Details, datasheet, quote on part number: MSK-0021FP
DescriptionHIGH Power Op-amp
CompanyM.S. Kennedy
DatasheetDownload MSK-0021FP datasheet


Features, Applications

Available as SMD #5962-8508701 Output Current - 0.5 Amps Peak Low Power Consumption-Class C Design Programmable Current Limit High Slew Rate Continuous Output Short Circuit Duration Replacement for LH0041 Available in a surface mount package MSK0041FP MSK0041

The MSK 0041 and 0041FP are general purpose Class C power operational amplifiers. These amplifiers offer high output currents, making them 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 two external resistors. These devices are also compensated with a single external capacitor. The MSK 0041 is available in a hermetically sealed 12 pin TO-8 package. The MSK 0041FP is packaged a 12 pin hermetic metal flatpack.

Servo Amplifer Motor Driver Audio Amplifier Programmable Power Supply

MSK0041 1 ISC+ 2 Compensation 3 GND NC 5 -Input 6 +Input 7 Balance 8 Balance 9 ISC10 -VCC 11 Output 12 +VCC (PIN NUMBERS ARE FOR FP 1 GND 2 Balance 3 -Input 4 +Input 5 Balance NC 7 -VCC 8 ISC9 Output 10 ISC+ 11 +VCC 12 Compensation

VCC IOUT VIN RTH Supply Voltage Peak Output Current Differential Input Voltage Common Mode Input Voltage Thermal Resistance-Junction to Case MSK 0041 MSK 0041FP

Storage Temperature Range Lead Temperature Range (10 Seconds) Junction Temperature Case Operating Temperature Range Military Versions (H/B/E) Industrial Versions

STATIC Supply Voltage Range Quiescent Current Power Consumption INPUT Input Offset Voltage Input Bias Current Input Offset Current Input Capacitance Input Resistance

Common Mode Rejection Ratio Power Supply Rejection Ratio Input Noise Voltage OUTPUT Output Voltage Swing

RSC = 3.3 VOUT = MAX Output Short Circuit Current Settling Time 0.1% 2V step TRANSFER CHARACTERISTICS Slew Rate VOUT 100 3 Open Loop Voltage Gain Transition Times Overshoot = 1K

Unless otherwise specified, VCC = 3000pF. 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/H suffix) shall be 100% tested to subgroups 2, 3 and 4. Subgroup = +25C Subgroup = +125C Subgroup = -55C Reference DSCC SMD 5962-8508701 for electrical specifications for devices purchased as such. Subgroup 5 and 6 testing available upon request.

To select the correct heat sink for your application, refer to the thermal model and governing equation below.

The MSK 0041 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. 0.7 ISC

PD x (RJC + RCS + RSA) + TA Where TJ PD RJC RCS RSA 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 See "Application Circuits" in this data sheet for additional information on current limit connections.

In our example the amplifier application requires the output to drive a 10 volt peak sine wave across a 100 ohm load for 0.1 amp of output current. For a worst case analysis we will treat the 0.1 amp peak output current as a D.C. output current. The power supplies are 15 VDC. 1.) Find Power Dissipation PD=[(quiescent current) X (+VCC - (VCC))] + [(VS - VO) X IOUT] =(3.5 mA) =0.6W 2.) For conservative design, set +150C. 3.) For this example, worst case +25C. 4.) RJC 85C/W 5.) Rearrange governing equation to solve for RSA: RSA = (TJ - TA) PD - (RJC) - (RCS) = 123C/W The heat sink in this example must have a thermal resistance of no more than 123C/W to maintain a junction temperature of less than +150C. This calculation assumes a case to sink thermal resistance 0.15C/W. 3

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.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.

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 curves to ensure high M.T.B.F. Rev. - 4/02


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