PA91 Apex Microtechnology

PA91 RoHS High Voltage Power Operational Amplifiers COMPLIANT FEATURES High Voltage 450V (225V) Low Quiescent Current 10mA High Output Current 200mA Programmable Current Limit High Slew Rate 300V/s APPLICATIONS Piezoelectric Positioning High Voltage Instrumentation Electrostatic Transducers Programmable Power Supplies up to 440V 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 load types by choosing an appropriate current limiting resistor. The MOSFET output stage is biased AB for linear operation. External compensation provides flexibility in choosing bandwidth and slew rate for the application. Apex Microtech- nologys Power SIP uses a minimum of board space allowing for high density circuit boards. The 12-pin Power SIP is electrically isolated. Figure 1: Equivalent Schematic 12 11 +V S R1 R2 C1 R3 Q3 Q1 Q2 R4 Q4 Q6 5 I CL CC2 9 4 Q5 Q8 CC1 R7 10 Q14A Q14B Q11 1 6 R6 R5 IN OUT Q13 R8 R9 Q12 3 I Q17 Q 2 R10 +IN Q16 Q15 R11 R12 V S 7 8 Apex Microtechnology Inc. Dec 2019 www.apexanalog.com All rights reserved PA91U Rev OPA91 TYPICAL CONNECTION Figure 2: Typical Connection R F 100 k +V S * 100nF R C C C R F +V S V OUT R C + 1 k C C PA91 CL -V S R L R CL -V S * Use 10F per Amp of Output Current. 100nF * 2 PA91U Rev O