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HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA90
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * * HIGH VOLTAGE -- 400V (200V) LOW QUIESCENT CURRENT -- 10mA HIGH OUTPUT CURRENT -- 200mA PROGRAMMABLE CURRENT LIMIT HIGH SLEW RATE -- 300V/s
APPLICATIONS
* * * * PIEZOELECTRIC POSITIONING HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC TRANSDUCERS PROGRAMMABLE POWER SUPPLIES UP TO 390V
TYPICAL APPLICATION
RF +VS
DESCRIPTION
The PA90 is a high voltage, low quiescent current MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 200mA and pulse currents up to 350mA. 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 SIP12 package uses a minimum of board space allowing for high density circuit boards.
R IN 1
11,12 PIEZO DRIVE PA90 6 V OUT
2 COMPUTER FOCUS COMMAND VOLTAGE 9,10 7,8 R CL
-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 PA90 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
12 11 +VS
R1 R2
C1
R3
Q1 Q6 Q5
Q2 5 CC2
Q3 R4 Q4 ILIM 9 Q8 Q11 R7 10 6 OUT Q12 3 IQ Q16 Q13
PHASE COMPENSATION
GAIN 1 5 10 30 Cc* 68pF 10pF 4.7pF NONE Rc 100 100 0 0
4 CC1
1 -IN
R5 R8 R9
R6
*Cc To be rated for the full supply voltage +V to -Vs. Use NPO ceramic (COG) type.
EXTERNAL CONNECTIONS
Q14 R10
1 2 3 4 5 6 7 8 9 10 11 12
2 +IN Q15
Rc
Cc RCL
R11 -VS 7 8
R12
-IN +IN
* *
-Vs +Vs
IQ
(See text.)
TO LOAD AND FEEDBACK
* Bypassing required.
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA90
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, source, sink, peak POWER DISSIPATION, continuous @ TC = 25C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
400V 350mA, within SOA 30W 20V VS 220C 150C -65 to +150C -55 to +125C
SPECIFICATIONS
PARAMETER INPUT 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 GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING3 CURRENT, continuous SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load POWER SUPPLY VOLTAGE 5 CURRENT, quiescent, THERMAL RESISTANCE, AC, junction to case 4 RESISTANCE, DC, junction to case RESISTANCE, junction to air Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range 2.5 4.2 30 C/W C/W C/W See note 5 40 150 10 200 14 V mA IO = 200mA CC = OPEN Full temperature range CC = OPEN, 2V step RL = 2K, CC = OPEN RL = 2K, CC = OPEN RL = 2K, CC = OPEN Full temperature range 94 111 100 470 60 VS 10 300 470 1 50 dB MHz kHz V mA V/s pF s Full temperature range .5 15 10 75 200 4 50 1011 4 98 1 2 50 25 2000 500 mV V/C V/V V/kh pA pA/V pA pF V dB Vrms TEST CONDITIONS 1 MIN TYP MAX UNITS
VCM = 90V 100KHz BW, RS = 1K, CC = OPEN
VS 15 80
NOTES: 1. 2. 3. 4. 5.
Unless otherwise noted: TC = 25C, DC input specifications are value given. Power supply voltage is typical rating. RC = 100 CC = 68pF. 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 25C case. No derating needed above 25C case. The PA90 is constructed from MOSFET transistors. ESD handling procedures must be observed.
CAUTION
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
52
VS 12 200
TYPICAL PERFORMANCE GRAPHS
PA90
PHASE RESPONSE
90
INTERNAL POWER DISSIPATION, P(W)
40 32 24 16 8 0 0
POWER DERATING
NORMALIZED QUIESCENT CURRENT, I Q (X)
NORMALIZED QUIES. CURRENT
1.3
135
PHASE, ()
1.2
180 Cc = 68 pF Cc = 10 pF Cc = 4.7 pF Cc = OPEN 1M 10M FREQUENCY F (Hz)
1.1
225
25 50 75 100 125 150 CASE TEMPERATURE, T C (C)
270 100k
1.0 25
75 125 50 100 CASE TEMPERATURE, Tc (C)
SMALL SIGNAL RESPONSE
50
VOLTAGE DROP FROM SUPPLY, V S - VO (V)
OUTPUT VOLTAGE SWING
6 400
POWER RESPONSE
OUTPUT VOLTAGE, VO (V ) P-P
300
OPEN LOOP GAIN, A (dB)
40 30 20 10
5.5 5 4.5 4 3.5 0 0.15 .05 0.1 OUTPUT CURRENT, I O (A) 0.2
CC=
200
CC= 4.7p
OPE
CC=
CC=
N
10p
F
100 80 70 60 50
F
68p
Cc = 68 pF 0 Cc = 10 pF Cc = 4.7 pF -10 Cc = OPEN 100K 1M 10M FREQUENCY, F (Hz)
10K
1M 100K FREQUENCY, F (Hz)
F
1K 700 500
1 RL = 1K VS = 200V A V = 63 .1
PO = 17.6W
INPUT NOISE VOLTAGE, VN (nV Hz)
SLEW RATE
HARMONIC DISTORTION
20 15 10 7 5
INPUT NOISE VOLTAGE
SLEW RATE, (V/ S)
100 70 50 40 30 20 10 1 10 100 0.1 EXT. COMPENSATION CAPACITOR, C C (pF)
DISTORTION, (%)
300 200
.01
PO = 1W PO = 5W
3 2 10
.001 10
100 1K 10K FREQUENCY, F (Hz)
100K
100 1K 10K FREQUENCY, F (Hz)
100K
CURRENT LIMIT
.2
CURRENT LIMIT, IILIM (A)
.15
.1
.05
0 0 8 12 16 20 24 4 RESISTOR VALUE, R CL ( )
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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PA90
GENERAL
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.
OPERATING CONSIDERATIONS
INPUT PROTECTION
Although the PA90 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 32 ohms. .65 RCL = ILIM
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.
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.
STABILITY
The PA90 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.
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.
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.
500 OUTPUT CURRENT FROM +VS OR -VS, (mA) 300 200
DC
20
0m
S
DC ,T
10
0m
S
+VS Z1
C
=
100
DC ,T
,T
25
C
-IN Q1 Q2 +IN Q3 PA90 Q4 2 7, 8 Z2 -VS 1 11, 12 6
C
=
85
C
50 30 20
C
=
12
5
C
FIGURE 2. OVERVOLTAGE PROTECTION
10 25
PULSE CURVES @ 10% DUTY CYCLE MAX 50 75 100 125 250 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
This data sheet has been carefully CORPORATION * 5980 NORTH SHANNON ROAD is assumed for possible inaccuracies * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 APEX MICROTECHNOLOGY checked and is believed to be reliable, however, no responsibility* TUCSON, ARIZONA 85741 or omissions. All specifications are subject to change without notice.
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PA90U REV. A NOVEMBER 1998 (c) 1998 Apex Microtechnology Corp.

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