PA85PA85 • PA85A • PA85A PPA85, r o d u c t IPA85A Innnnoovvaa t i o n FFr roomm High Voltage Power Operational Amplifiers FEATURES • HIGH VOLTAGE — 450V (±225V) • HIGH SLEW RATE — 1000V/μs • HIGH OUTPUT CURRENT — 200mA APPLICATIONS PATENTED • HIGH VOLTAGE INSTRUMENTATION • PIEZO TRANSDUCER EXCITATION • PROGRAMMABLE POWER SUPPLIES UP TO 430V • ELECTROSTATIC TRANSDUCERS & DEFLECTION TYPICAL APPLICATION Dynamic focusing is the active correction of focusing voltage as a beam traverses the face of a CRT. This is necessary in high resolution flat face monitors since the distance between cathode and screen varies as the beam moves from the center of the screen to the edges. PA85 lends itself well to this function since it can be connected as a summing amplifier with inputs from the nominal focus potential and the dynamic correction. The nominal might be derived from a potentiometer, or perhaps automatic focusing circuitry might be used to generate this potential. The dynamic correction is generated from the sweep voltages by calculating the distance of the beam from the center of the display. DESCRIPTION The PA85 is a high voltage, high power bandwidth MOSFET operational amplifier designed for output currents up to 200mA. Output voltages can swing up to ±215V with a dual supply and up to +440 volts with a single supply. The safe operating area (SOA) has no second breakdown limitations and can be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a bootstrapped zener-MOSFET current source. As a result, the PA85 features an unprecedented supply range and excellent supply rejection. The MOSFET output stage is biased on for linear operation. External compensation provides user flexibility. This hybrid circuit utilizes thick film (cermet) resistors, ceramic capacitors and silicon semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible isolation washers voids the warranty. RIN1 DC FOCUS RF +225V X SWEEP SAMPLE z= Q4 3 +VS D23 COMP 7 8 –IN 5 Q6 Q10A Q7 Q10B +IN 4 EXTERNAL CONNECTIONS Q9 Q8 CL Q11 1 OUT Q16 PA85U http://www.cirrus.com –VS 6 Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) RCL CL 3 2 1 OUT +IN 4 TOP VIEW –IN 5 8 –Vs Q18 D2 +Vs 2 Q12 Q17 Q13 TO FOCUS GRID PA85 Y SWEEP SAMPLE -225V D1 Q2 RCL RIN2 x2+y2 EQUIVALENT SCHEMATIC Q1 8-pin TO-3 PACKAGE STYLE CE 6 COMP CC 7 COMP RC PHASE COMPENSATION RC Gain CC 1 68pF 100Ω 20 10pF 330Ω 100 3.3pF 0Ω CC RATED FOR FULL SUPPLY VOLTAGE MAY 20091 APEX − PA85UREVO PA85 • PA85A ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PARAMETER P r o d u c t I n n o v a t i o nF r o m SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, continuous @ TC = 25°C2 INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case TEST CONDITIONS 1 INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial3 BIAS CURRENT, vs. supply OFFSET CURRENT, initial3 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE4 COMMON MODE REJECTION, DC NOISE Full temperature range VCM = ±90V 100kHz BW, RS = 1KΩ, CC = 10pf GAIN OPEN LOOP, @ 15Hz RL = 2KΩ, CC = OPEN GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 3.3pf POWER BANDWIDTH CC = 10pf CC = 3.3pf PHASE MARGIN Full temperature range OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE, AV = 20 SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load POWER SUPPLY VOLTAGE6 CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case MIN IO = ±200mA IO = ±75mA IO = ±20mA TC = 85°C CC = 10pf CC = OPEN Full temperature range CC = 10pf, 2V step RCL = 0 Full temperature range Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications ±VS–15 90 96 PA85 TYP .5 10 3 75 5 .01 10 1011 4 110 1 111 100 300 500 60 ±Vs–10 ±Vs–6.5 ±V–8.5 ±Vs–6.0 ±V–8.0 ±Vs–5.5 ±200 400 1000 470 1 50 ±15 –25 ±150 21 30 450V 200mA 30W ±25V ±VS 300°C 150°C –65 to +150°C –55 to +125°C PA85A MAX MIN TYP MAX 2 .25 .5 30 5 10 10 * * * 50 3 10 * 100 3 30 * * * * * * * UNITS mV µV/°C µV/V µV/√kh pA pA/V pA Ω pF V dB µVrms * * * * * dB MHz kHz kHz ° * * * * * * * * 700 * * * * * V V V mA V/µs V/µs pf µs Ω ±225 * 25 * * * * 2.5 * 4.2 * * +85 * * V mA °C/W °C/W °C/W °C NOTES: * The specification of PA85A is identical to the specification for PA85 in applicable column to the left. 1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power supply voltage is typical rating. