PA09PA09 • PA09A • PA09A P r o d u c t IPA09A Innnnoovvaa t i o n FFr roomm PA09, Power Operational Amplifier FEATURES • POWER MOS TECHNOLOGY — 2A peak rating • HIGH GAIN BANDWIDTH PRODUCT — 150MHz • VERY FAST SLEW RATE — 200V/µs • PROTECTED OUTPUT STAGE — Thermal shutoff • EXCELLENT LINEARITY — Class A/B output • WIDE SUPPLY RANGE — ±12V to ±40V • LOW BIAS CURRENT, LOW NOISE — FET input APPLICATIONS • VIDEO DISTRIBUTION AND AND AMPLIFICATION • HIGH SPEED DEFLECTION CIRCUITS • POWER TRANSDUCERS TO 2MHz • COAXIAL LINE DRIVERS • POWER LED OR LASER DIODE EXCITATION DESCRIPTION The PA09 is a high voltage, high output current operational amplifier optimized to drive a variety of loads from DC through the video frequency range. Excellent input accuracy is achieved with a dual monolithic FET input transistor which is cascoded by two high voltage transistors to provide outstanding common mode characteristics. All internal current and voltage levels are referenced to a zener diode biased on by a current source. As a result, the PA09 exhibits superior DC and AC stability over a wide supply and temperature range. High speed and freedom from second breakdown is assured by a complementary Power MOS output stage. For optimum linearity, especially at low levels, the Power MOS transistors are biased in the class A/B mode. Thermal shutoff provides full protection against overheating and limits the heatsink requirements to dissipate the internal power losses under normal operating conditions. A built-in current limit protects the amplifier against overloading.Transient inductive load kickback protection is provided by two internal clamping diodes. External phase compensation allows the user maximum flexibility in obtaining the optimum slew rate and gain bandwidth product at all gain settings. For continuous operation under load, a heatsink of proper rating is recommended. This hybrid integrated 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 CE, 8-pin TO-3 package is hermeti+37V di = 2A/µs CC 5pF cally sealed and elecdt 3 trically isolated. The 7 4 i = Vi /RS 8 use of com-pressible VI 1 thermal washers and/ PA09 5 CF LY or improper mount470pF 13µH ing torque will void 6 RD 1Ω the product warranty. –37V RF 3.9K Please see “General Operating Consider100Ω R S ations”. .5Ω FIGURE 1. PA09 AS DEFLECTION AMPLIFIER PA09U http://www.cirrus.com 8-pin TO-3 PACKAGE STYLE CE DEFLECTION AMPLIFIER (Figure 1) The deflection amplifier circuit of Figure 1 achieves arbitrary beam positioning for a fast heads-up display. Maximum transition times are 4µs while delivering 2A pk currents to the 13mH coil. The key to this circuit is the sense resistor (RS) which converts yoke current to voltage for op amp feedback. This negative feedback forces the coil current to stay exactly proportional to the control voltage. The network consisting of RD, RF and CF serves to shift from a current feedback via RS to a direct voltage feedback at high frequencies. This removes the extra phase shift caused by the inductor thus preventing oscillation. See Application Note 5 for details of this and other precision magnetic deflection circuits. EQUIVALENT SCHEMATIC 2 3 D1 C1 Q5 Q3 Q2 Q1 Q4 7 Q6 8 Q7 Q13 Q8 Q12A 5 Q9 Q11 Q12B C2 1 Q14 Q17 Q10 Q19 D3 4 Q15 Q16 D2 Q18 6 EXTERNAL CONNECTIONS +VS 3 RT BAL 2 1 +IN RS OUT 4 TOP VIEW 5 –IN –VS 8 6 7 CC RC CC RS = (|+VS| + |–VS|) RT /1.6 NOTE: Input offset voltage trim optional. RT = 10KΩ MAX Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − PA09UREVM PA09 • PA09A 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, internal1 Input voltage, differential Input voltage, common mode Temperature, pin solder - 10s Temperature, junction1 Temperature range, storage Operating temperature range, case SPECIFICATIONS PA09 TYP PARAMETER TEST CONDITIONS 2 INPUT Offset voltage, initial Offset voltage, vs. temperature Offset voltage, vs. supply Bias current, initial Bias current, vs. supply Offset current, initial Input impedance, dc Input capacitance Common mode voltage range3 Common mode rejection, dc .5 10 10 5 .01 2.5 1011 6 Full temperature range ± VS–10 ± VS–8 Full temperature range, VCM = ± 20V 104 GAIN Open loop gain at 15Hz Gain bandwidth product at 1MHz Power bandwidth Power bandwidth RL = 1kΩ CC = 5pF RL = 15Ω, CC = 5pF RL = 15Ω, CC = 100pF OUTPUT Voltage swing3 Current, peak Settling time to 1% Settling time to .1% Slew rate Slew rate RESISTANCE POWER SUPPLY Voltage Current, quiescent THERMAL Resistance, AC junction to case4 Resistance, DC junction to case Resistance, junction to air Temperature range, case MIN Full temperature range Full temperature range, IO = 2A 4V step, CC = 100pF 4V step, CC = 100pF CC = 5pF CC = 100pF Full temperature range Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications 80 98 150 750 150 ± VS –8 ± VS –7 4.5 .75 1.3 220 25 7.5 ± 12 –25 80V 5A 78W 40V ±VS 300°C 150°C –65 to +150°C –55 to +125°C PA09A MAX MIN TYP ± 3 30 100 50 * MAX UNITS ± .25 ± .5 mV 5 10 µV/°C * µV/V 3 20 pA * pA/V 1.5 10 pA * Ω * pF *V * dB * * * * * *V * A * µs * µs *V/µs *V/µs * Ω ± 35 70 ± 40 * 85 * * 1.2 1.6 30 25 1.3 1.8 + 85 * * * * * * * * dB MHz KHz KHz *V * mA °C/W °C/W °C/W °C NOTES: * The specification of PA09A is identical to the specification for PA09 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. Unless otherwise noted: TC = 25°C, supply voltage = ±35V. 3. +VS and -VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS. 4. Rating applies if the 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. PA09U PA09 • PA09A P r o d u c t I n n o v a t i o nF r o m 40 30 20 10 0 0 15pF 60 33pF 40 100pF 20 330pF 0 -20 10 3 2 OUTPUT VOLTAGE SWING 8 7 6 5 4 3 0 2 3 4 1 OUTPUT CURRENT, IO (A) PHASE RESPONSE 0 100 HIGH 30 10 LOW 3 120 COMMON MODE REJECTION 100 80 60 40 20 1K PA09U 1M 10M 100M 10K 100K FREQUENCY, F (Hz) 15pF -40 33pF -80 ALL OTHERS 100pF -120 330pF -160 330pF -200 10 1 100 300 3 10 1K 30 COMPENSATION CAPACITOR, CC (pF) POWER SUPPLY REJECTION, PSR (dB) 1 GAIN OPEN LOOP PHASE, Ф (°) V/µs 100 1.2 1.0 .8 .6 40 50 70 30 60 80 TOTAL SUPPLY VOLTAGE, VS (V) 100 1K 10K 100K 1M 10M 100M FREQUENCY, F (Hz) 80 60 40 20 0 1K 10M 100M 10K 100K 1M FREQUENCY, F(Hz) 30 20 6.2pF 15pF 33pF 100pF 330pF 30 1K 100 300 3K FREQUENCY, F (KHz) 1M INPUT NOISE 30 20 15 10 7 5 3 10 POWER SUPPLY REJECTION POWER RESPONSE 40 10 10 5 5pF 300 1.4 100 90 80 70 60 50 9 1K 10K 100K 1M 10M 100M FREQUENCY, F (Hz) SLEW RATE vs. COMP. 1000 GAIN AND SLEW RATE, (V/µs) 100 4 10 VOLTAGE DROP FROM SUPPLY (V) OPEN LOOP GAIN, A (dB) 5pF 80 5 1 25 50 75 100 125 –55 –25 0 JUNCTION TEMPERATURE, TJ (°C) 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) 100 6 QUIESCENT CURRENT 1.6 OUTPUT VOLTAGE, VO (VPP) 50 7 NORMALIZED QUIESCENT CURRENT, IQ (X) CURRENT LIMIT, ILIM (A) 60 INPUT NOISE VOLTAGE, VN (nV/√Hz) INTERNAL POWER DISSIPATION, P (W) 8 70 SMALL SIGNAL RESPONSE COMMON MODE REJECTION, CMR (dB) CURRENT LIMIT 9 COMMON MODE VOLTAGE, VCM (VPP) POWER DERATING 80 70 100 10K 100K 1K FREQUENCY, F (Hz) 1M COMMON MODE VOLTAGE 50 | +VS | + | –VS | = 80V 40 30 20 15 CC= 100pF 10 7 100K 300K 1M 3M 10M 30M FREQUENCY, F (Hz) 3 PA09 • PA09A 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; heat sink selection; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. SUPPLY VOLTAGE The specified voltage (±VS) applies for a dual (±) supply having equal voltages. A nonsymmetrical (ie. +70/–10V) or a single supply (ie. 80V) may be used as long as the total voltage between the +VS and –VS rails does not exceed the sum of the voltages of the specified dual supply. 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. OUTPUT CURRENT FROM +VS OR –VS (A) SOA 5.0 TC = 25°C 4.0 t= 3.5 t= 3.0 1.5 0m s 30 0m 2.5 2.0 10 s st ea dy st at e 50 60 70 80 20 25 30 35 40 15 INTERNAL VOLTAGE DROP SUPPLY TO OUTPUT VS –VO (V) SAFE OPERATING AREA CURVES The SOA curves combine the effect of these limits and allow for internal thermal delays. 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. The following guidelines may save extensive analytical efforts: 1. Capacitive and inductive loads up to the following maximums are safe: CAPACITIVE LOAD INDUCTIVE LOAD ±VS 40V .1µF 11mH 30V 500µF 24mH 20V 2500µF 75mH 15V ∞ 100mH 4 2. Short circuits to ground are safe with dual supplies up to ±20V. 3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. BYPASSING OF SUPPLIES Each supply rail must be bypassed to common with a tantalum capacitor of at least 47µF in parallel with a .47µF ceramic capacitor directly connected from the power supply pins to the ground plane. OUTPUT LEADS Keep the output leads as short as possible. In the video frequency range, even a few inches of wire have significant inductance, raising the interconnection impedance and limiting the output current slew rate. Furthermore, the skin effect increases the resistance of heavy wires at high frequencies. Multistrand Litz Wire is recommended to carry large video currents with low losses. GROUNDING Single point grounding of the input resistors and the input signal to a common ground plane will prevent undesired current feedback, which can cause large errors and/or instabilities. "Single point" is a key phrase here; a ground plane should be used as shielding rather than a current path. Leaving the case of the PA09 floating will cause oscillations in some