PA93/27 PA93/27 P r o d u c t IInnnnoovvaa t i o n FFr roomm High Voltage Power Operational Amplifiers FEATURES DESCRIPTION The PA93/27 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 8A and pulse currents up to 14A. 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’s Power SIP package uses a minimum of board space allowing for high density circuit boards. The Power SIP package is electrically isolated. ♦ HIGH VOLTAGE — 400V (±200V) ♦ LOW QUIESCENT CURRENT — 10mA ♦ HIGH OUTPUT CURRENT — 8A ♦ PROGRAMMABLE CURRENT LIMIT APPLICATIONS ♦ PIEZOELECTRIC POSITIONING ♦ HIGH VOLTAGE INSTRUMENTATION ♦ ELECTROSTATIC TRANSDUCERS ♦ PROGRAMMABLE POWER SUPPLIES UP TO 390V EQUIVALENT SCHEMATIC +VS R1A C1 R1B Q1 R3 Q3 Q2 R4 Q4 Q6 CC2 Q5 CC1 Q14A –IN R9 Q12 OUT Q13 R15 Q15 www.cirrus.com R7 Q11 R6 +IN PA93/27U Q8 Q14B R5 R8 –VS ILIM R11 Q18 Q16 R12 Copyright © Cirrus Logic, Inc. 2010 (All Rights Reserved) MAR 20101 APEX - PA93-27UREVD PA93/27 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 PATENTED Cc RCL +IN IQ (See text.) * –Vs * TO LOAD AND FEEDBACK 12-pin SIP PACKAGE STYLE DP +Vs Formed leads available See package style EE * Bypassing required. 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 14 A POWER DISSIPATION, continuous @ TC = 25°C 125 W INPUT VOLTAGE, differential -20 20 V 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 PA93/27 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 INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temperature Full temperature range OFFSET VOLTAGE vs. supply 2 10 mV 15 50 µV/°C 10 25 µV/V OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial 200 BIAS CURRENT vs. supply 4 OFFSET CURRENT, initial 50 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE (Note 3) VCM = ±90V NOISE 100KHz bandwidth, RS = 1KΩ, CC = 10pF 80 pA pA/V 500 pA 1011 Ω 4 pF ±VS Ŧ 15 COMMON MODE REJECTION, DC 2 µV/kHz 2000 V 98 dB 1 µV RMS PA93/27U PA93/27 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 94 Max Units GAIN OPEN LOOP, @ 15Hz RL = 2KΩ, CC = 10pF 111 dB GAIN BANDWIDTH PRODUCT @ 1MHz RL = 2KΩ, CC = 10pF 12 MHz POWER BANDWIDTH RL = 2KΩ, CC = 10pF 30 kHz PHASE MARGIN Full temp range 60 ° ±VS Ŧ 10 V OUTPUT VOLTAGE SWING (Note 3) IO = 8A ±VS Ŧ 12 CURRENT, continuous 8 SLEW RATE, A V = 100 CC = 10pF CAPACITIVE LOAD, A V = +1 Full temp range SETTLING TIME to 0.1% CC = 10pF, 2V step A 50 V/µS 1 µS 10 Ω 1 nF RESISTANCE, no load POWER SUPPLY VOLTAGE (Note 5) ±40 ±150 ±200 V CURRENT, quiescent 9.5 11 14 mA 0.7 °C/W 1 °C/W 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. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100 CC = 220pF. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal 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 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 PA93/27 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. RF +VS R IN 1 11,12 PIEZO DRIVE PA93 6 V OUT 2 COMPUTER FOCUS COMMAND VOLTAGE 7,8 9,10 R CL –V S PA93/27U 3 PA93/27 PHASE RESPONSE 90 100 PHASE, Ф (°) 135 75 50 180 270 100k 25 50 75 100 125 CASE TEMPERATURE, TC (°C) 40 30 20 10 0 –10 100K 1M 10M FREQUENCY, F (Hz) 6 0 4 2 6 OUTPUT CURRENT, IO (A) PO = 1W PO = 20W PO = 62W 40 30 DISTORTION, (%) 4 3 .01 2 1 10 20 30 40 60 100 200 300 EXT. COMPENSATION CAPACITOR, CC (pF) 1.2 1.0 25 100 .001 75 125 50 100 CASE TEMPERATURE, TC (°C) CC = 100pF CC = 220pF 10 1K 8 100 1K FREQUENCY, F (Hz) 10K CC = 10pF CC = 47pF 10K 100K FREQUENCY, F (Hz) 1M INPUT NOISE VOLTAGE HARMONIC DISTORTION .1 10 8 6 1.4 POWER RESPONSE 7 SLEW RATE 60 20 1.6 400 8 5 NORMALIZED QUIES. CURRENT 1.8 OUTPUT VOLTAGE SWING 9 INPUT NOISE VOLTAGE, VN (nV√Hz) OPEN LOOP GAIN, A (dB) CC = 220pF CC = 100pF CC = 47pF CC = 10pF VOLTAGE DROP FROM SUPPLY, VS – VO (V) SMALL SIGNAL RESPONSE 1M 10M FREQUENCY F (Hz) OUTPUT VOLTAGE, VO (VP-P) 0 50 SLEW RATE, (V/μS) CC = 220pF CC = 100pF CC = 47pF CC = 10pF 225 25 0 NORMALIZED QUIESCENT CURRENT, IQ (X) POWER DERATING 125 INTERNAL POWER DISSIPATION P r o d u c t I n n o v a t i o nF r o m 20 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) 8 6 4 2 0 0 .1 .4 .2 .3 .5 .6 RESISTOR VALUE, RCL (Ω) This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. PA93-27U REV A OCTOBER 2006 © 2006 Apex Microtechnology Corp. PA93/27U 4 PA93/27 P r o d u c t I n n o v a t i o nF r o m PHASE COMPENSATION GAIN CC* RC ≥1 220pF 100Ω ≥2 100pF 100Ω ≥4 47pF 0Ω ≥17 10pF 0Ω *CC Never to be <10pF. CC to be rated for the full supply voltage +VS to -VS. Use ceramic NPO (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’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 16 ohms. .65 RCL = ILIM SAFE OPERATING AREA (SOA) 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, (A) 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. 20 SOA DC, TC = 25C 10 8 6 200mS 4 3 10 0m 2 DC ,T 1 .8 .6 C DC ,T C .4 .3 =1 S =8 5C 25 C .2 .1 .08 .06 10 20 30 40 60 80 100 200 300 500 Although the PA93/27 can withstand differential voltages SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V) 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. PA93/27U 5 PA93/27 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 PA93 Q2 +IN FIGURE 2. OVERVOLTAGE PROTECTION Q4 2 7, 8 Z2 –VS STABILITY The PA93/27 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 lowers quiescent power but also raises distortion since the output stage is then class C biased. The output stage bias current is nominally set at 1mA. 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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