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P r o d u c t I n n o v a t i o n F r o m PA107DP PA107DPU 1 PA107DP GENERAL DESCRIPTION The PA107DP is a state of the art wideband high pow- er operational amplifier designed to drive resistive, ca- pacitive or inductive loads. For optimum linearity the output stage is biased for class A/B operation. Feed forward technology is used to obtain wide bandwidth and excellent DC performance, but constricts use to inverting mode only. External compensation allows the user to obtain both high gain and wide bandwidth. Use of a heatsink is required to realize the SOA. This hybrid integrated circuit uses thick film resistors, ceramic capacitors, and semiconductors to maximize reliability, minimize size, and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 12 pin SIP package occupies only 2 square inches. The use of compressible insulation washers voids the war- ranty.
FEATURES
♦ High Voltage 180 Vp-p ♦ High Slew Rate 2500 V/µs Minimum with A CL = 20 ♦ High Gain Bandwidth 180 MHz ♦ High Output Current ±1.5 A Steady State Within SOA ♦ High Peak Output Current ±5 A
APPLICATIONS
♦ Piezo Drive ♦ CRT Beam Intensity Control ♦ ATE Applications ♦ Line Driver Power Operational Amplifiers PA107DPP r o d u c t I n n o v a t i o n F r o m VEE GND 4 +VAUX -VAUX +VAUX D S G Q1:2 Q13 Q10 D10 R18 R13 R8 R11 R7 R10 Q22R17 Q18 Q20 Q17 OUT11 +Vsp12 IN 1 D S G Q1:1 R4 D9 R12 Q21 Q16 Q19R16 Q12 Q15 R15 Q14 +VS R19 Q9 R14 Q11 +VAUX -VAUX -VAUX +VAUX +VAUX -VAUX +VS -VS -VS -VSP EQUIVALENT SCHEMATIC Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved)http://www.cirrus.com AUG 2009 APEX − PA107DPUREVA
P r o d u c t I n n o v a t i o n F r o m PA107DP
2 PA107DPU
Parameter Symbol Min Max Units SUPPLY VOLTAGE, +VS to −VS 40 200 V SUPPLY VOLTAGE, −VS -20 -100 V SUPPLY VOLTAGE, -VAUX to +VAUX 20 36 V SUPPLY VOLTAGE, -VAUX -10 -18 V OUTPUT CURRENT, Steady State, (Within SOA) 1.5 A OUTPUT CURRENT, peak, (Within SOA) 5 A POWER DISSIPATION, internal, DC 62.5 W INPUT VOLTAGE -VAUX + 2 +VAUX - 2 V TEMPERATURE, pin solder, 10s 260 °C TEMPERATURE, junction (Note 2) 150 °C TEMPERATURE RANGE, storage -40 +85 °C OPERATING TEMPERATURE, case -25 +85 °C 1. CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Test Conditions Min Typ Max Units VS = 100V, -VS = -100V, VAUX = 15V, -VAUX = -15V INPUT OFFSET VOLTAGE 5 10 mV OFFSET VOLTAGE vs. temperature 10 µV/°C BIAS CURRENT, initial (Note 3) 300 pA INPUT RESISTANCE, DC 13 GΩ INPUT CAPACITANCE 2 pF INPUT VOLTAGE RANGE -VAUX + 2 +VAUX - 2 V NOISE, RTI 1k source, 500 kHz BW, ACL 101 13 nV/√Hz GAIN OPEN LOOP GAIN @ DC 140 dB OPEN LOOP GAIN @ 1MHz 40 dB POWER BANDWIDTH, 170Vp-p Full temperature range 2 MHz OUTPUT VOLTAGE SWING 10MΩ in parallel with 10 pf 187 VP-P VOLTAGE SWING IO = 1.5A ±VS ±10 V CURRENT, peak ±5 A CURRENT, Steady State (within SOA) ±1.5 A SLEW RATE, 25% to 75% 2500 3000 V/µS SETTLING TIME to 0.1% 12 µS SPECIFICATIONS
P r o d u c t I n n o v a t i o n F r o m PA107DP PA107DPU 3 HIGH VOLTAGE SMALL SIGNAL RESPONSE Frequency, (Hz) ±VS = ±100V, ±VAUX = ±15V -40 120 16045 -180 -135 -90 -45 10 100 1K 10K 100K 1M 10M100M Phase, (º) Phase Amplitude Amplitude, (dB) LOW VOLTAGE SMALL SIGNAL RESPONSE -40 120 16045 -180 -135 -90 -45 10 100 1K 10K 100K 1M 10M100M Frequency, (Hz) ±VS = ±20V, ±VAUX = ±10V Phase, (º) Phase Amplitude Amplitude, (dB) Rail to Rail Supply Voltage, VSS (V) ±VAUX = ±15V Normalized Supply Current, IQ (X) 40 2001801601401201008060 1.02 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 