HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER PA92 HTTP://WWW.APEXMICROTECH.COM M I C R O T E C H N O L O G Y (800) 546-APEX (800) 546-2739 FEATURES • • • • HIGH VOLTAGE — 400V (±200V) LOW QUIESCENT CURRENT — 10mA HIGH OUTPUT CURRENT — 4A PROGRAMMABLE CURRENT LIMIT APPLICATIONS • • • • PATENTED PIEZOELECTRIC POSITIONING HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC TRANSDUCERS PROGRAMMABLE POWER SUPPLIES UP TO 390V TYPICAL APPLICATION RF DESCRIPTION +VS The PA92 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 4A and pulse currents up to 7A. 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’s Power SIP package uses a minimum of board space allowing for high density circuit boards. R IN 11,12 1 PIEZO DRIVE 6 PA92 V OUT 2 COMPUTER FOCUS COMMAND VOLTAGE 9,10 R CL 7,8 –V S LOW POWER, PIEZOELECTRIC POSITIONING EQUIVALENT SCHEMATIC 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 PA92 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. 12 11 +VS R1 R2 Q1 C1 R3 PHASE COMPENSATION Q3 Q2 R4 Q4 Q6 4 CC1 Q5 5 CC2 ILIM 9 Q8 R7 10 Q11 1 –IN 6 OUT R6 R5 R8 R9 Q12 Cc* Rc 150pF 100Ω ≥2 100pF 100Ω ≥3 47pF 0Ω ≥12 10pF 0Ω *Cc Never to be < 10pF. Cc To be rated for the full supply voltage +V to –Vs. Use ceramic NPO (COG) type. Q13 EXTERNAL CONNECTIONS 3 IQ 2 +IN GAIN ≥1 Package: SIP03 Q14 R10 Q16 1 2 3 4 5 6 7 8 9 10 11 12 Q15 R11 –VS 7 8 Rc R12 –IN Cc * RCL +IN * IQ (See text.) TO LOAD AND FEEDBACK –Vs +Vs * Bypassing required. APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA92 SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, source, sink, peak POWER DISSIPATION, continuous @ TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case ABSOLUTE MAXIMUM RATINGS 400V 7A, within SOA 80W ±20V ±VS 220°C 150°C –65 to +150°C –55 to +125°C SPECIFICATIONS TEST CONDITIONS 1 PARAMETER MIN TYP MAX UNITS 2 15 10 75 200 4 50 1011 4 10 50 25 98 1 mV µV/°C µV/V µV/√kh pA pA/V pA Ω pF V dB µVrms 94 111 18 30 60 dB MHz kHz ° ±VS 12 4 ±VS 10 V A V/µs nf µs Ω INPUT Full temperature range VCM = ±90V 100KHz BW, RS = 1KΩ, CC = 10pF ±VS 15 80 ± OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial BIAS CURRENT, vs. supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE3 COMMON MODE REJECTION, DC NOISE 2000 500 GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN RL = 2KΩ, CC = 10pF RL = 2KΩ, CC = 10pF RL = 2KΩ, CC = 10pF Full temperature range OUTPUT CC = 10pF Full temperature range CC = 10pF, 2V step ± IO = 4A ± VOLTAGE SWING3 CURRENT, continuous SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load 50 1 1 10 POWER SUPPLY VOLTAGE 5 CURRENT, quiescent, See note 5 ±50 ±150 10 ±200 14 V mA 1 1.5 °C/W °C/W °C/W °C THERMAL RESISTANCE, AC, junction to case 4 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: 1. 2. 3. 4. 5. CAUTION Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications 30 –25 +85 Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100 CC = 150pF. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. +VS and –VS denote the positive and negative power supply rail respectively. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. The PA92 is constructed from MOSFET transistors. ESD handling procedures must be observed. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PHASE RESPONSE 60 135 0 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE 40 30 Cc = 150 pF Cc = 100 pF Cc = 47 pF Cc = 10 pF 20 10 0 –10 100K 1M 10M FREQUENCY, F (Hz) Cc = 150 pF 225 Cc = 100 pF Cc = 47 pF Cc = 10 pF 270 100k 1M 10M FREQUENCY F (Hz) 7.5 7.0 6.5 0 DISTORTION, (%) SLEW RATE, (V/ µ S) 4 3 3 1 2 OUTPUT CURRENT, I O (A) HARMONIC DISTORTION Po = 1W Po = 20W Po = 62W 40 30 10 8 6 .01 2 1 30 200 300 10 60 100 EXT. COMPENSATION CAPACITOR, C C (pF) 1.0 0 125 50 100 75 CASE TEMPERATURE, Tc (°C) POWER RESPONSE 8.0 .1 20 1.2 400 SLEW RATE 60 1.4 OUTPUT VOLTAGE SWING 8.5 OUTPUT VOLTAGE, VO (VPP ) 20 180 NORMALIZED QUIES. CURRENT 1.6 .001 100 1K 10K FREQUENCY, F (Hz) 100 CC = 10pF CC = 47pF CC = 100pF 10 1K 4 INPUT NOISE VOLTAGE, VN (nV Hz) PHASE, Φ (°) 90 40 NORMALIZED QUIESCENT CURRENT, I Q (X) POWER DERATING 80 50 OPEN LOOP GAIN, A (dB) PA92 VOLTAGE DROP FROM SUPPLY, V S – VO (V) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS 20 C C = 150pF 10K 100K FREQUENCY, F (Hz) 1M INPUT NOISE VOLTAGE 15 10 7 5 3 2 10 100 1K 10K FREQUENCY, F (Hz) 100K CURRENT LIMIT CURRENT LIMIT, ILIM (A) 4 3 2 1 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 RESISTOR VALUE, R CL ( Ω) APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] OPERATING CONSIDERATIONS PA92 GENERAL INPUT PROTECTION Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; Apex’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. Although the PA92 can withstand differential voltages up to ±20V, additional external protection is recommended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differential input voltage will be clamped to ±1.4V. This is sufficient overdrive to produce maximum power bandwidth. 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. .65 RCL = ILIM 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. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. 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. OUTPUT CURRENT FROM +VS OR –VS, (A) 8 6 DC, TC = 25°C 200mS 4 POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See Figure 2. 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 performance including poweron 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 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 PA92 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. +VS 2 Z1 10 0m S 1 .8 .6 T = C T C .4 .3 = 12 1 –IN Q1 85 °C 11, 12 Q3 6 PA92 Q2 5° C +IN Q4 2 7, 8 .2 .1 .08 .06 .04 10 FIGURE 2. OVERVOLTAGE PROTECTION 20 30 40 60 80 100 200 300 Z2 –VS 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V) This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. PA92U REV. C MAY 2000 © 2000 Apex Microtechnology Corp.