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ISO 9001 CERTIFIED BY DSCC
M.S KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
HIGH POWER HIGH POWER OP-AMP OP-AMP
SERIES
541
(315) 701-6751
MIL-PRF-38534 QUALIFIED
FEATURES:
Available as SMD #5962-8870101 High Output Current - 10 Amps Peak Wide Power Supply Range - 10V to 40V Programmable Current Limit FET Input Isolated Case Replacement for OMA 541SKB - MSK 541 OMA 541SDB - MSK 146 OMA 541SZB - MSK 147
MSK145
MSK146
DESCRIPTION:
MSK147
MSK541
The MSK 541 Series is a high power monolithic amplifier ideally suited for high power amplification and magnetic deflection applications. This amplifier is capable of operation at a supply voltage rating of 80 volts and can deliver guaranteed continuous output currents up to 5A, making the 541 series an excellent low cost choice for motor drive circuits. The amplifier and load can be protected from fault conditions through the use of internal current limit circuitry that can be user programmed with a single external resistor. The MSK 541 is pin compatible with popular op-amps such as the Burr-Brown OPA501, OPA511, OPA512, OPA541 and 3573. The MSK 541 is available in a hermetically sealed 8 pin TO-3 package. Other package styles are also available for a wide range of applications. The MSK 145 is available in a 6 pin SIP Package. The MSK 146 is an 8 pin Power DIP Package and the MSK 147 is available in an 8 pin Power Z-TAB Package for applications requiring bolt down heat sinking.
EQUIVALENT SCHEMATIC
MSK 541 ONLY
TYPICAL APPLICATIONS
Servo Amplifer Motor Driver Audio Amplifier Programmable Power Supply
1 Current Sense 5 Inverting Input 2 No Connection 6 Negative Power Supply 3 Positive Power Supply 7 No Connection 4 Non-Inverting Input 8 Output Drive The above pin out table is for the MSK 541 (TO-3). Refer to the mechanical specifications page for the pin out information of additional package styles.
1 Rev. C 3/01
PIN-OUT INFORMATION
ABSOLUTE MAXIMUM RATINGS

ELECTRICAL SPECIFICATIONS
Parameter
STATIC Supply Voltage Range 2 4 Quiescent Current INPUT Input Offset Voltage Input Offset Voltage Drift Input Bias Current
4
9
Test Conditions
Military Group A Typ. Max. Subgroup Min. 1, 2, 3 1 2, 3 1 2, 3 1 2, 3 4 5, 6 4 5, 6 4 4 4 5, 6 10 95 28 30 5 3.0 45 6 95 85 35 20 0.1 15 4 0.2 2.0 5 1012 113 90 10 29 31 8 2 55 10 100 40 30 1.0 50 50 10 30 20 -
VIN = 0V VIN = 0V VIN = 0V VCM = 0V Either Input VCM=0V
Input Offset Current 4
Input Capacitance Input Impedance F = DC Common Mode Rejection Ratio 4 F = DC VCM = 22V Power Supply Rejection Ratio VCC = 10V to 40V Input Noise Voltage F = 10 Hz to 1 KHz OUTPUT RL = 5.6 F = 10 KHz Output Voltage Swing RL =10 F = 10 KHz RL = 5.6 F =10 KHz Output Current RL = 10 F = 10 KHz Settling Time 3 0.1% 2V step Power Bandwidth 4 RL = 10 VO = 20 VRMS TRANSFER CHARACTERISTICS Slew Rate VOUT = 10V RL = 10 Open Loop Voltage Gain 4 F = 10 HZ RL = 10 K
NOTES:
1 2 3 4 5 6 7 8
9
Unless otherwise specified RCL = 0, VCC = 34 VDC Electrical specifications are derated for power supply voltages other than 34 VDC. AV = -1, 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 specified. 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 TA = TC = +25C Subgroup 2, 5 TA = TC = +125C Subgroup 3, 6 TA = TC = -55C Rereference DSCC SMD 5962-8870101 for electrical specifications for devices purchased as such.
2

1.9 C/W 1.2 C/W 1.2 C/W 1.2 C/W
-55C to +125C -40C to +85C
Min. 10 90 28 5 40 6 90 -
Industrial 5 Typ. Max. 35 20 40 35
1.0 10 15 4 100 0.2 2.0 30 5 1012 113 90 10 29 8 2 50 10 100 -
Rev. C 3/01

VCC IOUT VIN VIN RTH
Supply Voltage Peak Output Current Differential Input Voltage Common Mode Input Voltage Thermal Resistance-Junction to Case MSK 541 MSK 145 MSK 146 MSK 147

