hi-rel design ? wave solderable package ? all ceramic capacitors ? surface mount magnetics features ? replaces apex dhc2812s, dhc2815s ? no derating C55c to +125c ? high isolation 500v ? output voltage adjustment standard ? remote shutdown ? 11 C 50v input @ 5 watts output description the dac2812s and dac2815s dc-dc converters are higher output voltage companion devices to msk's dhc types. the dac's provide the ruggedness, reliability and features required to meet the advanced design challenges of today's hi-rel market. this has been accomplished while retaining a power density of 15 w/in 3 and 375 mw/gram of power/package performance. the use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective and completely solderable package. the dac2800s hybrid converter series utilizes all ceramic capacitors, surface mount magnetics, and ultrasonically bonded wires to provide reliable operation at all operating tempera- tures while surviving g forces of up to 500 g. the dac2800s series standard features include output fault monitoring and/or turn on voltage point programming via the shutdown pin. all three functions may be implemented simultaneously with a minimum of external components. an output voltage adjustment / load compensation pin which adjusts outputs simultaneously is also standard. fault tolerant design protects these converters from most external circuit faults. the +output and output adjust pins will withstand +25 v while the shutdown pin will withstand +50 v, protecting the converters from a variety of system or board faults; e.g. 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. a transformer isolated flyback converter topology operating at a switching frequency of 400 khz allows operation over a wide input voltage range. internal filtering of outputs eliminates the need for external capacitors in many applications. the 8-pin package is hermetically sealed and isolated from the internal circuits. heat sinking is recommended for full power operation at elevated ambient temperatures. typical application block diagram external connections p w m feed forward controller error amplifier reference and isolation 4 1 2 6 5 7 4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 dac2800s series iso-9001 certified by dscc 6w dc-dc converters rev. a 3/01 1 1 2 3 4 5 +output output common n/c adjust/comp shutdown plus 8 7 6 case -input +input
absolute maximum ratings specifications dac2812s ? dac2815s specifications parameter test conditions 1 min typ max min typ max units steady state characteristics input voltage range C55c ? 125c 11 28 50 11 28 50 vdc output voltage i o = 10% 11.9 12 12.1 14.9 15 15.1 vdc output current C55c 125c v in = 16 ? 40 450 360 madc v in = 11 ? 50 417 333 madc output power C55c 125c v in = 16 ? 40 5.4 5.4 w v in = 11 ? 50 5 5 w efficiency i o = 100% 62 67 63 68 % line regulation v in = 11 ? 50 2 525 525mv load regulation po = 0-5.4w 2 525 525mv operating temperature, case C55 125 C55 125 c temperature coefficient (vout) 0.006 0.006 %/c input ripple current bandwidth = 10khz ? 1mhz 340 400 340 400 marms with 1h series inductance bandwidth = 10khz ? 1mhz 45 55 45 55 marms output ripple voltage bandwidth = 10khz ? 1mhz 15 60 15 60 mvrms load capacitance (output v in = 16 ? 40 200 200 f over C55c 125c) v in = 11 ? 50 100 100 f short circuit dissipation 0.5 0.5 w quiescent input current 50 70 50 70 ma inhibited 0.09 1.25 2.5 0.09 1.25 2.5 ma isolation characteristics (input/output/case) leakage resistance 500 vdc 100 100 m w leakage capacitance 10khz 400 400 500 pf dynamic characteristics line step response, 10s rise v in = 16 ? 40vdc, i o = 100% voltage change 200 200 mv recovery time (99%) 200 200 s with 200 f output capacitors 3 voltage change 100 100 mv recovery time (99%) 400 500 s load step response, 10s rise i o = 50C100C50% voltage change 500 500 mv recovery time (99%) 150 150 s with 200 f output capacitors 3 voltage change 100 100 mv recovery time (99%) 500 600 s start-up overshoot v in = 0 ? 28 vdc 0 0 mv shutdown delay pin 5 = >10 ? <8 vdc 250 500 250 500 s shutdown recovery pin 5 = > 8 ? <10vdc 40 60 40 60 ms dac2812s dac2815s absolute maximum ratings dac2812s dac2815s input voltage range (pin 7 to 6 or 5) 50vdc 50vdc input transient (pin 7 to 6) 80v @ 50ms 80v @ 50ms output current (continuous) 450ma 360ma temperature, storage C65c, 150c C65c, 150c temperature, pin soldering 10s 300c 300c notes: 1. unless otherwise stated t c = 25, v in = 28v, po = 5 watts, 2. regulation measured on output pins 1/16" from case. package & thermal specifications min typ max units weight 14 grams temperature rise, junction to case 17 25 c temperature rise, case to ambient 30 c/w rev. a 3/01 2
