PA91 Cirrus Logic Inc, PA91 Datasheet

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... AND FEEDBACK (See text.) * Bypassing required. PA91U www.cirrus.com DESCRIPTION The PA91 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 200mA and pulse currents up to 350mA. The safe oper- ating area (SOA) has no second breakdown limitations and can be observed for all type loads by choosing an appropriate current limiting resistor ...

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... Min Typ Max 0 µV/KHz 200 2000 4 50 500 ±V Ŧ µV RMS 94 111 100 470 60 ±V Ŧ 12 ±V Ŧ 200 240 300 470 Units mV µV/°C µV/V pA pA/V pA Ω MHz KHz ° V/µS pF PA91U ...

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... FREQUENCY F (Hz) OUTPUT VOLTAGE SWING 6 5.5 5 4.5 4 3.5 0 .05 0.1 0.15 0.2 OUTPUT CURRENT, I (A) O HARMONIC DISTORTION 1KΩ 200V PA91 Min Typ Max Units 1 µS 50 ±40 ±150 ±225 2.5 °C/W 4.2 °C/W 30 °C/W -25 +85 °C NORMALIZED QUIES. CURRENT 1.3 1.2 1.1 1.0 ...

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... LOW POWER, PIEZOELECTRIC POSITIONING Piezo positioning may be applied to the focusing of seg- mented mirror systems. The composite mirror may be composed of hundreds of elements, each requiring focus- ing under computer control. In such complex systems the PA91 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the SIP package. GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit ...

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... INPUT PROTECTION Although the PA91 can withstand differential voltages up to ±20V, additional external protection is recom- mended. Low leakage, low capacitance JFETs con- nected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth ...

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... TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners PA91U ...