data
Model
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
12 I BX15-25-0G
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
24.5
24.5
3.0
±0.5
±1
±1.5
typ
25
max
25.5
50
24IBX15-50-0G
min
49
49
1.6
±1
±2
±2
2
typ
50
max
51
80
36IBX15-50-0G
Unit
Boost voltage regulated
Boost voltage trim range
Output current, nom.
Static line/load regulation
Dynamic line/load regul.
Dynamic recovery time
49
49
50
2.2
±1
51
80
V
A
±2
±2
2
V
ms
mA
ms
s
ms
Current to boost capacitor
V
o
≥
V
oB r
Interruption time
1
Load time for
C
hu 1
Interruption time
1
Load time for
C
hu 1
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
15
3.9
4.3
--
--
4.8
3.9
4.3
--
--
4.8
--
--
10
12
11
15
18
10
12
11
15
18
s
For other values use the formula in section
Interruption Time
!
BCD.00197 Rev AB, 02-Dec-2013
Page 3 of 10
IBX15 Series Data Sheet
Boost Converters
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 4.
Reverse polarity protection is provided by an antiparallel
diode across the input, causing the external input fuse or
circuit breaker to trip.
Table 4: Recommended external fuses in the non-earthed
input line
Converter model
12 I BX15-25-0G
24IBX15-50-0G
36IBX15-50-0G
Fuse type
Littlefuse 218, 10 A / 250 VAC, fast
Littlefuse 218, 10 A / 250 VAC, fast
Littlefuse 218, 8 A / 250 VAC, fast,
or: Schurter SPT 8A, 300 VDC
Efficiency
η
[%]
100
90
V
i = 24 V
80
70
60
JM121
V
i = 36 V
0
0.2
0.4
0.6
0.8
I
o
/
I
o nom
Fig. 2
Efficiency versus input voltage and output current
(24IBX15-50-0G)
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.
Interruption Time
The interruption time (hold-up time) of a system comprised of
a step-up converter and connected converters can easily be
increased by an external capacitor
C
hu
and adjusting the
boost voltage
V
oB t r
to a higher level. As an example, fig. 3
shows a 36IBX15-50 supplying a DC-DC converter 110IMY70-
12; see fig. 3a
JM123
Programmable Undervoltage Lockout PUL
The programmable input undervoltage lockout (PUL, pin 17)
should be adjusted adequately in order to limit the input
current. Table 5 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.
Table 5a: Typical values for R
PUL
and the resultant turn-on
input voltage V
i LO
.
12 I BX15-25-0G
R
PUL
[k
Ω
]
∞
V
i LO
[V]
9
10
12
14
16
+
Input
+
+
36IBX15
+
C
hu
R
BA
110IMY70-12
Output
R
PUL
Fig. 3
System with increased interruption time
Formula for the external boost capacitor
C
hu
:
2 •
P
o
•
t
hu
• 100
C
hu
= –––––––––––––––
(V
oB tr 2
–
V
i min2
)
whereas:
C
hu
= external boost capacitance [mF]
P
o
= output power = input power of the supplied
converter [W]
t
hu
= interruption or hold-up time [ms]
V
i m in
= min. input voltage of supplied converters [V]
V
oB tr
= boost voltage trimmed using
R
BA
[V]
The external boost capacitor is loaded by a current source to
the preselected boost voltage
V
oB tr
. This current source is only
activated after
V
oB
has reached or exceeded
V
oB r
. 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
.
Table 5b: Typical values for R
PUL
and the resultant turn-on
input voltage V
i LO
.
24IBX15-50-0G
R
PUL
[k
Ω
]
∞
86.4
53.3
34.0
22.6
V
i LO
[V]
16
18
20
23
27
∞
53
26.5
13.4
7.3
36IBX15-50-0G
R
PUL
[k
Ω
]
V
i LO
[V]
23
27
30
34
38
Note:
If PUL is connected to Vi–, the converter is disabled
(shutdown).
BCD.00197 Rev AB, 02-Dec-2013
Page 4 of 10
IBX15 Series Data Sheet
Boost Converters
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 to the
boost capacitor, sustaining the output voltage; see fig. 4.
Because
V
i min
of the supplied converter is not reached during
t
h u
, the output voltage remains constant.
I
o
/
I
o nom
1.0
0.8
0.6
[V]
120
100
80
60
40
20
0
0
10
20
30
ms
t
V
o
JM122
JM119
1 m/s = 200 LFM
0.5 m/s = 100 LFM
natural cooling
0.4
0.2
0
20
40
60
80
100
°C
T
A
Fig. 5a
Max. output current versus temperature (24IBX15)
V
Chu
I
o
/
I
o nom
1.0
0.8
0.6
0.4
1 m/s = 200 LFM
0.5 m/s = 100 LFM
natural cooling
JM120
Fig. 4
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)
0.2
0
20
40
60
80
100
°C
T
A
Parallel or Series Operation
This is not possible.
Fig. 5b Option Z
Max. output current versus temperature (24IBX15)
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)
may 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
means of an internal temperature monitoring circuit. It shuts
down the converter above the internal temperature limit, and
automatically restarts, after the temperature dropped to the
specified value.
BCD.00197 Rev AB, 02-Dec-2013
Page 5 of 10
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