RUW15 Series. Isolated Ultra-Wide Input DC-DC Converters. FEATURES DESCRIPTION

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1 SELECTION GUIDE Order Code 1 Output Output Current Output Power Input Voltage MTTF Voltage Min. Max. Max. 3 Nom. V A A W khrs RUW15SL5C SL RUW15SL5HC SL RUW15SL1C SL RUW15SL1HC SL RUW15SLC SL RUW15SLHC SL FEATURES UL 9 recognised for reinforced insulation High transient voltage withstand capability Ultra wide input voltage range of 1-1VDC Externally settable hold up time with additional capacitor DC OK/Power Fail signal Short circuit protection Over Temperature protection Over voltage protection DESCRIPTION The RUW series is particularly suitable for use in applications in railway, industry or telecommunication where variable input voltages or high transient voltages are present. With an ultra wide input voltage range of 1-1VDC, the RUW series is capable of withstanding surges from,3,8,7, 9 and 1V 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. INPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Voltage range Continuous operation SL I/P types 1 1 V Input standby current 5.5 ma INPUT CURRENT (% Load) Order Code Input Voltage Units V RUW15SL5C RUW15SL5HC RUW15SL1C RUW15SL1HC A RUW15SLC RUW15SLHC INPUT REFLECTED RIPPLE Order Code Input Voltage Units V RUW15SL5C RUW15SL5HC RUW15SL1C RUW15SL1HC map-p RUW15SLC RUW15SLHC EFFICIENCY Input Voltage Order Code Min. Typ. Min. Typ. Min. Typ. Min. Typ. Min. Typ. RUW15SL5C RUW15SL5HC RUW15SL1C RUW15SL1HC RUW15SLC RUW15SLHC Units V % For full details go to 1. Part numbers ending HC include optional Power Fail /DC OK signal and circuitry to facilitate long hold up time.. Will operate down to 1V for ms as required by EN 155 (V system). 3. Using Telecordia Issue 1 method I case 1 operating temperature 5C All specifications typical at TA=5 C and rated output current unless otherwise s KDC_RUW15.D1 Page 1 of 13

2 OUTPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Voltage set point accuracy 5V output.55 1V & V output ±%VOUT Overall voltage envelope 3. ±%VOUT RUW15SL1C.5 Line regulation RUW15SL1HC, RUW15SLHC & RUW15SL5HC. ±% RUW15SLC, RUW15SL5C 1 Load regulation -% Load 1V & V output.5 5V output 1 ±% Ripple & noise 5V output 8 BW = MHz 1V output (VIN to 1VIN) V output 9 mvp-p Transient response Peak deviation (-% & -% swing) 3. %VOUT Settling time 1.5 ms Start delay Overvoltage protection Short circuit protection From remote on/off RUWSLXXC From application of VIN RUWSLXXC 5V output 1% 1V & V output 1% Continuous GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency khz Module on OPEN Remote on/off pin functionality 1V & V output.5 Module off 5V output.8 V ABSOLUTE MAXIMUM RATINGS Input voltage, SL input types 1V Remote On/Off V ±5V ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation test voltage Flash tested for 1 second VDC Resistance VISO = VDC GΩ 5VOUT types Capacitance 1VOUT types pf VOUT types 7 ENVIRONMENTAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Ambient temperature See derating graph - 85 Storage - 15 Thermal protection Operates at case temperature 1 C Case temperature rise above ambient 5 V % load, still air, see derating graph 5 1V, V % load, still air, see derating graph ms VOUT KDC_RUW15.D1 Page of 13

3 SAFETY UL 9 The RUW15 series has been recognised by Underwriters Laboratory (UL) to UL 9 for reinforced insulation to a working voltage of Vrms 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 E1515 applies. RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of ºC for seconds. The pin termination finish on this product series is a Gold flash (.5-. 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. APPLICATION NOTES For further information, please visit 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 uf. 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) Max. Recommended Output Capacitance (µf) 5 1 Remote ON/OFF control The remote ON/OFF input to the RUW15 converter is referenced to the primary ground and when pulled below.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 nf 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 8 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, EN155 requirement to maintain output for ms on supply change-over (Class C) is met with a capacitor of uf rated at V for any nominal input voltage up to 1 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 ms holdup with a capacitor across the input in a V nominal system, an expensive and large capacitor of 39uF 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. ms 5v 1v v 1 µf KDC_RUW15.D1 Page 3 of 13

4 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 1 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 ma and withstand the inactive condition. The signal is referenced to RUW15 -Vout and typically is pulled to a system rail with a K 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 RUW15SL1HC Power Fail minimum ms. RUW15SLHC Power Fail minimum Advance Power Fail time (ms) Capacitance uf Advance Power Fail time (ms) Capacitance uf RUW15SL5HC Power Fail minimum ms. Advance Power Fail time (ms) RUW15SLHC 1 3 Capacitance uf KDC_RUW15.D1 Page of 13

