kmp_772c_b04 page 1 of 3 772 series pulse transformers www.murata-ps.com www.murata-ps.com/support $ for full details go to www.murata-ps.com/rohs features ?? rohs compliant ?? inductance to 16.3mh ?? up to 482 vs et rating ?? pcb mounting ?? ul 94 v-0 package materials ?? up to 4000vrms isolation ?? backward compatible with sn/pb soldering systems description the 772 series of pulse transformers are intended for medium power applications in switch mode power supplies and thyristor/triac ? ring (e.g. motor control applications). the standard turns ratios may be modi? ed on any transformer with three windings by connecting any two windings in series. selection guide parameter order code units 77201c 77202c 77203c 77203hvc 77204c 77205C 77205sc 77206c 77207c 77208c 77209c turns ratio 1:1 1:1:1 2:1:1 2:1:1 1:1 1:1:1 1:1:1 2:1:1 1:1 1:1:1 2:1:1 primary inductance (min.) 1.0 1.0 1.0 1.0 4.0 4.0 4.0 4.0 16.3 16.3 16.3 mh primary et constant (min.) 120 120 120 120 240 240 240 240 482 482 482 vs leakage inductance (max.) 2.0 3.0 3.5 3.5 5.0 11 11 11 18 40 40 h interwinding capacitance (max.) 50 40 30 30 55 35 18 35 65 40 40 pf dc resistance (max.) primary winding 0.25 0.25 0.24 0.24 0.86 0.90 0.90 0.84 3.50 3.60 3.50 dc resistance (max.) secondary1 winding 0.23 0.22 0.12 0.12 0.83 0.76 0.76 0.38 3.40 3.10 1.60 dc resistance (max.) secondary2 winding - 0.28 0.15 0.15 - 1.10 1.10 0.50 - 4.20 2.00 isolation voltage (? ash tested for 1 second) 2.5 4.0 2.5 kvrms absolute maximum ratings operating free air temperature range 0c to 70c storage temperature range -60c to 125c lead temperature 1.5mm from case for 10 seconds 300c soldering information 1 peak wave solder temperature 300?c for 10 seconds pin ? nish matte tin with nickel pre-plate speci? cations typical at t a = 25c 1 for further information, please visit www.murata-ps.com/rohs at ur es
kmp_772c_b04 page 2 of 3 772 series pulse transformers www.murata-ps.com/support package specifications mechanical dimensions recommended footprint details tube dimensions pin connection style - 8 pin dip (top view) * only on 77205sc unless otherwise stated all dimensions in mm (inches) 0.25 (0.01). all dimensions in mm (inches) xx.x0.50(0.02), xx.xx0.25(0.01). all pins on a 2.54 (0.1) pitch . 13.30 (0.524) 0.750.12 (0.0300.005) 11.50 (0.453) 22.50 (0.886) tube length: 530 (20.87) max. unless otherwise stated all dimensions in mm (inches) 0.25 (0.01). 2.54 (0.1) ?1.20+0.15-0.00 (?0.472+0.006-0.000) 2.54 (0.1) 77202c yyww 1 2 3 4 5 6 25.40 (1.00) 20.30 (0.799) 5.92 (0.233) 12.5 (0.492) 12.30 (0.484) 15.24 (0.6) 5.08 (0.2) 5.08 (0.2) 0.66 (0.026) max. 2.53 (0.100) 20.32 (0.8) 3.05 (0.120) 1 2 3 4 5 6 primary secondary 1 secondary 2 screen*
kmp_772c_b04 page 3 of 3 772 series pulse transformers 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 cha nge without notice. ? 2011 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered www.murata-ps.com/support 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 isolation. all products in this series are 100% production tested at their stated isolation voltage. 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 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. this series has toroidal isolation transformers, 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 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.
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