PA08PA08 • PA08A • PA08A PPA08, r o d u c t IPA08A Innnnoovvaa t i o n F Fr ro omm Power Operational Amplifier FEATURES • WIDE SUPPLY RANGE — ±15V to ±150V • PROGRAMMABLE OUTPUT CURRENT LIMIT • HIGH OUTPUT CURRENT — Up to ±150mA • LOW BIAS CURRENT — FET Input APPLICATIONS • HIGH VOLTAGE INSTRUMENTATION • ELECTROSTATIC TRANSDUCERS & DEFLECTION • PROGRAMMABLE POWER SUPPLIES UP TO 290V • ANALOG SIMULATORS 8-pin TO-3 PACKAGE STYLE CE TYPICAL APPLICATION +132V DESCRIPTION 110KΩ The PA08 is a high voltage operational amplifier designed for output voltage swings of up to ±145V with a dual (±) supply or 290V with a single supply. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a zener diode fed by a FET constant current source. As a result, the PA08 features an unprecedented supply range and excellent supply rejection. The output stage is biased-on for linear operation. Internal phase compensation assures stability at all gain settings. The safe operating area (SOA) can be observed with all types of loads by choosing the appropriate current limiting resistors. For operation into inductive loads, two external flyback pulse protection diodes are recommended. A heatsink may be necessary to maintain the proper case temperature under normal operating conditions. This hybrid integrated circuit utilizes beryllia (BeO) substrate, thick film resistors, ceramic capacitors and 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 thermal isolation washers and/or improper mounting torque will void the product warranty. Please see “General Operating Considerations”. The PA08 as a pin driver is capable of supplying high test voltages to a device under test (DUT). Due to the possibility of short circuits to any terminal of the DUT, current limit must be set to be safe when limiting with a supply to output voltage differential equal to the amplifier supply plus the largest magnitude voltage applied to any other pin of the DUT. In addition, flyback diodes are recommended when the output of the amplifier exits any equipment enclosure to prevent damage due to electrostatic discharges. Refer to Application Note 7 for details on accuracy considerations of this circuit. EQUIVALENT SCHEMATIC EXTERNAL CONNECTIONS +132V DAC ±1mA 8.2Ω Q1 Q2 ATE PIN DRIVER C3 Q5 RT Q3 Q4 5 4 Q11 –IN OUTPUT 4 Q12B Q17 5 –VS Q19 8 Q12A OUT 1 8 CL– RS 1 Q10 2 TOP VIEW Q7 C2 C4 +IN R CL+ CL+ Q6 2 Q9 Q8 -VS -132V 3 C1 D.U.T. -132V +VS D1 8.2Ω PA08 3 7 +VS 6 7 BAL R CL– RS = ( +VS + -VS ) RT /1.6 NOTE: Input offset voltage trim optional. RT = 10KΩ MAX Q16 Q15 D2 6 PA08U http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − PA08UREVM PA08 • PA08A ABSOLUTE MAXIMUM RATINGS 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, within SOA POWER DISSIPATION, internal at TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction1 TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS PARAMETER TEST CONDITIONS 2 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 TC = 25°C TC = –25°C to +85°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = 25°C TC = –25°C to +85°C TC = –25°C to +85°C, VCM = ±90V GAIN OPEN LOOP GAIN at 10Hz OPEN LOOP GAIN at 10Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN TC = 25°C, RL = ∞ TC = 25°C, RL = 1.2KΩ TC = 25°C, RL = 1.2KΩ TC = 25°C, RL = 1.2KΩ TC = –25 to +85°C OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, peak SLEW RATE CAPACITIVE LOAD, AV = 1 CAPACITIVE LOAD, AV > 4 SETTLING TIME to .1% TC = 25°C, IO = 150mA TC = –25o C to +85oC, IO = ±75mA TC = –25o C to +85oC, IO = ±20mA TC = 85°C TC = 25°C TC = –25 to +85°C TC = –25 to +85°C TC = 25°C, RL= 1.2KΩ, 2V step POWER SUPPLY VOLTAGE CURRENT, quiescent TC = –55 to +125°C TC = 25°C THERMAL RESISTANCE, AC junction to case5 RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case TC = –55 to +125°C, F > 60Hz TC = –55 to +125°C, F < 60Hz TC = –55 to +125°C Meets full range specification MIN ±VS–10 96 PA08 TYP PA08A MAX MIN TYP ±.5 ±15 ±.5 ±75 5 .01 ±2.5 105 4 ±2 ±.25 ±.5 ±30 ±5 ±10 * 2 * 50 3 10 * ±50 ±1.5 ±10 * * * * 130 118 111 5 90 60 –25 UNITS mV µV/°C µV/V µV/√kh pA pA/V pA MΩ pF V dB dB dB MHz kHz ° * * * * * * * 20 * 10 * SOA * * V V V mA V/µs nF ±100 6 ±150 * 8.5 V mA 4.26 6.22 30 * 8.57 * * * 85 * * 1 * MAX * * * * * ±VS–15 ±VS–8 ±VS–10 ±VS–5 ±VS–5 ±VS–3 150 30 ±15 300V 200mA 17.5W ±50V ±VS 300°C 175°C –65 to +150°C –55 to +125°C * * * * µs °C/W °C/W °C/W °C NOTES: * The specification of PA08A is identical to the specification for PA08 in applicable column to the left. 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 2. The power supply voltage specified under typical (TYP) applies unless otherwise noted. 3. Doubles for every 10oC of temperature increase. 4. +VS and –VS denote the positive and negative supply rail respectively. 5. Rating applies only if output current alternates between both output transistors at a rate faster than 60Hz. CAUTION 2 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. PA08U PA08 • PA08A 10 7.5 5 25 50 75 100 125 TEMPERATURE, T (°C) RCL = 10Ω 50 RL =1.2KΩ PHASE, Ф (°) –90 –120 –150 –180 0 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) PULSE RESPONSE 6 2 0 –2 –4 VIN = ±5V, tr = 100ns –6 0 1 1.5 2.0 .5 TIME, t (µs) 120 100 80 60 40 20 PA08U 10 100 1K 10K .1M FREQUENCY, F (Hz) 10 1M TC = -2 5°C 0 –2 –4 –6 300 100 150 200 250 30 50 TOTAL SUPPLY VOLTAGE, VS (V) RL =1.2KΩ 1.2 1.0 .8 .6 120 100 80 +VS 60 40 –VS 20 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 60 |+VS| + |–VS| = 100V 30 15 50K POWER SUPPLY REJECTION 140 |+VS| + |–VS| = 300V 100 SLEW RATE 1.4 0 T = C = -25 C °C 85° C 2 200 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) .4 100 150 200 250 300 30 50 TOTAL SUPPLY VOLTAGE, VS (V) 2.5 COMMON MODE REJECTION 1 0 1.6 4 140 –210 NORMALIZED SLEW RATE (X) OPEN LOOP GAIN, AOL (dB) 20 T POWER RESPONSE –60 40 RL =1.2KΩ 4 300 –30 60 0 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) OPEN LOOP GAIN 6 PHASE RESPONSE 0 80 -20 OUTPUT VOLTAGE, VO (V) 0 -55 150 RL =1.2KΩ 100 COMMON MODE REJECTION CMR (dB) 100 SMALL SIGNAL RESPONSE 120 RCL = 4.7Ω 150 2.5 0 RELATIVE OPEN LOOP GAIN, A (dB) 12.5 200 OUTPUT VOLTAGE, VO (VP-P) 15 INPUT NOISE VOLTAGE, VN (nV/√Hz) CURRENT LIMIT, ILIM (mA) 17.5 0 CURRENT LIMIT 250 COMMON MODE VOLTAGE, VCM (VP-P) POWER DERATING 20 POWER SUPPLY REJECTION, PSR (dB) INTERNAL POWER DISSIPATION, PD (W) P r o d u c t I n n o v a t i o nF r o m .2M .3M .5M .7M 1M .1M FREQUENCY, F (Hz) INPUT NOISE 20 15 10 6 4 2 10 300 100 10K 1K FREQUENCY, F (Hz) .1M COMMON MODE VOLTAGE |+VS| + |–VS| = 300V 200 100 60 30 |+VS| + |–VS| = 100V 15 10K 20K 50K .1M .2M .5M FREQUENCY, F (Hz) 1M 3 PA08 • PA08A P r o d u c t I n n o v a t i o nF r o m 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 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. SAFE OPERATING AREA (SOA) OUTPUT CURRENT FROM +VS OR –VS (mA) 200 t= 150 t= 100 80 t= ste ad 50 40 1m t= s 5m 20 0s 0.5 ms s ys tat e ±VS SHORT TO ±VSC, C, L, OR EMF LOAD SHORT TO COMMON 150V 125V 100V 75V 50V 20mA 27mA 42mA 67mA 130mA 67mA 90mA 130mA 200mA 200mA These simplified limits may be exceeded with further analysis using the operating conditions for a specific application. 