applications. COMPENSATION The PA09 is extremely flexible in terms of choice of compensation capacitor for any given gain. The most common ranges are shown in the COMPENSATION typical performance graph. Swinging closer to the supply rails, heavier loads, faster input signal rise and fall times and higher supply voltages all tend to demand larger values of compensation capacitor. This capacitor must be rated at least as high as the total voltage applied to the amplifier. In making specific value choices, use the square wave stability test presented in APPLICATION NOTE 19, Figures 40 and 41. In addition to small signal testing, if the application includes step functions in the input signal, use this circuit to measure large signal response. By increasing square wave amplitude to the maximum of the application, this test may show significant distortion of the output waveform following the square wave transitions. In this case the faster input stages of the PA09 are out-running the output stage and overload recovery time creates the distortion. This speed relationship is also why slew rate does not increase for compensation values below about 27pF. SUPPLY CURRENT When swinging large signals, the output stage of the PA09 demands extra supply current. The following graphs illustrate this current for several conditions for both sine and square wave signals. Current is exclusive of any load current and will affect both supply rating and thermal ratings. When calculating internal power dissipation, multiply this current times total supply voltage. Note that swinging closer to the supply rail demands more PA09U PA09 • PA09A P r o d u c t I n n o v a t i o nF r o m current. Output voltage is given as peak. Currents are average responding supply readings, but AC monitoring will reveal current pulses corresponding to periods of high slew rate. For QUIESCENT vs. SINE DRIVE 1.4 /23 V S STABILITY O /4 0V S 1.2 15V O /40 V S 1.3 32 V NORMALIZED IQ, (X) 1.5 15 V O 1.1 1.0 100 300 FREQUENCY, F (KHz) 1000 QUIESCENT vs. SQUARE DRIVE NORMALIZED IQ, (X) 7.0 32VO /40VS 15VO /23VS 4.0 15VO /40VS 2.5 100K FREQUENCY, F (KHz) Due to its large bandwidth the PA09 is more likely to oscillate than lower bandwidth Power Operational Amplifiers. To prevent oscillations a reasonable phase margin must be maintained by: 1. Pay very careful attention to supply bypassing and circuit grounding. This is very important when step functions are driven and the PA09 shares supplies with more active devices. 2. Keeping the external sumpoint stray capacitance to ground at a minimum and the sumpoint load resistance (input and feedback resistors in parallel) below 500Ω. Larger sumpoint load resistances can be used with increased phase compensation and/or bypassing of the feedback resistor. 3. Connect the case to a local AC ground potential. CURRENT LIMIT 5.5 1.0 10K does not protect the amplifier against transient SOA violations (areas outside of the TC = 25°C boundary). It is designed to protect against short-term fault conditions that result in high power dissipation within the amplifier, If the conditions that cause thermal shutdown are not removed, the amplifier will oscillate in and out of shutdown. This will result in high peak power stresses, destroy signal integrity, and reduce the reliability of the device. 1M Internal current limiting is provided in the PA09. Note the current limit curve given under typical performance graphs is based on junction temperature. If the amplifier is operated at cold junction temperatures, current limit could be as high as 8 amps. This is above the maximum allowed current on the SOA curve of 5 amps. Systems using this part must be designed to keep the maximum output current to less than 5 amps under all conditions. The internal current limit only provides this protection for junction temperatures of 80°C and above. example, driving ±30V outputs at 500KHz on ±40V supplies produces a .8A pulse during negative slew and a 1.2A pulse during positive slew. If the input signal is over driven by several times the output swing capability, pulses up to 4A may be seen. THERMAL SHUTDOWN PROTECTION The thermal protection circuit shuts off the amplifier when the substrate temperature exceeds approximately 150°C. This allows heatsink selection to be based on normal operating conditions while protecting the amplifier against excessive junction temperature during temporary fault conditions. Thermal protection is a fairly slow-acting circuit and therefore PA09U 5 PA09 • PA09A P r o d u c t I n n o v a t i o nF r o m 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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