PA93 PA93 ® P r o d uPA93 ct Innovation From High Voltage Power Operational Amplifiers FEATURES DESCRIPTION The PA93 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 8A and pulse currents up to 14A. 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 output stage is biased AB for linear operation. External compensation provides flexibility in choosing bandwidth and slew rate for the application. Apex Precision Power’s Power SIP package uses a minimum of board space allowing for high density circuit boards. The Power SIP package is electrically isolated. ♦ HIGH VOLTAGE — 400V (±200V) ♦ LOW QUIESCENT CURRENT — 10mA ♦ HIGH OUTPUT CURRENT — 8A ♦ PROGRAMMABLE CURRENT LIMIT APPLICATIONS ♦ PIEZOELECTRIC POSITIONING ♦ HIGH VOLTAGE INSTRUMENTATION ♦ ELECTROSTATIC TRANSDUCERS ♦ PROGRAMMABLE POWER SUPPLIES UP TO 390V EQUIVALENT SCHEMATIC +VS R1A C1 R1B Q1 R3 Q3 Q2 R4 Q4 Q6 CC2 Q5 CC1 Q14B Q14A –IN ILIM Q8 R7 Q11 R6 R5 R8 R9 Q12 OUT Q13 R15 +IN Q16 Q15 R11 –VS Q18 R12 EXTERNAL CONNECTIONS 1 2 3 4 5 6 7 8 9 10 11 12 PATENTED Rc –IN Cc RCL +IN * IQ (See text.) TO LOAD AND FEEDBACK * –Vs +Vs * Bypassing required. PA93U www.cirrus.com 12-pin SIP PACKAGE STYLE DP Formed leads available See package style EE Copyright © Cirrus Logic, Inc. 2010 (All Rights Reserved) MAR 20101 APEX − PA93UREVJ ® PA93 Product Innovation From 1. CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min Max Units SUPPLY VOLTAGE, +VS to -VS 400 V OUTPUT CURRENT, source, sink, peak, within SOA 14 A POWER DISSIPATION, continuous @ TC = 25ºC 125 W INPUT VOLTAGE, differential -20 20 V INPUT VOLTAGE, common mode -VS VS V TEMPERATURE, pin solder, 10s max. 260 °C TEMPERATURE, junction (Note 2) 150 °C TEMPERATURE RANGE, storage −40 85 °C OPERATING TEMPERATURE RANGE, case −25 85 °C CAUTION The PA93 is constructed from MOSFET transistors. ESD handling procedures must be observed. The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. SPECIFICATIONS Parameter Test Conditions1 Min Typ Max Units 2 10 mV 15 50 µV/°C OFFSET VOLTAGE vs. supply 10 25 OFFSET VOLTAGE vs. time 75 BIAS CURRENT, initial 200 INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE vs. temperature Full temperature range BIAS CURRENT vs. supply 4 OFFSET CURRENT, initial 50 INPUT IMPEDANCE, DC 10 INPUT CAPACITANCE 11 4 COMMON MODE VOLTAGE RANGE (Note 3) ±Vs Ŧ 15 COMMON MODE REJECTION, DC VCM = ±90V NOISE 100KHz BW, RS = 1KΩ, CC = 10pF 80 µV/V µV/kHz 2000 pA pA/V 500 pA Ω pF V 98 dB 1 µV RMS 111 dB GAIN OPEN LOOP @ 15Hz RL = 2KΩ, CC = 10pF 94 GAIN BANDWIDTH PRODUCT @ 1MHz RL = 2KΩ, CC = 10pF 12 MHz POWER BANDWIDTH RL = 2KΩ, CC = 10pF 30 KHz PHASE MARGIN Full temp range 60 ° ±VS Ŧ 10 V 50 V/µS OUTPUT VOLTAGE SWING (Note 3) IO = 8mA CURRENT, continuous 8 SLEW RATE, A V = 100 CC = 10pF CAPACITIVE LOAD, A V = +1 Full temp range 2 ±VS Ŧ 12 1 A nF PA93U ® PA93 Product Innovation From Parameter Test Conditions1 SETTLING TIME to 0.1% Min Typ CC = 10pF, 2V step RESISTANCE, no load Max Units 1 µS 10 Ω POWER SUPPLY VOLTAGE (Note 5) ±40 ±150 ±200 V 10 14 mA CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case (Note 4) Full temp range, F > 60Hz 0.7 °C/W RESISTANCE, DC, junction to case Full temp range, F < 60Hz 1 °C/W RESISTANCE, junction to air Full temp range TEMPERATURE RANGE, case Meets full range specifications 30 °C/W -25 +85 °C NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100 CC = 220pF. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. 3. +VS and –VS denote the positive and negative power supply rail respectively. