Transcript
PA88PA88 • PA88A • PA88A
PA88, PA88A
High Voltage Power Operational Amplifiers FEATURES • • • • •
HIGH VOLTAGE — 450V (±225V) LOW QUIESCENT CURRENT — 2mA HIGH OUTPUT CURRENT — 100mA PROGRAMMABLE CURRENT LIMIT LOW BIAS CURRENT — FET Input PATENTED
APPLICATIONS • • • •
8-PIN TO-3 PACKAGE STYLE CE
PIEZOELECTRIC POSITIONING HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC TRANSDUCERS PROGRAMMABLE POWER SUPPLIES UP TO 440V
TYPICAL APPLICATION RF +V S
DESCRIPTION The PA88 is a high voltage, low quiescent current MOSFET operational ampliier designed for output currents up to 100mA. Output voltages can swing up to ±215V with a dual supply and up to +440 volts with a single supply. 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. All internal biasing is referenced to a bootstrapped zener-MOSFET current source. As a result, the PA88 features an unprecedented supply range and excellent supply rejection. The MOSFET output stage is biased on for linear operation. External compensation provides user lexibility. This hybrid circuit utilizes beryllia (BeO) substrates, 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 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible thermal isolation washers and/or improper mounting torque will void the product warranty. Please see “General Operating Considerations”.
R IN PIEZO DRIVE
COMPUTER FOCUS COMMAND VOLTAGE –V S
LOW POWER, PIEZOELECTRIC POSITIONING 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 PA88’s advantage of low quiescent power consumption reduces the costs of power supplies and cooling, while providing the interface between the computer and the high voltage drive to the piezo positioners.
EXTERNAL CONNECTIONS RC
D1 Q1
Q2
Q4
D19 COMP 7 8
– IN 5
Q6
Q10A
Q7
+ IN 4
Q8
COMP
Q12
Q11
PHASE COMPENSATION –VS
GAIN
6
8
5 –IN TOP VIEW
1 OUT
Q10B
COMP
7
CC
Q9 CL 2
V OUT
PA88
EQUIVALENT SCHEMATIC 3 +VS
CC
4 OUT
1 2 RCL
CL
3 +VS
+IN
1 10 20 100
CC
RC
68pf 33pf 15pf 3.3pf
100Ω 100Ω 100Ω —
RCL = .7 ILIM CC RATED FOR FULL SUPPLY VOLTAGE
Q17 Q18
Q13 Q16 D2
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–VS 6 Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved)
OCT 20121 PA88U REVQ
PA88 • PA88A ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, source, sink 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
SPECIFICATIONS TEST CONDITIONS 1
PARAMETER 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 NOISE
VCM = ±90V 100kHz BW, RS = 1KΩ, CC = 15pf
GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN
RL = 2KΩ, CC = OPEN RL = 2KΩ, CC = 15pf, RC = 100Ω RL = 2KΩ, CC = 15pf, RC = 100Ω Full temperature range
OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE, AV = 20 SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load
Full temp. range, IO = ±75mA Full temp. range, IO = ±20mA TC = 85°C CC = 15pf, RC = 100Ω CC = OPEN Full temperature range CC = 15pf, RC = 100Ω, 2V step RCL = 0
POWER SUPPLY VOLTAGE6 CURRENT, quiescent, THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case
MIN
.5 10 1 75 5 .01 2.5 1011 4
Full temperature range
See note 6
Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range speciications
PA88 TYP
±VS–15 90
96
MAX
UNITS
.5 10 *
* *
mV µV/°C µV/V µV/√kh pA pA/V pA Ω pF V dB µVrms
*
* * * *
dB MHz kHz °
* *
* * * * *
V V mA V/µs V/µs pf µs Ω
.25 5 * * 3 * 3 * *
100 * *
111 2.1 6 60
PA88A TYP
MAX
50
110 2
±200 1.7
MIN
2 30 5
±VS–16 ±VS–14 ±VS–10 ±VS–5.2 ±100 8 30 470 10 100 ±15
450V See SOA 15W ±25V ±VS 350°C 150°C –65 to +150°C –55 to +125°C
20
* * * ±225 2
*
* *
5.0 8.3 30 –25
10
* *
V mA
* *
°C/W °C/W °C/W °C
* +85
*
*
NOTES: * The speciication of PA88A is identical to the speciication for PA88 in applicable column to the left. 1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input speciications are ± value given. Power supply voltage is typical rating. 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 power supply rail respectively. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.
CAUTION
2
The PA88 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.
