PA91EE

PA91 High Voltage Power Operational Amplifiers RoHS COMPLIANT FEATURES • • • • • High Voltage — 450V (±225V) Low Quiescent Current — 10mA High Output Current — 200mA Programmable Current Limit High Slew Rate— 300V/µs 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 operating 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 Microtechnology’s 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 +VS R1 R2 Q1 C1 R3 Q3 Q2 R4 Q4 5 Q6 4 Q5 Q14A Q8 CC1 Q14B 1 –IN ICL 9 CC2 R7 6 OUT R6 R5 R8 R9 Q12 Q13 3 IQ 2 +IN Q15 R11 10 Q11 R10 Q17 Q16 R12 –VS 7 8 www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Dec 2019 PA91U Rev O PA91 TYPICAL CONNECTION Figure 2: Typical Connection RF +V S * 100 k 100nF RC CC RF +V S + PA91 -V S RCL CC CL RL -V S * Use 10μF per Amp of Output Current. * 2 V OUT RC 1k 100nF PA91U Rev O PA91 PINOUT AND DESCRIPTION TABLE Figure 3: External Connections Pin Number Name Description 1 2 -IN +IN 3 IQ 4 RC 5 CC 6 OUT 7, 8 -VS 9, 10 CL 11, 12 +VS The inverting input. The non-inverting input. Quiescent current reduction pin. Connect to pin 5 to disable the AB bias. See applicable section. Compensation resistor connection. Select value based on Phase Compensation. See applicable section. Compensation capacitor connection. Select value based on Phase Compensation. See applicable section. The output. Connect this pin to load and to the feedback resistors. The negative supply rail. Pins 7 and 8 are not internally connected and must be shorted. Connect to the current limit resistor. Output current flows into/out of these pins through RCL. The output pin and the load are connected to the other side of RCL. Pins 9 and 10 are internally connected. The positive supply rail. Pins 11 and 12 are internally connected. PA91U Rev O 3 PA91 SPECIFICATIONS All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TC = 25°C ABSOLUTE MAXIMUM RATINGS Parameter Symbol Supply Voltage, total Output Current, source, sink, peak, within SOA Power Dissipation, continuous @ Tc = 25°C Input Voltage, differential Input Voltage, common mode Min Max Units +VS to -VS 450 V IOUT 350 mA PD 30 W VIN (Diff) -20 20 V VCM -VS VS V 260 °C 150 °C -55 +125 °C -40 +85 °C Temperature, pin solder, 10s max. Temperature, junction Temperature Range, storage TJ Operating Temperature Range, case TC 1 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. CAUTION The PA91 is constructed from MOSFET transistors. ESD handling procedures must be observed. The substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. INPUT Parameter Offset Voltage, initial Offset Voltage vs. Temperature Offset Voltage vs. Supply Offset Voltage vs. Time Bias Current, initial Bias Current vs. Supply Offset Current, initial Test Conditions Min Full temp range Input Impedance, DC Input Capacitance Common Mode Voltage Range 1 Typ Max Units 0.5 15 10 75 200 4 50 2 50 25 mV µV/°C µV/V µV/kh pA pA/V pA VCM = ±90V Noise 100 kHz bandwidth, RS = 1 kΩ, CC = OPEN 80 500 1011 Ω 4 pF V ±VS Ŧ 15 Common Mode Rejection, DC 2000 98 dB 1 µV RMS 1. +VS and –VS denote the positive and negative power supply rail respectively. 4 PA91U Rev O PA91 GAIN Parameter Min Typ 94 111 dB Gain Bandwidth Product @ 1 MHz RL = 2 kΩ, CC = OPEN 100 MHz Power Bandwidth RL = 2 kΩ, CC = OPEN 470 kHz Phase Margin Full temp range 60 ° Open Loop @ 15 Hz Test Conditions RL = 2 kΩ, CC = OPEN Max Units OUTPUT Parameter Test Conditions Min Typ ±VS Ŧ 12 ±VS Ŧ 10 Voltage Swing 1 IOUT = 200mA Current, continuous Slew Rate, A V = 100 CC = OPEN 240 Capacitive Load, AV = +1 Full temp range 470 Settling Time to 0.1% CC = OPEN, 2V step Max V 200 Resistance, no load Units mA 300 V/µs pF 1 µs 50 Ω 1. +VS and –VS denote the positive and negative power supply rail respectively. POWER SUPPLY Parameter Test Conditions Min Typ Max Units ±40 ±150 ±225 V 10 14 mA Max Units Full temp range, F > 60 Hz 2.5 °C/W Full temp range, F < 60 Hz Full temp range Meets full range specs 4.2 °C/W °C/W °C Voltage 1 Current, quiescent 1. Derate max supply rating 0.625 V/°C below 25°C case. No derating needed above 25°C case. THERMAL Parameter Resistance, AC, junction to case 1 Resistance, DC, junction to case Resistance, junction to air Temperature Range, case Test Conditions Min Typ 30 -25 +85 1. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. PA91U Rev O 5 PA91 TYPICAL PERFORMANCE GRAPHS Figure 4: Power Derating Figure 5: Normalized Quiescent Current 1.3 Normalized Quiescent Current, IQ (X) /ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;t) 40 32 Output Stage 24 16 8 0 0 25 50 75 100 125 1.2 1.1 1.0 25 150 Case Temperature, TC (°C) 50 75 100 125 Case Temperature, TC (°C) Figure 6: Small Signal Response Figure 7: Phase Response 90 50 135 30 Phase, ˇ;Σ) Open Loop Gain, A (dB) 40 20 10 0 CC = 68pF CC = 10pF CC = 4.7pF CC = OPEN -10 100k 225 1M Frequency, F (Hz) 6 180 10M 270 100k CC = 68pF CC = 10pF CC = 4.7pF CC = OPEN 1M 10M Frequency, F (Hz) PA91U Rev O PA91 Figure 9: Power Response 500 6 5.5 100 90 80 70 60 50 10k Output Current, IOUT (A) 100k 1M Frequency, F (Hz) Figure 10: Slew Rate Figure 11: Harmonic Distortion 1000 700 500 1 300 0.1 ŝƐƚŽƌƟŽŶ;й) Slew Rate (V/μs) N OPE 0.2 CC= 0.15 F 0.1 4.7p 0.05 CC= 0 F 3.5 10p 4 F 4.5 200 CC= 5 300 68p Output Voltage, VOUT (VP-P) 400 CC= Voltage Drop From Supply, VS-VOUT (V) Figure 8: Output Voltage Swing 200 100 70 40 30 RLсϭŬɏ VS = 200V AV = 63 PO = 17.6W PO = 1W 0.01 PO = 5W 20 10 0.1 0.001 1 10 džƚ͘ŽŵƉĞŶƐĂƟŽŶĂƉĂĐŝƚŽƌ͕C (pF) PA91U Rev O 100 10 100 1k 10k 100k Frequency, F (Hz) 7 PA91 Figure 12: Input Noise Voltage Figure 13: Current Limit 0.2 15 Current Limit, ICL (A) Input Noise Voltage, V (Ŷsͬя,nj) 20 10 7 5 0.1 0.05 3 2 10 0 100 1k Frequency, F (Hz) 8 0.15 10k 100k 0 4 8 12 16 20 24 Resistor Value, RCL (ɏ) PA91U Rev O PA91 SAFE OPERATING AREA (SOA) The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external load. The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs. Note: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. Figure 14: SOA KƵƚƉƵƚƵƌƌĞŶƚ&ƌŽŵнVS ŽƌͲVS ;ŵA) 500 ϮϬ 300 Ϭŵ ϭϬ Ϭŵ Ɛ 200 Ɛ  ͕d 100  ͕d C  ͕d 50 C =2 C 5° =8 C 5° C =1 25 30 °C 20 10 25 50 75 100 125 250 500 ^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕VS-VOUT (V) PA91U Rev O 9 PA91 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.apexanalog.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and Evaluation Kits. TYPICAL APPLICATION LOW POWER, PIEZOELECTRIC POSITIONING Piezo positioning may be applied to the focusing of segmented mirror systems. The composite mirror may be composed of hundreds of elements, each requiring focusing 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. Figure 15: Typical Application PHASE COMPENSATION Gain CC* RC ≥1 ≥5 ≥10 ≥30 68pF 10pF 4.7pF NONE 100 Ω 100 Ω 0Ω 0Ω *CC To be rated for the full supply voltage +VS to –VS. Use NPO ceramic (COG) type. 10 PA91U Rev O PA91 CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the typical connection diagram. For optimum reliability the resistor value should be set as high as possible. The value is calculated as follows; with the maximum practical value of 32 ohms. 0.65V R CL    = ---------------I CL  A  INPUT PROTECTION Although the PA91 can withstand differential voltages up to ±20V, additional external protection is recommended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 16). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. Figure 16: Overvoltage Protection POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See Figure 16. The zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. Whether the zeners are used or not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. Conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or protected against. Reversals or opens on the negative supply rail are known to induce input stage failure. Unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible. PA91U Rev O 11 PA91 STABILITY The PA91 is externally compensated and performance can be tailored to the application. Use the graphs of small signal response and power response as a guide. The compensation capacitor CC must be rated at 500V working voltage. An NPO capacitor is recommended. The compensation network CCRC must be mounted closely to the amplifier pins 4 and 5 to avoid spurious oscillation. QUIESCENT CURRENT REDUCTION When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This raises distortion since the output stage is then class C biased, but reduces the quiescent current by 1mA for a power dissipation savings of 0.4W. Pin 3 may be left open if not used. 12 PA91U Rev O PA91 PACKAGE OPTIONS Part Number Apex Package Style Description PA91 PA91EE DP EE 12-Pin SIP 12-Pin SIP w/ formed leads PACKAGE STYLE DP PA91U Rev O 13 PA91 PACKAGE STYLE EE NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may be trademarks of their respective holders. 14 PA91U Rev O