typical performance graphs dac2812s 0456 output current, p out (w) 10 12 13 11 14 15 16 low line drop out input voltage, v in (v) 123 10k 90k 60k 20k 30k 40k input voltage, v in (v) line transient response efficiency contours 10 30 50 40 20 output power, p out (w) 5 1234 1.44 .18 .36 .72 1.08 1.8 5 1234 set point resistor, r sp ( w ) time, t (10msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 10k 100k ?0 ?0 response, x (units/div) 12v 0v 28v v out v in temp = 25 c 40% 50% 55% 60% 64% 67% 69% input voltage, v in (v) efficiency contours output current, p out (w) temp = 125 c 40% 50% 56% 61% 64% 66% input voltage, v in (v) efficiency contours 11 50 40 20 30 10 50 40 20 30 output current, i out (a) temp = ?5 c 30% 40% 50% 55% 67% 68% 68% 60% 65% 66% 63% time, t (500 sec/div) time, t (100 sec/div) load transient response 200 f output response, x (units/div) output response, x (units/div) includes 200 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 450ma 450ma load load v out v out v out v in 16v output load = 450ma 225ma 225ma 500mv 100ma 200mv 100ma 200mv 20v 20v 5v no output bus capcitance v in = 28v i out = 450ma output dc power rating includes 200 f on output i out = 450ma 40v includes 4.7 f on output bus rev. a 3/01 3
typical performance graphs dac2815s line transient response 0456 output current, p out (w) 10 12 13 11 14 15 16 low line drop out input voltage, v in (v) 123 10k 90k 60k 20k 30k 40k input voltage, v in (v) efficiency contours 10 30 50 40 20 output current, p out (w) 5 1234 5 1234 5 1234 set point resistor, r sp ( w ) time, t (10msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 10k 100k ?0 ?0 response, x (units/div) 15v 0v 28v v out v in temp = 25 c 40% 50% 56% 60% 64% 68% 70% input voltage, v in (v) efficiency contours output current, p out (w) temp = 125 c 40% 50% 56% 61% 65% 67% 68% input voltage, v in (v) efficiency contours 10 50 40 20 30 10 50 40 20 30 output current, p out (w) temp = ?5 c 40% 50% 58% 69% 72% 62% 66% time, t (500 sec/div) time, t (100 sec/div) load transient response 200 f output response, x (units/div) output response, x (units/div) includes 200 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 360ma 360ma load load v out v out v out v in 16v 40v output load = 360ma 180ma 180ma 500mv 100ma 200mv 100ma 200mv 20v 20v 5v no output bus capcitance v in = 28v i out = 360ma output dc power rating includes 200 f on output v out = 360ma includes 4.7 f on output bus rev. a 3/01 4
output adjust / comp the output voltage of the dac2812s and dac2815s may be adjusted from 90% to 110% of nominal value by the use of a 150k w potentiometer 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 temperature performance will change. characterization by the user is recommended in such applica- tions. adjust/comp (pin 4) may be driven by external circuitry referenced to pin 2 (-output) if desired. grounding pin 4 causes voltage to increase (25% typically) while driving pin 4 above 1.3 v causes output voltage to decrease. pin 4 may be driven negative without damage, however the resultant increase in converter output voltage should be considered. 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 load transient response to be tailored to suit specific application requirements. this feature may be utilized by connecting a 10 or less nf capacitor between pins 4 and 1. note: the dac2812s and dac2815s use pin 4 while the dhc2803s and dhc2805s use pin 3. shutdown plus pin 5 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 5 is necessary for normal operation of the converter. pin 5 is referenced to pin 7 (-input). shutdown may be implemented by simply connecting pin 5 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 5 to 7. 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: r = 210 * 10 3 e to ?9.5 (+/?10% accuracy at 25 o c) set point temperature coefficient is typically + 400ppm/ o c output fault monitoring is accomplished by observing pin 5 4 1 2 150k 10nf with a high impedance monitoring circuit. pin 5 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 5 will return low and the cycle will repeat. a resistor > 400 k w from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. load fault response the msk families of dc-dc converters share load fault philosophies. load fault conditions include short-circuit and severe overload conditions. the dac2800 converter series responds to load faults by turning off all power conversion circuits for 250 ms and then attempting to restart for 10 ms (typical). the net "on" duty factor during a fault is very low resulting in low converter dissipation and immunity from over- heating at 125c. current beyond rated can flow into the load at startup time. this allows the converter to bring up capacitive and other difficult load types more reliably than competing converters. v o normal time normal load fault o i o o typical performance graphs dac2812s ? dac2815s rev. a 3/01 5
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. dac2812s 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 12=12v; 15=15v nominal input voltage general part number rev. a 3/01 6 mechanical specifications
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