PA88U
PA88 • PA88A
POWER DERATING
PHASE RESPONSE
T = TC
2.5
CC = 33pF
–90 CC = 68pF
–120 –150
CC = 33pF
–180
0
0
25 50 75 100 125 TEMPERATURE, T (°C)
150
–210
OUTPUT VOLTAGE SWING
20
2 20
1
.0001
COMMON MODE REJECTION 120 100 80 60 40 20
1
PA88U
10
100 1K 10K .1M FREQUENCY, F (Hz)
1M
25 1K
30 300 3K FREQUENCY, F (Hz)
3
30K
15 10 7 5
3 2 10
POWER SUPPLY REJECTION 120
120 100
80 60 40 20
1
10
100 1K 10K .1M FREQUENCY, F (Hz)
1M
100 1K 10K FREQUENCY, F (Hz)
1M
CURRENT LIMIT 200
100
50K 100K 2K 3K 5K 10K 20K FREQUENCY, F (Hz)
INPUT NOISE
20
140
CURRENT LIMIT, ILIM (mA)
DISTORTION, (%)
.01 .001
0 10 20 30 40 50 60 70 COMPENSATION CAPACITOR, CC (pF)
COMMON MODE REJECTION, CMR (dB)
.1
2
POWER SUPPLY REJECTION, PSR (dB)
SLEW RATE, (V/μS)
3
50
100
RL = 2K PO = 2.5W AV = 30
1
5
40 60 80 OUTPUT CURRENT, IO (mA)
75
HARMONIC DISTORTION
30
10
TC=-55°C
TC=25°C
f
4
.3p
6
=3
8
125 100
f
10
f
TC=85°C
12
250
5p
14
CC
TC=125°C
10
20
POWER RESPONSE 500
Positive 18 Negative 16
100 300 200 450 TOTAL SUPPLY VOLTAGE, VS (V)
=1
SLEW RATE
50
0
CC
100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
1.0
100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
f
10
1.25
3p
1
1.5
8p
0
°C T C = 25 °C 5 T C = -5
1.75
=3
CC = 68pF
20
10
2.0
=6
CC = 33pF
40
1
25°C
TC = 1
CC
CC = 15pF
60
CC = 3.3pF
2.25
CC
CC = 3.3pF
80
VOLTAGE DROP FROM SUPPLY, Vs-Vo, (V)
SMALL SIGNAL RESPONSE
100
CC = 68pF
OUTPUT VOLTAGE, VO (VPP)
T = TA
120
OPEN LOOP GAIN, A (dB)
PHASE, Ф (°)
7.5 5
CC = 3.3pF
–60
10
–20
QUIESCENT CURRENT, IQ (mA)
–30
12.5
QUIESCENT CURRENT
2.5
0
INPUT NOISE VOLTAGE, VN (nV/ Hz)
INTERNAL POWER DISSIPATION, P (W)
15
70 50 30 20 10
5 50 3 10 20 100 150 CURRENT LIMIT RESISTOR, RCL ( )
3
PA88 • PA88A GENERAL
INPUT PROTECTION
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.
Although the PA88 can withstand differential input voltages up to ±25V, additional external protection is recommended, and required at total supply voltages above 300 volts. In most applications 1N4148 or 1N914 signal diodes are sufficient (D1, D2 in Figure 2a). In more demanding applications where low leakage or low capacitance are of concern 2N4416 or 2N54572N5459 JFETs connected as diodes will be required (Q1, Q2 in Figure 2b). In either case the input differential voltage will be clamped to ±.7V. 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. 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
SAFE OPERATING AREA (SOA) 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.
SOA
OUTPUT CURRENT FROM +VS OR –VS, (mA)
250
10
150
0m
100
,T
C
DC
50
,T
C
C
=
25
°C
85
°C
DC
,T
=
S
S
DC
25
0m
20
=
12
5°
C
15 10
5 25
PULSE CURVES @ 10% DUTY CYCLE MAX 50 75 100 125 250 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
NOTE: The output stage is protected against transient lyback. However, for protection against sustained, high energy lyback, external fast-recovery diodes should be used.
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 performance including power-on overshoot and power-off polarity reversal 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.
STABILITY The PA88 has sufficient phase margin to be stable with most capacitive loads at a gain of 4 or more, using the recommended phase a. +VS compensation. The PA88 is exterZ1 nally compensated and performance can 3 5 be tailored to the –IN application. Use the D1 D2 PA88 graphs of small signal +IN response and power 4 6 response as a guide. The compensation Z2 capacitor C C must be rated at 500V –VS working voltage. An b. +VS NPO capacitor is Z1 recommended. The compensation net3 work CCRC must be 5 –IN mounted closely to Q1 Q2 PA88 the ampliier pins 7 and 8 to avoid spuri- +IN 4 ous oscillation. 6 Z2 –VS
FIGURE 2. OVERVOLTAGE PROTECTION
4
PA88U
PA88 • PA88A
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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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