NDH Series www.murata-ps.com Isolated 3W Dual Output DC/DC Converters SELECTION GUIDE Output Current 3 Order Code Min Load Full Load V (NOM.) V mA mA mA % pF NDH2412SC 24 12 32 125 157 81 36 NDH2415SC 24 15 25 100 155 82 36 FEATURES Recommended Obsolete RoHS compliant Alternative Compact SIP form factor NDH4812SC 48 12 32 125 78 78 40 Contact Murata 2:1 Wide range voltage input NDH4815SC 48 15 25 100 78 78 40 Contact Murata Continuous short circuit protection with INPUT CHARACTERISTICS current foldback Parameter Conditions MIN. TYP. MAX. Units Operating temperature range All NDH24 types 18 24 36 Voltage range V 40C to +85C All NDH48 types 36 48 72 All NDH24 types when 10F at input 200 250 0.5% Load Regulation Reected ripple current mA p-p All NDH48 types when 10F at input 105 150 1kVDC Isolation VIN Nominal 24XX 8 Shutdown Power mW VIN Nominal 48XX 16 24V & 48V nominal input 12V & 15V Output OUTPUT CHARACTERISTICS Parameter Conditions MIN. TYP. MAX. Units 3 Power density 1.00W/cm Voltage set point accuracy With external input/output capacitors 1 5 % Remote on/off Low line to high line with external input/ Line regulation 0.05 0.2 % output capacitors No electrolytic capacitors Minimum load to rated load with external Load regulation 0.2 0.5 % Low noise input/output capacitors BW = 20Hz to 300kHz with external input/ Ripple 15 30 mV rms PRODUCT OVERVIEW output capacitors The NDH series is a range of high perfor- Ripple & noise BW = DC to 20MHz with external input/ 90 150 mV p-p mance miniature DC/DC converters having output capacitors regulated outputs over the wide temperature % voltage change on negative output when range of 40C to +85C. The input voltage Cross regulation positive load varies from 12% to 50% with 2.1 5.0 % negative load xed at 50% range is 2:1 and the input to output isolation is 1kVDC. Continuous short circuit protec- tion, external control and extremely small SIP ABSOLUTE MAXIMUM RATINGS packaging provide state of the art function- Short-circuit protection Continuous ality. The use of ceramic capacitors and a Lead temperature 1.5mm from case for 10 seconds 300C 3 Minimum output load for specication 25% of rated output ceramic substrate, and SMD construction, Control pin input current 15mA provide genuine high reliability. Nominal input 1 Input voltage 24 types 40V voltages of 24 and 48V with output voltages 1 Input voltage 48 types 80V of 12 and 15V are available as standard with Free air space 10mm MIN. around component custom parts on request. The plastic case is rated to UL 94V-0 with encapsulant to UL 1. Absolute maximum value for 30 seconds. Prolonged operation may damage the product. 2. Measured at full load with external input/output capacitors. Refer to application note. 94V-1. 3. A lower load condition can be used but higher levels of output ripple may be experienced, this condition may also cause the output voltage to exceed its specication transiently during power down when the input voltage also falls below its rated minimum. 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 NDH.C02 Page 1 of 4 Input Voltage Rated Output Voltage Input 2 Current Efciency (MIN.) Isolation CapacitanceNDH Series Isolated 3W Dual Output DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions MIN. TYP. MAX. Units Specication -40 85 Operation -40 100 C Storage -50 130 Case temperature rise above ambient 12V & 15V output types 100% load 36 MTTF (MEAN TIME TO FAILURE) Part Number MTTF Units Conditions NDH2412SC 2077 NDH2415SC 2080 Calculated using MIL-HDBK 217F with Nominal kHrs input at full voltage (ground benign) at 25C. NDH4812SC 2090 NDH4815SC 2045 GENERAL CHARACTERISTICS Parameter Conditions MIN. TYP. MAX. Units Control pin (CTRL) input current Please refer to control pin application note 6 15 mA Load causing lowest frequencies, 100% load VIN MIN. 100 125 150 Switching frequency kHz Load causing highest frequencies, 25% load VIN MAX. 300 400 500 ISOLATION CHARACTERISTICS Parameter Conditions MIN. TYP. MAX. Units Isolation test voltage Flash tested for 1 second 1000 VDC Resistance VISO = 1000VDC 1G 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 NDH 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 NDH 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 NDH 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 NDH.C02 Page 2 of 4