NDTD Series www.murata-ps.com Isolated 3W Wide Input Dual Output DC-DC Converters SELECTION GUIDE Output current 3 MTTF Min. Order code Full load 1 Load V (Nom.) V mA mA mA % pF kHrs NDTD0505C 5 5 75 300 804 72 31 1640 NDTD0512C 5 12 31 125 764 76 36 1625 FEATURES NDTD0515C 5 15 25 100 773 75 34 1609 NDTD1205C 12 5 75 300 321 75 29 1665 Industry standard footprint NDTD1212C 12 12 31 125 311 78 32 1650 2:1 Input range, 3W output power, minimum NDTD1215C 12 15 25 100 310 78 36 1633 3:1 input range with power derating to 2W NDTD2405C 24 5 75 300 156 78 30 1675 NDTD2412C 24 12 31 125 148 82 35 2075 Dual isolated output NDTD2415C 24 15 25 100 146 82 41 2080 Short circuit protection NDTD4805C 48 5 75 300 79 76 30 1669 NDTD4812C 48 12 31 125 76 80 35 2090 Operating temperature range -40C to 85C NDTD4815C 48 15 25 100 75 81 36 2045 Load and line regulation <1% on both Recommended outputs Alternative NDTD0503C 5 3.3 113 454 890 67 30 1644 Contact Murata No heatsink required NDTD1203C 12 3.3 113 454 343 73 30 1668 Contact Murata 1kVDC isolation Hi Pot Test NDTD2403C 24 3.3 113 454 170 73 30 1671 Contact Murata NDTD4803C 48 3.3 113 454 86 72 30 1667 Contact Murata 5V, 12V, 24V & 48V Input 5V, 12V & 15V Output INPUT CHARACTERISTICS Internal SMD construction Parameter Conditions Min. Typ. Max. Units 5V input types 4.5 5 9 Fully encapsulated 12V input types 9 12 18 Voltage range VDC 24V input types 18 24 36 DESCRIPTION 48V input types 36 48 75 The NDTD series is a range of low prole DC-DC 5V input types 40 90 4 Reected ripple current mA p-p converters offering dual outputs over a 2:1 input 12V, 24V & 48V input types 30 40 voltage range. All parts deliver 3W output power up to 85C without heatsinking. A yback oscilla- ABSOLUTE MAXIMUM RATINGS tor design with isolated feedback is used to give Short-circuit protection 8 hours regulation over the full operating range of 25% to Lead temperature 1.5mm from case for 10 seconds 300C 100% of full load. It is strongly recommended that 1 Minimum output load for specication 25% of rated output external capacitors be used on input and output Input voltage 5V types 10V to guarantee performance over full load and input Input voltage 12V types 20V voltage range (see application notes for guidance). Input voltage 24V types 40V The plastic case is rated to UL94V-0 and encap- Input voltage 48V types 80V sulant to UL94V-1 and the connection pins are Free air space 10mm Min. around component formed from a tin plated alloy 42 leadframe. 1. Please refer to minimum load application note section on page 4. 2. Measured at full load with external input/output capacitors, refer to test circuit. 3. Calculated using MIL-HDBK-217F with nominal input voltage at full load (ground benign) at 25C. 4. Please refer to reected ripple current measurement circuit on page 3. All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KDC NDTD.G01 Page 1 of 7 Input voltage Rated output voltage Input current full load 2 Efciency (Min.) Isolation capacitanceNDTD Series Isolated 3W Wide Input Dual Output DC-DC Converters OUTPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units 5V outputs 2 5 Voltage set point accuracy With external input/output capacitors % 12V & 15V outputs 1 3 Line regulation Low line to high line with external input/output capacitors 0.15 0.5 % 5V outputs 0.5 1.0 % 25% load to 100% load with external input/output Load regulation capacitors with balanced load 12V & 15V outputs 0.2 0.5 % Ripple BW = 20Hz to 300kHz with external input/output capacitors 15 40 mV rms Ripple & noise BW = DC to 20MHz with external input/output capacitors 90 150 mV p-p NDTD05XXC, NDTD1205C, 5.0 NDTD2405C, NDTD4805C % voltage change on negative output when Cross regulation positive load varies from 12% to 50% of 3W rating, % with negative load xed at 50% NDTD1212C, NDTD1215C, NDTD2412C, NDTD2415C, 2.1 3.0 NDTD4812C, NDTD4815C Short circuit protection Continuous GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency 100% to 25% load, VIN min to max 60 620 kHz TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Operation -40 85 Storage -50 130 NDTD0505C, NDTD0512C, NDTD1205C, NDTD2405C, NDTD4805C 35 C Case temperature rise above NDTD0515C, NDTD1212C, NDTD1215C, NDTD2412C, NDTD4812C, NDTD2415C, ambient in still air 28 NDTD4815C ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation voltage Flash tested for 1 second 1000 VDC Resistance Viso=1KVDC 1 G 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 specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions NDTD series of DC-DC converters are all 100% production tested at their 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 specic agency approvals, such as the NDTD 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 NDTD 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 specied 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. www.murata-ps.com/support KDC NDTD.G01 Page 2 of 7