DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 7
Technical content
M.S.KENNEDY CORP. FEATURES: 115 HIGH POWER High Output Current - 15A peak Ultra Low Thermal Resistance - 0.5°C/W Typ. Excellent Linearity - Class A/B Output Wide Supply Range - ±10V to ±50V High Output Power Dissipation Capability Output Short Circuit Protected User Programmable Current Limit Isolated Case Allows Direct Heat Sinking Low Quiescent Current -±22mA. Typ. Contact MSK for MIL-PRF-38534 Qualification Status MIL-PRF-38534 AND 38535 CERTIFIED FACILITY DESCRIPTION: The MSK115 is a High Power Operational Amplifier. Due to the extremely low thermal resistance from the transistor junctions to the case, the MSK115 can dissipate extreme amounts of power at a case temperature of 125°C. The amplifier is packaged in a hermetic plug in power package with isolated, bolt down tabs. EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS TYPICAL APPLICATIONS PIN-OUT INFORMATION Magnetic Deflection Circuit Driver Programmable Power Supplies Motor, Valve and Actuator Control Audio Amplifier CC Balance Inverting Input Non-Inverting Input Balance CC C +Current Limit Output Output -Current Limit C EQUIVALENT SCHEMATIC OPERATIONAL AMPLIFIER 8548-119 Rev. E 4/14
Common Mode Rejection Ratio OUTPUT Output Voltage Swing Output Current, Peak Settling Time TRANSFER CHARACTERISTICS Slew Rate Open Loop Voltage Gain Gain Bandwidth Product Supply Voltage Output Current Differential Input Voltage Case Operating Temperature Range (MSK115B) -55°C to+125°C (MSK115) -40°C to +85°C Storage Temperature Range -65°C to +150°C Lead Temperature Range (10 Seconds) 300°C Power Dissipation See S0A Curve Junction Temperature 175°C Group A Subgroup 2,3 2,3 8A,8B 2,3 2,3 V mA mA °C/W mV mV mV mV nA nA nA nA MΩ V dB V V A μS V/μS dB MHz V IN=0V AV=-10V/V Junction to Case @ 25°C VIN=0V A V=10V/V Bal.Pins=NC RPOT=10KΩ Wiper to -V CC AV=-10V/V VCM=0V Either Input VCM=0V F=DC F=100Hz V CM=±5V RL=500Ω A V=-10V/V RL=10Ω RSC = 0Ω AV=-10V/V V OUT=MAX 0.1% 10V step VOUT=±10V R L=500Ω AV=-10V/V RL=500Ω F=10Hz RL=10Ω F=1 MHz ±50V 15A ±37V ±VCC IOUT VIN TC Parameter TST TLD PD TJ ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Test Conditions NOTES: Unless otherwise specified, ±VCC=±40VDC 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 devices shall be tested to subgroups 1,4 and 7 unless otherwise specified. Military grade devices ("B" suffix) shall be 100% tested to subgroups 1,2,3,4,7,8A and 8B. Subgroups 5 and 6 testing available upon request. Subgroup 1,4,7 T A=TC=+25°C Subgroup 2,5,8A TA=TC=+125°C Subgroup 3,6,8B TA=TC=-55°C Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. Internal solder reflow temperature is 180°C, do not exceed. MSK115B Min. ±10 ±35 ±35 2.5 Typ. ±22 ±28 0.5 ±10 ±15 ±10 250 ±35 100 ±37 ±36 105 Max. ±50 ±35 ±45 0.6 ±12 ±30 ±250 ±30 ±100 Typ. ±22 0.5 ±10 250 ±35 100 ±37 ±36 2.5 105 MSK115 Min. ±10 ±33 ±33 Max. ±45 ±40 0.7 ±10 ±50 ±50 Units ○○○ Adjust to zero Adjust to zero Adjust to zero 8548-119 Rev. E 4/14
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. Governing Equation: 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 (V S-(VS))]+[(+VS-VO) x I OUT] =(25mA) x (80V)+(20V) x (1A) =2W+20W =22W 2.) For conservative design, set T J=+125°C 3.) For this example, worst case T A=+50°C 4.) RθJC=0.55°C/W from MSK 115B Data Sheet 5.) R θCS=0.15°C/W for most thermal greases 6.) Rearrange governing equation to solve for R θSA RθSA=((TJ-TA)/PD) - (RθJC) - (RθCS) =2.71°C/W The heat sink in this example must have a thermal resistance of no more than 2.71°C/W to maintain a junction temperature of no more than +125°C. TJ=PD x (RθJC + RθCS + RθSA) + TA Where TJ=Junction Temperature PD=Total Power Dissipation RθJC=Junction to Case Thermal Resistance RθCS=Case to Heat Sink Thermal Resistance RθSA=Heat Sink to Ambient Thermal Resistance TC=Case Temperature TA=Ambient Temperature TS=Sink Temperature Thermal Model: CURRENT LIMIT The MSK115 has an on-board current limit scheme designed to shut off the output drivers anytime output current exceeds a prede- termined limit. The following formula may be used to determine the value of current limit resistance necessary to establish the desired current limit. R CL=(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 emit- ter voltage drop of a bipolar transistor: the equation only holds true for operation at +25°C case temperature. The curve below illus- trates the effect of case temperature on current limit. 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 MSK115, to place a 30-50 microfarad non- electrolytic capacitor with a low effective series resistance in par- allel 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 output stage power supply pins as possible (pins 7 and 12). BALANCE PINS Pins 2 & 5 of the MSK115 are used to null unwanted input offset voltage. Connect as shown in the typical connection schematic. If the balance pins are not used, they should be left open/not con- nected. 8548-119 Rev. E 4/14
APPLICATION NOTES CONT'D 4 8548-119 Rev. E 4/14
TYPICAL PERFORMANCE CURVES 5 8548-119 Rev. E 4/14
ORDERING INFORMATION
ESD TRIANGLE INCICATES PIN 1 WEIGHT=31 GRAMS TYPICAL 8548-119 Rev. E 4/14 ALL DIMENSIONS ARE SPECIFIED IN INCHES
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. Contact MSK for MIL-PRF-38534 qualification status. M.S. Kennedy Corp. Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com 7 8548-119 Rev. E 4/14