|Category||Analog & Mixed-Signal Processing => Amplifiers => Operational Amplifiers|
|Description||Operational Amplifier, High Power Amp W/programmable Current Limit|
|Datasheet||Download MSK161 datasheet
High Output Current Wide Supply Range Low Cost Class "C" Output Stage Wide Common Mode Range Low Quiescent Current Electrically Isolated Case Replaces PA61
The MSK is a high output current operational amplifier designed to drive resistive or reactive loads. The Class "C" output stage is protected by a user programmable current limit scheme. The MSK 161 is designed be a low cost solution for low frequency applications where crossover distortion is not critical. The MSK 161 can supply ±10 amps of output current within its safe operating range and boasts a 16 KHz power bandwidth. A low junction to case thermal resistance of only 1.2°C/W for the output devices keeps junction temperatures low when driving large load currents.EQUIVALENT SCHEMATIC EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS
Programmable Power Supply Valve and Actuator Control Motor/Syncro Driver or DC Power Regulator
Output Positive Current Limit Positive Power Supply Non-Inverting Input Negative Current Limit NC Negative Power Supply Inverting Input
±VCC IOUT VIN TC Supply Voltage ±45V Output Current ±10A Differential Input Voltage ±VCC -3V Case Operating Temperature Range (MSK -55°C to+125°C (MSK to +85°CTST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) TJ Junction Temperature
Parameter STATIC Supply Voltage Range Quiescent Current Thermal Resistance INPUT Input Offset Voltage Input Bias Current Input Offset Current Input Impedance VIN=0V AV=10V/V
Common Mode Range OUTPUT Output Voltage Swing Output Current, Peak Settling Time Slew Rate Open Loop Voltage Gain Bandwidth Product
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=+25°C Subgroup 1,4 TA=TC=+125°C Subgroup 2,5 TA=TC=-55°C Subgroup 3,6
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.
The MSK 161 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 +25°C case temperature. The effect that temperature has on current limit may be seen on the Current Limit vs. Case Temperature Curve in the Typical Performance Curves.
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
In our example the amplifier application requires the output to drive a 20 volt peak sine wave across a 400 load for 50mA of peak output current. For a worst case analysis we will treat the 50mA 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] =20.24W 2.) For conservative design, set TJ=+125°C 3.) For this example, worst case 4.) RJC=1.8°C/W from MSK 161 Data Sheet 5.) RCS=0.15°C/W for most thermal greases 6.) Rearrange governing equation to solve for RSA RSA=((TJ-TA)/PD) - (RJC) - (RCS) (0.15°C/W) =1.76°C/W The heat sink in this example must have a thermal resistance of no more than 1.76°C/W to maintain a junction temperature of no more than +125°C.
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 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 161, 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).
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