PA15FLA

PA15FL • PA15FLA High Voltage Power Operational Amplifiers RoHS COMPLIANT FEATURES • • • • • High Voltage — 450V (±225V) Low Cost Low Quiescent Current — 3mA max High Output Current — 200mA Programmable Current Limit APPLICATIONS • • • • Piezoelectric Positioning High Voltage Instrumentation Electrostatic Transducers Programmable Power Supplies Up To 440V DESCRIPTION The PA15FL is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 200mA and pulse currents up to 350mA into capacitive loads. The safe operating area (SOA) has no second breakdown limitations and can be observed for all type loads by choosing an appropriate current limiting resistor. The MOSFET input stage has integrated static and differential mode protection. The MOSFET output stage is biased AB for linear operation. External compensa‐ tion provides flexibility in choosing bandwidth and slew rate for the application. The 10‐pin power SIP pack‐ age is electrically isolated. EQUIVALENT SCHEMATIC Figure 1: Equivalent Schematic 6 +VS R1 R2 Q1 C1 Q3 Q2 Q6 9 CC1 Q5 1 –IN 8 CC2 Q8 R7 R9 Q12 Q13 R10 Q15 R11 Q4 ICL 7 10 OUT R6 R5 2 +IN www.apexanalog.com R4 Q11 R8 –VS 5 R3 Q14 Q16 R12 © Apex Microtechnology Inc. All rights reserved Oct 2018 PA15FLU Rev L PA15FL • PA15FLA TYPICAL CONNECTION Figure 2: Typical Connection RF +V S 100nF * CC RIN RC +V S CC + PA15 V OUT RC CL OUT RCL -V S -V S RL 100nF * * Use 10μF per Amp of Output Current PINOUT AND DESCRIPTION TABLE Figure 3: External Connections Pin Number 2 Name Description 1 ‐IN The inverting input. 2 +IN The non‐inverting input. 3, 4 NC No connection. 5 ‐VS The negative supply rail. 6 +VS The positive supply rail. 7 CL Connect to the current limit resistor. Output current flows into/out of this pin through RCL. The output pin and the load are connected to the other side of RCL. 8 RC Compensation resistor connection. Select value based on Phase Compensation. See applicable section. 9 CC Compensation capacitor connection. Select value based on Phase Compensation. See applicable section. 10 OUT The output. Connect this pin to load and to the feedback resistors. PA15FLU Rev L PA15FL • PA15FLA SPECIFICATIONS Unless otherwise noted: TC = 25°C, compensation = CC = 33pF, RC = 1 kΩ, RCL = 0. DC input specifications are ± value given. Power supply voltage is typical rating. ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min +VS to ‐VS Supply Voltage, total IOUT Output Current, source, sink Power Dissipation, internal @ Tc = 25°C Input Voltage, differential Input Voltage, common mode PD 450 V mA 30 W VIN (Diff) ‐25 25 V VCM ‐VS VS V 260 °C 150 °C ‐55 125 °C ‐40 85 °C TJ Temperature Range, storage TC Operating Temperature Range, case Units SEE SOA Temperature, pin solder, ‐10s max. Temperature, junction 1 Max 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dis‐ sipation to achieve high MTTF. The PA15FL is constructed from MOSFET transistors. ESD handling procedures must be observed. CAUTION The substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. INPUT Parameter Test Conditions PA15FL Min PA15FLA Max 10 0.5 3 mV 15 50 5 20 µV/°C Offset Voltage vs. supply 10 50 * * µV/V Offset Voltage vs. time 75 Bias Current, initial 200 