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ISO 9001 CERTIFIED BY DSCC
M.S. KENNEDY CORP FEATURES:
DUAL HIGH POWER OP-AMP
2541
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088 Available as SMD #5962-9083801 HX High Output Current - 10 Amps Peak Wide Power Supply Range - 10V to 40V On Board Current Limit FET Input Isolated Case Second Source for OMA 2541SKB
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 2541 is a high power dual 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 per amplifier. The MSK 2541 has internal current limit circuitry to protect the amplifier and load from transients. The MSK 2541 is available in a hermetically sealed 8 pin TO3 package that is isolated from internal circuitry. This allows for convenient bolt down heat sinking when necessary.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
Servo Amplifer Motor Driver Audio Amplifier Programmable Power Supply Bridge Amplifier 1 2 3 4
PIN-OUT INFORMATION
Output B Positive Power Supply Non-Inverting Input A Inverting Input A 8 7 6 5 Inverting Input B Non-Inverting Input B Negative Power Supply Output A
1
Rev. B 8/00
ABSOLUTE MAXIMUM RATINGS

ELECTRICAL SPECIFICATIONS
MSK 2541B
Parameter
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 40 0.1 15 4 10 2.0 5 1012 113 90 29 31 8 2 55 10 100 1.4 1.25 0.9 0.8 30 40 60 1.0 30 50 50 30 20 1.9 1.5 1.2 1.0 -
5 Industrial Min. Typ. Max. 10 90 28 5 40 6 90 35 40 40 60
MSK 2541
STATIC Supply Voltage Range 2 4 Total - Both Amplifiers VIN = 0V Quiescent Current INPUT Input Offset Voltage VIN = 0V Input Offset Voltage Drift VIN = 0V VCM = 0V Input Bias Current Either Input Input Bias Current Input Capacitance Input Impedance 4 Common Mode Rejection Ratio 4 Power Supply Rejection Ratio 4 OUTPUT Output Voltage Swing VCM = 0V F = DC F = DC VCM = 22V VCC = 10V to 40V
1.0 10 15 4 100 10 2.0 30 5 1012 113 90 29 8 2 50 10 100 1.4 1.25 0.9 0.8 30 1.9 1.5 1.2 1.0 -
RL = 5.6 F 10 KHz RL = 10 F = 10 KHz RL = 5.6 F 10 KHz Output Current RL = 10 F = 10 KHz Settling Time 3 4 0.1% 2V step Power Bandwidth RL = 10 VO = 20 VRMS TRANSFER CHARACTERISTICS Slew Rate VOUT = 10V RL = 10 Open Loop Voltage Gain F = 10 Hz RL = 10 K
THERMAL RESISTANCE 4 JC (Junction to Case) One Amplifier, DC Output JC One Amplifier, AC Output F > 60 Hz JC Both Amplifiers, DC Output JC Both Amplifiers, AC Output F > 60 Hz JA (Junction to Ambient) No Heat Sink
NOTES:
1 2 3 4 5 6 7 8 Unless otherwise specified: RCL = 0, VCC = 34 VDC, all specs are per amplifier. 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 2 Rev. B 8/00

VCC IOUT VIN VIN TC
Voltage Supply 40V Peak Output Current See S.O.A. Differential Input Voltage VCC Common Mode Input Voltage VCC Case Operating Temperature Range MSK 2541B -55 to +125C MSK 2541 -40 to +85C

TST TLD PD TJ
Storage Temperature Range Lead Temperature Range (10 Seconds) Power Dissipation Junction Temperature
-65 to +150C 300C 125W 150C
Units V mA mV V/C pA nA pA nA pF W dB dB V V A A S KHz V/S dB dB C/W C/W C/W C/W C/W
APPLICATION NOTES
HEAT SINKING
To select the correct heat sink for your application, refer to the thermal model and governing equation below.
POWER SUPPLY CONNECTIONS
The MSK 2541 maximum supply voltage is specified as 40V. However, single sided or unbalanced power supply operation is permissible as long as the total power supply voltage does not exceed 80V. Caution should be exercised when routing high current printed circuit paths. Generally, these paths should not be placed near low level, high impedance input circuitry to avoid oscillations. During prototype evaluation, power supply current limiting is strongly advised to avoid damaging the device. See the application note entitled "Current Limit" for an explanation of the limitations of the MSK 2541 on board current limit.
Thermal Model:
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 2541, 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 3 and 6).
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
CURRENT LIMIT
The internal current limit should not be used as a short circuit protection scheme. When the output is directly shorted to ground, the power supply voltage is applied across the output transistor that is conducting. If the power supplies were set to 40V and the output was shorted to ground, the transistor that is conducting current would see 40V from its emitter to its collector. Referring to the safe operating area curve shows when [VCC-VOUT]=40V, the maximum safe output current (IO) at TC=25C is 1.5A. In this case the amplifier would not be protected by the internal current limit and would probably be damaged. The internal current limit is provided as a protection against unintentional load conditions which may require larger amounts of load current than the amplifier is rated for.
Example:
In our example the amplifier application requires each output to drive a 20 volt peak sine wave across a 10 ohm load for 2 amps of output current. For a worst case analysis we will treat the 2 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))] + [(VCC - VO) X IOUT] = (30 mA) X (70V) + (15V) X (2A)+(15V)x(2A) = 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 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) - (.15C/W) = .66C/W The heat sink in this example must have a thermal resistance of no more than .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. Refer to the "Heat Sinking Options" application note offered by MSK. 3
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.T.F.
Rev. B 8/00
TYPICAL PERFORMANCE CURVES
4
Rev. B 8/00
APPLICATION CIRCUITS
CLAMPING OUTPUT FOR EMF-GENERATING LOADS
ISOLATING CAPACITVE LOADS
PROGRAMMABLE VOLTAGE SOURCE 5
PARALLELED OPERATION, EXTENDED S.O.A. Rev. B 8/00
MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE SPECIFIED.
ORDERING INFORMATION
Part Number MSK2541 MSK2541B 5962-9083801HX Screening Level Industrial Military-MIL-PRF-38534 DSCC - SMD
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.
M.S. Kennedy Corp.
6
Rev. B 8/00

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