PA92 PA92 PP rroodduuPA92 cctt TI encnhonvoal toi go yn FFrroomm High Voltage Power Operational Amplifiers FEATURES DESCRIPTION The PA92 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 4A and pulse currents up to 7A. 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 Power SIP package is electrically isolated. HIGH VOLTAGE -- 400V (200V) LOW QUIESCENT CURRENT -- 10mA HIGH OUTPUT CURRENT -- 4A PROGRAMMABLE CURRENT LIMIT 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 R7 Q14B 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 * -Vs +Vs * Bypassing required. PA92U www.cirrus.com PATENTED 12 12-pin SIP PACKAGE STYLE DP Formed leads available See package style EE Copyright (c) Cirrus Logic, Inc. 2011 (All Rights Reserved) JAN 2011 1 APEX - PA92UREVM PA92 Product Technology From CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min SUPPLY VOLTAGE, +VS to -VS Max Units 400 V 7 A 80 W 20 V OUTPUT CURRENT, source, sink, peak, within SOA POWER DISSIPATION, continuous @ TC = 25C 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 PA92 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 850C to avoid generating toxic fumes. SPECIFICATIONS Parameter Test Conditions Min Typ Max Units 2 10 mV INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temperature Full temperature range 15 50 V/C OFFSET VOLTAGE vs. supply 10 25 V/V OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial 200 BIAS CURRENT vs. supply 4 OFFSET CURRENT, initial 50 INPUT IMPEDANCE, DC 10 INPUT CAPACITANCE 11 4 COMMON MODE VOLTAGE RANGE (Note 3) VS 15 COMMON MODE REJECTION, DC VCM = 90V NOISE 100KHz bandwidth, RS = 1K, CC = 10pF 80 V/kh 2000 pA pA/V 500 pA pF V 98 dB 1 V RMS GAIN OPEN LOOP @ 15Hz RL = 2K, CC = 10pF 111 dB GAIN BANDWIDTH PRODUCT @ 1MHz RL = 2K, CC = 10pF 94 18 MHz POWER BANDWIDTH RL = 2K, CC = 10pF 30 kHz PHASE MARGIN Full temperature range 60 VS 10 V 50 V/S OUTPUT VOLTAGE SWING (Note 3) IO = 4A CURRENT, continuous 4 SLEW RATE, A V = 100 CC = 10pF CAPACITIVE LOAD, A V = +1 Full temperature range 2 VS 12 1 A nF PA92U PA92 Product Technology From Parameter Test Conditions SETTLING TIME to 0.1% Min Typ CC = 10pF, 2V step RESISTANCE, no load Max Units 1 S 10 POWER SUPPLY VOLTAGE (Note 5) 50 150 200 V 10 14 mA 1 C/W 1.5 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 = 25C). 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 0.625 V/C below 25C case. No derating needed above 25C case. TYPICAL PERFORMANCE GRAPHS PHASE RESPONSE 135 20 CC = 150pF CC = 10pF 0 270 100k 25 50 75 100 125 CASE TEMPERATURE, TC (C) OUTPUT VOLTAGE SWING SMALL SIGNAL RESPONSE 40 30 CC = 150pF CC = 100pF CC = 47pF CC = 10pF 20 10 0 1M 10M FREQUENCY, F (Hz) 8.0 7.5 7.0 6.5 0 3 2 1 OUTPUT CURRENT, IO (A) 1.6 1.4 1.2 1.0 25 100 CC = 10pF CC = 47pF CC = 100pF 10 4 , (%) 40 PA92U 30 PO = 1W PO = 20W PO = 62W CC = 150pF 1K 10K 100K FREQUENCY, F (Hz) 1M INPUT NOISE VOLTAGE HARMONIC DISTORTION .1 50 100 125 75 CASE TEMPERATURE, TC (C) POWER RESPONSE 400 8.5 SLEW RATE 60 20 1M 10M FREQUENCY F (Hz) OUTPUT VOLTAGE, VO(VP-P) 0 -10 100K (V/S) CC = 100pF CC = 47pF 225 50 OPEN LOOP GAIN, A (dB) 180 GE, V (nVHz) 40 NORMALIZED QUIESCENT CURRENT NORMALIZED QUIESCENT CURRENT, IQ (X) 60 PHASE, () 90 VOLTAGE DROP FROM SUPPLY, VS - VO (V) INTERNAL POWER DISSIPATION, P(W) POWER DERATING 80 20 15 10 3 10 PA92 0 1M 10M FREQUENCY, F (Hz) 7.0 Product Technology From 6.5 3 2 1 OUTPUT CURRENT, IO (A) DISTORTION, (%) 4 3 .01 2 1 30 60 100 200 300 10 EXT. COMPENSATION CAPACITOR, CC (pF) CC = 47pF CC = 100pF CC = 150pF 1K .001 100 1K FREQUENCY, F (Hz) 10K 100K FREQUENCY, F (Hz) 1M INPUT NOISE VOLTAGE PO = 1W PO = 20W PO = 62W 40 30 10 8 6 CC = 10pF 10 4 .1 20 100 HARMONIC DISTORTION SLEW RATE 60 SLEW RATE, (V/S) 0 INPUT NOISE VOLTAGE, V (nVHz) -10 100K 7.5 OUTPUT VOLTAGE, V 20 VOLTAGE DROP FROM SUPPL OPEN LOOP GAIN, A CC = 10pF 30 10K 20 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) 4 PHASE COMPENSATION 3 GAIN RC 1 150pF 100 2 100pF 100 3 47pF 0 12 10pF 0 *CC Never to be <10pF. CC to be rated for the full supply voltage +V to -Vs. Use ceramic NPO (COG) type. 2 1 0 0.0 CC* 0.2 0.4 0.6 0.8 1.0 1.2 RESISTOR VALUE, RCL () 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 .65 RCL = ILIM 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. 4 SOA 8 6 OUTPUT CURRENT FROM +VS OR -VS, (A) 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. DC, TC = 25C 200mS 4 2 10 0m 1 .8 .6 T C T C .4 .3 = S = 85 C 12 5C .2 .1 .08 .06 .04 10 20 30 40 60 80 100 200 300 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V) PA92U PA92 Product Technology From 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 Although the PA92 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, Q1Q4 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 +VS Z1 1 -IN Q1 11, 12 Q3 PA90 Q2 +IN 6 Q4 2 7, 8 Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See Figure 2. The zeners clamp transients FIGURE 2. Z2 to voltages within the power supply rating and also clamp power supply OVERVOLTAGE -VS reversals to ground. Whether the zeners are used or not, the system PROTECTION 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. STABILITY The PA92 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. PA92U 5 PA92 Product Technology 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 apex.support@cirrus.com. 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. 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