40V See S.O.A. VCC VCC
TST TLD PD TJ TC
Storage Temperature Range Lead Temperature Range (10 Seconds) Power Dissipation Junction Temperature Case Operating Temperature Range Military Versions Industrial Versions
-65 to +150C 300 125W 150C
Units V mA mV V/C pA nA pA nA pF W dB dB VRMS V V A A S KHz V/S dB dB
APPLICATION NOTES
HEAT SINKING
To select the correct heat sink for your application, refer to the thermal model and governing equation below.
CURRENT LIMIT
The MSK 541 has an on-board current limit scheme designed to limit the output drivers anytime output current exceeds a predetermined limit. The following formula may be used to determine the value of the current limit resistance necessary to establish the desired current limit. RCL (OHMs) = (0.809 volts / current limit in amps) - 0.057 OHM The 0.057 OHM term takes into account any wire bond and lead resistance. Since the 0.809 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 effect that temperature has on current limit may be seen on the Current Limit vs. Case Temperature Curve in the Typical Performance Curves.
Thermal Model:
Current Limit Connection Governing Equation:
TJ = PD X (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA TC TA TS = = = = = = = = Junction Temperature Total Power Dissipation Junction to Case Thermal Resistance Case to Heat Sink Thermal Resistance Heat Sink to Ambient Thermal Resistance Case Temperature Ambient Temperature Sink Temperature
Example: (TO-3 PACKAGE)
In our example the amplifier application requires the output to drive a 20 volt peak sine wave across a 5 ohm load for 4 amps of output current. For a worst case analysis we will treat the 4 amps peak output current as a D.C. output current. The power supplies are 35 VDC. 1.) Find Power Dissipation PD = [(quiescent current) X (+VCC - (VCC))] + [(VS - VO) X IOUT] = (30 mA) X (70V) + (15V) X (4A) = 2.1W + 60W = 62.1W 2.) For conservative design, set TJ = +150C 3.) For this example, worst case TA = +25C 4.) RJC = 1.2C/W typically for the TO-3 package 5.) RCS = 0.15C/W for most thermal greases 6.) Rearrange governing equation to solve for RSA RSA = (TJ - TA) / PD - (RJC) - (RCS) = (150C - 25C) / 62.1W - (1.2C/W) - (0.15C/W) = 0.66C/W The heat sink in this example must have a thermal resistance of no more than 0.66C/W to maintain a junction temperature of no more than +150C. Since this value of thermal resistance may be difficult to find, other measures may have to be taken to decrease the overall power dissipation. 3
See "Application Circuits" in this data sheet for additional information on current limit connections.
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 541, to place a 30-50 microfarad nonelectrolytic 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 3 and 6 for the MSK 541).
SAFE OPERATING AREA
The safe operating area curve is a graphical representation of the power handling capability of the amplifier under various conditions. The wire bond current carrying capability, transistor junction temperature and secondary breakdown limitations are all incorporated into the safe operating area curves. All applications should be checked against the S.O.A. curves to ensure high M.T.B.F. Rev. C 3/01
APPLICATION CIRCUITS
Clamping Output for EMF-Generating Loads
Isolating Capacitive Loads
Motor Current a Function of VIN Programmable Torque Circuit
Replacing OPA501 with MSK 541
When replacing the OPA501, OPA511, OPA512 or 3573 with the MSK 541, it is not necessary to make any changes in the current limit scheme. Since pin 2 is not connected in the MSK 541, the current limit resistor connected from pin 1 to pin 2 can be left in the circuit or removed.
The linear relationship of torque output to current input of the modern torque motor makes this simple control circuit ideal for many material processing and testing applications. The sense resistor develops a feedback voltage proportional to motor current and the small signal properties of the Power Op Amp insure accuracy. With this closed loop operation, temperature induced impedance variations of the motor winding are automatically compensated.
4
Rev. C 3/01
TYPICAL PERFORMANCE CURVES
5
Rev. C 3/01
MECHANICAL SPECIFICATIONS
MSK145 POWER SIP PACKAGE
ALL DIMENSIONS ARE 0.01 INCHES UNLESS OTHERWISE SPECIFIED
MSK146 POWER DIP PACKAGE MSK147
ESD TRIANGLE INDICATES PIN 1
POWER Z-TAB PACKAGE
6
Rev. C 3/01
MECHANICAL SPECIFICATIONS CONTINUED
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE SPECIFIED
ORDERING INFORMATION
Part Number MSK 541 MSK 541 B 5962-8870101X Screening Level Industrial Military - MIL-PRF-38534 DSCC - SMD
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
7
Rev. C 3/01

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