HIGH VOLTAGE SUPPLY CURRENT RESPONSE to 500KHz SQUARE WAVE Time, T (µs) A = -22, ±VS = ±100V, ±VAUX = ±15V Amplitude, VO (V) 0 1.61.20.80.4 100 -100 -80 -60 -40 -20 Time, (ns) A = -22, ±V S = ±100V, ±VAUX = ±15V 100 -100 -60 -20 0.0n 20n 40n 60n 80n 100n POSITIVE SLEW Amplitude, (V) Time, (ns) A = -22, ±VS = ±100V, ±VAUX = ±15V 100 -100 -60 -20 0.0n 20n 40n 60n 80n 100n NEGATIVE SLEW Amplitude, (V) Case Temperature, TC (°C) Internal Power Dissipation, PD (W) 0 150125100755025 DC Power AC Power POWER DERATING Case Temperature, TC (°C) Normalized Quiescent Current, IQ(VS) (X) -40 806040200-20 0.9 0.95 1.05 1.1 1.15 HIGH VOLTAGE CURRENT vs. TEMPERATURE Output Frequency, FOUT (KHz) HV Supply Current, IVS (mA) 100 31002600210016001100600 100 150 200 250 300 350 ±VS = ±100V ±VAUX = ±15V 10pF Load VO = 170VP-P Sinewave HIGH VOLTAGE CURRENT vs. FREQUENCY NOTES: 1. All Min/Max characteristics and specifications are guaranteed over the Specified Operating Condi- tions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TC = 25°C. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 3. Doubles for every 10ºC of case temperature increase. 4. +VS and −VS denote the positive and negative supply voltages to the output stages. 5. +VAUX and –VAUX denote the positive and negative supply voltages to the input stages. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 2. TYPICAL PERFORMANCE GRAPHS Parameter Test Conditions Min Typ Max Units POWER SUPPLY VOLTAGE, +VS 20 100 V VOLTAGE, -VS -100 -20 V VOLTAGE, +VAUX 10 15 18 V VOLTAGE, -VAUX -18 -15 -10 V CURRENT, QUIESCENT, +VS 20 30 35 mA CURRENT, QUIESCENT, -VS 20 30 35 mA CURRENT, QUIESCENT, -VAUX 16 19 21 mA CURRENT, QUIESCENT, +VAUX 16 19 21 mA THERMAL RESISTANCE, AC, junction to case (Note 6) 1.5 °C/W RESISTANCE, DC junction to case 2 °C/W RESISTANCE, junction to air 30 °C/W TEMPERATURE RANGE, case -25 85 °C
P r o d u c t I n n o v a t i o n F r o m PA107DP
4 PA107DPU
1 2 3 4 5 6 7 8 9 10 11 12 1uF 1uF +VSP C1-2 = 10uF/A out (peak), electrolytic/tantalum, low frequency bypass. C3-4 = 1uF 25V X7R ceramic capacitor recomended. C5-6 = 1uF 200V X7R ceramic capacitor recomended. 1uF 1uF C1 C2+ IN -VS -VSP OUT+VSOPENOPENOPENGND+VAUX-VAUX EXTERNAL CONNECTIONS 12-pin SIP Package Style DP Formed leads available See Package Style EE HIGH VOLTAGE SMALL SIGNAL RESPONSE Frequency, (Hz) ±VS = ±100V, ±VAUX = ±15V -40 120 16045 -180 -135 -90 -45 10 100 1K 10K 100K 1M 10M100M Phase, (º) Phase Amplitude Amplitude, (dB) LOW VOLTAGE SMALL SIGNAL RESPONSE -40 120 16045 -180 -135 -90 -45 10 100 1K 10K 100K 1M 10M100M Frequency, (Hz) ±VS = ±20V, ±VAUX = ±10V Phase, (º) Phase Amplitude Amplitude, (dB) Rail to Rail Supply Voltage, VSS (V) ±VAUX = ±15V Normalized Supply Current, IQ (X) 40 2001801601401201008060 1.02 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0.98 HIGH VOLTAGE SUPPLY CURRENT RESPONSE to 500KHz SQUARE WAVE Time, T (µs) A = -22, ±VS = ±100V, ±VAUX = ±15V Amplitude, VO (V) 0 1.61.20.80.4 100 -100 -80 -60 -40 -20 Time, (ns) A = -22, ±V S = ±100V, ±VAUX = ±15V 100 -100 -60 -20 0.0n 20n 40n 60n 80n 100n POSITIVE SLEW Amplitude, (V) Time, (ns) A = -22, ±VS = ±100V, ±VAUX = ±15V 100 -100 -60 -20 0.0n 20n 40n 60n 80n 100n NEGATIVE SLEW Amplitude, (V) Case Temperature, TC (°C) Internal Power Dissipation, PD (W) 0 150125100755025 DC Power AC Power POWER DERATING Case Temperature, TC (°C) Normalized Quiescent Current, IQ(VS) (X) -40 806040200-20 0.9 0.95 1.05 1.1 1.15 HIGH VOLTAGE CURRENT vs. TEMPERATURE Output Frequency, FOUT (KHz) HV Supply Current, IVS (mA) 100 31002600210016001100600 100 150 200 250 300 350 ±VS = ±100V ±VAUX = ±15V 10pF Load VO = 170VP-P Sinewave HIGH VOLTAGE CURRENT vs. FREQUENCY
