typical applications 4707 dey road liverpool, n.y. 13088 (315) 701-6751 mil-prf-38534 qualified 101 iso-9001 certified by dscc m.s.kennedy corp. features: pa audio magnetic deflection bridge motor drive noise cancellation high power dual operational amplifier equivalent schematic typical applications description: the msk 101 is a dual high power monolithic mosfet operational amplifier ideally suited for high power amplifi- cation and magnetic deflection applications. with a total supply voltage rating of 150 volts and 5a of output current available from each amplifier, the msk 101 is also an excellent low cost choice for motor drive circuits. the mosfet output frees the msk 101 from secondary breakdown limitations and power dissipation is kept to a minimum with a typical quiescent current rating of only 8.0 ma total in class "c" mode. power saving class "c" mode is enabled by the user externally. the msk 101 is packaged in a hermetically sealed 18 pin ceramic dip which has two external compensation pins for each amplifier. pin-out information current sense 1 amp 1 comp 2 amp 1 comp 1 quiescent current adjust 1 +vcc 1 output drive 2 -vcc 2 non-inverting input 2 inverting input 2 inverting input 1 non-inverting input 1 -vcc 1 output drive 1 +vcc 2 quiescent current adjust 2 amp 2 comp 1 amp 2 comp 2 current sense 2 18 17 16 15 14 13 12 11 10 operates in class ab or class c mode low cost high voltage operation : 150v low quiescent current : 8.0 ma total typ. in class "c" mode high output current : 5a min. per amplifier no second breakdown high speed : 27v/s typ. external compensation for optimum gain-bandwidth 1 2 3 4 5 6 7 8 9 rev. a 7/00 1 MSK101
static supply voltage range quiescent current quiescent current (class 'c') input offset voltage offset voltage drift offset voltage vs vcc input impedance input capacitance common mode rejection noise output output voltage swing output current power bandwidth settling time to 0.1% capacitive load transfer characteristics slew rate open loop voltage gain storage temperature lead temperature case operating temperature (MSK101b) (MSK101) thermal resistance (dc) junction to case absolute maximum ratings 150v 5a 16v vcc 150c 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 5.0c/w 1 2 3 4 5 6 7 8 t st t ld t c r th v cc i out v ind v in t j unless otherwise noted c c =10pf, r c =1.0k w , v cc = 50vdc and specifications apply to each amplifier. derate maximum supply voltage 0.5v/c below t c =+25c. no derating is needed above t c =25c. a v =-10v/v measured in false summing junction circuit. 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 t c =+25c subgroup 2,5 t c =+125c subgroup 3,6 t a =-55c notes: 2 group a subgroup - 1 2 3 1 1 2,3 1 1,3 2 - - - - 4 4 - - - 4 4 vin=0v vin=0v v in =0v v in =0v v in =0v (dc) v cm =30vdc 10khz bw i out =5a peak v out =max v out =80v pp 10v step a v =+1v/v c c =68pf c c =open f=15hz typ. 50 30 20 35 4 5 10 8 20 - 10 5 106 10 42 5.5 66 2 - 27 106 1 test conditions max. 75 50 45 65 6 10 50 15 100 50 - - - - - - - - - - - min. 15 - - - - - - - - - - - 90 - 40 5 - - 10 20 94 min. 15 - - - - - - - - - - 90 - 40 5 - - 10 20 94 max. 75 50 - - 6 15 - 15 100 - - - - - - - - - - - - typ. 50 30 - - 4 5 10 8 20 - 10 5 106 10 42 5.5 66 2 - 27 106 units v ma ma ma ma mv v/c v/v pa na w pf db v rms v a khz s nf v/s db MSK101b MSK101 parameter electrical specifications 4 4 3 4 4 4 4 4 4 4 4 2 11 11 4 input bias current v cm = 0v 2 rev. a 7/00
input protection circuitry within the msk 101 will clip differ- ential input voltages greater than 16 volts. the inputs are also protected against common mode voltages up to the supply rails as well as static discharge. there are 300 ohm current limiting resistors in series with each input. these resistors may be- come damaged in the event the input overload is capable of driving currents above 1ma. if severe overload conditions are expected, external input current limiting resistors are recom- mended. current limit (see typical connection diagram) a value of current limit resistance can be calculated as fol- lows: where: r cl is the current limit resistor value i cl is the current limit 0.05 i cl is the voltage dropped in the current limit path across internal impedances other than the actual current limit resistor 0.83 volts is the voltage drop that must be developed across the current limit connections to activate the current limit circuit the maximum practical value of current limit resistance is 16 ohms. the current limit resistor will decrease available output voltage swing in the following manner: v r is the reduction in output voltage swing due to the current limit resistor. it is recommended the user limit output current to a value as close to the required output current as possible, without clipping output voltage swing. current limit will vary with case temperature. refer to the typical performance curves to predict current limit drift. if current limit is not required replace the resistor with a short. safe operating area (soa) the mosfet output stage of this power operational ampli- fier has two distinct limitations: 1. the current handling capability of the die metallization. 2. the junction temperature of the output mosfet's. note: the output stage is protected against transient flyback. however, for protection against sustained, high energy flyback, external fast-recovery reverse biased diodes should be connected from the output to ground. v r =i o r cl * r cl =(0.83 - (0.05 i cl )) / i cl * * stability the msk 101 has sufficient phase margin when compen- sated for unity gain to be stable with capacitive loads of at least 10nf. however, it is recommended that the parallel sum of the input and feedback resistor be 1000 ohms or less for closed loop gains of ten or less to minimize phase shift caused by the r-c network formed by the input resistor, feedback re- sistor and input capacitance. the user can tailor the perfor- mance of the msk 101 to their application using the external compensation pins. the graphs of small signal gain and phase as well as the graphs of slew rate and power response demon- strate the effect of various forms of compensation. the com- pensation capacitor must be rated at 150 volts working voltage if maximum power supply voltages are used. the compensa- tion resistor and capacitor lead lengths must be kept as short as possible to minimize spurious oscillations. a high quality npo capacitor is recommended for the compensation capaci- tor. an effective method of checking amplifier stability is to apply the worst case capacitive load to the output of the ampli- fier and drive a small signal square wave across it. if overshoot is less than 25%, the system will typically be stable. input protection application notes typical connection diagram class "c" mode the user can enable class "c" mode by simply connecting pin 15 to pin 16 and pin 6 to pin 7. this connection will disable the bias control network in the output stage of each amplifier. quiescent current will drop to 8 ma total typically and a small amount of crossover distortion will appear on the output waveforms. this mode of operation is recommended for switch- ing type applications where distortion is not a critical specifica- tion and quiescent power dissipation must be minimized. dis- connecting the pin 15 to pin 16 and pin 6 to pin 7 shorts will enable the bias control network and the outputs will be biased in class ab mode again. pins 15 and 6 should be left uncon- nected when using class ab mode. (do not ground or pull high). 3 rev. a 7/00
typical performance curves rev. a 7/00 4
mechanical specifications esd triangle indicates pin 1. all dimensions are 0.010 inches unless otherwise labeled. rev. a 7/00 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 MSK101 ordering information screening level part number MSK101 MSK101b industrial military-mil-prf-38534 5
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