PA96 PA96 P r o d uPA96 c t IInnnnoovvaa t i o n FFr roomm Power Operational Amplifier FEATURES • HIGH VOLTAGE - 300 VOLTS • HIGH OUTPUT CURRENT – 1.5 AMPS • 70 WATT DISSIPATION CAPABILITY • 175 MHz GAIN BANDWIDTH • 250 V/µ-SECOND SLEW RATE APPLICATIONS • PZT DRIVE • MAGNETIC DEFLECTION • PROGRAMMABLE POWER SUPPLIES • 70V LINE AUDIO to 70W TYPICAL APPLICATION RF RI DESCRIPTION The PA96 is a state of the art high voltage, high current operational amplifier designed to drive resistive, capacitive and inductive loads. For optimum linearity, the output stage is biased for class A/B operation. External compensation provides user flexibility in maximizing bandwidth at any gain setting. The safe operating area (SOA) can be observed for all operating conditions by selection of user programmable current limit. For continuous operation under load, a heatsink of proper rating is required. The hybrid integrated circuit utilizes thick film (cermet) 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 isolation washers voids the warranty. EQUIVALENT CIRCUIT DIAGRAM +Vs 3 8-pin TO-3 PACKAGE STYLE CE +275V + _ - PA96 + -15V CC PZT POSITION CONTROL The MOSFET output stage of the PA96 provides superior SOA performance compared to bipolar output stages where secondary breakdown is a concern. The extended SOA is ideal in applications where the load is highly reactive and may impose simultaneously both high voltage and high current across the output stage transistors. In the figure above a piezo-electric transducer is driven to high currents and high voltages by the PA96. EXTERNAL CONNECTIONS +VS CL 3 2 RCL +IN 4 -IN 5 7 +IN 4 1 OUT TOP VIEW 8 COMP COMP -IN 5 RCL 1 OUT 7 -VS 6 COMP 8 COMP CC 2 CL -Vs 6 PA96U http://www.cirrus.com Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − PA96UREVE PA96 P r o d u c t I n n o v a t i o nF r o m ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to −VS OUTPUT CURRENT, continuous POWER DISSIPATION, internal, DC INPUT VOLTAGE, common mode INPUT VOLTAGE, differential TEMPERATURE, pin solder, 10s TEMPERATURE, junction1 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case 300V 1.5A, 70W +VS to −VS ±15V 300°C 150°C −65 to 150°C −55 to 125°C SPECIFICATIONS PARAMETER TEST CONDITIONS2 INPUT OFFSET VOLTAGE OFFSET VOLTAGE vs. temperature OFFSET VOLTAGE vs. supply BIAS CURRENT, initial BIAS CURRENT vs. supply OFFSET CURRENT, initial INPUT RESISTANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE3 COMMON MODE VOLTAGE RANGE3 COMMON MODE REJECTION, DC NOISE GAIN OPEN LOOP @ 15Hz GAIN BANDWIDTH PRODUCT @ 1MHz PHASE MARGIN PBW OUTPUT VOLTAGE SWING3 VOLTAGE SWING3 VOLTAGE SWING3 VOLTAGE SWING3 CURRENT, continuous, DC SLEW RATE SETTLING TIME, to 0.1% RESISTANCE, open loop THERMAL RESISTANCE, AC Junction to Case4 RESISTANCE, DC Junction to Case RESISTANCE, Junction to Ambient TEMPERATURE RANGE, case POWER SUPPLY VOLTAGE CURRENT, Quiescent total CURRENT, Quiescent output stage only MIN Full temperature range TYP MAX UNITS 1 20 6 5 50 20 200 0.1 50 mV µV/°C µV/V pA pA/V pA GΩ pF V V dB µV RMS 114 175 dB MHz ° KHz 250 V V V V A V/µS 2 7 10 µS Ω 1.2 1.6 30 1.3 1.8 85 °C/W °C/W °C/W °C ±100 30 10 ±150 35 V mA mA 100 4 +VS − 13 −VS + 13 92 100KHz bandwidth, 1kΩ Rs RL= 1kΩ, CC=100pF VS = 150V, -VS = 150V, A = -100, RF = 100K Full temperature range, using recommended CC for gain. 250V p-p output, 100Ω, +150V Supplies, Cc = 0pf IO = 1.5A IO = −1.5A IO = 0.1A IO = −0.1A AV = −100, ±150V Supplies, 250Ω load negative slope, Positiveslope much faster AV = −100, 1V Step, CC = 0pF DC, 1A Load 96 100 60 100 +VS − 12 −VS + 12 +VS − 8 −VS + 8 1.5 200 Full temperature range. f > 60Hz Full temperature range. f < 60Hz Meets full range specifications +VS − 5.6 −VS + 10 -25 ±15 25 NOTES: 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 noted as a test condition. 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. PA96U PA96 P r o d u c t I n n o v a t i o nF r o m OPEN LOOP FREQUENCY RESPONSE OPEN LOOP PHASE RESPONSE 90 120 0 0pF 40 -90 -40 10 100 1K 10K 100K 1M 10M100M FREQUENCY, (Hz) 50 -50 -150 0 5 10 15 TIME, (µsec) 20 +VS = 150V -VS = 150V 6 A = -100 CC = 0 2 -2 -6 -10 25 OUTPUT VOLTAGE SWING 0 5 10 15 TIME, (µsec) 20 9 6 VS - VO 3 1.5 1 .5 0 -.5 -1 -1.5 2.0 QUIESCENT CURRENT vs. POWER SUPPLY QUIESCENT CURRENT, mA 31.0 30.9 30.8 30.7 30.6 30.5 30.4 30.3 30.2 30.1 30.0 30 PA96U -2.5 30 90 150 210 270 POWER SUPPLY RAIL to RAIL INTERNAL POWER DISSIPATION, W 0.4 0.8 1.2 1.6 OUTPUT CURRENT, A 0 0 100 20 40 60 80 100 120 140 160 +VS VOLTAGE LARGE SIGNAL PULSE RESPONSE +VS = 150V -VS = 150V 75 A = -100 CC = 0 25 -25 -75 -120 DC OFFSET vs. POWER SUPPLY -2 0 0.0 40 20 0 5 10 15 