hi-rel design ? replaces apex db2800s series ? surface mount magnetics ? welded hermetic package ? low internal temperature gradients ? all ceramic capacitors ? withstands 5000g other features?single output ? no derating ? ?55c to +125c ? output voltage adjustment standard ? remote shutdown description the bbf2800s series of dc-dc converters provides the ruggedness, reliability and features required to meet the advanced design challenges of todays hi-rel market. this has been accomplished using a package having very low thermal gradients, excellent hermeticity and high voltage isolation. the use of advanced substrate and reflow soldering tech- niques during construction results in a rugged, cost-effective pin solderable package. the bbf2800s hybrid converter series utilizes all ceramic capacitors and surface mount magnetics to provide reliable operation at all operating temperatures while surviving very high g forces. bbf2800s series standard features include kelvin sense, indefinite short circuit protection, remote shutdown, output fault monitoring, turn on voltage point adjustment, switching frequency synchronization of up to 3 units using no external components and pi-network input filtering. an output voltage adjustment/load compensation pin is also standard. fault tolerant design protects these converters from most external circuit faults. the output and output adjust pins will withstand +35v while the shutdown and all synchronization pins will withstand +50v protecting the converters from a variety of system or board faults, i.e. solder bridges, etc. unique load fault protection circuitry allows this converter to pull up loads having difficult static load line characteristics and allows short term load excursions significantly beyond ratings in most applications. the bbf2800 series is a current mode push-pull topology converter which operates at a switching frequency of 500khz. internal filtering of both input and output eliminates the need for external capacitors in many applications. the 12-pin power dip package allows connection to a heatsink and is hermetically sealed and isolated from the internal circuits. p w m current mode controller error amplifier reference and isolation 8 7 5 6 1 2 3 10 11 12 4 block diagram 4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 bbf2800s series iso-9001 certified by dscc 20w dc-dc converters rev. - 3/01 1 external connections 1 2 3 4 5 6 +input shutdown plus clock adjust/comp -output +output 12 11 10 9 8 7 -input timing 2 timing 1 case -sense +sense
bbf2803s absolute maximum ratings specifications absolute maximum ratings input voltage range (pin 12 to 1, 2, 3, 10 or 11) 0 - 50 vdc input transient (pin 12 to 1) 80 v @ 50 ms output withstand (pin 5 and 8 to 7, 6 or 4) 35 vdc output current (continuous) 5.5 adc bbf2803s 4.0 adc bbf2805s 1.9 adc bbf2812s 1.5 adc bbf2815s temperature, storage C65 o c, 150 o c temperature, pin soldering 10s 300 o c notes: 1. unless otherwise stated: t c = 25, v in = 28v, i out = i max amps 2. derate power linearly to zero from 125c to 135c. 3. regulation measured between pin 8 and pin 7. 4. recovery spec assumes that converter has been off for at least 500ms. caution: the internal substrate contains beryllia (beo). do not break the seal. if accidentally broken, do not crush, machine, o r subject to temperatures in excess of 850c to avoid generating toxic fumes. caution specifications bbf2803s parameter test conditions 1 min typ max units steady state characteristics input voltage range 16 28 40 vdc output voltage v in ; min to max vdc @ i min 3.2 3.3 3.4 vdc output current v in ; min to max vdc 500 5500 madc efficiency 66 % output ripple voltage bandwidth 10 khz to 1mhz 20 50 mvrms input ripple current bandwidth 10 khz to 1mhz 20 50 marms output power 2 1.6 18.0 w line regulation 3 v in ; min to max 3 2 20 mvdc load regulation 3 i out ; min to max 3 1 15 mvdc temperature coefficient .01 %/c temperature range, case 2 C55 125 c quiescent current i out = 0 a 35 40 madc inhibited v pin5 ; < 8 vdc .09 1.25 2.5 madc isolation characteristics (input/output/case) leakage resistance (v test = 500vdc) 100 m w leakage capacitance (f = 10khz) 50 pf dynamic characteristics line step response v in; t r , t f = 10s voltage change v in ; 16 to 40 vdc 300 mv recovery time (95%) 30 s with 100f output cap voltage change v in ; 16 to 40 vdc 100 mv recovery time (95%) 100 s load step response i out; t r , t f = 10s voltage change i out ; 50% to max adc 1400 mv recovery time (95%) 40 s with 100f output cap voltage change i out ; 50% to max adc 300 mv recovery time (95%) 60 s start-up overshoot v in ; 0 to 40 vdc 0 mv shutdown delay v pin5 ; > 10 vdc to < 8 vdc 220 500 s shutdown recovery 4 v pin5 ; < 8 vdc to > 10 vdc 30 60 ms rev. - 3/01 2
