NDW3 Series NDW www.murata-ps.com OBSOLETE Isolated 3W Ultra Wide Input Sin Single DC/DC DC Converters SELECTION GUIDE Order Code Input Voltage Output Voltage V (Nom.) V 36 12 NDW3S3612C Input Current Output Current Efficiency Minimum Maximum (Min.) 0% Load 100% Load Load Load mA mA mA mA % 8 104 62.5 250 79 MTTF1 kHrs 1000 INPUT CHARACTERISTICS Parameter Voltage range Reflected ripple current Conditions Min. Typ. Max. Units 60 V mA p-p Typ. Max. Units ±2 0.03 0.05 3 ±2.5 0.2 0.2 W % % % 9 36V input with 10μF at input 60 FEATURES RoHS compliant OUTPUT CHARACTERISTICS 7:1 Wide range voltage input, 9-60VDC Rated power Voltage set point accuracy Line regulation Load regulation With external input/output capacitors Low line to high line 25% total load to 100% load Ripple BW=20Hz to 300kHz, with external input/output capacitors 20 30 mVrms Noise BW=DC to 20MHz, with external input/output capacitors 70 150 mVp-p Typ. Max. Units Parameter Operating temperature range –40°C to 85°C 0.05% Typical load regulation 1kVDC Isolation Efficiency from 79% at 36VIN Conditions Min. UL 94V-0 Package materials ISOLATION CHARACTERISTICS Low noise Parameter Conditions Min. Isolation test voltage Resistance Capacitance Flash tested for 1 second Viso = 1kVDC 1000 1 PRODUCT OVERVIEW The NDW3 series is particularly suitable for use in applications in railway, industry or telecommunication where variable input voltages are present. With an ultra wide input voltage range of 9-60VDC, the NDW3 series is suitable for use with nominal 12V, 24V or 48V systems. The NDW3 is housed in an industry standard package with a standard pinout. The NDW3 is packaged in a metal case for improved EMI shielding and is also encapsulated for superior thermal performance.. VDC GΩ pF 190 GENERAL CHARACTERISTICS1 Parameter Conditions Switching frequency 100% load to 25% total load Min. Typ. 20 Max. Units 260 kHz Max. Units TEMPERATURE CHARACTERISTICS Parameter Operation Storage Case temperature rise above ambient Conditions Min. Typ. -40 -50 100% Load, Nom VIN, still air 85 125 °C 16 ABSOLUTE MAXIMUM RATINGS Short-circuit protection Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C) Minimum output load for specification Momentary 260°C 25% of rated load 1. Calculated using MIL-HDBK-217F FN2 with nominal input voltage at full load at TA = 25ºC. All specifications typical at TA=25°C, with recommended input/output capacitors (refer to application note), nominal input voltage and rated output current unless otherwise specified. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KDC_NDW3.B01 Page 1 of 4 NDW3 Series Isolated 3W Ultra Wide Input Single DC/DC Converters APPLICATION NOTES External Capacitance Although these converters will work without external capacitors, they are necessary in order to guarantee the full parametric performance over the full line and load range. All parts have been tested and characterised using the following values and test circuit. Value CIN 10μF, 100V COUT1 10μF low ESR Electrolytic Recommended Input & Output Capacitors +VIN +VOUT COUT1 NDW3 CIN -VIN -VOUT Output load The minimum load for correct operation is 25% of the full rated load across the specified input voltage range. Lower loads may cause a significant increase in output ripple and may cause the output voltage to exceed its specification transiently during power-down when the input voltage also falls below its rated minimum. TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions NDW3 series is 100% production tested at the stated isolation voltage. This is 1kVDC for 1 second. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” For a part holding no specific agency approvals, such as the NDW3 series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. The NDS3 series has an EI ferrite core, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. 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. For further information, please visit www.murata-ps.com/rohs www.murata-ps.com/support KDC_NDW3.B01 Page 2 of 4 NDW3 Series Isolated 3W Ultra Wide Input Single DC/DC Converters CHARACTERISATION TEST METHODS Ripple & Noise Characterisation Method Ripple and noise measurements are performed with the following test configuration. C1 C2 C3 R1 R2 T1 RLOAD 1uF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter 10uF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less than 100mΩ at 100 kHz 100nF multilayer ceramic capacitor, general purpose 450Ω resistor, carbon film, +/-1% tolerance 50Ω BNC termination 3T of the coax cable through a ferrite toroid Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires Measured values are multiplied by 10 to obtain the specified values. Differential Mode Noise Test Schematic DC/DC Converter OSCILLOSCOPE C1 C2 C3 + SUPPLY Input - + R1 T1 R2 Y INPUT Output - R LOAD www.murata-ps.com/support KDC_NDW3.B01 Page 3 of 4 NDW3 Series Isolated 3W Ultra Wide Input Single DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS Pin 1.26 (32.00) 0.98 (25.00) Function 1 -VIN 2 +VIN 4 +VOUT 6 -VOUT NDW3S3612C XYYWW RECOMMENDED FOOTPRINT DETAILS 0.069 (1.75) Ø 0.063 (1.60) 0.1 (2.54) 0.394 (10.00) 4 HOLES 0.189 (4.8) 0.157 (4.0) 0.00394 (0.1) Ø 0.041 (1.04) 0.035 (0.90) 0.1 (2.54) 4 2 0.2 (5.08) 0.80 (20.32) 1 0.392 (9.96) All dimensions in inches ±0.010 (mm 0.25mm). TUBE OUTLINE DIMENSIONS 6 0.23 (5.84) 0.8 (20.32) * Optional pin All dimensions in inches ±0.010 (mm 0.25mm). All pins on a 0.100 (2.54) pitch and within 0.010 (0.25) of true position. Weight: 20g The copper case is connected to the output (-VOUT) pin. Care is needed in the design of this circuit board on which the converter is mounted. Top side tracks must not contact the edge of the case on the underside of the unit. 0.092 (2.34) All dimensions in inches ±0.010 (mm 0.25mm), unless specified otherwise. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED Quantity: 15 This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ 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. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support KDC_NDW3.B01 Page 4 of 4