rev:20130814a page 1 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary f ea tures wide 4 : 1 input voltage range(9~36v,18~75v) h i gh efficiency up to 90% remote on/off input / output isolation voltage: 1.5k vdc extended operating temperature range: -40c to+85c output short circuit protection: hiccup, continuous & auto recovery over voltage protection: clamp mode shielded metal case with insulated baseplate lead free design, rohs compliant 6 pin dip package with industry-standard footprint standard 2?x1? package customer design available te c hnical specification all specifications are typical at nominal input, full load and 25c unless otherwise stated. output current (ma) input current (ma) model number input voltage range output voltage (v) min. load ( 1) full. load no load full load eff . ( 2 ) (%) capacitive load, max. ( 3 ) (uf) buc20-24s0w 3.3 0 5 5 00 70 9 4 5 84 33000 buc20-24s1w 5.1 0 4 0 00 86 1012 88 18000 buc20-24s2w 12 150 1 6 70 38 1006 87 3300 buc20-24s3w 15 80 1 3 30 49 990 88 2200 BUC20-24D1W 5 0 2 000 91 992 88 8200 buc20-24d2w 12 25 8 35 45 1006 87 1000 buc20-24d3w 9~36v n o minal:24v 15 0 665 95 1002 87 900 buc20-48s0w 3.3 0 5 5 00 25 461 86 33000 buc20-48s1w 5.1 0 4 0 00 38 500 89 18000 buc20-48s2w 12 90 1 6 70 40 491 89 3300 buc20-48s3w 15 55 1 3 30 37 489 89 2200 buc20-48d1w 5 0 2 000 39 484 90 8200 buc20-48d2w 12 10 8 35 42 491 89 1000 buc20-48d3w 18~75v n o minal:48v 15 0 665 43 495 88 900 description the buc20w series are isolated 20w dc/dc converters. designed with highly efficiency, allow the operating temperature range of these units to be -40c to +85c (with derating) in a 6 pin dip package with industry-standard footprint. further features include wide 4 : 1 input voltage range, remote on/off control, trimmable output, short-circuit protection, over voltage protection and over temperature protection. applications these converters are well suitable for battery operated equipment, measurement equipment, telecom, wireless network, industry control system, everywhere where isolated, tightly regulated voltages and compact size are required. bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 2 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary input specifications input voltage 2 4 v nominal input 9-36v 4 8 v nominal input 18-75v input filter p i type input surge voltage 2 4 v nominal input 50v (100ms max.) 4 8 v nominal input 100v input reflected ripple current n o minal vin and full load 100map-p typ. start up time n o minal vin and constant resistive load 80ms typ. converter: on o p en or 3.5v vr 12v remote on/off c o nverter: off short (4) or 0v vr 0.7v sourcing current of remote control pin nominal vin 0.2 ma idle input current (at remote off state) nominal vin 1 5 ma environmental specifications operating ambient temperature - 4 0c to +85c (with derating) maximum case temperature + 1 00c storage temperature range - 5 5c to +105c relative humidity 9 5 % r h max. temperature coefficient 0 .02% / c max. output specifications output power 2 0 .4 watts max. voltage accuracy full load and nominal vin 1% minimum load s e e table line regulation l l to hl at full load 0.5% 25% load to full load single 0 .5% balanced load dual 0 .5% load regulation unbalanced load 25% to 100% full load 3% 20mhz bandwidth ripple and noise ( m easured with a 2.2uf/50v mlcc) 85mvp-p max. 3.3vout models 3.9v over voltage protection 5 . 1vout models 6.2v (zener diode clamp) 1 2 vout models 15v 1 5 vout models 18v capacitive load s e e table over load protection % of full load at nominal input 110% min. short circuit protection h i ccup, continuous (auto recovery) transient response settling time 50% load step change 3 0 0 s typ. ( 1 .8ms for 3.3vout ) transient response over shoot d i /dt=0.8a/ s 5% of vo ( 8% for 3.3vout) bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 3 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary general specifications efficiency n o minal input see table isolation voltage i n put to output 1500v dc isolation resistance 5 0 0vdc 10 9 ohms min. isolation capacitance 1 2 00pf typ. switching frequency 3 0 0khz typ. reliability, calculated mtbf 1 . 06 10 6 hrs physical specifications case material n i ckel-coated copper base material n o n-conductive black plastic potting material s i licon rubber (ul94v-0) 2 . 