| 제목 | Apex Microtechnology "Analog Tech Talk" eNEWSLETTER - October 2015 | ||||
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| 작성자 | 관리자 | 작성일 | 2015-10-22 | ||
| 첨부파일 | -- | ||||
| Don't Blow It! Power Dissipation... Lessons Learned Q? If the output of a high voltage power amplifier gets clamped to one of the supply rails and the circuit shuts down -- is the power amplifier blown? A! Because of the power levels involved, any circuit that utilizes a power amplifier must be designed with great caution to avoid destroying the device. Perhaps the greatest challenge is power dissipation. Power amplifiers face a dual challenge in this regard -- first, these devices draw quiescent current as soon as they power up. And then because these amplifiers can work with such high supply voltages, the amount of power generated inside the package translates to substantial power dissipation requirements. Often times a heatsink is required, even when the device is tested when unloaded. Learn More : https://www.apexanalog.com/resources/appnotes/an22u.pdf The Story Continues... More About Thermal Management The importance of a good thermal design is more critical than ever when working with high power op amps. Reliability is a direct function of internal component temperatures and dissipated power. As case temperatures rise above 25°C, the amplifier is subject to derating factors that not only reduce the allowable power level, but voltage and current offsets drift, current limits change, and sometimes even dynamic performance is affected. Good thermal management starts with considering actual dissipation vs allowable dissipation. When the proper techniques are applied, it is possible to remove the necessary heat from the amplifier junction, thereby maintaining lower operating temperatures and higher reliability. Learn More : https://www.apexanalog.com/resources/appnotes/an11u.pdf |
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