AN06 Applying The Super Power PA03
■The super power PA03 is the result of a design effort to substantially increase output power without sacrificing the high performance engineers are accustomed to when using small signal op amps. Thus, this new building block can perform accurate and complex tasks previously reserved to modular and rack mount devices.
■The major applications for the PA03 will be in single ended circuits where up to 1,000W must be delivered to the load or in bridge motor servo systems delivering up to 2,000W peak. Linear motion control, magnetic deflection, programmable power supplies, and power transducer drives are typical of these applications. High power sonar, such as phased array, is another key application made possible by the accurate phase response and linearity of the class A/B output stage. Robot, motion control, and other high current applications which were previously impossible to implement with IC Power Op Amps because of power limits, are now possible using the PA03 as a building block.
■The most powerful TO-3 hybrid IC's currently available can dissipate up to 125W and drive loads up to 250W (Apex Microtechnology PA12), while available monolithic IC's handle less. Where peak power requirements for dynamic motor control exceed 250W, three approaches were commonly used to increase power output: (1) parallel or bridge operation of two or more power op amps; (2) external booster transistors; (3) modular or rack mount power op amps.
■While these options extend power capabilities, they can have major drawbacks in increased cost, excessive weight and reduced reliability. Furthermore, the large size can be a cumbersome design burden. System designers need a small, reliable power op amp capable of producing up to 1,000W while maintaining top notch performance. The PA03 meets this challenge!
■Using the super power PA03 offers many advantages. With an internal power dissipation of up to 500W, the PA03’s ratings top the previously most powerful op amp (Apex Microtechnology PA12) by a factor of four, and one PA03 is more cost effective and far more reliable than four less powerful op amps. Its thermal tracking of internal bias components makes the PA03 much safer to use under abnormal conditions than several units in parallel. Moreover, internal protection circuits insure that almost any power level not violating the 2.400W, 1 ms Safe Operating Area (SOA) is safe.The amplifier will shut down upon overload, avoiding self-destruction. Internal current limiting resistors eliminate bulky, expensive milliohm external resistors which are normally required for power op amps. The common collector complementary output stage allows the output to swing within 4V of the supply rail at 12A and within 6V at 30A and has full shut-down control. This gives the designer a tool to protect sensitive loads or to minimize power consumption under battery operation. By operating in class A/B, it exhibits low crossover distortion, a feature hard to implement without the inherent thermal tracking of single package construction.
■An external balance control option allows the already low offset voltage to be zeroed. The PA03’s high overall accuracy makes it suitable for interfacing directly to photo-diodes; to build long time period integrators; or to design 12 bit and better resolution programmable power supplies.
■The super power PA03 is a hybrid IC housed in the innovative Power-Dip dual in-line package. It has .060 pins on .200 centers to accommodate higher currents and allows layout on the standard 0.100 grid. The Power-Dip copper header of the PA03 provides 8.5 times the thermal conductivity, and three times the area of the conventional steel TO-3 package.
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Application note & Design Guide |
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Please see the document for details |
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TO-3 |
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English Chinese Chinese and English Japanese |
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2012/10/23 |
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REVD |
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AN06U;AN06 |
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431 KB |
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