NDH Series www.murata-ps.com Isolated 3W Dual Output DC/DC Converters Isolation Capacitance Min Load3 Full Load Efficiency (MIN.) Order Code Output Current Input Current2 Input Voltage Rated Output Voltage SELECTION GUIDE 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 Alternative Obsolete RoHS compliant 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 current foldback INPUT CHARACTERISTICS Operating temperature range –40°C to +85°C 0.5% Load Regulation 1kVDC Isolation Parameter Voltage range Reflected ripple current Shutdown Power 24V & 48V nominal input Conditions All NDH24 types All NDH48 types All NDH24 types when 10μF at input All NDH48 types when 10μF at input VIN Nominal 24XX VIN Nominal 48XX 12V & 15V Output OUTPUT CHARACTERISTICS Power density 1.00W/cm3 Parameter Conditions Voltage set point accuracy With external input/output capacitors Low line to high line with external input/ Line regulation output capacitors Minimum load to rated load with external Load regulation input/output capacitors BW = 20Hz to 300kHz with external input/ Ripple output capacitors Ripple & noise BW = DC to 20MHz with external input/ output capacitors Remote on/off No electrolytic capacitors Low noise PRODUCT OVERVIEW The NDH series is a range of high performance miniature DC/DC converters having regulated outputs over the wide temperature range of –40°C to +85°C. The input voltage range is 2:1 and the input to output isolation is 1kVDC. Continuous short circuit protection, external control and extremely small SIP packaging provide state of the art functionality. The use of ceramic capacitors and a ceramic substrate, and SMD construction, provide genuine high reliability. Nominal input voltages of 24 and 48V with output voltages of 12 and 15V are available as standard with custom parts on request. The plastic case is rated to UL 94V-0 with encapsulant to UL 94V-1. Cross regulation % voltage change on negative output when positive load varies from 12% to 50% with negative load fixed at 50% MIN. 18 36 MIN. TYP. 24 48 200 105 8 16 MAX. 36 72 250 150 Units TYP. ±1 MAX. ±5 Units % 0.05 0.2 % 0.2 0.5 % 15 30 mV rms 90 150 mV p-p 2.1 5.0 % V mA p-p mW ABSOLUTE MAXIMUM RATINGS Short-circuit protection Lead temperature 1.5mm from case for 10 seconds Minimum output load for specification3 Control pin input current Input voltage 24 types1 Input voltage 48 types1 Free air space Continuous 300°C 25% of rated output 15mA 40V 80V 10mm MIN. around component 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. 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 specification transiently during power down when the input voltage also falls below its rated minimum. All specifications typical at TA=25°C, 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_NDH.C02 Page 1 of 4 NDH Series Isolated 3W Dual Output DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Specification Operation Storage Case temperature rise above ambient Conditions MIN. -40 -40 -50 TYP. 12V & 15V output types @ 100% load MAX. 85 100 130 36 Units °C MTTF (MEAN TIME TO FAILURE) Part Number NDH2412SC NDH2415SC NDH4812SC NDH4815SC MTTF 2077 2080 2090 2045 GENERAL CHARACTERISTICS Parameter Conditions Control pin (CTRL) input current Please refer to control pin application note Units Conditions Calculated using MIL-HDBK 217F with Nominal input at full voltage (ground benign) at 25°C. kHrs MIN. TYP. 6 MAX. Units 15 mA Load causing lowest frequencies, 100% load VIN MIN. 100 125 150 Load causing highest frequencies, 25% load VIN MAX. 300 400 500 TYP. MAX. kHz Switching frequency ISOLATION CHARACTERISTICS Parameter Conditions MIN. Isolation test voltage Resistance Flash tested for 1 second VISO = 1000VDC 1000 1 Units VDC GΩ 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 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 specific 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 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. www.murata-ps.com/support KDC_NDH.C02 Page 2 of 4 NDH Series Isolated 3W Dual Output 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 characterized using the following values and test circuit. Value CIN 10μF, 200V COUT 47μF, 25V Test circuit +VOUT COUT +VIN NDH CIN OV -VIN COUT -VOUT Control Pin The NDH converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an internal transistor, and the switch off mechanism for the NDH works by forward biasing this NPN transistor. If the pin is left open (high impedance), the converter will be ON (there is no allowed low state for this pin), but once a control voltage is applied with sufficient drive current, the converter will be switched OFF. A suitable application circuit is shown below. NDH VIN R2 VC OV -VIN R1 D1 CTRL Q1 D1 (eg 1N4001) is required to provide high impedence when the signal is low. From the NDH specification, the drive current to operate this function is recommended to be 6mA, and hence the value of R1 can be derived as follows: R1 = VC - VD - VQ IC Assuming VC=5V, VD=0.7V and VQ=1V: R1= 5 - 0.7 - -31.0 = 550Ω 6 x 10 Cross Regulation Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the positive output. To meet ripple specification a total minimum load of 25% full load is required, however, the NDH can be used with much lighter loading at the expense of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded. Cross regulation is defined as change in the negative output voltage as a percentage of nominal as the positive output load is changed from 12.5% to 50% with the negative load is fixed at 50% of full load. RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300ºC for 10 seconds. The pin termination finish on this product series is Tin Plate, Hot Dipped over Matte Tin with 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_NDH.C02 Page 3 of 4 NDH Series Isolated 3W Dual Output DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS 1.02 (25.95) 0.36 (9.25) 0.49 (12.45) NDH2412SC XYYWW 1 2 3 0.181(4.60) 0.142(3.60) 6 7 8 9 0.3 (7.62) Pin 1 2 3 6 7 8 9 Function -VIN +VIN CTRL +VOUT 0V N/A -VOUT Package weight: 6.5g 0.1 (2.54) N/A - Not available for electrical connection 0.16 (4.05) 0.107±0.02 (2.73±0.5) 0.022 (0.55) 0.018 (0.45) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 0.012 (0.30) 0.008 (0.20) All pins on a 0.1(2.54) pitch and within ±0.01(0.25) of true position. Unless otherwise stated all dimensions in inches(mm) ±0.01(0.25). 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_NDH.C02 Page 4 of 4