Offset Voltage vs. temperature Full temp range Max 2 Min Units Typ Offset Voltage, initial Typ * 2000 * µV/√kh * Bias Current vs. supply 4 Offset Current, initial 50 Input Impedance, DC 1011 * Ω 4 * pF Input Capacitance Common Mode Voltage Range 1 * pA 500 ±VS–15 Common Mode Rejection, DC VCM = ±90V Noise 10 kHz BW, RS= 1 kΩ, CC = open 80 30 * 98 2 * pA/V 200 pA V * dB * µVrms 1. +VS and –VS denote the positive and negative power supply rail respectively. PA15FLU Rev L 3 PA15FL • PA15FLA GAIN Parameter Test Conditions PA15FL Min Typ 94 111 PA15FLA Max Max Units Min Typ * * dB Open Loop, @ 15 Hz RL = 2 kΩ, CC = OPEN Gain Bandwidth Product @ 1 MHz RL = 2 kΩ, CC = OPEN 5.8 * MHz Power Bandwidth RL = 2 kΩ, CC = OPEN 24 * kHz Phase Margin Full temp range 60 * ° Test Conditions PA15FL PA15FLA OUTPUT Parameter Voltage Swing 1 IOUT = ±200mA Current, continuous Slew Rate, AV = 100 CC = OPEN Capacitive Load, AV = +1 Full temp range Settling Time to 0.1% CC = OPEN, 2V step Min Typ Max ±VS–15 ±VS–10 ±200 Typ * * Max mA 20 100 Units V * 20 Resistance, no load Min 30 V/µs * pF 2 * µs 50 * Ω 1. +VS and –VS denote the positive and negative power supply rail respectively. POWER SUPPLY Parameter Voltage 1 Current, quiescent Test Conditions PA15FL PA15FLA Units Min Typ Max Min Typ Max ±50 ±150 ±225 * * * V 2.0 3.0 * * mA 1. Derate max supply rating 0.625 V/°C below 25°C case. No derating needed above 25°C case. 4 PA15FLU Rev L PA15FL • PA15FLA THERMAL Parameter Test Conditions PA15FL Min Typ PA15FLA Max Min Typ Max Units Resistance, AC junction to case 1 Full temp range, f > 60 Hz 2.5 * °C/W Resistance, DC junction to case Full temp range, f < 60 Hz 4.2 * °C/W Resistance, junction to air Full temp range Temperature Range, case Meets full range specifications 30 ‐25 * 85 * °C/W * °C 1. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. Note: *The specification of PA15FLA is identical to the specification for PA15FL in applicable column to the left. PA15FLU Rev L 5 PA15FL • PA15FLA TYPICAL PERFORMANCE GRAPHS Figure 4: Power Derating Figure 5: Quiescent Current 2.8 Quiescent Current, IQ (mA) /ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;tͿ 40 32 24 16 8 0 0 25 50 75 100 125 TC = 125°C 2.6 2.4 2.2 2.0 100 150 Case Temperature, TC (°C) TC = -55°C 200 300 400 450 Total Supply Voltage, VS (V) Figure 6: Power Response Figure 7: Small Signal Response 50 500 n pe =O CC F 5p =1 CC 100 F 3p Open Loop Gain, A (dB) 40 =3 CC Output Votlage, VOUT (VP-P) TC = 25°C TC = 85°C 30 CC = Open 20 10 CC = 33pF 0 20 2k -10 10k Frequency, F (Hz) 6 100k 200k 100k 1M 10M Frequency, F (Hz) PA15FLU Rev L PA15FL • PA15FLA Figure 8: Small Signal Response Figure 9: Phase Response 45 120 90 CC = 33pF 80 CC = Open Phase, ˇ;Σ) Open Loop Gain, A (dB) 100 60 40 125 CC = Open 180 20 CC = 33pF 225 0 -20 10 100 1k 10k .1M 1M 270 100k 10M 1M Frequency, F (Hz) Frequency, F (Hz) Figure 11: Swing from -VS 10 85°C 8 125°C 6 –55°C 4 25°C 2 40 80 120 Load Current, I (mA) PA15FLU Rev L 160 200 Voltage Drop From Supply, VOUT - ( -VS) (V) Voltage Drop From Supply, +VS - VOUT (V) Figure 10: Swing from +VS 0 10M 24 20 85°C 16 12 125°C 8 4 –55°C 25°C 0 0 40 80 120 160 200 Load Current, I (mA) 7 PA15FL • PA15FLA