Innovation P r o d u c t PA98A PA98, PA98 • PA98A PA98 • PA98A From Power Operational Amplifiers DESCRIPTION FEATURES The PA98 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 PA98 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 Power SIP package is electrically isolated. ♦ HIGH VOLTAGE — 450V (±225V) ♦ HIGH SLEW RATE — 1000V/μS ♦ HIGH OUTPUT CURRENT — 200mA APPLICATIONS ♦ HIGH VOLTAGE INSTRUMENTATION ♦ PIEZO TRANSDUCER EXCITATION ♦ PROGRAMMABLE POWER SUPPLIES UP TO 430V ♦ ELECTROSTATIC TRANSDUCERS & DEFLECTION EQUIVALENT SCHEMATIC 11 +VS D1 Q1 Q2 Q3 D23 COMP 4 –IN 1 Q6 Q10A Q7 Q10B +IN 2 Q8 5 Q9 12 +VS Q12 9 CL 10 CL Q11 6 OUT Q17 Q18 Q13 Q15 D2 8 –VS 7 –VS PA98U www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) NOV 20091 APEX − PA98REVK PA98 • PA98A Product Innovation From EXTERNAL CONNECTIONS 1 2 3 4 5 6 7 8 9 11 10 12 NC Rc –IN Cc RCL +IN * TO LOAD AND FEEDBACK PATENTED * –Vs 12-pin SIP PACKAGE STYLE DP +Vs * Bypassing required. Formed leads available Package style EE 1. CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Max Units SUPPLY VOLTAGE, +VS to -VS Parameter Symbol Min 450 V OUTPUT CURRENT, continuous within SOA 200 mA POWER DISSIPATION, continuous @ TC = 25°C (Note 2) 30 W INPUT VOLTAGE, differential -25 25 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 PA98 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 PA98 Min PA98A Typ Max 0.5 Min Typ Max Units 2 0.25 0.5 mV INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temp Full temp range 10 30 5 10 µV/°C OFFSET VOLTAGE vs. supply 3 10 * * µV/V OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial (Note 3) 5 50 3 BIAS CURRENT, vs. supply 0.01 OFFSET CURRENT, initial (Note 3) 10 INPUT IMPEDANCE, DC COMMON MODE REJECTION, VCM = ±90V DC 2 100 3 4 ±VS - 15 90 * pA pA/V 30 pA * Ω * pF * 110 µV/kHz 10 * 1011 INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE (Note 4) * V * dB PA98U PA98 • PA98A Product Innovation From Test Conditions1 Parameter NOISE PA98 Min 100kHz BW, RS = 1KΩ, CC = 10pf Typ PA98A Max Min 1 Typ Max Units * µV RMS * dB GAIN OPEN LOOP GAIN @ 15Hz RL = 2KΩ, CC = OPEN 96 111 * GAIN BANDWIDTH PRODUCT RL = 2KΩ, @ 1MHz CC = 3.3pf 100 * MHz POWER BANDWIDTH CC = 10pf 300 * kHz CC = 3.3pf 500 * kHz Full temp range 60 * ° PHASE MARGIN OUTPUT VOLTAGE SWING (Note 4) IO = ±200mA ±VS - 10 ±VS - 6.5 * * V VOLTAGE SWING (Note 4) IO = ±75mA ±VS - 8.5 ±VS - 6.0 * * V VOLTAGE SWING (Note 4) IO = ±20mA ±VS - 8.0 ±VS - 5.5 * * V CURRENT, continuous TC = 85°C SLEW RATE, A V = 20 CC = 10pf ±200 400 * mA * V/µS SLEW RATE, A V = 100 CC = OPEN 1000 * V/µS CAPACITIVE LOAD, A V = +1 Full temp range SETTLING TIME to 0.1% CC = 10pf, 1 * µS RESISTANCE, no load RCL = 0 50 * Ω 700 470 2V step * pF POWER SUPPLY VOLTAGE (Note 6) Full temp range ±15 CURRENT, quiescent ±150 ±225 21 25 * * * V * * mA THERMAL RESISTANCE, AC, Full temp range, junction to case (Note 5) F > 60Hz 2.5 * °C/W RESISTANCE, DC, junction to case Full temp range, 4.2 * °C/W RESISTANCE, junction to air Full temp range F < 60Hz TEMPERATURE RANGE, case Meets full range specifications 30 -25 * +85 * °C/W * °C NOTES: * The specification of PA98A is identical to the specification for PA98 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 0.625 V/°C below 25°C case. No derating needed above 25°C case. PA98U 3 8 CC = 10pF -135 -180 -225 C 5° 12 = AV = 30 PO = 15W CC = 10pF RL = 1KΩ 200 4 120 CC = 10pF 100 80 60 40 20 1K 10K 100K 1M FREQUENCY, F (Hz) 10M POWER SUPPLY REJECTION, PSR (dB) COMMON MODE REJECTION, CMR (dB) 0 15 30 45 60 75 90 EXT. COMPENSATION CAPACITOR, CC (pF) COMMON MODE REJECTION .005 .003 .001 10 100 140 .01 100 1K 10K FREQUENCY, F (Hz) 100K POWER SUPPLY REJECTION 120 100 80 60 40 20 1 10 100 1K 10K 100K 1M FREQUENCY, F (Hz) 200K 500K 2M FREQUENCY, F (Hz) 5M 20 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT 500 140 CURRENT LIMIT, ILIM (mA) 500 DISTORTION, (%) SLEW RATE, (V/µS) .03 RL = 2KΩ INPUT NOISE VOLTAGE HARMONIC DISTORTION .05 50 25 50K 50 100 150 200 250 