output 1 -vcc 1/2 +vcc 1/2 output 2 output 3 -vcc 3/4 +vcc 3/4 output 4 n/c pin-out information typical applications 4707 dey road liverpool, n.y. 13088 (315) 701-6751 features: mil-prf-38534 certified 105 iso-9001 certified by dscc m.s.kennedy corp. low cost wide supply voltage range: 5v to 40v high output current: 3a minimum high efficiency: ? vs-2.2v ? at 2.5a internal current limit wide common mode range (includes negative supply voltage) low distortion internal output snubbers for ultra-stable operation high power quad operational amplifier equivalent schematic 1 2 3 4 5 6 7 8 9 -input 1 +input 1 +input 2 -input 2 n/c -input 3 +input 3 +input 4 -input 4 18 17 16 15 14 13 12 11 10 half and full bridge motor drives audio power amplifiers bridge - 60w rms per pair stereo - 30w rms per channel ideal for single supply systems 5v - peripheral 12v - automotive 28v - avionic description: the msk 105 is a high power quad operational amplifier. each amplifier is capable of delivering three amps of current to the load. the msk 105 is an excellent low cost alternative for bridge mode configurations since all amplifiers are packaged together and will track thermally. the wide common mode range includes the negative rail, facilitating single supply applications. it is possible to have a "ground based" input driving a single supply amplifier with ground acting as the second or "bottom" supply of the amplifier. to maintain stability, output snubber networks have been internally connected to each op amp output (see "amplifier stability" in the attached application notes). the output stage is also current limit protected to approximately 3.0 amps. the msk 105 is packaged in a space efficient 18-pin ceramic dip. consult factory for other packaging options if desired. 1 rev. c 8/00
storage temperature lead temperature case operating temperature (MSK105b) (MSK105) thermal resistance (dc) junction to case (per amplifier) input bias current static supply voltage range input offset voltage offset voltage drift power supply rejection common mode rejection total noise output output voltage swing output current current limit power bandwidth crosstalk capacitive load transfer characteristics slew rate open loop voltage gain total supply voltage output current (within s.o.a.) input voltage (differential) input voltage (common mode) junction temperature -65c to +150c 300c -55c to +125c -40c to +85c 4.0c/w 40v 4a v cc +v cc , -v cc -0.5v 150c 1 2 3 4 5 6 absolute maximum ratings t st t ld t c r th v cc i out v ind v in t j unless otherwise noted vcc=15vdc. specification is for each amplifier. devices shall be capable of meeting the parameter, but need not be tested. typical parameters are for reference only. industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise requested. military grade devices ('b' suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroup 5 and 6 testing available upon request. subgroup 1,4 tc=+25c subgroup 2,5 tc=+125c subgroup 3,6 ta=-55c group a subgroup - 1 2 3 1 - - - - - - 4 4 - - - - 4 - typ. 15 60 120 40 0.5 15 35 75 80 85 0.1 14.2 4.0 4.0 13.6 68 0.022 1.5 100 min. 2.5 - - - - - - - 60 60 - 14 3.0 - - 60 - 0.5 80 min. 2.5 - - - - - - - 60 60 - 14 3.0 - - - - 0.5 80 max. 20 150 - - 15 - 1500 - - - 1.0 - - - - - - - - typ. 15 60 - - 2 15 35 75 80 85 0.1 14.2 4.0 4.0 13.6 68 0.022 1.5 100 units v ma ma ma mv v/c na na db db mv v a a khz db f v/s db MSK105b MSK105 2 parameter max. 20 150 210 150 12 - 1000 1000 - - 1.0 - - - - - - - - test conditions electrical specifications 1 2 notes: quiescent current 2 2 2 2 2 2 2 (split supply) total; v in =0v v in =0v v in =0v v cm =0v full temp. d v cc =15v v cm =10vdc r l =500 w a v =1 c l =1500pf (i out =0.5a) v out =max v out =28v pp i out =1a f=1khz a v =+1v/v f=10hz r l =500 w rev. c 8/00 2
