4707 dey road liverpool, n.y. 13088 (315) 701-6751 features: space efficient dual power amplifier low cost high voltage operation: 150v low quiescent current: 50ma typ. total high output current: 5a min. per amp no second breakdown high speed: 27v/s typ. monolithic mos technology internal compensation for gains greater than 10 v/v mil-prf-38534 qualified 154 iso-9001 certified by dscc m.s.kennedy corp. high power dual operational amplifier MSK154 pin-out information typical applications pa audio magnetic deflection motor drive noise cancellation high power bridge amplifier -vcc1 output drive 1b output drive 1a +vcc1 current sense 2 inverting input 2 non inverting input 2 1 2 3 4 5 6 7 14 13 12 11 10 9 8 non inverting input 1 inverting input 1 current sense1 +vcc 2 output drive 2a output drive 2b -vcc 2 equivalent schematic the msk 154 is a high power dual 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 available output current per amplifier, the msk 154 is also an excellent low cost choice for motor drive circuits. with both amplifiers in the same package, thermally induced output offset voltages are eliminated. the mosfet output frees the msk 154 from secondary breakdown limitations and power dissipation is kept to a minimum with a total quiescent current rating of only 50ma. the msk 154 is packaged in a hermetically sealed 14 pin power dip with heat sink bolt down tabs. description: rev. b 7/00 1
max. 75 50 45 65 10 50 15 100 50 - - - - - - - - - - - 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 2.0c/w 1 2 3 4 5 6 7 8 absolute maximum ratings t st t ld t c r th v cc i out v ind v in t j unless otherwise noted 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 storage temperature lead temperature case operating temperature (MSK154b) (MSK154) thermal resistance (dc) junction to case v in =0v v in =0v v in =0v v cm =0v (dc) v cm =30vdc 10khz bw r l =10k i out =5a pk v out =80v pp 10v step a v =+10v/v f=15hz group a subgroup - 1 2 3 1 2,3 1 1,3 2 - - - - 4 4 - - - 4 4 typ. 50 25 20 30 5 10 8 20 - 10 5 106 10 47 42 66 2 - 27 106 min. 15 - - - - - - - - - - 90 - 45 40 - - 10 20 94 min. 15 - - - - - - - - - - 90 - 45 40 - - 10 20 94 max. 75 50 - - 15 - 15 100 - - - - - - - - - - - - typ. 50 25 - - 5 10 8 20 - 10 5 106 10 47 42 66 2 - 27 106 units v ma ma ma mv v/c v/v pa na w pf db v rms v v khz s nf v/s db MSK154b MSK154 2 parameter 4 test conditions electrical specifications 4 4 1 4 4 notes: 4 2 4 11 11 quiescent current 3 4 4 4 4 4 static supply voltage range input offset voltage offset voltage drift offset voltage vs vcc input bias current input impedance input capacitance common mode rejection noise output output voltage swing output voltage swing power bandwidth settling time to 0.1% capacitive load transfer characteristics slew rate open loop voltage gain rev. b 7/00 2 5 each amp v in =0v
application notes current limit (see typical connection diagram) 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 * * 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. typical connection diagram a 0.1 microfarad ceramic disc and low esr capacitor with a value of 10 microfarads per amp of output current should be placed in parallel from each power supply pin to ground. these capacitors must be rated for the full power supply voltage. since the msk 154 is commonly used in circuits where the loop gain is greater than 10 v/v, high frequency noise that enters the op-amp through the power supply lines will be am- plified and could cause the amplifier to break into oscillation. in addition, without supply bypassing, the inductance of the power supply lines interacts with capacitive loads to form an oscillatory lc tank circuit. the power supply decoupling ca- pacitors will minimize this effect and keep the circuit stable. power supply decoupling input protection circuitry within the msk 154 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. input protection it is recommended that the parallel sum of the input and feed- back resistor be 1000 ohms or less to minimize phase shift caused by the r-c network formed by the input resistor, feed- back resistor and input capacitance. an effective method of checking amplifier stability is to apply the worst case capaci- tive load to the output of the amplifier and drive a small signal square wave across it. if overshoot is less than 25%, the system will typically be stable. stability rev. b 7/00 3
typical performance curves rev. b 7/00 4
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 MSK154 rev. b 7/00 screening level part number MSK154 MSK154b industrial military-mil-prf-38534 ordering information 5
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