ro associates, inc. sunnyvale, ca 408 744-1450 fax:408 744-1521 email:sales@roassoc.com ? 12v, 20a dc-dc bus converter model: qvb48-12-20 advance data sheet ? input: 42 ? 53vdc ? output: 12vdc @ 20a features ? 20a output current ? standard quarter brick package ? ultra-high efficiency: 96% ? extended thermal performance ? no heat sink required ? fully protected against: input under-voltage input over-voltage output over-voltage output over-load output short circuit over temperature ? recovers automatically from all protection modes ? constant frequency ? remote logic on/off control ? 2000v input-to-output isolation ? meets basic insulation requirements of en60950/ ul1950 efficiency efficiency (%) 80 82 84 86 88 90 92 94 96 98 100 0 2 4 6 8 10 12 14 16 18 20 (48vin) load current (amps) see last page for available options description the quattroverter qvb48-12-20 is a high efficiency dc-dc converter designed to provide an isolated 12v rail from a 48v line. synchronous rectification, proprietary magnetic geometries and advanced thermal management techniques are used to produce a 12v, 20a output with an ultra high conversion efficiency of 96%. the minimal power loss and packaging make reliable operation possible without the use of a heat sink. operating essentially as a dc transformer with vout = ? vin, the quattroverter qvb is the ideal choice for converting 48v to an intermediate 12v bus for use with multiple, low cost, point of load converters. an evaluation board is available
quattroverter ? dc-dc bus converter model: qvb48-12-20 ro associates, inc. sunnyvale, ca 408 744-1450 fax:408 744-1521 email:sales@roassoc.com absolute maximum ratings parameter min max units conditions continuous input voltage (+in to ?in) -0.3 60 vdc transient input voltage (+in to ?in) -0.3 80 vdc up to 100ms on/off voltage (on/off to ?in) -0.3 40 vdc storage temperature -40 +125 c operating temperature -40 +85 c ambient soldering temperature (wave solder) +260 c < 5 sec. specifications input parameters min typ max units conditions input voltage 42 48 53 vdc startup voltage 42 vdc shut down voltage 39 vdc maximum input current 5.3 a v in = 42v output parameters min typ max units conditions voltage set point 12.0 vdc 48v in , half load load regulation 5 % 0 a to full load line regulation 20 % over v in range voltage drift w/temperature 2 % -40 to +100 c ripple 120 mv p-p 5hz to 20 mhz, at any v in within range, c ext = 10f tantalum + 1f ceramic rated current 0 20 a current limit inception 120 % f.l. v out = 95% v out nominal short circuit current 170 % f.l. v out = 250mv transient response peak deviation settling time 250 100 mv sec load change from 50% to 75% full load slew rate = 0.1a/sec v out within 1% v out nominal external load capacitance 0 3,000 f efficiency (see curve) 96 % 48v in , 3/4 load isolation parameters min typ max units conditions input/output isolation 2000 vdc input-to-output capacitance tbd pf input-to-output resistance 10 m ohms specifications apply with 48vin, full load, 25c unless indicated otherwise. exceeding absolute maximum ratings may cause permanent damage and may reduce reliability
quattroverter ? dc-dc bus converter model: qvb48-12-20 ro associates, inc. www.roassoc.com 800-443-1450 p.o.box 61419 rev 030804 408 744-1450 sunnyvale, ca 94088 email:sales@roassoc.com fax: 408 744-1521 specifications (continued) mechanical parameters min typ max units conditions weight 35 (1.24) g (oz.) size 2.3 x 1.45 x 0.42 inches feature parameters min typ max units conditions over voltage protection 13.75 v over temperature shut-down (automatic recovery) 120 c pcb temperature turn-on time tbd tbd msec 80% f.l., v out within 1% logic on/off logic low 0.5 v v out = 0 on/off source current 2 ma @v on/off < 0.5v logic high 15 v on/off sink current 50 a @v on/off = 15v logic turn-on time 2 msec 80% f.l., v out settled within 1% part numbering scheme converter family v in (nom) v out (nom) i o (rated) logic options pin options qvb 48 - 12 - 20 - quattroverter series 48v nom. 42v - 53 v 12v output 20a rating blank = 1 = pos. logic (std.) neg. logic blank = 6 = 0.200 pth (std.) 0.145 pth outline drawing 8 = smt = 0.110 pth smt option tolerances unless specified otherwise: x.xx in. 0.02 in. [x.x mm. 0.5 mm.] x.xxx in. 0.010 in. [x.xx mm. 0.25 mm.] * other pin lengths available all dimensions are in 0.200 * [5.080] 0.040 [1.02] ? pin 0.070 [1.778] ? standoff 3 pl. inches [millimeters] 0.300 [7.62] 1.45 [36.8] 0.600 [15.24] 0.430 [10.92] 2.00 [50.8] pins farside on/ off -vin +vin -vout +vout 2.30 [58.4] 0.060 [1.52] ? pin 0.090 [2.286] ? standoff 2 pl. 0.42 [10.9] 0.600 [15.24] available options positive logic ? the on/off pin must be high to enable the module?s output. if it?s left floating, the output is enabled. this is the standard logic configuration. negative logic ? the on/off pin must be low to enable the module?s output. if it?s left floating, the output is disabled. alternate pin lengths ? in addition to the 0.200? standard thru- hole pins, ro offers 0.145?, and 0.110? thru-hole pin lengths. smt mounting ? the module is mounted to the target pcb using a surface-mount interface. contact the factory for further information. (minimum quantities and extended lead-times may apply to orders of non-standard options)
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