OUTPUT CURRENT, IO (mA) F 0 125 100 75 .3p 4 250 F SLEW RATE 5 SMALL SIGNAL RESPONSE 0p 10M 20M 500 0 100 200 300 400450 TOTAL SUPPLY VOLTAGE, VS (V) =1 1000 100 1K 10K 100K 1M FREQUENCY, F (Hz) 55°C TC = - .90 CC -20 10 TC 6 C = 25° .95 F 0 7 T C = 25°C 8p CC = 68pF 8 °C 125 TC = -55°C =6 20 1.00 CC CC = 10pF 40 1.05 SMALL SIGNAL RESPONSE 9 TC = =3 80 40M 1.10 CC CC = 3.3pF 10 1M 10M FREQUENCY, F (Hz) C 100 60 -270 .2M 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE CC = 3.3pF T 0 NORMALIZED QUIESCENT CURRENT, IQ (X) 16 CC = 68pF -90 1.15 OUTPUT VOLTAGE, VO (VPP) PHASE, Ф (°) 24 QUIESCENT CURRENT 1.20 -45 32 0 PHASE RESPONSE 0 INPUT NOISE VOLTAGE, VN (nV√Hz) POWER DERATING 40 120 OPEN LOOP GAIN, A (dB) Product Innovation From VOLTAGE DROP FROM SUPPLY, VS - VO (V) OUTPUT STAGE INTERNAL POWER DISSIPATION, P (W) PA98 • PA98A 300 200 100 50 20 1 2 5 10 20 30 RESISTOR VALUE, RCL (Ω) PA98U PA98 • PA98A Product Innovation From TYPICAL APPLICATION DYNAMIC FOCUSING DC FOCUS R IN1 RF +225V Dynamic focusing is the active correction of focusing voltage X SWEEP R CL SAMPLE as a beam traverses the face of a CRT. This is necessary in R IN2 high resolution flat face monitors since the distance between z = x2 + y2 TO cathode and screen varies as the beam moves from the center PA98 FOCUS SWEEP GRID of the screen to the edges. PA98 lends itself well to this func- YSAMPLE tion since it can be connected as a summing amplifier with inputs from the nominal focus potential and the dynamic cor225V rection. 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. PHASE COMPENSATION Gain 1 20 100 CC 68pF 10pF 3.3pF RC 100Ω 330Ω 0Ω CC RATED FOR FULL SUPPLY VOLTAGE 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. 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 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. 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. PA98U 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 SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V) 5 PA98 • PA98A Product Innovation From INPUT PROTECTION Although the PA98 can withstand differential voltages up to ±25V, additional external protection is recommended. Since the PA98 is a high speed amplifier, low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 1). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. POWER SUPPLY PROTECTION 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. +VS Z1 1 –IN Q1 11, 12 Q3 6 PA98 Q2 +IN FIGURE 1. OVERVOLTAGE PROTECTION Q4 2 7, 8 Z2 –VS STABILITY The PA98 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. INTERNAL POWER DISSIPATION AND HEATSINK SELECTION With the unique combination of high voltage and speed of the PA98, traditional formulas for heatsink selection will falsely lower the apparent power handling capability of this amplifier. To more accurately predict operating temperatures use Power Design1 revision 10 or higher, or use the following procedure: Find internal dissipation (PD) resulting from driving the load. Use Power Design or refer to Apex Precision Power Applications Note 1, General Operating Considertaions, paragraph 7. Find total quiescent power (PDQ) by multiplying 0.025A by VSS (total supply voltage). Find output stage quiescent power (PDQOUT) by multiplying 0.001 by VSS. Calculate a heatsink rating which will maintain the case at 85°C or lower. RØSA = TC - TA -0.1°C/W PD + PDQ Where:TC = maximum case temperature allowed TA = maximum ambient temperature encountered Calculate a heatsink rating which will maintain output transistor junctions at 150°C or lower. RØSA = TJ - TA - (PD + PDQOUT) * RØJC -0.1°C/W PD + PDQ Where:TJ = maximum junction temperature allowed. RØJC = AC or DC thermal resistance from the specification table. Use the larger heatsink of these two calculations. Power Design is an Excel spreadsheet available free from www.cirrus.com 6 PA98U Product Innovation From PA98 • PA98A 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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