PA90 PA90 ® Product Innovation From PA90 High Voltage Power Operational Amplifiers FEATURES DESCRIPTION The PA90 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 type loads 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 Precision Power’s Power SIP package uses a minimum of board space allowing for high density circuit boards. The 12pin PowerSIP package is electrically isolated. ♦ HIGH VOLTAGE — 400V (±200V) ♦ 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 390V EQUIVALENT SCHEMATIC 12 11 +VS R1 R2 Q1 C1 Q3 Q2 Q6 4 CC1 Q5 Q14A 1 –IN R3 R4 5 CC2 ILIM 9 Q8 Q14B R7 R8 R9 Q12 6 OUT Q13 3 IQ 2 +IN R10 Q17 Q16 Q15 R11 –VS 7 10 Q11 R6 R5 Q4 R12 8 EXTERNAL CONNECTIONS 1 2 3 4 Rc –IN 5 6 7 8 * IQ (See text.) 10 11 Cc RCL +IN 9 TO LOAD AND FEEDBACK 12 * –Vs 12-pin SIP PACKAGE STYLE DP Formed leads available See package EE +Vs * Bypassing required. PA90U www.cirrus.com Copyright © Cirrus Logic, Inc. 2010 (All Rights Reserved) MAR 20101 APEX − PA90UREVK ® PA90 Product Innovation From 1. CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Max Units SUPPLY VOLTAGE, +VS to -VS Parameter Symbol Min 400 V OUTPUT CURRENT, source, sink, peak, within SOA 350 mA 30 W 20 V POWER DISSIPATION, continuous @ TC = 25°C INPUT VOLTAGE, differential -20 INPUT VOLTAGE, common mode -VS VS V TEMPERATURE, pin solder, 10s max. 260 °C TEMPERATURE, junction (Note 2) 150 °C TEMPERATURE RANGE, storage −40 85 °C OPERATING TEMPERATURE RANGE, case −25 85 °C CAUTION The PA90 is constructed from MOSFET transistors. ESD handling procedures must be observed. The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. SPECIFICATIONS Parameter Test Conditions1 Min Typ Max Units AMPLIFIER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temperature Full temperature range OFFSET VOLTAGE vs. supply 0.5 2 mV 15 50 µV/°C 10 25 µV/V OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial 200 BIAS CURRENT vs. supply µV/kHz 2000 4 OFFSET CURRENT, initial 50 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE (Note 3) VCM = ±90V NOISE 100KHz bandwidth, RS = 1KΩ, CC = OPEN 80 pA/V 500 pA 1011 Ω 4 pF ±VS Ŧ 15 COMMON MODE REJECTION, DC pA V 98 dB 1 µV RMS 111 dB GAIN OPEN LOOP @ 15Hz RL = 2KΩ, CC = OPEN 94 GAIN BANDWIDTH PRODUCT @ 1MHz RL = 2KΩ, CC = OPEN 100 MHz POWER BANDWIDTH RL = 2KΩ, CC = OPEN 470 kHz PHASE MARGIN Full temperature range 60 ° OUTPUT VOLTAGE SWING (Note 3) IO = 200mA CURRENT, continuous ±VS Ŧ 12 SLEW RATE, A V = 100 CC = OPEN 240 CAPACITIVE LOAD, A V = +1 Full temperature range 470 2 ±VS Ŧ 10 200 V mA 300 V/µS pF PA90U ® PA90 Product Innovation From Parameter Test Conditions1 SETTLING TIME to 0.1% Min Typ CC = OPEN, 2V step RESISTANCE, no load Max Units 1 µS 50 Ω POWER SUPPLY VOLTAGE (Note 5) ±40 ±150 ±200 V 10 14 mA 2.5 °C/W 4.2 °C/W CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case (Note 4) Full temp range, F > 60Hz RESISTANCE, DC, junction to case Full temp range, F < 60Hz RESISTANCE, junction to air Full temp range TEMPERATURE RANGE, case Meets full range specifications 30 °C/W -25 +85 °C NOTES: 1. (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). 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 3. +VS and –VS denote the positive and negative power supply rail respectively. