PA90 PA90 P r o d u c t IInnnnoovvaa t i o n FFr roomm 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 R4 5 CC2 Q8 R7 R9 Q12 6 OUT Q13 3 IQ Q15 R11 10 Q11 R6 2 +IN Q4 ILIM 9 Q14B R5 R8 –VS 7 R3 R10 Q17 Q16 R12 8 PA90U http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) JUN 20091 APEX − PA90UREVJ PA90 P r o d u c t I n n o v a t i o nF r o m EXTERNAL CONNECTIONS 1 2 3 4 5 Rc –IN 6 7 8 9 10 11 12 Cc RCL +IN * IQ (See text.) 12-pin SIP PACKAGE STYLE DP * –Vs TO LOAD AND FEEDBACK +Vs Formed leads available See package EE * Bypassing required. 1. Characteristics and Specifications Absolute Maximum Ratings Parameter Symbol Min Max Units SUPPLY VOLTAGE, +VS to -VS 400 V OUTPUT CURRENT, source, sink, peak, within SOA 350 mA POWER DISSIPATION, continuous @ TC = 25°C 30 W 20 V 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 0.5 2 mV 15 50 µV/°C 25 AMPLIFIER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temperature Full temperature range OFFSET VOLTAGE vs. supply 10 OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial 200 BIAS CURRENT vs. supply 4 OFFSET CURRENT, initial 50 INPUT IMPEDANCE, DC 10 INPUT CAPACITANCE 4 ±VS Ŧ 15 COMMON MODE VOLTAGE RANGE (Note 3) COMMON MODE REJECTION, DC VCM = ±90V NOISE 100KHz bandwidth, RS = 1KΩ, CC = OPEN 2 11 80 µV/V µV/kHz 2000 pA pA/V 500 pA Ω pF V 98 dB 1 µV RMS PA90U PA90 P r o d u c t I n n o v a t i o nF r o m Parameter Test Conditions1 Min Typ Max Units GAIN OPEN LOOP @ 15Hz RL = 2KΩ, CC = OPEN 111 dB GAIN BANDWIDTH PRODUCT @ 1MHz RL = 2KΩ, CC = OPEN 94 100 MHz POWER BANDWIDTH RL = 2KΩ, CC = OPEN 470 kHz PHASE MARGIN Full temperature range 60 ° ±VS Ŧ 10 V 300 V/µS OUTPUT IO = 200mA ±VS Ŧ 12 SLEW RATE, A V = 100 CC = OPEN 240 CAPACITIVE LOAD, A V = +1 Full temperature range 470 SETTLING TIME to 0.1% CC = OPEN, 2V step VOLTAGE SWING (Note 3) CURRENT, continuous 200 mA pF RESISTANCE, no load 1 µS 50 Ω POWER SUPPLY VOLTAGE (Note 5) ±40 ±150 ±200 V 10 14 mA RESISTANCE, AC, junction to case (Note 4) Full temp range, F > 60Hz 2.5 °C/W RESISTANCE, DC, junction to case 4.2 °C/W CURRENT, quiescent THERMAL 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 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. +VS R IN 1 11,12 PIEZO DRIVE PA90 6 V OUT 2 COMPUTER FOCUS COMMAND VOLTAGE 7,8 9,10 R CL –V S PA90U 3 P r o d u c t I n n o v a t i o nF r o m POWER DERATING PHASE RESPONSE 90 32 135 16 180 8 0 270 100k 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) 1 DISTORTION, (%) SLEW RATE, (V/μS) 0 0.1 .05 0.15 OUTPUT CURRENT, IO (A) 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 100K N 3.5 80 70 60 50 F 4 100 OPE 4.5 200 4.7p 100 70 50 40 30 5 300 CC= 200 5.5 F 300 POWER RESPONSE 400 10p SLEW RATE 1K 700 500 OUTPUT VOLTAGE SWING 6 F CC = 68 pF 0 CC = 10 pF CC = 4.7 pF –10 CC = OPEN 100K 1M 10M FREQUENCY, F (Hz) 50 100 75 125 CASE TEMPERATURE, TC (°C) 68p 10 1.0 25 CC= 20 1.1 CC= 30 1.2 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 CC = 68 pF CC = 10 pF CC = 4.7 pF CC = OPEN 225 1.3 INPUT NOISE VOLTAGE, V (nV√Hz) 24 NORMALIZED QUIES. CURRENT NORMALIZED QUIESCENT CURRENT, IQ (X) 40 PHASE, Ф (°) INTERNAL POWER DISSIPATION, P(W) PA90 1M 100K FREQUENCY, F (Hz) INPUT NOISE VOLTAGE 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) .2 .15 .1 .05 0 4 0 4 16 20 8 12 24 RESISTOR VALUE, RCL (Ω) PA90U PA90 P r o d u c t I n n o v a t i o nF r o m PHASE COMPENSATION 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 SOA 500 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 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. INPUT PROTECTION OUTPUT CURRENT FROM +VS OR -VS (mA) SAFE OPERATING AREA (SOA) 20 300 0m 10 S 0m S 200 DC ,T 100 ,T C ,T C = 25 °C 85 °C DC 50 = C DC = 12 5° 30 C 20 PULSE CURVES @ 10% DUTY CYCLE MAX. 10 25 50 75 100 125 250 500 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. PA90U SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V) 5 PA90 P r o d u c t I n n o v a t i o nF r o m POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See Figure 2. 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 is 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. +VS Z1 1 –IN Q1 11, 12 Q3 6 PA90 Q2 +IN FIGURE 2. OVERVOLTAGE PROTECTION Q4 2 7, 8 Z2 –VS STABILITY The PA90 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. 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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