high transient voltages are present. With an ultra
wide input voltage range of 16-160VDC, the
RUW series is capable of withstanding surges
from 24,36,48,72, 90 and 110V systems, largely
eliminating the requirement for input protection
circuitry.
Optional features include a Power Fail/DC OK
signal and circuitry to facilitate long hold-up times
with a small external capacitor across ±Vint pins.
mAp-p
EFFICIENCY
Order Code
RUW15SL05C
RUW15SL05HC
RUW15SL12C
RUW15SL12HC
RUW15SL24C
RUW15SL24HC
Min.
74.4
71.1
75.1
70.6
74.5
71
24
Typ.
75.9
72.2
77.3
73.5
78.4
74.9
Min.
74.3
72.8
75.7
73.1
74.8
72.9
48
Typ.
75.8
73.8
77.8
75.7
78.8
76.9
Input Voltage
72
Min.
Typ.
73
74.9
72.1
73.3
73.4
76.6
71.8
75
73.9
77.9
72.2
76.2
Units
110
Min.
71.3
70.6
71.8
70.4
72.1
69.9
Typ.
73.7
72.3
75.4
73.9
75.9
74.2
Min.
64.2
61.5
64.7
62.1
64.4
62.9
160
Typ.
69
66.7
70
68.1
70
67.8
V
%
For full details go to
www.murata-ps.com/rohs
1. Part numbers ending HC include optional Power Fail /DC OK signal and circuitry to facilitate long hold up time.
2. Will operate down to 14V for 100ms as required by EN 50155 (24V system).
3. Using Telecordia Issue 1 method I case 1 operating temperature 25C
All specifications typical at T
A
=25°C and rated output current unless otherwise s
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KDC_RUW15.B02
Page 1 of 13
RUW15 Series
Isolated Ultra-Wide Input DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Voltage set point accuracy
Overall voltage envelope
Line regulation
Load regulation
Ripple & noise
Transient response
Start delay
Overvoltage protection
Short circuit protection
RUW15SL12C
RUW15SL12HC, RUW15SL24HC & RUW15SL05HC
RUW15SL24C,
RUW15SL05C
12V & 24V output
10-100% Load
5V output
5V output
BW = 20MHz
12V output
(24V
IN
to 110V
IN
)
24V output
Peak deviation (20-100% & 100-20% swing)
Settling time
From remote on/off RUWSLXXC
From application of V
IN
RUWSLXXC
5V output
12V & 24V output
Continuous
Conditions
5V output
12V & 24V output
Min.
Typ.
0.55
0.8
3.0
Max.
2
1.5
0.5
0.2
1
0.25
1
Units
±%V
OUT
±%V
OUT
±%
±%
mVp-p
%V
OUT
ms
ms
V
OUT
80
70
90
3.0
1.5
100
100
120%
110%
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
Module on
Min.
Typ.
100
OPEN
Max.
Units
kHz
Remote on/off pin functionality
Module off
12V & 24V output
5V output
0
0
0.5
0.8
V
ABSOLUTE MAXIMUM RATINGS
Input voltage, SL input types
Remote On/Off
170V
20V ±5V
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Capacitance
Conditions
Flash tested for 1 second
VISO = 500VDC
5V
OUT
types
12V
OUT
types
24V
OUT
types
Min.
5000
Typ.
2
64
60
76
Max.
Units
VDC
GΩ
pF
ENVIRONMENTAL CHARACTERISTICS
Parameter
Ambient temperature
Storage
Thermal protection
Case temperature rise above ambient
Conditions
See derating graph
Operates at case temperature
5 V 100% load, still air, see derating graph
12V, 24V 100% load, still air, see derating graph
Min.
-40
-50
Typ.
Max.
85
125
Units
120
45
40
°C
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KDC_RUW15.B02
Page 2 of 13
RUW15 Series
Isolated Ultra-Wide Input DC/DC Converters
SAFETY
UL 60950
The RUW15 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 250Vrms in maximum temperature as shown
in the derating graphs.
The RUW15 series of converters are not internally fused so to meet the requirements of UL a 3A anti-surge input line fuse should always be used. File number E151252 applies.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination finish
on this product series is a Gold flash (0.05-0.10 micron) over Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems.
Tinned tabs are provided along the case edges to provide mechanical support through slots in the PCB. Hand soldering of these tabs may be
necessary to ensure satisfactory joint quality.
For further information, please visit www.murata-ps.com/rohs
APPLICATION NOTES
The RUW15 can be used as a general purpose wide input DC/DC converter simply with the addition of the recommended input capacitor, low ESR type 10uF.
Output Capacitors
The RUW series does not require output capacitors to meet datasheet specification. To meet datasheet specifications, total output capacitance should not exceed:
Output Voltage (V)
5
12
24
Max. Recommended Output Capacitance (µF)
1000
470
220
Remote ON/OFF control
The remote ON/OFF input to the RUW15 converter is referenced to the primary ground and when pulled below 0.5V, the RUW15 will not operate. The RUW15 will be
operational if the pin is left open. In noisy environments, it is recommended to decouple the remote ON/OFF pin to ground with a 10nF capacitor.
