Transcript
PA89PA89 • PA89A • PA89A
PA89, PA89A
High Voltage Power Operational Amplifiers FEATURES • • • • • •
1140V P-P SIGNAL OUTPUT WIDE SUPPLY RANGE — ±75V to ±600V PROGRAMMABLE CURRENT LIMIT 75 mA CONTINUOUS OUTPUT CURRENT HERMETIC SEALED PACKAGE INPUT PROTECTION
PATENTED
APPLICATIONS • • • •
HIGH VOLTAGE MO-127 PACKAGE STYLE DC
PIEZOELECTRIC POSITIONING HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC DEFLECTION SEMICONDUCTOR TESTING
TYPICAL APPLICATION Ultra-high voltage capability combined with the bridge ampliier coniguration makes it possible to develop +/–1000 volt peak swings across a piezo element. A high gain of –50 for A1 insures stability with the capacitive load, while “noise-gain” compensation Rn and Cn on A2 insure the stability of A2 by operating in a noise gain of 50.
DESCRIPTION The PA89 is an ultra high voltage, MOSFET operational ampliier designed for output currents up to 75 mA. Output voltages can swing over 1000V p-p. The safe operating area (SOA) has no second breakdown limitations and can be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode input circuit coniguration and 120dB open loop gain. All internal biasing is referenced to a bootstrapped zener-MOSFET current source, giving the PA89 a wide supply range and excellent supply rejection. The MOSFET output stage is biased for class A/B linear operation. External compensation provides user lexibility. The PA89 is 100% gross leak tested to military standards for long term reliability. This hybrid integrated circuit utilizes a beryllia (BeO) substrate, thick ilm resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The MO-127 High Voltage, Power Dip™ package is hermetically sealed and electrically isolated. The use of compressible thermal washers will void the product warranty.
50R
50R
R
Q1
Q2
COMP 9 10 –IN 1
Q22
Q23
Q25A
Q25B
–600V
Q26
EXTERNAL CONNECTIONS
D34
D35
D31
+IN
1
12
2
11
N/C
3
N/C
4
–VS
6 OUT
Q44 D5
TOP VIEW
10
–VS 5
RESERVED CC COMP
9
5
8
6
7
+VS
COMP
RC
CL R CL =
CL
Q42
Q45
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RESERVED
–IN
7
Q29 Q36
D30
–600V
OUT Q20
Cn
SINGLE AXIS MICRO-POSITIONING
.7 I
LIM
R CL
+IN 2
A2 PA89 PIEZO TRANSDUCER
Q19
D57
R A1 PA89
V IN
8 +VS
D1
+600V
+600V
SIMPLIFIED SCHEMATIC Q3
50R
PHASE COMPENSATION Gain 1 10 15 100
CC 470pF 68pF 33pF 15pF
RC 470Ω 220Ω 220Ω 220Ω
Note: CC must be rated for full supply voltage –Vs to +Vs. See details under “EXTERNAL COMPONENTS”.
Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved)
OCT 2012 1 PA89U REVM
PA89 • PA89A
SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal at TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS MIN
INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial3 BIAS CURRENT,vs. supply OFFSET CURRENT, initial3 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE4 COMMON MODE REJECTION, DC INPUT NOISE
Full temperature range Full temperature range, VCM = ±90V 10kHz BW, RS = 10K, CC = 15pF
±VS 50 96
GAIN OPEN LOOP GAIN at 15Hz GAIN BANDWIDTH PRODUCT POWER BANDWIDTH PHASE MARGIN
RL = 10k, CC = 15pF RL = 10k, CC = 15pF, AV = 100 RL = 10k, CC = 15pF, VO = 500V p-p Full temperature range, AV = 10
108
OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE CAPACITIVE LOAD, Av = 10 CAPACITIVE LOAD, Av>10 SETTLING TIME to .1%
IO = 75mA Full temperature range, IO = 20mA Full temperature range CC = 15pF, AV = 100 Full temperature range Full temperature range RL = 10KΩ, 10V step, Av = 10 Full temperature range
Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range speciications
MIN
2 30
50 * *
110 4 120 10 5 60
PA89A TYP .25 5 * * 3 * 3 * *
50
±VS 45 ±VS 30 ±VS 20 ±VS 12 75 12 16 ± ±
THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case
.5 10 7 75 5 .01 5 105 4
Full temperature range
MAX
±
POWER SUPPLY VOLTAGE, VS4 CURRENT, quiescent
PA89 TYP
± ±
TEST CONDITIONS 1
PARAMETER
1200V 100mA 40W ±25V ±VS 50V 350°C 150°C –65 to 125°C –55 to 125°C ±
ABSOLUTE MAXIMUM RATINGS
.5 10
mV µV/°C µV/V µV/kh pA pA/V pA MΩ pF V dB µV RMS
10 20
*
* * * *
dB MHz kHz °
* * * *
* *
V V mA V/µs nF
* * *
2
–25
UNITS
*
1 SOA
±75
MAX
*
±500 4.8
±600 6.0
2.1 3.3 15
2.3 3.5 +85
*
*
µs
* *
* *
V mA
* * *
* *
°C/W °C/W °C/W °C
*
NOTES: * The speciication of PA89A is identical to the speciication for PA89 in applicable column to the left. 1. Unless otherwise noted: TC = 25°C, CC = 68pF, RC = 220Ω, and VS = ±500V. Input parameters for bias currents and offset voltage are ± values given. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. 3. Doubles for every 10°C of temperature increase. 4. +VS and –VS denote the positive and negative supply rail respectively. 5. Rating applies only if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
2
The PA89 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes.