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. TYPICAL APPLICATION RF LOW POWER, PIEZOELECTRIC POSITIONING +VS 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 PA90 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. R IN 1 COMPUTER FOCUS COMMAND VOLTAGE 7,8 0 270 100k 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) 40 1.1 1.0 25 OUTPUT VOLTAGE SWING 50 100 75 125 CASE TEMPERATURE, TC (°C) POWER RESPONSE 400 300 200 N OPE F 4.7p 68 F 10p 4.5 1.2 CC= 5 1M 10M FREQUENCY F (Hz) NORMALIZED QUIES. CURRENT 1.3 CC= 10 5.5 R CL CC= 20 6 9,10 CC= 30 PA90U P FROM SUPPLY, VS – VO (V) SMALL SIGNAL RESPONSE 50 LOOP GAIN, A (dB) CC = 68 pF CC = 10 pF CC = 4.7 pF CC = OPEN 225 8 0 180 T VOLTAGE, VO (VP-P) 16 NORMALIZED QUIESCENT CURRENT, IQ (X) 135 24 V OUT –V S PHASE RESPONSE 32 6 2 90 PHASE, Ф (°) INTERNAL POWER DISSIPATION, P(W) POWER DERATING PIEZO DRIVE PA90 TYPICAL PERFORMANCE GRAPHS 40 11,12 3 16 180 8 PA90 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) DISTORTION, (%) SLEW RATE, (V/μS) 0.2 HARMONIC DISTORTION .1 PO = 17.6W .01 PO = 1W PO = 5W 20 10 0.1 10 100 1 EXT. COMPENSATION CAPACITOR, CC (pF) .001 10 100 1K 10K FREQUENCY, F (Hz) 10K 20 RL = 1KΩ VS = 200V AV = 63 N 1 0.1 .05 0.15 OUTPUT CURRENT, IO (A) F 0 OPE 3.5 80 70 60 50 4.7p 100 70 50 40 30 4 100 CC= 200 4.5 200 F 300 5 300 10p SLEW RATE 1K 700 500 5.5 F CC = 68 pF 0 CC = 10 pF CC = 4.7 pF –10 CC = OPEN 100K 1M 10M FREQUENCY, F (Hz) POWER RESPONSE 400 68p 10 OUTPUT VOLTAGE SWING 6 CC= 20 50 100 75 125 CASE TEMPERATURE, TC (°C) CC= 30 1.0 25 CC= OPEN LOOP GAIN, A (dB) 40 VOLTAGE DROP FROM SUPPLY, VS – VO (V) SMALL SIGNAL RESPONSE 50 1M 10M FREQUENCY F (Hz) OUTPUT VOLTAGE, VO (VP-P) 0 Product Innovation From 270 100k 1.1 INPUT NOISE VOLTAGE, V (nV√Hz) 0 CC = 68 pF CC = 10 pF CC = 4.7 pF ® CC = OPEN 225 1.2 NORMALIZED QUIESCENT C PHASE, Ф (°) INTERNAL POWER DISSI 24 1M 100K FREQUENCY, F (Hz) INPUT NOISE VOLTAGE 15 10 100K 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) .2 PHASE COMPENSATION .15 .1 .05 0 0 4 16 20 8 12 24 RESISTOR VALUE, RCL (Ω) GAIN ≥1 ≥5 ≥10 ≥30 CC* 68pF 10pF 4.7pF NONE RC 100Ω 100Ω 0Ω 0Ω *CC To be rated for the full supply voltage +VS to –VS. Use NPO ceramic (COG) type. 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; heat sink selection; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external 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. .65 RCL = ILIM 4 PA90U ® PA90 Product Innovation From SAFE OPERATING AREA (SOA) 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. SAFE OPERATING CURVES INPUT PROTECTION Although the PA90 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 2). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. POWER SUPPLY PROTECTION SOA 500 OUTPUT CURRENT FROM +VS OR -VS (mA) 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. 20 300 0m 10 S 0m S 200 DC ,T 100 C DC ,T C ,T C 25 °C 85 °C DC 50 = = = 12 5° 30 C 20 Unidirectional zener diode transient suppressors are PULSE CURVES @ 10% DUTY CYCLE MAX. recommended as protection on the supply pins. See 10 Figure 2. The zeners clamp transients to voltages within 25 75 100 125 250 500 50 the power supply rating and also clamp power supply SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V) reversals to ground. Whether the zeners are used or not, +VS the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as Z1 line regulation. Conditions which can cause open circuits or polarity reversals on either –IN 1 11, 12 power supply rail should be avoided or protected against. Reversals or Q1 Q3 6 opens on the negative supply rail is known to induce input stage failure. PA90 Unidirectional transzorbs prevent this, and it is desirable that they be Q2 Q4 +IN both electrically and physically as close to the amplifier as possible. 7, 8 2 STABILITY FIGURE 2. Z2 The PA90 is externally compensated and performance can be tailored OVERVOLTAGE –VS to the application. Use the graphs of small signal response and power PROTECTION 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. PA90U 5 PA90 ® Product Innovation From CONTACTING CIRRUS LOGIC SUPPORT For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. 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