models vdc o utput single 3.3 5 12 15 dual 5 12 15 description the smflhp series? 28 volt dc/dc converters are rated up to 100 watts output power over a ?55 to +125c temperature range with a 28 vdc nominal input. on dual output models, up to 70% of the rated output power can be drawn from either the positive or negative outputs. current sharing allows the units to be paralleled for total power of up to 270 watts. the welded, hermetically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 67 watts per cubic inch. s creening smflhp converters offer screening options to space prototype (o), class h, or class k. available radiation hardness (rha) levels are o or r. see ?qa screening: class h and k, qml? for more infor- mation. d esign f eatures the smflhp series converters are switching regulators that use a quasi-square wave, single ended forward converter design with a constant switching frequency of 600 khz. isolation between input and output circuits is provided with a trans- former in the forward path and wide bandwidth magnetic coupling in the feedback control loop. the smflhp series uses a unique dual loop feedback technique that controls output current with an inner feedback loop and output voltage with a cascaded voltage mode feedback loop. the additional secondary current mode feedback loop improves transient response in a manner similar to primary current mode control and allows for ease of paralleling. tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. the output voltage on single smflhp models can be easily trimmed by adding an external resistor. (see figure 1 for voltage changes with different resistor values.) i nhibit the smflhp series converters have two ttl compatible inhibit terminals (inh1 and inh2) that can be used to disable power conversion, resulting in a very low quiescent input current. an open collector ttl compatible low (<0.8 volts) is required between inh1 (pin 4) and input common (pin 2) to inhibit the converter. an open collector ttl compatible low (<0.5 volts) is required between inh2 (pin 12) and output common (pin 8) to inhibit the converter. the application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. c urrent s haring and p arallel o peration multiple smflhp converters may be used in parallel to drive a common load (see figure 2). in this mode of operation the load current is shared by two or three smflhp converters. in current sharing mode, one smflhp converter is designated as a master. the slave pin (pin 11) of the master is left unconnected and the mstr/inh2 pin (pin 12) of the master is connected to the slave pin (pin 11) of the slave units. the units designated as slaves have the mstr/inh2 pin (pin 12) connected to the sns rtn pin (pin 9). figure 2 shows the typical setup for two or three units in parallel. note that synchronizing the units together (though shown in the figure) is not required for current sharing operation. a second slave unit may be placed in parallel with a master and slave; this requires the tri pin (pin 3) of the master unit to be connected to the sns rtn pin (pin 9). when paralleled, 90% of the total combined power ratings of the smflhp converters are available at the load. overload and short circuit performance are not adversely affected during parallel operation. dc/dc c onverters 28 v olt i nput smflhp series 100 watt f eatures fully qualified to class h or k ?5 to +125? operation 19 to 40 vdc input ? fully isolated ? magnetic feedback ? fixed frequency, 600 khz typical ? topology ? single ended forward ? inhibit function ? input and output ? sync function ? output trim on single output models ? indefinite short circuit protection ? remote sense on single output models ? up to 87% efficiency ? parallelable up to 270 watts size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) see cases ?u maximum dimensions? and ?u? for dimensions. weight: 86 grams maximum screening: space prototype, class h, or class k radiation hardness levels o or r see ?qa screening: class h and k, qml? for more information. available configurations: oo, ho, hr, kr interpoint, a crane co. company po box 97005 ? redmond wa 98073-9705 425-895-4053 ? electronics@craneae.com www.craneae.com/power contact information