PA89U
PA89 • PA89A
16 8
68pf, 220 –180 15pf, 220
0
25 50 75 100 125 150 CASE TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE 15pf, 220 33pf, 220
80 60 40 68pf, 220
20 0
CC, RC 1
100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
10
1
OUTPUT VOLTAGE SWING
30 25 20 15 10 5 0
0
1
VS = ±500V CC = 15pf, RC = 220 RL = 11K AV = 100
.1
VO = 800Vpp
80 60 40 20 0
PA89U
1
10
100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
100
VO = 600Vpp VO = 400Vpp
.001 30
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION
100
100
VO = 100Vpp
.95
.9
POWER SUPPLY REJECTION
60 40 20
1
10
0
100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
200 400 600 800 1000 1200 TOTAL SUPPLY VOLTAGE, VS (V)
POWER RESPONSE
CC = 15pf
600 500 300 CC = 33pf CC = 68pf 100 1K
100 300 1K 3K 10K 30K 100K FREQUENCY, F (Hz)
80
0
1.00
HARMONIC DISTORTION
.01
0 75 25 50. 100 EXT. COMPENSATION CAPACITOR, CC (pF)
25 50 75 OUTPUT CURRENT, IO,(mA)
1.05
1200 1000 800
35
10
5
10 100 1K 10K 100K 1M 10M FREQUENCY F (Hz)
40
SLEW RATE VS COMP
15
CC, RC
45
DISTORTION, THD (%)
20
10
–270
OUTPUT VOLTAGE, VO (VP-P)
0
QUIESCENT CURRENT
1.10
RC = 220 3K 30K 10K FREQUENCY, F (Hz)
100K
INPUT NOISE VOLTAGE
20 15 10 7 5
3 2 10
100 10K 1K FREQUENCY, F (Hz)
100K
CURRENT LIMIT
100 CURRENT LIMIT, ILIM (mA)
OPEN LOOP GAIN, A (dB)
–135
–225
100
SLEW RATE, (V/ μS)
–90
NORMALIZED QUIESCENT CURRENT, IQ (X)
PHASE, Ф (°)
24
120
COMMON MODE REJECTION, CMR (dB)
33pf, 220
–45
32
–20
PHASE RESPONSE
0
INPUT NOISE VOLTAGE, eN (nV/ Hz)
POWER DERATING
40
VOLTAGE DROP FROM SUPPLY, VS-VO (V)
OUTPUT STAGE INTERNAL POWER DISSIPATION, P(W)
TYPICAL PERFORMANCE GRAPHS
80 60 40 20 0
0
20 80 40 60 RESISTOR VALUE, RCL ( )
100
3
PA89 • PA89A GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and speciication interpretation. Visit www.apexanalog.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; Apex Microtechnology’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
STABILITY Although the PA89 can be operated at unity gain, maximum slew rate and bandwidth performance was designed to be obtained at gains of 10 or more. Use the small signal response and phase response graphs as a guide. In applications where gains of less than 10 are required, use noise gain compensation to increase the phase margin of the application circuit as illustrated in the typical application drawing.
SAFE OPERATING AREA (SOA)
OUTPUT CURRENT FROM +VS OR –VS (mA)
The MOSFET output stage of this power operational ampliier 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 lyback. However, for protection against sustained, high energy lyback, external fast-recovery diodes should be used. 100
SOA 10mS 25°C
50
100mS 30
15
125°C
full supply voltage range. For example, with supply voltages of ±500V the possible voltage swing across CC is 1000V. In addition, a voltage coefficient less than 100PPM is recommended to maintain the capacitance variation to less than 5% for this example. It is strongly recommended to use the highest quality capacitor possible rated at least twice the total supply voltage range. Of equal importance are the voltage rating and voltage coeficient of the gain setting resistances. Typical voltage ratings of low wattage resistors are 150 to 250V. In the above example 1000V could appear across the feedback resistor. This would require several resistors in series to obtain the proper voltage rating. Low voltage coefficient resistors will insure good gain linearity. The wattage rating of the feedback resistor is also of concern. A 1 megohm feedback resistor could easily develop 1 watt of power dissipation. Though high voltage rated resistors can be obtained, a 1 megohm feedback resistor comprised of ive 200Kohm, 1/4 watt metal ilm resistors in series will produce the proper voltage rating, voltage coefficient and wattage rating.
CURRENT LIMIT For proper operation the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 3.5 ohm, 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 150 ohms. .7 RCL = ILIM When setting the value for RCL allow for the load current as well as the current in the feedback resistor. Also allow for the temperature coefficient of the current limit which is approximately -0.3% /°C of case temperature rise.
CAUTIONS 85°C
10
5
T = TCASE 3 200 100 300 500 800 1000 1200 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS – VO (V)
SAFE OPERATING CURVES The safe operating area curves deine the maximum additional internal power dissipation the ampliier can tolerate when it produces the necessary output to drive an external load. This is not the same as the absolute maximum internal power dissipation listed elsewhere in the speciication since the quiescent power dissipation is signiicant compared to the total.
EXTERNAL COMPONENTS
The operating voltages of the PA89 are potentially lethal. During circuit design, develop a functioning circuit at the lowest possible voltages. Clip test leads should be used for “hands off” measurements while troubleshooting.
POWER SUPPLY PROTECTION Unidirectional zener diode transient absorbers 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 performance 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 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 ampliier as possible.
The very high operating voltages of the PA89 demand consideration of two component speciications rarely of concern in building op amp circuits: voltage rating and voltage coefficient. The compensation capacitance CC must be rated for the 4
PA89U
PA89 • PA89A
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[email protected]. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To ind 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). Apex Microtechnology reserves the right to make changes without further notice to any speciications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. 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. 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 Microtechnolgy, Inc. All other corporate names noted herein may be trademarks of their respective holders.
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Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved)
OCT 2012 5 PA89U REVM