5 SURGE SUPPRESSION EN155/RIA1 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 155:7. This standard defines a range of nominal battery voltages that may be encountered with possible fluctuations and interruptions. Nominal voltages (Un) are V, 8V, 7V, 9V and 1VDC with tolerances of -/+5%. Fluctuations can take the nominal voltages up +% for one second and down -% for ms. The possible total range of nominals and fluctuations is therefore 1.V to 15V (V -% to 1V +%). Other national variations include US rail nominal battery voltages of 37V and 7V; higher surges of 1.5 x Un for one second and 3.5 x Un for ms found in the UK standard RIA1 and lower dips to 1V for ms found in the French standard NF F 1-5. Figure 1 summarises this. The ranges of voltages for the French standard NF F 1-5 and for the USA are also shown for information. Additionally, according to EN 155, complete interruptions of the supply can last for up to ms (Class S) or ms during supply changeover (Class C). Figure 1 - Summary of nominal voltages and variations for rail applications Tables 1, and 3 show how the RUW15 can be configured to cover all of these requirements: Table 1 - RIA1 SURGES AND TRANSIENTS Nominal Input V Input range 1. - V Brown-out ms (.xvin) Transient 1s (1.5xVin) Transient ms (3.5 x Vin) Solution 1.V 3V 8V RUW15H 37.5 V - 7V.5V 5.5V 131.5V RUW15 8 V 7 V 9 V 1 V V.V - 9V V V 8.8V 7V 18V RUW15 3.V 11.5V 5V 57.V 1V 33V V 15V 385V RUW15 + limiter RUW15 + limiter RUW15 + limiter Table - EN155 SURGES AND TRANSIENTS Nominal Input Input range Brown-out ms (.xvin) Transient 1s (1.xVin) Solution V 1. - V 1. V 33. V RUW15H 37.5 V - 7 V.5 V 5.5 V RUW15 8 V V 8.8 V 7. V RUW15 7 V.V - 9 V 3. V.8 V RUW15 9 V V 57. V 13. V RUW15 1 V V V 15 V RUW15 KDC_RUW15.D1 Page 5 of 13

6 SURGE SUPPRESSION (continued) Table 3 - NF F 1-5 SURGES AND TRANSIENTS Nominal Input Input range Brown-out ms (.5xVin) Transient ms Solution V 18-3 V 1V V RUW15H 7 V - 9 V 3V 115V RUW15 1 V V 55V 17V RUW15 + limiter EN 155 also defines low energy surges and transient burst immunity requirements according to EN These are handled by a transorb, D in Figure. D is for reverse polarity protection and may be omitted if this function is not required. Figure Suggested surge limiting circuit R7 Vin R1 D Q1 Q Vo R5 R D R D R9 R11 R1 R R8 C1 Q3 C R U1 R3 D1 D3 D5 V This circuit has been evaluated successfully over temperature for nominal 1 VDC input worst case 3.5 Vnom surge as specified in RIA1. Waveforms obtained are shown in Figures 3. Suggested component values for 1put are given in Table. Figure 3 Response to 3.5 x Vnom surge with circuit of Figure KDC_RUW15.D1 Page of 13

7 SURGE SUPPRESSION (continued) TABLE. SUGGESTED SURGE LIMITER COMPONENTS 1VDC NOMINAL Ref Description Ref Description Ref Description Ref Description C1 CAPACITOR 7uF V D5 DIODE, ZENER,.7V,.5W, DO-35 C CAPACITOR, DISC, V, 39PF D1, D D3 DIODE, ZENER, 15V, 1.3W, 5%, DO1 DIODE, ZENER, 5.1V, MW, DO-35 D DIODE, TVS, V, 1.5KW R, R8 RESISTOR, CARBON FILM, K,.5W, 5% D DIODE, 3A, V R3 RESISTOR, K,.5W, 1% Q1, Q Q3 R1 MOSFET, P, TO- R RESISTOR,.5W 5% 5K MOSFET,N CH, V,.5A,TO9 RESISTOR, CARBON FILM, K7,.5W, 5% R5 RESISTOR,.5W 1% K R, R11 RESISTOR,.5W 1% 3K R7 RESISTOR, SURGE, 33R, W, V, 5% R9 R RESISTOR, K,.5W, 1% RESISTOR, CARBON FILM, 1K,.5W, 5% R1 RESISTOR, SURGE, R, W, V, 5% U1 SHUNT REG ADJ +.5/3V, TO9-3, 31 KDC_RUW15.D1 Page 7 of 13