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. TYPICAL APPLICATION RF LOW POWER, PIEZOELECTRIC POSITIONING +VS 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 complex systems the PA93 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. R IN 1 COMPUTER FOCUS COMMAND VOLTAGE 7,8 50 0 270 100k 25 50 75 100 125 CASE TEMPERATURE, TC (°C) N LOOP GAIN, A (dB) 40 30 PA93U 20 10 CC = 220pF CC = 100pF CC = 47pF CC = 10pF OP FROM SUPPLY, VS – VO (V) SMALL SIGNAL RESPONSE 50 CC = 220pF CC = 100pF CC = 47pF CC = 10pF 225 25 0 180 9 8 7 1M 10M FREQUENCY F (Hz) 9,10 R CL NORMALIZED QUIES. CURRENT 1.8 1.6 1.4 1.2 1.0 25 OUTPUT VOLTAGE SWING 75 125 50 100 CASE TEMPERATURE, TC (°C) POWER RESPONSE 400 UT VOLTAGE, VO (VP-P) PHASE, Ф (°) INTERNAL POWER DISSIPATION PHASE RESPONSE 135 75 V OUT –V S 90 100 6 2 NORMALIZED QUIESCENT CURRENT, IQ (X) POWER DERATING PIEZO DRIVE PA93 TYPICAL PERFORMANCE GRAPHS 125 11,12 100 CC = 10pF CC = 47pF 3 50 180 PA93 270 100k 25 50 75 100 125 CASE TEMPERATURE, TC (°C) 1.2 30 20 10 0 –10 100K 1M 10M FREQUENCY, F (Hz) 6 0 4 2 6 OUTPUT CURRENT, IO (A) PO = 1W PO = 20W PO = 62W 40 30 DISTORTION, (%) 10 8 6 4 3 .01 2 1 10 20 30 40 60 100 200 300 EXT. COMPENSATION CAPACITOR, CC (pF) 100 CC = 100pF CC = 220pF 10 1K 8 .001 100 1K FREQUENCY, F (Hz) 10K CC = 10pF CC = 47pF 10K 100K FREQUENCY, F (Hz) 1M INPUT NOISE VOLTAGE HARMONIC DISTORTION .1 20 POWER RESPONSE 7 SLEW RATE 60 75 125 50 100 CASE TEMPERATURE, TC (°C) 400 8 5 1.0 25 OUTPUT VOLTAGE SWING 9 INPUT NOISE VOLTAGE, VN (nV√Hz) OPEN LOOP GAIN, A (dB) CC = 220pF CC = 100pF CC = 47pF CC = 10pF 40 VOLTAGE DROP FROM SUPPLY, VS – VO (V) SMALL SIGNAL RESPONSE 1M 10M FREQUENCY F (Hz) OUTPUT VOLTAGE, VO (VP-P) 0 1.4 Product Innovation From 50 SLEW RATE, (V/μS) CC = 220pF CC = 100pF CC = 47pF CC = 10pF ® 225 25 0 NORMALIZED QUIESCENT CU PHASE, Ф (°) INTERNAL POWER DIS 75 20 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) 8 PHASE COMPENSATION 6 GAIN CC* RC ≥1 220pF 100Ω ≥2 100pF 100Ω ≥4 47pF 0Ω ≥17 10pF 0Ω *CC Never to be <10pF. CC to be rated for the full supply voltage +VS to -VS. Use ceramic NPO (COG) type. 4 2 0 .1 .4 .2 .3 .5 .6 RESISTOR VALUE, RCL (Ω) 0 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. CURRENT LIMIT For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. 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 16 ohms. 4 .65 RCL = ILIM PA93U ® PA93 Product Innovation From SAFE OPERATING AREA (SOA) SAFE OPERATING CURVES The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external load. INPUT PROTECTION 20 OUTPUT CURRENT FROM +VS OR –VS, (A) 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. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. SOA DC, TC = 25C 10 8 6 200mS 4 3 10 0m 2 S DC ,T 1 .8 .6 C DC ,T C .4 .3 =1 =8 5C 25 C .2 .1 .08 .06 10 20 30 40 60 80 100 200 300 500 Although the PA93 can withstand differential voltages up to ±20V, additional external protection is recommended. SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V) Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differen+VS tial input voltage will be clamped to ±1.4V. This is sufficient overdrive to Z1 produce maximum power bandwidth. POWER SUPPLY PROTECTION –IN 1 11, 12 Q1 Q3 Unidirectional zener diode transient suppressors are recommended as 6 PA93 protection on the supply pins. See Figure 2. The zeners clamp transients Q2 Q4 to voltages within the power supply rating and also clamp power supply +IN 7, 8 2 reversals to ground. Whether the zeners are used or not, the system power supply should be evaluated for transient performance including Z2 FIGURE 2. power-on overshoot and power-off polarity reversals as well as line regu- OVERVOLTAGE –VS PROTECTION lation. 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 is 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 PA93 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 4 and 5 to avoid spurious oscillation. QUIESCENT CURRENT REDUCTION When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This lowers quiescent power but also raises distortion since the output stage is then class C biased. The output stage bias current is nominally set at 1mA. Pin 3 may be left open if not used. PA93U 5 PA93 ® Product Innovation From 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). 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