TIME, (µsec) 45 40 35 30 25 20 15 10 5 0 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE, °C SOA POWER DERATING 80 70 60 50 40 30 20 10 0 -55 -35 -15 5 25 45 65 85 105 125 CASE TEMPERATURE, °C 25 50 90 150 210 270 POWER SUPPLY, RAIL to RAIL 90 20 QUIESCENT CURRENT vs. TEMP. QUIESCENT CURRENT, mA VO - (-VS) 60 2.5 DC OFFSET RTI, mV VS - VO, (V) 12 80 125 25 2 -VS = -15V 120 100 10 OUTPUT VOLTAGE, VO (V) OUTPUT VOLTAGE, VO (V) +VS = 150V -VS = 150V 150 A = -100 CC = 0 140 SMALL SIGNAL PULSE RESPONSE 250 15 0pF -360 10 100 1K 10K 100K 1M 10M100M FREQUENCY, (Hz) RAIL TO RAIL PULSE RESPONSE -250 22pF 330pF -180 -270 0 330pF -VS = -150V 160 OUTPUT VOLTAGE, VO (V) 330pF 22pF 180 OUTPUT CURRENT FROM +VS or –VS (A) GAIN, db 80 22pF PHASE, Ф (°) 0pF GAIN BANDWIDTH vs. +SUPPLY VOLTAGE 200 GAIN BANDWIDTH PRODUCT @ 1MHz 160 3 2 1 .5 .4 .3 .2 st st st ea ea dy st at e T ea dy T C dy st st e T C = e s T C = 85 = °C 12 10 0m at at = 25 °C 5° C .1 10 20 30 4050 100 200 300 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS –VO (V) 3 PA96 P r o d u c t I n n o v a t i o nF r o m GENERAL COMPENSATION TABLE 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 Application Notes library, Technical Seminar Workbook, and Evaluation Kits. The following table tabulates recommended compensation capacitor values vs. gain. These values will typically result in less than 2% overshoot and a -3db small signal bandwidth of greater than 1MHz, except under operating conditions where uncompensated gain bandwidth is too low to support a 1MHz bandwidth. (See gain bandwidth vs. Plus power supply curves). Note that other factors such as capacitance in parallel with the feedback resistor may reduce circuit bandwidth from that determined from the gain bandwidth curve. SPECIAL PRECAUTIONS The PA96 operates with up 300V rail to rail voltage, and delivers amperes of current. Precautions should be taken for the safety of the user and the amplifier. Although the non-operating common mode input range is rail to rail, the differential input voltage must not exceed ±15 V. Therefore; if the feedback ratio is less than 10, even if caused by disconnecting a signal source , typical power turn on transients can destroy the amplifier. Similarly in a voltage follower application a large differential transient can be generated if the slew rate of the input is greater than that of the voltage follower. Therefore it is prudent to clamp the input with series back to back diodes as shown below. 1N4148 1N4148 1N4148 1N4148 PA96 If experimentally optimizing the compensation capacitor, turn off the supplies and let them bleed to low voltage before installing each new value. Otherwise internal current pulses of up to 3 amps can be induced. Also, do you want your fingers around 300V? Essentially the full rail to rail power supply voltage may be applied to the compensation capacitor. A 400V COG or Mica capacitor is recommended. POWER BANDWIDTH The power bandwidth is 1/(π x the negative edge slew time). The slew time is determined by the compensation capacitor, load, and internal device capacitance; it is independent of closed loop gain. The uncompensated power bandwidth is typically 100kHz for a 250Vp-p output signal into 100Ω. It typically increases to above 300KHz with no load. 4 Cc 150pf 51pf 33pf 22pf 10pf 5pf None Cc 330 pf 150pf 51pf 33pf 22pf 10pf 5pf None Inverting Gain From To 1 2 2 5 5 10 10 20 20 50 50 100 100 up Non-Inverting Gain From To 1 2 2 3 3 6 6 10 10 20 20 50 50 100 100 up CURRENT LIMIT For proper operation the current limit resistor, Rcl, must be connected as shown in the external connections diagram. The minimum value is 0.2Ω, with a maximum practical value of 100Ω. For optimum reliability the resistor should be set as high as possible. The value is calculated as IL = 0.68V/Rcl. Note that the 0.68V is reduced by 2mV every °C rise in temperature. Also note that the current limit can be set such that the SOA is exceeded on a continuous basis. As an example if the current limit was set at 1.5A and the supply was at 150V, a short to ground would produce 225 watts internal dissipation, greatly exceeding the 83 watt steady state SOA rating. Under some conditions of load and compensation the amplifier may oscillate at a low level when current limit is active, even though the amplifier is stable otherwise. The current will be limited to the programmed value in this situation. To minimize such occurrences, use a non-reactive resistor to program current limit. PA96U P r o d u c t I n n o v a t i o nF r o m PA96 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. 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