0 1.0 0.4 inch dimensions ( 5 0.8 25.4 10.2 mm) weight 32.0g (1.13oz) typ. buc20w series power derating curve(5) am b ient temp.ta ( ) buc20-48s1w buc20-48s1w input voltage vs. efficiency output current vs. efficiency input voltage (v) output current (a) output power (%) efficiency (%) efficiency (%) -40 -20 0 2 0 80 40 60 70 105 120 0 2 0 40 60 70 80 120 100 bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 4 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary b u c20-48s1w buc20- 48s1w t r ansient response at 50%~100% max load loop gain & phase at vi=48v,full loa note 1. io below this value will not damage these converters, however, they may not meet all listed specifications. 2. typical value, tested at nominal input and full load. 3. for each output. 4. short to -vin (pin 2). 5. based on buc20-48s1w. mechanical dimensions sp e cifications subject to change without noticed. pin assignment pin single dual 1 +vin +vin 2 -vin -vin 3 r e mote on/off 4 +vout +vout 5 -vout common 6 trim -vout unit: mm [inch] t o lerance: 0.5[0.02] bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 5 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary test configurations a l l specifications are typical at nominal input, full load and 25c unless otherwise stated. dc power supply: it offers a wide voltage and current range precisely. current meter (a): accuracy 200a ~ 200ma 4 ranges+ (0.2% rdg + 2 digits) 2 0 00ma ~ 20a 2 ranges+ (0.3% rdg + 2 digits). v o ltage meter (v): accuracy + (0.03% rdg + 4 digits). l o ad: at full load. wires: the resistance of the wires must be small. 1. input voltage range: n arrow input voltage range 10 % wide input voltage range (2:1 and 4:1) ex: narrow input voltage range 10% 5v nominal input 4.5~5.5v 12v nominal input 10.8~13.2v 24v nominal input 21.6~26.4v wide input voltage range 2:1 5v nominal input 4.5~9v 12v nominal input 9~18v 24v nominal input 18~36v 48v nominal input 36~75v wide input voltage range 4:1 (w) 24v nominal input 9~36v 48v nominal input 18~75v 2. input power : pin = vin x iin vin inp ut voltage iin input current 3. output power : pout = vout x iout vout out put voltage iout output current 4. efficiency : pout: output power pi n : input power 5. voltage accuracy : v o ut output voltage vo ut(nominal) nominal output voltage dc power supply a v load dc/dc converter v a dc power supply a v load dc/dc converter v a v out-vout(nominal) vout x 1 00% efficiency = x100% pout p i n bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 6 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary noise ripple ripple & no ise 6 . line regulation : (1) wide input voltage range and regulated output vol tage series. (2) narrow input voltage range 1 0 % and unregulated output voltage series. ? vout = vout(+10%)-vout(-10%) x100% v o ut vout(+10%) output voltage at vin = 1.1xvin(nominal)&full load vout(-10%) output voltage at vin = 0.9xvin(nominal)&full load vout output voltage at vin = vin(nominal)&full load ? vin = vin(+10%)-vin(-10%) x100% v i n(nominal) vin(+10%) input voltage = 1.1xvin(nominal) vin(-10%) input voltage = 0.9xvin(nominal) vin(nominal) nominal input voltage 7. load regulation : v out(fl)-vout(nl) x100% v o ut(fl) vout(fl): output voltage at full load vout(nl): output voltage at 25% full load or 10% full load 8. ripple and noise : a s shown below. the bandwidth is 0-20mhz. v out(ll)-vout(hl) vout(ll) l l : low line input voltage hl: high line input voltage x100% v out v in line regulation = bothhand usa sales@bothhandusa.com www.bothhandusa.com
rev:20130814a page 7 of 7 isolated dc - dc converters buc20w series -- 20 watt preliminary o u tput ripple&noise measurement test circuit: as shown below. co: usually 0.47uf. 9. temperature derating curve : t he dc-dc converter will operate over a wider temperat ure range if less power is drawn from the output and the device is already running. the temperature derating curve shows the operating power-temperature range. as shown below. ambient temp.ta ( ) 1 0. switching frequency : t he nominal operating frequency of the dc-dc converter s. 11. i nput to output isolation : t he dielectric breakdown strength test between input a nd output circuits. this is the isolation voltage the device is capable of withstanding for a specified time, usually 1 second or 1 minute. load dc/dc converter oscilloscope copper strip copper strip co load dc/dc converter oscilloscope copper strip copper strip load dc/dc converter oscilloscope copper strip copper strip co output power (%) -40 -20 0 2 0 80 40 60 70 105 120 0 2 0 40 60 70 80 12 0 100 bothhand usa sales@bothhandusa.com www.bothhandusa.com
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