specifications bbf2805s ? bbf2812s ? bbf2815s bbf2805s bbf2812s bbf2815s min typ max min typ max min typ max units 16 28 40 16 28 40 16 28 40 vdc 5.00 5.05 5.1 12.00 12.05 12.1 15.0 15.1 15.2 vdc 400 4000 190 1900 150 1500 madc 70 72 73 % 20 50 25 50 25 50 mvrms 20 30 20 30 20 30 marms 2 20 2.3 23 2.2 22 w 5 50 5 50 10 50 mvdc 2 25 5 50 20 50 mvdc .01 .01 .01 %/c C55 125 C55 125 C55 125 c 35 40 35 40 35 40 madc .09 1.25 2.5 .09 1.25 2.5 .9 1.25 2.5 madc 100 100 100 m w 50 80 85 pf 400 300 300 mv 30 40 40 s 200 150 150 mv 250 250 250 s 1400 800 800 mv 40 60 60 s 500 280 280 mv 150 400 400 s 000mv 220 500 220 500 220 500 s 30 60 30 60 30 60 ms package thermal specifications min typ max units resistance, case to air 12 c/w temperature rise, junction to case 10 15 c rev. - 3/01 3
bbf2803s typical performance graphs 0.0 6.0 output current, i out (a) 10 12 14 16 18 20 low line drop out input voltage, v in (v) 2.0 4.0 10k 90k 60k 20k 30k 40k input voltage, v in (v) time, t (500 sec/div) load transient response 1000 f line transient response efficiency contours 16 30 40 35 20 25 output response, x (units/div) output current, i out (a) 4.4 .55 1.1 2.2 3.3 5.5 set point resistor, r sp ( w ) time, t (5msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response 100 200 400 frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 2k 10k 20k 100k ?0 ?0 response, x (units/div) 3.3v 0v 0v 28v v out v in temp = 25 c 40% 50% 56% 60% 64% 66% 67% 68% 69% 66% 70% input voltage, v in (v) efficiency contours 16 30 40 35 20 25 output current, i out (a) temp = 125 c 40% 50% 60% 64% 66% 67% 68% 69% 70% 64% input voltage, v in (v) efficiency contours 16 30 40 35 20 25 output current, i out (a) 4.4 1.1 .55 2.2 3.3 5.5 4.4 1.1 .55 2.2 3.3 5.5 temp = ?5 c 30% 40% 50% 54% 58% 60% 62% 64% 65% 66% 67% includes 1000 f on output bus time, t (200 sec/div) time, t (200 sec/div) load transient response 100 f output response, x (units/div) output response, x (units/div) load = 5.5a load = 5.5a includes 100 f on output bus includes 100 f on output bus includes 100 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 5.5a 5.5a 5.5a 2.75a 2.75a 2.75a v out v out v out v in 16v 40v v out i out i out i out 1 v 2 a 1 v 2 a 100mv 10v 1 v 10 v 2 v 2 a no output bus capcitance v in = 28vdc i out = 5.5 amps output dc current rating temp = 25 c rev. - 3/01 4
bbf2805s typical performance graphs 0.0 5.0 output current, i out (a) 10 12 14 16 18 20 low line drop out input voltage, v in (v) 1.0 2.0 3.0 4.0 10k 90k 70k 20k 30k 40k50k input voltage, v in (v) time, t (500 sec/div) load transient response 1000 f line transient response efficiency contours 16 30 40 35 20 25 output response, x (units/div) output current, i out (a) 3.2 .4 .8 1.6 2.4 4 set point resistor, r sp ( w ) time, t (5msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response 100 200 400 frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 2k 10k 20k 100k ?0 ?0 response, x (units/div) 5.1v 0v 0v 28v v out v in temp = 25 c 30% 40% 50% 60% 68% 70% 63% 66% 71% 72% 73% input voltage, v in (v) efficiency contours 16 30 40 35 20 25 output current, i out (a) 3.2 .4 .8 1.6 2.4 4 temp = 125 c 30% 50% 60% 64% 67% 67% 69% 70% 71% 72% 73% input voltage, v in (v) efficiency contours 15 30 40 35 20 25 output current, i out (a) 3.2 .8 1.6 2.4 4 temp = ?5 c 40% 50% 55% 60% 64% 71% 66% 68% 70% 69% includes 1000 f on output bus time, t (200 sec/div) time, t (200 sec/div) load transient response 100 f output response, x (units/div) output response, x (units/div) includes 100 f on output bus includes 100 f on output bus includes 100 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 4a 4a 4a 2a 2a 2a v out v out v out v in 16v 40v load 4a load 4a v out i out i out i out 1 v 1 a 1 v 1 a 100mv 10v 1 v 10 v 2 v 1 a no output bus capcitance v in = 28vdc i out = 4 amps output dc current rating temp = 25 c rev. - 3/01 5