P r o d u c t I n n o v a t i o n F r o m PA107DP PA107DPU 5 PIN DESCRIPTIONS Pin # Pin name Description
1 IN Summing Junction Input for Inverting Operational Amplifier
2 +VAUX +10V to +18V Supply for Input Circuits 3 -VAUX -10V to -18V Supply for Input Circuits
4 GND Ground
5 Open Pin
6 Open Pin
7 Open Pin
8 +VS +20V to +100V Supply for Gain and Gate Driver Circuits 9 -VS -20V to -100V Supply for Gain and Gate Driver Circuits 10 -VSP -20V to -100V Supply for Output Source Follower
11 OUT High Power Output of Amplifier
12 +VSP +20V to +100V Supply for Output Source Follower 3. GENERAL Please read Application Note 1 “General Operating Considerations” which covers stability, power 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, complete Application Notes library, Technical Seminar Workbook and Evaluation Kits. CAUTION In order to achieve the highest speed with limited space short circuit protection and thermal protection were sacri - ficed. Do not short the output. Note that if current limiting at 1.5 A could be used, and the output was shorted, internal dissipation would be 150 W. This would still destroy the amplifier, albeit more slowly. 4. INTERNAL POWER DISSIPATION AND HEATSINK SELECTION With the unique combination of high voltage and speed of the PA107, traditional formulas for heatsink selection will falsely lower the apparent power handling capability of this amplifier. To more accurately predict operating tempera- tures 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 Applications Note 1, General Operating Considerations, paragraph 7. Find total quiescent power (PDQ) by multiplying 0.035 A by VSS (total supply voltage), plus 0.021 times the total V AUX (+VAUX + |-VAUX|). Find output stage quiescent power (PD QOUT) by multiplying 0.001 by VSS. Calculate a heatsink rating which will maintain the case at 85°C or lower. 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. 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 RØSA = -0.1°C/WTC - TA PD + PDQ RØSA = -0.1°C/WTJ - TA - (PD + PDQOUT) • RØJC PD + PDQ
P r o d u c t I n n o v a t i o n F r o m PA107DP
6 PA107DPU
- REACTIVE LOADS The PA107DP is stable at a gain of 20 or above when driving either inductive or capacitive loads. However an induc- tor is essentially a short circuit at DC, therefore there must be enough resistance in series to keep low frequency power within ratings. When driving a 1nF capacitive load with a 180 VP-P square wave, the current peak is 1 A. Driving the same capacitor with a 2.3 MHz sine wave, the power bandwidth frequency, results in 2.6 AP-P. The power dissipated in the amplifier while driving a purely capacitive load is given by the formula: P = 2VPKVS/XC P = 2IPKVS/ Where: VPK = Peak Voltage VS = Supply Voltage XC = Capacitive Reactance Notice that the power increases as V PK increases, such that the maximum internal dissipation occurs when V PK is maximum. The power dissipated in the amplifier while driving 1 nF at 2.3 MHz would be 82.76 W. This would not be a good thing to do! But driving 1 nF at 1 MHz at 180V P-P would result in 36.0 W, which could be within the AC power rating. This formula is optimistic; it is derived for an ideal class B amplifier output stage. 