ndh series isolated 3w dual output dc/dc converters kdc_ndh.c02 page 1 of 4 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ selection guide order code input voltage rated output voltage output current input current 2 ef?ciency (min.) isolation capacitance min load 3 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 obsolete recommended alternative ndh4812sc 48 12 32 125 78 78 40 contact murata ndh4815sc 48 15 25 100 78 78 40 contact murata input characteristics parameter conditions min. typ. max. units voltage range all ndh24 types 18 24 36 v all ndh48 types 36 48 72 re?ected ripple current all ndh24 types when 10f at input 200 250 ma p-p all ndh48 types when 10f at input 105 150 shutdown power v in nominal 24xx 8 mw v in nominal 48xx 16 output characteristics parameter conditions min. typ. max. units voltage set point accuracy with external input/output capacitors 1 5 % line regulation low line to high line with external input/ output capacitors 0.05 0.2 % load regulation minimum load to rated load with external input/output capacitors 0.2 0.5 % ripple bw = 20hz to 300khz with external input/ output capacitors 15 30 mv rms ripple & noise bw = dc to 20mhz with external input/ output capacitors 90 150 mv p-p cross regulation % voltage change on negative output when positive load varies from 12% to 50% with negative load ?xed at 50% 2.1 5.0 % absolute maximum ratings short-circuit protection continuous lead temperature 1.5mm from case for 10 seconds 300c minimum output load for speci?cation 3 25% of rated output control pin input current 15ma input voltage 24 types 1 40v input voltage 48 types 1 80v free air space 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 speci?cation transiently during power down when the input voltage also falls below its rated minimum. all speci?cations typical at t a =25c, nominal input voltage and rated output current unless otherwise speci?ed. features ? rohs compliant ? compact sip form factor ? 2:1 wide range voltage input ? continuous short circuit protection with current foldback ? operating temperature range C40c to +85c ? 0.5% load regulation ? 1kvdc isolation ? 24v & 48v nominal input ? 12v & 15v output ? power density 1.00w/cm 3 ? remote on/off ? no electrolytic capacitors ? low noise product overview the ndh series is a range of high perfor- mance miniature dc/dc converters having regulated outputs over the wide temperature range of C40c to +85c. the input voltage range is 2:1 and the input to output isolation is 1kvdc. continuous short circuit protec- tion, external control and extremely small sip packaging provide state of the art function- ality. 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.
ndh series isolated 3w dual output dc/dc converters kdc_ndh.c02 page 2 of 4 www.murata-ps.com/support temperature characteristics parameter conditions min. typ. max. units speci?cation -40 85 c operation -40 100 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 khrs calculated using mil-hdbk 217f with nominal input at full voltage (ground benign) at 25c. NDH2415SC 2080 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 switching frequency load causing lowest frequencies, 100% load v in min. 100 125 150 khz load causing highest frequencies, 25% load v in max. 300 400 500 isolation characteristics parameter conditions min. typ. max. units isolation test voltage flash tested for 1 second 1000 v dc resistance v iso = 1000v dc 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 speci?ed time, across a component designed to provide electrical isolation, to verify the integrity of that isola tion. 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 speci?c agency approvals, such as the ndh series, both input and output should normally be maintained wit hin 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 a n 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; bu t 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 circui ts 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 secondar y 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 m aterial, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tes ts 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% fr om speci?ed 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.
ndh series isolated 3w dual output dc/dc converters kdc_ndh.c02 page 3 of 4 www.murata-ps.com/support 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 ?nish 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 application notes external capacitance although these converters will work without external capacitors, they are neces- sary 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 c in c out 10f, 200v 47f, 25v test circuit 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 suf?cient drive current, the conver ter will be switched off. a suitable application circuit is shown below. d 1 (eg 1n4001) is required to provide high impedence when the signal is low. from the ndh speci?cation, the drive current to operate this function is recommended to be 6ma, and hence the value of r 1 can be derived as follows: r 1 = assuming v c =5v, v d =0.7v and v q =1v: r 1 = = 550 cross regulation load regulation is at its best when the positive and negative loads are balanced. when the loads are asymmetric, the negative o utput is not as tightly regulated as the positive output. to meet ripple speci?cation a total minimum load of 25% full load is required, however, the ndh can be used wi th 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 de?ned as change in the negative output voltage as a percentage of nominal as the positive output load is c hanged from 12.5% to 50% with the negative load is ?xed at 50% of full load. ndh v in v c ov -v in ctrl r 1 d 1 q 1 r 2 v c - v d - v q i c 5 - 0.7 - 1.0 6 x 10 -3 ndh +v in +v out -v out ov c out c out c in -v in
ndh series isolated 3w dual output dc/dc converters kdc_ndh.c02 page 4 of 4 www.murata-ps.com/support 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 her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci?cations are subject to chan ge without notice. ? 2013 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans?eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered 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/ package specifications mechanical dimensions pin connections pin function 1-v in 2+v in 3 ctrl 6+v out 70v 8 n/a 9-v out package weight: 6.5g n/a - not available for electrical connection 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). 1.02 (25.95) 0.36 (9.25) 0.49 (12.45) 0.181(4.60) 0.142(3.60) 0.3 (7.62) 0.1 (2.54) 0.16 (4.05) 0.1070.02 (2.730.5) 0.022 (0.55) 0.018 (0.45) 0.012 (0.30) 0.008 (0.20) ndh2412sc xyyww 12 3 6 789
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