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. Ratings apply only to output transistors. An additional 10W may be dissipated due to quiescent power. 3. Doubles for every 10°C of temperature increase. 4. +VS and –VS denote the positive and negative power supply rail respectively. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. CAUTION 2 The PA85 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. PA85U PA85 • PA85A PHASE RESPONSE 0 –45 16 8 –135 –180 –225 C 5° 5 0 DISTORTION, (%) COMMON MODE REJECTION CC = 10pF 120 100 80 60 40 20 1K PA85U 10K 100K 1M FREQUENCY, F (Hz) 10M POWER SUPPLY REJECTION, PSR (dB) COMMON MODE REJECTION, CMR (dB) 140 50 RL = 2KΩ 250 HARMONIC DISTORTION AV = 30 PO = 15W CC = 10pf RL = 1KΩ .01 .005 .003 .001 10 15 45 90 0 60 30 75 EXT. COMPENSATION CAPACITOR, CC (pF) 75 25 50K 100K 200K 500K 1M 2M FREQUENCY, F (Hz) 100 1K 10K FREQUENCY, F (Hz) 100K 15 10 7 5 3 2 10 POWER SUPPLY REJECTION 120 300 80 60 40 20 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 1K 100 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT 500 100 5M INPUT NOISE VOLTAGE 20 140 CURRENT LIMIT, ILIM (mA) SLEW RATE, (V/μS) 100 200 100 OUTPUT CURRENT, IO (mA) f 55°C TC = – 125 100 f TC 6 C = 25° 250 .3p 7 .03 200 POWER RESPONSE =3 8 .05 500 100 300 400 450 200 TOTAL SUPPLY VOLTAGE, VS (V) 0p SLEW RATE 1000 0 =1 1K 10K .1M 1M 10M 20M FREQUENCY, F (Hz) .90 CC 100 .95 500 9 4 TC = –55°C f –20 10 1.00 T C = 25°C 8p CC = 68pF 0 1.05 °C 125 =6 20 TC = CC CC = 10pF 40 1.10 OUTPUT VOLTAGE SWING 10 12 80 40M 1.15 CC CC = 3.3pF 1M 10M FREQUENCY F (Hz) = 100 60 –270 .2M 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE CC = 3.3pF C 0 120 OPEN LOOP GAIN, A (dB) CC = 10pF T 0 CC = 68pF –90 OUTPUT VOLTAGE, VO (VPP) 24 QUIESCENT CURRENT 1.20 INPUT NOISE VOLTAGE, VN (nV/ √Hz) PHASE, Ф (°) 32 NORMALIZED QUIESCENT CURRENT, IQ (X) POWER DERATING 40 VOLTAGE DROP FROM SUPPLY, VS – VO (V) OUTPUT STAGE INTERNAL POWER DISSIPATION, P(W) P r o d u c t I n n o v a t i o nF r o m 200 100 50 20 1 2 20 30 5 10 RESISTOR VALUE, RCL (Ω) 3 PA85 • PA85A P r o d u c t I n n o v a t i o nF r o m GENERAL SAFE OPERATING CURVES 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 and heat sink selection. The "Application Notes" and "Technical Seminar" sections contain a wealth of information on specific types of applications. Package outlines, heat sinks, mounting hardware and other accessories are located in the "Packages and Accessories" section. Evaluation Kits are available for most Apex Precision Power product models, consult the "Evaluation Kit" section for details. For the most current version of all Apex Precision Power product data sheets, visit www.Cirrus.com. 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. This is not the same as the absolute maximum internal power dissipation listed elsewhere in the specification since the quiescent power dissipation is significant compared to the total. CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 1.4 ohm, however 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 30 ohms. .7 RCL = ILIM - .016 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. SOA OUTPUT CURRENT FROM +VS OR –VS, (mA) 500 20 300 0m ,T 50 ,T C STABILITY The PA85 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 7 and 8 to avoid spurious oscillation. = +VS = Z1 25 °C 85 = 12 5° C 5 –IN Q1 °C DC 3 Q3 PA85 +IN Q2 Q4 4 6 30 Z2 20 10 25 4 C C Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. 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. S DC ,T POWER SUPPLY PROTECTION 0m DC 100 Although the PA85 can withstand differential voltages up to ±25V, additional external protection is recommended. Since the PA85 is a high speed amplifier, 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. 10 S 200 INPUT PROTECTION –VS FIGURE 2. OVERVOLTAGE PROTECTION PULSE CURVES @ 10% DUTY CYCLE MAX 50 75 100 125 250 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V) PA85U P r o d u c t I n n o v a t i o nF r o m PA85 • PA85A 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. 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