6. FEEDBACK CONSIDERATIONS The output voltage of an unloaded PA107DP can easily go as high as 95 V. All of this voltage can be applied across the feedback resistor, so the minimum value of a ½ W resistor in the feedback is 18050Ω. Practically, 20K is the minimum value for a un-derated ½ W feedback resistor. In order to provide the maximum slew rate, power bandwidth, and useable gain bandwidth; the PA107DP is not designed to be unity gain stable. It is necessary to add external compensation for gains less than 20. Often lower performance op-amps may be stabilized with a capacitor in parallel with the feedback resistor. This is because there is effectively one additional pole affecting the response. In the case of the PA107DP, however there are multiple poles clustered near 30 MHz, therefore this approach does not work. A method of compensation that works is to choose a feedback capacitor such that the time constant of the feedback capacitor times the feedback resistor is greater than 33 n-seconds. Also install a capacitor from pin 1 to ground, the summing junction, greater than 20 times as large as the feedback capacitor. The feedback capacitor or summing junction capacitor without the other will degrade stability and often cause oscillation. With the compensation described the closed loop bandwidth will be the reciprocal of 2τFB. Alternatively, at the expense of noise and offset, the amplifier can be stabilized by a resistor across the summing junction such that the parallel combination of the input resistor and summing junction resistor is less than a twentieth of the value of the feedback resistor. Note that this will increase noise and offset by to 20 times the RTI values, but with 10 mV max offset and 13 nV/(Hz)1/2 noise, performance will be acceptable for many applications. As seen by the very small values of capacitance used in compensation for low gain, stray feedback capacitance and/or summing junction capacitance can have a VERY large effect on performance. Therefore stray capacitance must be minimized in the layout. The summing junction lead must be as short as possible, and ground plane must be kept away from the summing junction lead. 7. SLEW RATE AND FULL POWER BANDWIDTH In the PA107DP the slew rate is measured from the 25% point to the 75% point of a 180VP-P square wave. Slew rate is measured with no load and with auxiliary supplies at a nominal ±15 V and VS supplies at a maximum ±100V. Power bandwidth is defined as the highest frequency at which an unloaded amplifier can have an undistorted sine wave at full power as its output. This frequency can be calculated as the slew rate divided by times the peak to peak amplitude; which would be 4.7 MHz for the PA107DP. Unfortunately running full output at this frequency causes internal dissipation of up to 107 W, well over the power limits for the PA107DP. Cutting the frequency to 2 MHz reduces internal dissipation to 34 W, acceptable with a good heatsink.
P r o d u c t I n n o v a t i o n F r o m PA107DP PA107DPU 7 TYPICAL APPLICATION 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 apex.support@cirrus.com. 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. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con- sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP - ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD - UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS- TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. 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. +VSP Piezo Drive DAC +15V+VS -15V-VS GND IN OUT -VAUX -VSP +VAUX +VS -VS RIN PA107 RF