8 EMC FILTERING AND SPECTRA FILTERING The module includes a basic level of filtering, sufficient for many applications. Where lower noise levels are desired, filters can easily be added to achieve any required noise performance. A DC-DC converter generates noise in two principle forms: that which is radiated from its body and that conducted on its external connections. There are three separate modes of conducted noise: input differential, output differential and input-output. This last appears as common mode at the input and the output, and cannot therefore be removed by filtering at the input or output alone. The first level of filtering is to connect capacitors between input and output returns, to reduce this form of noise. It typically contains high harmonics of the switching frequency, which tend to appear as spikes on surrounding circuits. The voltage rating of this capacitor must match the required isolation voltage. (Due to the great variety in isolation voltage and required noise performance, this capacitor has not been included within the converter.) Input ripple is a voltage developed across the internal Input decoupling capacitor. It is therefore measured with a defined supply source impedance. Although simple series inductance will provide filtering, on its own it can degrade the converter stability. A shunt capacitor is therefore recommended across the converter input terminals, so that it is fed from a low impedance. If no filtering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capacitor for stability. An electrolytic type will perform well in these situations. The input-output filtering is performed by the common-mode choke on the primary. This could be placed on the output, but would then degrade the regulation and produce less benefit for a given size, cost, and power loss. The metallic case of the product is connected internally to output V and as such also has reinforced isolation to the input. Tinned tabs on the casing may be soldered to PCB slots to provide mechanical support and extra electrical connection to the casing to optimise EMC shielding. Rail standard EN155 references EN11-3- for conducted EMI which is less severe than EN511 so the RUW15 also meets these levels comfortably. The RUW15 has been evaluated to meet the requirements of EN511 curve B with an external filter as shown. The limit line shown is quasi peak curve B. EMC FILTER AND VALUES TO OBTAIN SPECTRA AS SHOWN The following filter circuit shows the input filter typically required to meet CISPR Quasi-PeakCurve B. L1 C1 C C3 DC DC C1, C3 1μF Polyester or ceramic capacitor C μf Electrolytic capacitor C & C5.7nF VAC Y Rated L1.7µH Common-mode choke (Murata part number 5C) C5 C KDC_RUW15.D1 Page 8 of 13

9 EMC FILTERING AND SPECTRA RUW15SL5C = 8V = 8V 8 1.E+5 1.E+ 1.E+7 1.E+8 8 = 8V 1.E+5 1.E+ 1.E+7 1.E+8 = 1V RUW15SL5HC = 8V = 1V 8 1.E+5 1.E+ 1.E+7 1.E+8 RUW15SL1C = 8V 8 1.E+5 1.E+ 1.E+7 1.E+8 = 1V 8 1.E+5 1.E+ 1.E+7 1.E+8 RUW15SL1HC = 8V 8 1.E+5 1.E+ 1.E+7 1.E+8 = 1V KDC_RUW15.D1 Page 9 of 13

10 EMC FILTERING AND SPECTRA 8 1.E+5 1.E+ 1.E+7 1.E+8 RUW15SLC = 8V 8 1.E+5 1.E+ 1.E+7 1.E+8 = 1V 8 1.E+5 1.E+ 1.E+7 1.E+8 RUW15SLHC = 8V 8 1.E+5 1.E+ 1.E+7 1.E+8 = 1V KDC_RUW15.D1 Page of 13

11 THERMAL DERATING GRAPHS RUW15SL5C RUW15SL5HC Available power 8 still air lfm lfm lfm Available power 8 still air lfm lfm lfm Ambient temperature Ambient temperature RUW15SLC RUW15SLHC Available Power still air lfm lfm lfm Available Power 1 8 still air lfm lfm lfm RUW15SLC RUW15SLHC Available Power still air 88 lfm lfm lfm Available Power still air lfm lfm lfm KDC_RUW15.D1 Page 11 of 13

12 EFFICIENCY GRAPHS RUW15SL5C RUW15SL5HC Efficiency (%) 1V V 8V 7V Efficiency (%) V 8V 7V 1V 8 9 Load (%) 8 9 Load (%) RUW15SL1C 9 RUW15SL1HC 9 Efficiency (%) 8 9 1V V 8V 7V Efficiency (%) 8 9 V 8V 7V 1V Load (%) Load (%) RUW15SLC 9 RUW15SLHC 9 Efficiency (%) V 8V 7V 1V Efficiency (%) V 8V 7V 1V Load (%) Load (%) KDC_RUW15.D1 Page 1 of 13

13 PACKAGE SPECIFICATONS Mechanical Dimensions 51. (.1) PIN CONNECTIONS Pin Function 1 REMOTE ON/OFF * -VINT 3 * +VINT -VIN 5 +VIN PF/DC OK * 7 +VOUT 8 -VOUT Remote ON/OFF is referenced to input. 51. (.1). (.87).8 (.1) 11. (.1). (1.57) 8. (1.) 3.9 (1.35).8±. (.19±.) (.79) RECOMMENDED FOOTPRINT DETAILS * Optional pins. [.8] 3.81 [.1] 9.5 (.37) 8.5 [.35] 3.81 (.15) 7. (.3) 11.3 (.5) 11.3 (.5) * * * 19.5 (.751) 7. (.3). [1.99] x8 HOLES Ø1. [Ø.3] x HOLES Ø. [Ø.] 3.81 [.1] 8.55 (.337) 1 8. [1.] bottom view *Optional pins All dimensions in mm ±.5 (inches ±.) unless otherwise specified. Weight: 5g Typ. All pins on a 3.81 (.15) pitch and within ±.5 (.1) of true position. Unless otherwise stated all dimensions are in mm (inches) ±.5 (.1). This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. 18 Murata Power Solutions, Inc. KDC_RUW15.D1 Page 13 of 13