HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER PA93 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 — 8A PROGRAMMABLE CURRENT LIMIT APPLICATIONS • • • • PIEZOELECTRIC POSITIONING HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC TRANSDUCERS PROGRAMMABLE POWER SUPPLIES UP TO 390V TYPICAL APPLICATION RF 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’s Power SIP package uses a minimum of board space allowing for high density circuit boards. 12 R1 R2 Q1 C1 R3 R4 PIEZO DRIVE 4 CC1 Q5 5 CC2 COMPUTER FOCUS COMMAND VOLTAGE 9,10 7,8 R8 Q8 R7 –V S GAIN ≥1 Cc* 220pF Rc 100Ω ≥2 100pF 100Ω ≥4 47pF 0Ω ≥17 10pF 0Ω 10 6 OUT R9 Q12 3 IQ 2 +IN Q13 Q14 R10 *Cc Never to be < 10pF. Cc To be rated for the full supply voltage +V to –Vs. Use ceramic NPO (COG) type. EXTERNAL CONNECTIONS Package: SIP03 Q16 Q15 R11 –VS 7 R CL LOW POWER, PIEZOELECTRIC POSITIONING ILIM 9 R6 R5 V OUT 2 Q11 1 –IN 6 PA93 Q4 Q6 11,12 1 PHASE COMPENSATION Q3 Q2 R IN 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. EQUIVALENT SCHEMATIC 11 +VS +VS 1 2 3 R12 4 Rc –IN 5 6 7 8 IQ 11 12 * * 8 (See text.) 10 Cc RCL +IN 9 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 PA93 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 14A, within SOA 125W ±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 12 30 60 dB MHz kHz ° ±VS 12 8 ±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 = 8A ± 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 ±40 ±150 10 ±200 14 V mA .7 1 °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 = 220pF. 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 PA93 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 TYPICAL PERFORMANCE GRAPHS 90 PHASE, Φ (°) 135 50 180 Cc = 220 pF Cc = 100 pF 225 Cc = 47 pF Cc = 10 pF 25 0 270 100k 25 50 75 100 125 CASE TEMPERATURE, TC (°C ) SMALL SIGNAL RESPONSE 50 Cc = 220 pF Cc = 100 pF Cc = 47 pF Cc = 10 pF 40 30 20 10 0 –10 100K 1M 10M FREQUENCY, F (Hz) 7 6 5 0 6 2 4 OUTPUT CURRENT, I O (A) HARMONIC DISTORTION DISTORTION, (%) 4 3 Po = 1W Po = 20W Po = 62W .01 2 1 20 30 40 60 100 200 300 10 EXT. COMPENSATION CAPACITOR, C C (pF) 1.4 1.2 1.0 0 75 125 50 100 CASE TEMPERATURE, Tc (°C) POWER RESPONSE 8 40 30 10 8 6 1.6 400 .1 20 NORMALIZED QUIES. CURRENT 1.8 OUTPUT VOLTAGE SWING 9 SLEW RATE 60 SLEW RATE, (V/ µ S) 1M 10M FREQUENCY F (Hz) OUTPUT VOLTAGE, VO (VPP ) 75 .001 100 1K 10K FREQUENCY, F (Hz) 100 CC = 10pF CC = 47pF CC = 100pF C C = 220pF 10 8 1K INPUT NOISE VOLTAGE, VN (nV Hz) 100 0 OPEN LOOP GAIN, A (dB) PHASE RESPONSE 125 VOLTAGE DROP FROM SUPPLY, V S – VO (V) INTERNAL POWER DISSIPATION POWER DERATING NORMALIZED QUIESCENT CURRENT, I Q (X) PA93 20 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, I LIM (A) 8 6 4 2 0 0 .2 .3 .5 .6 .1 .4 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 PA93 GENERAL INPUT PROTECTION Please read the “General Operating Considerations” section, which covers stability, supplies, heatsinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsinks, and mounting hardware, consult the “Accessory and Package Mechanical Data” section of the handbook. Although the PA93 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) DC, TC = 25°C 200mS 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 +VS 4 3 Z1 10 0m 2 S DC ,T 1 .8 .6 C DC ,T C 1 –IN Q1 =8 =1 Q2 +IN FIGURE 2. OVERVOLTAGE PROTECTION 30 40 60 80 100 6 PA93 .2 20 11, 12 Q3 5° C 25 °C .4 .3 .1 .08 .06 10 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. 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. 20 10 8 6 POWER SUPPLY PROTECTION 200 300 Q4 2 7, 8 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. PA93U REV. B MARCH 1999 © 1999 Apex Microtechnology Corp.