ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 1 model 1.8v units paramet er output voltage setpoint 1.78 ? 1.82 vdc line/load regulation max 0.1% / 0.2% % vo output total regulation 1.75 ? 1.85 vdc output adjust (note 4) 90 - 110 %vo,nom remote - sense comp. 10% v output ripple & noise (note 2) max 100 mvp - p o utput current 0 - 20 a efficiency (48v, full load, 25c) typ 87% % external capacitance 1,000 - 10,000 m f transient response (typ) (3) d vo 165 mv 25% step, 1a/ m s ts 400 m s over - voltage trip point (latching) 2.1 ? 2.6 v over - current trip point (non - latching) typ 25 a all specifications, waveforms, charts at ta=25c, vin=48v, unless otherwise specified
ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 2 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 prot ection 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(bellcore) calculated at 40c ambient, (bellcore) 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) recognized, 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
ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 3 ehs20-018 efficiency 80 82 84 86 88 90 5 10 15 20 output current (a) q3 21oct03 efficiency (%) 48 v 36 v 75 v ehs20 - 018 enable with pre - bias output voltage @ 0.5 v/div., 2 ms/div. prebias voltage = 1.2 vdc. input voltage 48 v load current = 0, load capacitance = 2,200 uf. ehs20-018 thermal derating airflow from vo(-) to vo(+), tj= 120oc 5 10 15 20 25 20 30 40 50 60 70 80 90 ambient temperature [oc] q3 17oct03 output current [a] 400 lfm 300 lfm 200 lfm 100 lfm ehs20-018 thermal derating airflow from vin to vo, tj = 120oc 5 10 15 20 25 20 30 40 50 60 70 80 90 ambient temperature [oc] q3 17oct03 output current [a] 400 lfm 300 lfm 200 lfm 100 lfm 10 100 1000 0% 2% 4% 6% 8% 10% delta (%) resistance (kohms) rup (1.8 v) rdown ehs20 - 018 trim - up and trim - down resista nce trim up/down formula : 1.8v model rup 5.10 vnom . 100 d % ( ) . 1.225 d % . 510 d % 10.2 k w where d % vout vnom ( ) 100 . vnom and, vout = target output voltage where rdown d % ( ) 510 d % 10.2 k w d % vnom vout ( ) 100 . vnom
ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 4 ehs20 - 018 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 - 018 transient response, 50 - 75% step 1a/ m s d vo = 73.4 mv ehs20 - 018 transient response, 50 - 25% step 1a/ m s d vo = 68.8 mv ehs20 - 018 output ripple voltage, io=20a ehs20 - 018 startup sequence from enable ehs20 - 018 input reflected ripple, io= 20a input current @ 5 ma/div., 20 us/div. (9.4 mapp) input voltage: 48 vdc, load current: 20 a note: see test circuit on following page.
ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 5 notes : 1. input reflected ripple is specified when 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 re sponse is specified with a 470uf tantalum capacitor at the output of the converter 4. trim resistor connection: rtrim - up connected from vo adj to vo(+), rtrim ? down connected from vo adj 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 built into information technology equipment, the installation must comply with the above standard. an externa l 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 ma terials meet ul 94v - 0 flammability ratings. ehs20 - 018 enable pin connection table enable po wer 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 (int ernal pull - up > 50kohms @ 5v) note: power supply has internal pull - up resistor. enable pin is in a valid ?high? state if left open - circuit.
ehs20 ? 1. 8 v model 4118 14 th avenue, unit 4 markham , ontario l3r 0j3 1 - 866 - 740 - 1232 www.cd4power.com ehs20 - 620 0971501 _ c0 3 _ 04jan07 page 6 part number designations c&d technologies, inc. reserve s the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. please check with your supplier or visit our website to ensure that you have the current and complete specification for your product be fore use. ? c&d technologies, inc. 200 7 no part of this publication may be copied, transmitted, or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without pri or written permission from c&d technologies, inc. instructions for use are available from: www.cd4power.com rohs compl ia nt the ehs series of c onverter s is in compliance 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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