technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 1 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters model 1.5v units parameter output voltage setpoint 1.48 ? 1.52 vdc line/load regulation max 0.1% / 0.2% % vo output total regulation 1.45 ? 1.55 vdc output adjust (note 4) 90-110 %vo,nom remote-sense comp. 10% v output ripple & noise (note 2) max 100 mvp-p output current 0-20 a efficiency (48v, full load, 25c) typ 86% % external capacitance 1,000 ? 10,000 f transient response (typ) (note 3) vo 150 mv 25% step, 1a/ s ts 400 s over-voltage trip point (latching) 1.80 ? 2.03 v over-current trip point (non-latching) typ 25 a a ll s p ecifications, waveforms, charts at ta=25c, vin=48v, unless otherwise s p ecified
murata power solutions 2 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters parameter conditions min. typ. max. units input input voltage (vin) 36 48 75 vdc reflected ripple current see note (1) 25 ?ma p-p inrush transient 0.2 a 2 s input voltage transient 100ms 10% duty cycle 100 v undervoltage lockout turn-on 32 35 vdc (non-latching)turn-off 31 34 vdc over-voltage lockout (non-latching)turn-off 77 81 vdc isolation input-output 1500 vdc resistance; input-output 10 mohm temperature operating ambient -40 90 c storage -40 125 c protection over-temperature (non-latching)measured on pcb 125 c physical information dimensions 2.30?l x 0.82? w x 0.36?h (58.4 x 20.8 x 9.3 mm) mtbf calculated at 40c ambient, (bellcor e) 1,000,000 hrs ehs15/20 series demonstrated at 40c ambient with 90% confidence: 2,800,000 hrs safety complies with iec/en/csa/ul 60950, provides basic insulation, input to output. c-ul-us (us and canada) recogni zed, tuv certified (bauart). pin assignments pin # description pin # description pin # description 1 vin (+) 4 vout(-) 7 sense + 2 enable 5 sense - 8 vo (+) 3 vin(-) 6 vo adj
murata power solutions 3 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters ehs20-015 enable with pre-bias output voltage @ 0.5 v/div., 2 ms/div. prebias voltage =0.9 vdc. input voltage 48 v load current = 0, load capacitance = 2,200 uf. ehs20-015 efficiency 65.0 70.0 75.0 80.0 85.0 90.0 4 6 8 101214161820 iout [adc] efficiency [%] 36v 48v 75v ehs20-015 temperature derating airflow from input to output, tj=120c 5 10 15 20 25 20 30 40 50 60 70 80 90 ambient temp (deg c) 14nov03 iout (amps dc) 100 lfm 200 lfm 300 lfm 400 lfm ehs20-015 temperature derating airflow from vin(-) to vin(+), tj=120c 5 10 15 20 25 20 30 40 50 60 70 80 90 ambient temp (deg c) 14nov03 iout (amps dc) 100 lfm 200 lfm 300 lfm 400 lfm 1 10 100 1000 0% 2% 4% 6% 8% 10% delta (%) resistance (kohms) rup (1.5 v) rdown ehs20-015 trim-up and trim-down resistance trim up/down formula : 1.5v model rup 5.10 vnom 100 % () 1.225 % 510 % 10.2 k where % vout vnom ( ) 100 vnom and, vout = target output voltage where rdown % () 510 % 10.2 k % vnom vout ( ) 100 vnom
murata power solutions 4 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters ch1: vout ac coupled ch2 : step up current (2a/div) ch1: vout ac coupled ch2 : step down current (2a/div) ehs20-015 startup sequence from vin top trace: vout @ 0.5 v/div. top trace: vout @ 0.5 v/div. bot. trace: vin @ 20v/div. (48vdc ) bot. trace: venable @ 2 v/div. horiz. @ 50 ms/div. horiz. @ 5 ms/div. vin= 36vdc load: 20 a, turn-on delay: 110ms load: 20 a., 10,000 uf, turn-on delay: 4.8 ms ehs20-015 startup sequence from enable ehs20-015 transient response, 50-75% step, 1a/ s ehs20-015 transient response, 50-25% step, 1a/us ehs20-015 input reflected ripple current, iout = 20 a ehs20-015 output ripple voltage, iout = 20a input current @ 5.0 ma/div., 20 us/div. (14 mapp) input voltage: 48 v, load current: 20a note: refer to test circuit schematic
murata power solutions 5 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters notes : 1. input reflected ripple is specified wh en measured with the filter shown below 2. output ripple and noise is specified when measured with a 10uf tantalum and a 1uf ceramic capacitor at the converter output pins 3. transient response is specified with a 470uf tantalum capacitor at t he output of the converter 4. trim resistor connection: rtrim-up connected fr om vo adj to vo(+), rtrim ?down connected from vo ad j to vo ( - ) . 33uf, esr<0.7 ohms @ 100khz vin l2 12uf dc-dc converter rtn 220uf, esr<0.1 ohms @ 100khz i c i s safety considerations the ehs series of converters are certified to iec/en/csa/ul 60950. if this product is bu ilt into informa tion technology equipment, the installation must co mply with the above standard. an external input fuse (5a to 30a recommended), must be used to meet the above requirements. the output of the converter [vo(+)/vo(-)] is considered to remain within selv limits when the input to the converter meets selv or tnv-2 requirements. the converters and materials meet ul 94v-0 flammability ratings. ehs20-015 enable pin connection table enable power supply disable power supply negative logic version 0v < venable < 0.8v (internal pull-up > 50kohms @ 5v) 2.5v < venable < 15v (external pull-up > 1kohms) positive logic version 2.5v < venable < 15v (external pull-up > 1kohms) 0v < venable < 0.8v (internal pull-up > 50kohms @ 5v) note: power supply has internal pull-up resistor. enable pin is in a valid ?high? state if left open-circuit.
murata power solutions 6 ehs20-6200981505_d01_28/04/08 ehs20 C 1.5v model e class converters part number designations rohs compliant the ehs series of converters is in comp liance with the european union directive 2002/95/ec (rohs) with respect to the following sustances: lead (pb), mercury (hg), cadmium (cd), hexavalent chromium, polybrominated biphenyls (pbb) or polybrominated diphenyl ethers (pbde).
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