bbf2800s series application information output adjust / comp the output voltage of the bbf2800s may be adjusted from 90% to 110% of nominal value by the use of a 50k w potenti- ometer as shown. adjustment beyond this range is possible however certain characteristics of the converter such as but not limited to input voltage range, efficiency, ripple and tem- perature performance will change. characterization by the user is recommended in such applications. adjust/comp (pin 4) may be driven by external circuitry referenced to pin 8 (-output sense) if desired. grounding pin 4 causes output voltage to increase (25% typically) while driving pin 4 above 1.3 v causes output voltage to decrease. pin 4 may be driven through 10k w or more if connection of the comp function is also required. the comp function of pin 4 allows transient response and phase margin to be tailored to suit a specific application. this feature may be utilized by connecting a small (1-500 nf) capacitor between pins 4 and 6 or 7. this is generally recom- mended when very large low esr load capacitances are used. shutdown plus pin 2 is used for remote shutdown, output fault detection, and/or setting the input voltage point at which the converter will turn on as shown in the typical application diagram. no connection to pin 2 is necessary for normal operation of the converter. pin 2 is referenced to pin 12 (-input). shutdown may be implemented by simply connecting pin 2 to an open collector logic output or switch rated at 2.5 ma, 25 vdc or higher. input voltage turn on point is programmed with a single resistor from pin 2 to 12. an input turn on/off hysteresis (typically 3.5% of vin) will be observed. this should be considered when making or verifying set point adjustment. the value of the setpoint resistor may be determined by the following: 210 ? 10 3 r = (10% accuracy at 25c) e to C 9.5 set point temperature coefficient is typically +400ppm/c. output fault monitoring is accomplished by observing pin 2 with a high impedance monitoring circuit. pin 2 voltage drops from over 10 v to below 1 v when a load fault causes the converters fault protection circuitry to activate. it will remain low for at least 100 ms and return high. if the load fault is still present pin 2 will return low and the cycle will repeat. if there is no input setpoint programming resistor already in place a resistor > 400 k w from pin 2 to 12 will provide pin 2 pull down. multiple converter synchronization synchronized operation of up to three bbf2800s series converters may be accomplished without external compo- nents. one unit selected to be the master is connected normally with pin 10 grounded. the clock output pin 3 will provide the sync signal for up to two slave units. the slave units have pin 10 not connected and receive the clock signal into pin 11. the clock signal lines may be shielded to prevent radiation. a separate 50 ohm coax to each slave unit is recommended in order to preserve signal integrity. shield ends should be connected to pin 12 of the nearest converter. bbf2800s converters may also be synchronized to an external 500 khz (+/- 5%) frequency source driving pin 11 of the converters. pin 10 is not connected. the converters synchronize to the positive edge of the frequency source allowing a variety of wave forms (pulse, square, spike) to be used. pin 11 is internally capacitively coupled allowing unipo- lar or bipolar frequency sources to be used. the source should have a waveform rise time of 20 ns or less and be capable of driving at least 4 volts peak into each 50 ohm pin 11 input (50 volts peak max). an externally synchronized unit may be used to synchronize other (slave) units. the slave units may be used in turn to synchronize other slave units from their pin 3 outputs. each generation of slave units has a delay (100-200ns typical) from the unit that it is synchronizing to. 4 7 8 50k w typical application the above diagram shows the remote sense feature which reduces vo errors due to the resistance of the conductors feeding the load. this diagram also shows the connections for non-synchronized operation (timing 1 and 2) as well as output voltage trim, remote shutdown, fault monitoring, and input voltage turn on point adjustment. rev. - 3/01 6
the information contained herein is believed to be accurate at the time of printing. msk reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. please visit our website for the most recent revision of this datasheet. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com note: all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. bbf2812s the above example is an industrial grade 12v single output converter ordering information screening blank= industrial; e= extended reliability; h= class h; k= class k single output output voltage 03=3.3v; 05=5v; 12=12v; 15=15v nominal input voltage general part number rev. - 3/01 7 mechanical specifications
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