application notes safe operating area (soa) amplifier stability since both output transistors in this amplifier are npn, con- sideration must be taken when stabilizing the output. a one ohm resistor, 0.047uf capacitor snubber network has been added internally from the output to -vcc on each amplifier. this configuration minimizes local output stage oscillations. as al- ways, adequate power supply bypassing is a necessity for amplifier stability. a parallel combination of a 4.7uf electro- lytic (for every amp of output current) and a 0.01uf ceramic disc capacitor should be connected as close as possible to the package power supply pins to ground. the r-c snubber net- works shown on the outputs of the amplifiers in the typical circuits are internal and should not be added externally. if the inductive load is driven near steady state conditions al- lowing the output to drop more than 6v below the supply rail while the amplifier is current limiting, the inductor should be capacitively coupled or the supply voltage must be lowered to meet the soa criteria. it is a good practice to also connect reverse biased fast recovery diodes to the output for protection against sustained high energy flyback. bidirectional motor drive parallel connection yields single 6a amplifier vcc 20v 15v 10v 5v inductive load 7.5mh 25mh 35mh 150mh capacitive load 200uf 500uf 5mf 50mf safe operating area curves are a graphical representation of all of the power limiting factors involved in the output stage of an operational amplifier. three major power limiting factors are; output transistor wire bond carrying capability, output tran- sistor junction temperature and secondary breakdown effects. to see if your application is meeting or exceeding the limita- tions of the safe operating area curves, perform the following steps: 1.) find the worst case output power dissipation. for a split supply, purely resistive load application, this occurs when v out =1/2 v cc . 2.) take the values of (v cc -v out ) and the corresponding out- put current and find their intersection on the safe operating area curves. 3.) verify this point is below the safe operating area curves. this is a simple task for purely resistive loads, for reactive loads the following table will save extensive analysis. under tran- sient conditions, capacitive and inductive loads up to the fol- lowing maximum are safe. rev. c 8/00 3
application notes continued t j =p d x (r q jc + r q cs + r q sa ) + t a where t j = junction temperature p d = total power dissipation r q jc = junction to case thermal resistance r q cs = case to heat sink thermal resistance r q sa = heat sink to ambient thermal resistance t c = case temperature t a = ambient temperature t s = sink temperature governing equation: thermal path: heat sinking to determine if a heat sink is necessary for your appli- cation and if so, what type, refer to the thermal model and governing equation below. thermal model: example: 1.) find driver power dissipation p d = [(quiescent current) x (+v cc - (-v cc ))] + [(v cc -v o ) x i out x 2] = (75ma) x (40v) + (10v) x (0.5a) + (10v) x (0.5a) = 3w + 10w = 13w 2.) for conservative design, set t j =+150c. 3.) for this example, worst case t a =+25c 4.) r q jc = 4.0c/w typically 5.) r q cs = 0.15c/w for most thermal greases 6.) rearrange governing equation to solve for r q sa r q sa = ((t j - t a )/p d ) - (r q jc ) - (r q cs ) = ((150c - 25c) / 13w) - (4c/w) - (.15c/w) @ 5.5c/w the heat sink in this example must have a thermal resistance of no more than 5.5c/w to maintain a junc- tion temperature of no more than +150c . inside the msk 105 package are two monolithic dual amplifiers. for this thermal analysis, each die will be considered individually. in our example the amplifier ap- plication requires each output to drive a 10 volt peak sine wave across a 20 ohm load for 0.5 amp of output current. for a worst case analysis we will treat the 0.5 amp peak output current as a d.c. output current. the power supplies are 20vdc. rev. c 8/00 4
typical performance curves rev. c 8/00 5
mechanical specifications esd triangle indicates pin 1. all dimensions are 0.010 inches unless otherwise labeled. 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. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com MSK105 screening level part number MSK105 MSK105b industrial military-mil-prf-38534 ordering information rev. c 8/00 6
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