4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: 158/159 iso-9001 certified by dscc ultra high voltage monolithic mos technology low cost high voltage operation - 350v low quiescent current - 2ma max. high output current - 60ma min. no secondary breakdown high speed - 40v/s typ. mil-prf-38534 qualified description: the msk 158 is an ultra high voltage monolithic mosfet operational amplifier ideally suited for electrostatic transducer and electrostatic deflection applications. with a total supply voltage rating of 350 volts and 60ma of available output current, the msk 158 is also an excellent low cost choice for high voltage piezo drive circuits. the mosfet output frees the msk 158 from secondary breakdown limitations and power dissipation is kept to a minimum with a quiescent current rating of only 2ma. the msk 158 is packaged in a hermetically sealed 8 pin power dip which has two external compensa- tion pins. for applications requiring heat sinking, the msk 159 is available with bolt down tabs and is otherwise identical to the msk 158 (see mechanical specifications). equivalent schematic typical applications typical applications pin-out information piezo electric positioning electrostatic deflection computer to vacuum tube interface ultra high voltage op-amp applications -vcc comp 1 output drive current sense 1 2 3 4 inverting input non-inverting input comp 2 +vcc 7 8 9 10 rev. c 5/02 1 equivalent schematic operational amplifier MSK158 msk159
static supply voltage range quiescent current input offset voltage offset voltage drift offset voltage vs v cc input bias current input impedance input capacitance common mode rejection noise output output voltage swing output current power bandwidth resistance settling time to 0.1% capacitive load transfer characteristics slew rate open loop voltage gain total supply voltage output current (within s.o.a.) output current peak input voltage (differential) input voltage (common mode) junction temperature storage temperature -65c to +150c lead temperature 300c case operating temperature (msk 158b/e/159b/e) -55c to +125c (MSK158/159) -40c to +85c thermal resistance (dc) junction to case 10c/w group a subgroup - 1 2 3 1 2,3 1 1 2,3 - - - - 4 4 - - - - 4 4 v ma ma ma mv v/c v/v pa na w pf db v rms v ma kh z w s nf v/s db v in =0v v in =0v v in =0v v in =0v v cm =0v (dc) v cm =90vdc 1h z f 10h z i out =40ma peak v out =max c c =10pf v out =280v pp no load, r cl =0 w c c =10pf 10v step a v =+1v/v c c =open f=15h z r l =5k w 350v 60ma 120ma 16v v cc 150c v cc i out i outp v ind v in t j parameter t st t ld t c r th electrical specifications absolute maximum ratings test conditions msk 158b/e/159b/e min. 50 - - - - - - - - - - 84 - 138 60 - - - 10 20 94 typ. 150 1.4 2.0 1.0 15 40 20 5 - 10 5 94 50 141 120 26 150 12 - 40 106 max. 175 2.0 3.0 2.1 30 65 32 50 50 - - - - - - - - - - - - typ. 150 1.4 - - 15 - 20 5 - 10 5 94 50 141 120 26 150 12 - 40 106 msk 158/159 min. 50 - - - - - - - - - - 84 - 138 60 - - - 10 20 94 max. 175 2.0 - - 30 - 32 100 - - - - - - - - - - - - - units rev. c 5/02 2 4 2 4 9 notes: unless otherwise noted c c =18pf, r c =2.2k w , v cc =150vdc. 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. guaranteed by design but not tested. typical parameters are representative of actual device performance but are for reference o nly. industrial grade and "e" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified. military grade devices ("b" suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroups 5 and 6 testing available upon request. subgroup 1,4 subgroup 2,5 subgroup 3,6 electrical specifications are derated for power supply voltages less than 50vdc. t a =t c =+25c t a =t c =+125c t a =t c =-55c 1 5 7 8 9 3 4 2 6 4 4 4 4 4 4 4 4 4 4 3 11 11
application notes current limit current limit resistor value can be calculated as follows: r cl =3/i lim it is recommended that the user set up the value of current limit as close as possible to the maximum expected output current to protect the amplifier. the minimum value of current limit resistance is 33 ohms. the maximum practical value is 500 ohms. current limit will vary with case temperature. refer to the typical perfor- mance graphs as a guide. since load current passes through the current limit resistor, a loss in output voltage swing will occur. the following formula approximates output voltage swing reduction: v r =i o * r cl when the device is in current limit, there will be spurious oscil- lations present on the negative half cycle. the frequency of the oscillation is application dependant and can not be predicted. oscil- lation will cease when the device comes out of current limit. if current limit is not required simply short pin 3 and pin 4. input protection input protection circuitry within the msk 158/159 will clip dif- ferential 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 resis- tors in series with each input. these resistors may become dam- aged 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 recommended. output snubber network a 100 ohm resistor and a 330pf capacitor connected in series from the output of the amplifier to ground is recommended for appli- cations where load capacitance is less than 330pf. for larger val- ues of load capacitance, the output snubber network may be omit- ted. if loop stability becomes a problem due to excessively high load capacitance, a 100 ohm resistor may be added between the output of the amplifier (the junction of r cl and pin 4) and the load. a small tradeoff with bandwidth must be made in this configuration. the graph below illustrates the effect of capacitive load on open loop gain. note that the compensation capacitor must have a voltage rating greater than or equal to the total rail to rail power supply voltage. rev. c 5/02 3 safe operating area (soa) the mosfet output stage of this power operational amplifier 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, ex- ternal fast-recovery reverse biased diodes should be connected from the output to ground. stability the msk 158/159 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 resistor and input capacitance. the user can tailor the performance of the msk 158/ 159 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 demonstrate the effect of various forms of compensation. the compensation capacitor must be rated at 350 volts working voltage if maximum power supply voltages are used. the compensation resistor and capacitor lead lengths must be kept as short as possible to minimize spurious oscillations. a high qual- ity npo capacitor is recommended for the compensation capacitor. external compensation external compensation is only necessary at gains of 30v/v or less. for larger gains, the compensation resistor and capacitor may be omitted. an effective method of checking amplifier stability is to apply the worst case capacitive 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 be stable.
typical performance curves rev. c 5/02 4
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. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com rev. c 5/02 5 MSK158 msk159 esd triangle indicates pin 1. note: all dimensions are 0.010 inches unless otherwise labeled. ordering information screening level part number MSK158 MSK158e MSK158b msk159 msk159e msk159b industrial extended reliability mil-prf-38534 class h industrial extended reliability mil-prf-38534 class h
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