typical characteristics sync in and inhibit (inh1, inh2) recommended operating conditions absolute maximum ratings input voltage ? 0 to 40 vdc power dissipation (pd) ? 20 watts output power ? 80 to 100 watts depending on model lead soldering temperature (10 sec per lead) ? 300c storage temperature range (case) ? ?65c to +150c smflhp series 100 watt dc/dc c onverters output voltage temperature coefficient ? 100 ppm/c typical input to output capacitance ? 150 pf typical isolation ? 100 megohm minimum at 500 v audio rejection ? 50 db typical conversion frequency ? free run mode 600 khz typical 550 khz min, 650 khz. max ? external sync range 525 to 675 khz inhibit pin voltage (unit enabled) ? inh1 = 9 to12 v, inh2 = 6 to 9 v input voltage range ? 19 to 40 vdc continuous ? 50 v for 50 msec transient case operating temperature (tc) ? ?55 to +125c full power ? ?55 to +135c absolute derating output power/current ? linearly from 100% at 125c to 0% at 135c electrical characteristics: ?5? to +125? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. sync in (525 to 675 khz) ? duty cycle 40% min, 60% max ? logic low 0.8 v max ? logic high 4.5 v min ? referenced to input common ? if not used, connect to input common sync out - referenced to input common inhibit (inh1, inh2) ttl open collector ? logic low (output disabled) current ?10 to ?5 ma inh1 referenced to input common logic low 0.8 v max inh2 referenced to output common logic low 0.5 v max ? logic high (output enabled) open collector notes 1. unit will shut down above approximately 45v but will be undamaged and will restart when voltage drops into normal range. 2. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 3. transition time > 10 s. single output models smflhp283r3s smflhp2805s smflhp2812s smflhp2815s parameter condition min typ max min typ max min typ max min typ max units output voltage 25c 3.26 3.3 3.34 4.95 5.00 5.05 11.88 12.00 12.12 14.8515.00 15.15 vdc output current v in = 19 to 40 vdc 0 ? 18 0 ? 16 0 ? 7.5 0 ? 6.67 a output power v in = 19 to 40 vdc 0 ? 60 0 ? 80 0 ? 90 0 ? 100 w output ripple tc = 25c ? 10 45 ? 15 50 ? 30 85 ? 30 95 voltage 10 k - 2 mhz tc = ?55c to +125c ? 20 80 ? 30 90 ? 45 150 ? 45 175 mv p-p line regulation v in = 19 to 40 vdc ? 0 50 ? 0 50 ? 0 50 ? 0 50 mv load regulation no load to full ? 0 20 ? 0 20 ? 0 20 ? 0 20 mv input voltage continuous 19 28 40 19 28 40 19 28 40 19 28 40 vdc no load to full transient 1 50 ms ? ? 50 ? ? 50 ? ? 50 ? ? 50 v input current no load ? 70 120 ? 70 120 ? 50 80 ? 50 80 ma full load ? 2.9 3.1 ? 3.6 3.73 ? 3.8 3.95 ? 4.2 4.40 a inhibited - inh1 ? 9 15 ? 9 15 ? 9 15 ? 9 15 ma inhibited - inh2 ? 35 80 ? 35 80 ? 35 80 ? 35 80 input ripple current 10 khz - 10 mhz ? 30 80 ? 30 80 ? 30 80 ? 30 80 ma pp efficiency tc = 25c 70 72 ? 77 80 ? 81 86 ? 82 87 ? % load fault power dissipation tc = 25c short circuit ? 15 20 ? 15 20 ? 15 20 ? 15 20 w recovery ? 1.5 4 ? 1.5 4 ? 1.5 4 ? 1.5 4 ms step load resp. 50% ? 100% ? 50% transient ? 350 450 ? 350 450 ? 450 700 ? 450 700 mv pk recovery 2 ? 1.5 3.0 ? 1.5 3.0 ? 1.5 3.0 ? 1.5 3.0 ms step line resp. 19 ? 40 ? 19 vdc transient 3 ? 250 400 ? 250 400 ? 250 400 ? 250 400 mv pk recovery 2 ? 200 600 ? 200 600 ? 200 600 ? 200 600 s start-up delay ? 3.5 10 ? 3.5 10 ? 3.5 10 ? 3.5 10 ms overshoot ? 0 25 ? 0 25 ? 0 50 ? 0 50 mv pk pins not in use tr1 inhibit (inh1) sync out sync in sense lines slave mstr (inh 2) no connection no connection no connection connect to output common must be connected to appropriate outputs no connection no connection
smflhp series 100 watt dc/dc c onverters electrical characteristics: ?5? to +125? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. dual output models smflhp2805d smflhp2812d smflhp2815d parameter conditions min typ max min typ max min typ max units output voltage +v out 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc tc = 25c ?v out 4.92 5.00 5.08 11.82 12.00 12.18 14.77 15.00 15.23 output current 1 each output 0 ? 11.2 0 ? 5.3 0 ? 4.67 a v in = 19 to 40 vdc total 0 ? 16.0 0 ? 7.5 0 ? 6.67 output power 1 each output 0 ? 56 0 ? 63 0 ? 70 w v in = 19 to 40 vdc total 0 ? 80 0 ? 90 0 ? 100 output ripple 10 khz - 2 mhz voltage +v out ? 25 150 ? 50 175 ? 50 225 mv p-p ?v out ? 25 150 ? 50 175 ? 50 225 line regulation +v out ? 0 50 ? 0 50 ? 0 50 mv v in = 19 to 40 vdc ?v out ? 25 100 ? 25 100 ? 25 100 load regulation +v out ? 0 50 ? 10 100 ? 10 100 mv no load to full ?v out ? 25 100 ? 50 200 ? 50 200 input voltage continuous 19 28 40 19 28 40 19 28 40 vdc no load to full transient 2 50 ms 0 ? 50 0 ? 50 0 ? 50 v input current no load ? 50 120 ? 50 120 ? 550 120 ma tc = 25c full load ? 3.6 ? 3.8 ? 4.2 a inhibited - inh1 ? 9 14 ? 9 14 ? 9 14 ma inhibited - inh2 ? 35 80 ? 35 80 ? 35 80 input ripple current 10 khz - 10 mhz ? 30 80 ? 30 80 ? 30 80 ma p-p efficiency 25c tc balanced load 75 80 ? 81 86 ? 82 87 ? % load fault power dissipation tc = 25c short circuit ? 15 20 ? 15 20 ? 15 20 w recovery ? 1.5 4.0 ? 1.5 4.0 ? 1.5 4.0 ms step load 50 %?100%? 50% load response v out transient ? 350 450 ? 450 700 ? 450 700 mv pk recovery 3 ? 1.5 3.0 ? 1.5 3.0 ? 1.5 3.0 ms step line 19 ? 40 ? 16 v in response v out transient 4 ? 250 600 ? 250 600 ? 250 600 mv pk recovery 3 ? 200 300 ? 200 300 ? 200 300 s start?up delay ? 3.5 20 ? 3.5 20 ? 3.5 20 ms overshoot ? 0 25 ? 0 50 ? 0 50 mv p notes 1. up to 70% of the total output power (current) is available from either output provided the opposite output is carrying 30% of the power (current) in use. 2. unit will shut down above approximately 45v but will be undamaged and will restart when voltage drops into normal range. 3. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 4. transition time > 10 s.