Figure 12: Open Loop Output Impedance Figure 13: Harmonic Distortion 400 0.3 RL = 1K CC = Open AV = 30 CC = Open 0.1 300 ŝƐƚŽƌƟŽŶ;йͿ Output Impedance, R (ɏ) 350 250 200 150 5W 0.01 50mW 100 50 0 10k 100k 1M 3M 0.001 30 100 Frequency, F (Hz) 120 WŽǁĞƌ^ƵƉƉůLJZĞũĞĐƟŽŶ͕W^Z;ĚͿ ŽŵŵŽŶDŽĚĞZĞũĞĐƟŽŶ͕DZ;ĚͿ 30k Figure 15: Power Supply Rejection 100 CC = Open 80 60 40 100 80 60 40 20 0 100 1k 10k Frequency, F (Hz) 8 10k Frequency, F (Hz) Figure 14: Common Mode Rejection 20 10 1k .1M 1M 1 10 100 1k 10k .1M 1M 10M Frequency, F (Hz) PA15FLU Rev L PA15FL • PA15FLA 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. Figure 16: SOA KƵƚƉƵƚƵƌƌĞŶƚ&ƌŽŵнVS ŽƌͲVS ;ŵA) 500 ϮϬ 300 ϭϬ Ϭŵ Ϭŵ Ɛ 200 Ɛ  ͕d C  100 ͕d C ͕d C 5° =8 C 5°  50 =2 C =1 25 °C 30 20 10 25 WƵůƐĞƵƌǀĞƐΛϭϬйƵƚLJLJĐůĞDĂdž 50 75 100125 250 500 ^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕VS-VOUT (VOUT) PA15FLU Rev L 9 PA15FL • PA15FLA 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.apexana‐ log.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and Evaluation Kits. TYPICAL APPLICATION Piezo positioning may be applied to the focusing of segmented mirror systems. The composite mirror may be composed of hundreds of elements, each requiring focusing under computer control. In such com‐ plex systems the PA15FL reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the SIP package. Figure 17: Typical Application (Low Power, Piezoelectric Positioning) PHASE COMPENSATION Gain CC* RC ≥1 33pF 1 kΩ ≥10 OPEN OPEN CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external connec‐ tion diagram. The minimum value is 2Ω, 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 150Ω. 0.6V R CL    = ----------------I CL  A  10 PA15FLU Rev L PA15FL • PA15FLA INPUT PROTECTION Although the PA15FL can withstand differential input voltages up to ±25V, additional external protection is recommended. In most applications 1N4148 or 1N914 signal diodes are sufficient (D1‐D4 in Figure 17A). In more demanding applications where low leakage or low capacitance are of concern 2N4416 or 2N5457‐ 2N5459 JFETs connected as diodes will be required (Q1‐Q4 in Figure 17B). In either case the input differential voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. Figure 18: Overvoltage Protection 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 per‐ formance 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 are 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. STABILITY The PA15FL has sufficient phase margin to be stable with most capacitive loads at a gain of 10 or more, using the recommended phase compensation. The PA15FL 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 8 and 9 to avoid spurious oscillation. PA15FLU Rev L 11 PA15FL • PA15FLA PACKAGE DESIGN Part Number Apex Package Style Description PA15AFU FU 10‐Pin SIP w/ formed leads PA15FL FL 10‐Pin SIP PA15FLA FL 10‐Pin SIP PA15FU FU 10‐Pin SIP w/ formed leads PACKAGE STYLE FL 12 PA15FLU Rev L PA15FL • PA15FLA PACKAGE STYLE FU NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). 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APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may be trademarks of their respective holders. PA15FLU Rev L 13