Hold-up
If hold-up of the output is required on input drop-outs such as occur on battery changeovers, the RUW15 has an optional hold-up feature (-H versions) which maintains
the output if the input voltage falls to zero. The hold-up time can be set by the connection of an external capacitor across the –Vint and +Vint pins. The hold-up time is
independent of the input voltage applied before drop-out
Configuration for extended hold-up time
This capacitor is charged by the RUW15 to around 80 V and is internally switched into the RUW15 input upon input voltage failure. An internal diode prevents this high
voltage appearing on the RUW15 input pins. The capacitor is referenced to the input ground of the RUW15 and therefore should have appropriate isolation clearance to the
RUW15 output circuitry.
As drop-outs are not expected to occur in quick succession, the capacitor is allowed to recharge slowly over about one minute before full hold-up is again available. This
helps to minimise internal stresses in the RUW15 converter. As an example, EN50155 requirement to maintain output for 30 ms on supply change-over (Class C2) is met
with a capacitor of 220 uF rated at 100 V for any nominal input voltage up to 110 VDC with the RUW15 operating at maximum load.
The benefit conferred by the hold-up option is most evident when hold-up from low nominal voltages is required even if the wide input range of the RUW15 is not needed.
In the above example to achieve 30 ms holdup with a capacitor across the input in a 24V nominal system, an expensive and large capacitor of 3900uF would be required
rated at higher than the maximum input voltage.
The below graph shows values of capacitance against hold-up time for 15W loading. At lighter loads the hold-up time increases proportionally. In some applications the
external capacitor could be made up from parallel multilayer ceramic parts which would dramatically improve lifetime compared with alternative electrolytic types.
70
60
50
40
5v
12v
24v
ms
30
20
10
0
0
50
100
150
200
250
300
µF
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KDC_RUW15.B02
Page 3 of 13
RUW15 Series
Isolated Ultra-Wide Input DC/DC Converters
APPLICATION NOTES (continued)
Power Fail Warning Details
A ‘power fail’ signal is available which goes active after the input voltage drops out but before the output loses regulation. Over-temperature and over-voltage monitoring is
included which also activates the ‘power fail’ signal.The signal goes active if the output voltage exceeds approximately 15 % of nominal, if the output is grossly less than
nominal such as under short circuit conditions or if the case temperature exceeds approximately 120 degrees C. The signal is an open pnp emitter output which goes to a
low voltage, typically less than 1V when active, signifying a fault. The signal goes active some milliseconds before the output drops after the converter input drops to zero,
effectively giving a power fail warning.
The actual value of warning time is defined by the hold-up capacitance added as shown below. The signal can sink 50 mA and withstand 30 V in the inactive condition. The
signal is referenced to RUW15 -Vout and typically is pulled to a system rail with a 10K resistor. The open emitter arrangement allows the RUW15 to actively sink current into
the Power Fail output even if the RUW15 is unpowered or short circuited, correctly indicating a fault condition.
Power Fail Warning Graphs
RUW15SL12HC
Power Fail minimum ms.
6
Advance Power Fail time (ms)
5
4
3
2
1
0
RUW15SL24HC
6
Advance Power Fail time (ms)
5
4
3
2
1
0
Power Fail minimum
50
100
150
200
250
300
350
400
450
500
50
100
150
200
250
300
350
400
450
500
Capacitance uF
Capacitance uF
RUW15SL05HC
Power Fail minimum ms.
6
Advance Power Fail time (ms)
5
4
3
2
1
0
RUW15SL24HC
0
50
100
150
200
250
300
350
400
450
500
Capacitance uF
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KDC_RUW15.B02
Page 4 of 13
RUW15 Series
Isolated Ultra-Wide Input DC/DC Converters
SURGE SUPPRESSION
EN50155/RIA12 surge/dip compliance
DC/DC power converters connected to the battery voltage or other low voltage source in railway rolling stock commonly have to comply with the requirements of
European standard EN 50155:2007. This standard defines a range of nominal battery voltages that may be encountered with possible fluctuations and interruptions.
Nominal voltages (Un) are 24V, 48V, 72V, 96V and 110VDC with tolerances of -30/+25%. Fluctuations can take the nominal voltages up +40% for one second and down
-40% for 100ms. The possible total range of nominals and fluctuations is therefore 14.4V to 154V (24V -40% to 110V +40%). Other national variations include US rail
nominal battery voltages of 37V and 74V; higher surges of 1.5 x Un for one second and 3.5 x Un for 20ms found in the UK standard RIA12 and lower dips to 12V for
100ms found in the French standard NF F 01-510.
Figure 1 summarises this. The ranges of voltages for the French standard NF F 01-510 and for the USA are also shown for information. Additionally, according to EN
50155, complete interruptions of the supply can last for up to 10ms (Class S2) or 30ms during supply changeover (Class C2).
Figure 1 - Summary of nominal voltages and variations for rail applications
Tables 1, 2 and 3 show how the RUW15 can be configured to cover all of these requirements:
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