smflhp series 100 watt dc/dc c onverters single output models connection diagrams - sense and parallel r l 1 2 3 4 5 6 remote sense connection 12 11 10 9 8 7 ? + 28v ? + inhibit sync in r l 1 2 3 4 5 6 output voltage adjust connection 12 11 10 9 8 7 ? + 28v ? + inhibit sync in 0.1 0.2 0.3 0.4 0.5 70 140 210 280 350 25 50 75 100 125 20 40 60 80 100 ra (ohms) 5?v 12?v 15?v vout increase (volt) ra positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output r l 1 positive input input common tr1 inh1 sync out sync in 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 connect only when 2 slaves are used 12 11 10 9 8 7 12 11 10 9 8 7 12 11 10 9 8 7 + mstr/inh2 slave pos. sense sense return output common positive output master slave 1 slave 2 28v + inhibit sync in positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output f igure 1: s ense c onnections and t rim t able f igure 2: p arallel c onnections
pin out angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 top view smflhp (pin side, marked side) see cases ?u maximum dimensions? and ?u? for dimensions. f igure 3: p in o ut smflhp series 100 watt dc/dc c onverters model numbering key smflhp 28 05 s / k r base model input voltage output voltage screening number of outputs (s = single, d = dual) radiation level typical performance curves: 25? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. output (watts) smflhp2805s & smflhp2805d efficiency efficiency ( %) 60 90 85 80 75 70 10 30 50 70 90 28v 40v 65 19v f igure 4 output power (watts) smflhp2812s & smflhp2812d efficiency efficiency ( %) 60 90 85 80 75 70 10 30 50 70 90 65 19v 28v 40v f igure 5 f igure 6 60 90 85 80 75 70 10 30 50 70 90 65 output power (watts) smflhp2815s & smflhp2815d efficiency efficiency ( %) 19v 40v 28v 100 pin single output dual output 1 positive input positive input 2 input common input common 3 triple (tri) triple (tri) 4 inhibit 1 (inh1) inhibit 1 (inh1) 5 sync out sync out 6 sync in sync in 7 positive output positive output 8 output common output common 9 sense return negative output 10 positive sense no connection 11 slave slave 12 master / inhibit 2 master / inhibit 2 (mstr/inh2) (mstr/inh2)
smflhp series 100 watt dc/dc c onverters typical performance curves: 25? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. f igure 7 f igure 9 0.1 0. 20. 40. 60. 80. 100. attenuation (db) frequency (khz) smflhp series audio rejection 1 10 100 100mv/div. 100% to 50% 50% to 100% 1ms/div smflhp2805s step load response 50 s/div 19 to 40 v smflhp2805s step line response 100mv/div . 20v/div . vout vin f igure 8 f igure 13 f igure 15 5v/div. 20v/div. v in ?vout +vout 1ms/div no load smflhp2815d turn on response 30 40 50 60 70 80 16 18 17 90 19 output power (watts) low line dropout input voltage (volts) 100 smflhp2805s & 5d smflhp2815s & 15d smflhp2812s & 12d 1ms/div no load smflhp2805s turn on response 1v/div. 20v/div. vin vout f igure 10 50 s/div 19 to 40 v smflhp2815d step line response 100mv/div . +vout ?vout vin 20v/div . f igure 11 0 30 40 50 60 ? 8 ? 6 ? 4 ? 2 2 4 6 8 smflhp2812d smflhp2805d 70 smflhp2815d output load (%) +pout 70 to 30 %, ?pout 30 to 70% cross regulation ?vout voltage change (%) f igure 14 f igure 12 1ms/div smflhp2815d step load response 200mv/div. 100% to 50% 50% to 100% smflhp rev g (input ripple - error) october 6, 2005. this revision supercedes all previous releases. all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. smflhp series is a trademark of interpoint. copyright ? 1999-2005 interpoint. all rights reserved.
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