3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. INDUCTIVE LOADS Two external diodes as shown in Figure 1, are required to protect these amplifiers from flyback (kickback) pulses exceeding the supply voltages of the amplifier when driving inductive loads. For component selection, these external diodes must be very quick, such as ultra fast recovery diodes with no more than 200 nanoseconds of reverse recovery time. The diode will turn on to divert the flyback energy into the supply rails thus protecting the output transistors from destruction due to reverse bias. Fig. 1 30 IN4936 OR UES1106 20 80 100 120 150 170 250 300 200 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V) The output stage of most power amplifiers has two distinct limitations: 1. The current handling capability of the transistor geometry and the wire bonds. 2. The second breakdown effect which occurs whenever the simultaneous collector current and collector-emitter voltage exceeds specified limits. The SOA curves combine the effect of these limits. For a given application, the direction and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. However, the following guidelines may save extensive analytical efforts. 1. Under transient conditions, the following capacitive and inductive loads are safe with the current limits set to the maximum: ±VS C(MAX) L(MAX) 150V 125V 100V 75V 50V .4µF .9µF 2µF 10µF 100µF 280mH 380mH 500mH 1200mH 13H 2. The amplifier can handle any EMF generating or reactive load and short circuits to the supply rails or simple shorts to common if the current limits are set as follows: 4 100pf/200V Fig. 2 +VS +IN 150KΩ Q1 Q3 Q2 –IN –VS _ Q4 150KΩ + 100pf/200V PROTECTION, INDUCTIVE LOAD PROTECTION, OVERVOLTAGE A note of caution about the supply. The energy of the flyback pulse must be absorbed by the power supply. As a result, a transient will be superimposed on the supply voltage, the magnitude of the transient being a function of its transient impedance and current sinking capability. If the supply voltage plus transient exceeds the maximum supply rating or if the AC impedance of the supply is unknown, it is best to clamp the output and the supply with a zener diode to absorb the transient. INPUT PROTECTION The input is protected against common mode voltages up to the supply rails and differential voltages up to ±50V. Increased protection against differential input voltages can be obtained by adding 2 resistors, 2 capacitors and 4 diode connected FETs as shown in Figure 2. CURRENT LIMITING Proper operation requires the use of two current limit resistors, connected as shown in the external connection diagram. The minimum value for RCL is 3.24Ω. However, for optimum reliability it should be set as high as possible. Refer to the “General Operating Considerations” section of the handbook for current limit adjust details. PA08U P r o d u c t I n n o v a t i o nF r o m PA08 • PA08A 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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IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. PA08U 5