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| ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. POWER OPERATIONAL AMPLIFIER 115 (315) 701-6751 4707 Dey Road Liverpool, N.Y. 13088 MIL-PRF-38534 QUALIFIED FEATURES: High Output Current - 15A peak Ultra Low Thermal Resistance - 0.43C/W Excellent Linearity - Class A/B Output Wide Supply Range - 10V to 50V High Power Dissipation - 175W at TC=125C Output Short Circuit Protected User Programmable Current Limit Isolated Case Allows Direct Heat Sinking Low Quiescent Current -22mA. Typ The MSK 115 is a High Power Operational Amplifier. Due to the extremely low thermal resistance from the transistor junctions to the case, the MSK 115 can dissipate extreme amounts of power at a case temperature of 125C. The amplifier is packaged in a hermetic plug in power package with bolt down tabs. DESCRIPTION: MSK 115 EQUIVALENT SCHEMATIC EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS TYPICAL APPLICATIONS Magnetic Deflection Circuit Driver Programmable Power Supplies Motor, Valve and Actuator Control Audio Amplifier 1 2 3 4 5 6 1 PIN-OUT INFORMATION +VCC Balance Inverting Input Non-Inverting Input Balance -VCC 12 11 10 9 8 7 +VC +Current Limit Output Output -Current Limit -VC Rev. A 6/02 ABSOLUTE MAXIMUM RATINGS See S0A Curve 175C ELECTRICAL SPECIFICATIONS Parameter STATIC Supply Voltage Range Quiescent Current Thermal Resistance INPUT Input Offset Voltage Input Offset Adjust Input Bias Current Input Offset Current Input Impedance VIN=0V AV=10V/V 1 2,3 1 2,3 VCM=0V Either Input VCM=0V F=DC 2 2 2 Vcc=40VDC Unless Otherwise Specified Group A MSK 115B/E Typ. 22 28 0.43 2 3 Max. 50 35 45 0.55 6 12 Min. 10 35 74 33 33 10 1 85 MSK 115 Typ. 22 0.43 2 10 5 250 35 100 37 37 5 2.5 105 3 Max. 50 40 0.6 10 50 50 Subgroup Min. 10 Units Test Conditions VIN=0V AV=-10V/V Junction to Case 1 2,3 - Bal.Pins=NC RPOT=10K To -VCC AV=-10V/V Adjust to zero Adjust to zero 50 80 35 35 15 2.5 95 10 15 5 10 250 35 100 37 37 2 5 105 4 30 60 30 50 - Adjust to zero 1 2,3 1 2,3 4 4 4 4 4 - 2 Common Mode Range OUTPUT Output Voltage Swing Output Current, Peak Settling Time 1 2 Common Mode Rejection Ratio 2 F=100Hz VCM=5V RL=500 AV=-10V/V RL=10 RSC 0.02 AV=-10V/V TJ<175C 0.1% 10V step VOUT=10V RL=500 AV=-10V/V 2 2 TRANSFER CHARACTERISTICS Slew Rate Open Loop Voltage Gain Gain Bandwidth Product V/S dB MHz RL=500 F=10Hz RL=10 F=1 MHz NOTES: 1 2 3 4 5 6 AV= -1, measured in false summing junction circuit. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. 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. TA=TC=+25C Subgroup 1,4 TA=TC=+125C Subgroup 2,5 TA=TC=-55C Subgroup 3,6 2 Rev. A 6/02 VCC IOUT VIN TC Supply Voltage 50V Output Current 15A Differential Input Voltage 37V Case Operating Temperature Range (MSK 115B/E) -55C to+125C (MSK 115) -40C to +85C TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) PD Power Dissipation TJ Junction Temperature -65C to +150C 300C V mA mA C/W mV mV mV mV nA nA nA nA M V dB V V A S APPLICATION NOTES HEAT SINKING To determine if a heat sink is necessary for your application and if so, what type, refer to the thermal model and governing equation below. CURRENT LIMIT Thermal Model: The MSK 115 has an on-board current limit scheme designed to shut off the output drivers anytime output current exceeds a predetermined limit. The following formula may be used to determine the value of current limit resistance necessary to establish the desired current limit. RCL=(OHMs)=(0.65 volts/current limit in amps) - 0.01OHM The 0.01 ohm term takes into account any wire bond and lead resistance. Since the 0.65 volt term is obtained from the base emitter voltage drop of a bipolar transistor: the equation only holds true for operation at +25C case temperature. The curve below illustrates the effect of case temperature on current limit. Governing Equation: TJ=PD x (RJC + RCS + RSA) + TA Where TJ=Junction Temperature PD=Total Power Dissipation RJC=Junction to Case Thermal Resistance RCS=Case to Heat Sink Thermal Resistance RSA=Heat Sink to Ambient Thermal Resistance TC=Case Temperature TA=Ambient Temperature TS=Sink Temperature Example: In our example the amplifier application requires the output to drive a 20 volt peak sine wave across a 20 ohm load for 1 amp of output current. For a worst case analysis we will treat the 1 amp peak output current as a D.C. output current. The power supplies are 40 VDC. 1.) Find Power Dissipation PD =[(quiescent current) x (VS-(VS))]+[(+VS-VO) x IOUT] =(25mA) x (80V)+(20V) x (1A) =2W+20W =22W 2.) For conservative design, set TJ=+125C 3.) For this example, worst case TA=+50C 4.) RJC=0.55C/W from MSK 115B Data Sheet 5.) RCS=0.15C/W for most thermal greases 6.) Rearrange governing equation to solve for RSA RSA=((TJ-TA)/PD) - (RJC) - (RCS) =((125C -50C)/22W) - (0.55C/W) - (0.15C/W) =2.71C/W The heat sink in this example must have a thermal resistance of no more than 2.71C/W to maintain a junction temperature of no more than +125C. POWER SUPPLY BYPASSING Both the negative and the positive power supplies must be effectively decoupled with a high and low frequency bypass circuit to avoid power supply induced oscillation. An effective decoupling scheme consists of a 0.1 microfarad ceramic capacitor in parallel with a 4.7 microfarad tantalum capacitor from each power supply pin to ground. It is also a good practice with very high power op-amps, such as the MSK 115, to place a 30-50 microfarad non-electrolytic capacitor with a low effective series resistance in parallel with the other two power supply decoupling capacitors. This capacitor will eliminate any peak output voltage clipping which may occur due to poor power supply load regulation. All power supply decoupling capacitors should be placed as close to the package power supply pins as possible (pins 7 and 12). 3 Rev. A 6/02 TYPICAL PERFORMANCE CURVES 4 Rev. A 6/02 MECHANICAL SPECIFICATIONS MSK 115 ESD TRIANGLE INCICATES PIN 1. NOTE: ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED. Part Number MSK115 MSK 115E MSK115B ORDERING INFORMATION Screening Level Industrial Extended Reliability Mil-PRF-38534 Class H M.S. Kennedy Corp. 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com 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. 5 Rev. A 6/02 |
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