View PA95_414936.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA95
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * HIGH VOLTAGE -- 900V (450V) LOW QUIESCENT CURRENT -- 1.6mA HIGH OUTPUT CURRENT -- 100mA PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
* * * * HIGH VOLTAGE INSTRUMENTATION PROGRAMMABLE POWER SUPPLIES UP TO 430V MASS SPECTROMETERS SEMICONDUCTOR MEASUREMENT EQUIPMENT
PATENT PENDING
DESCRIPTION
The PA95 is a high voltage, MOSFET operational amplifier designed as a low cost solution for driving continuous output currents up to 100mA and pulse currents up to 200mA into capacitive loads. The safe operating area (SOA) has no second breakdown limitations and can be observed for all load types 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 SIP04 package uses a minimum of board space allowing for high density circuit boards.
TYPICAL APPLICATION
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 PA95 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.
RF +VS
EQUIVALENT SCHEMATIC
12 +VS R1 R2 C1 R3
R IN 1
12 PIEZO DRIVE PA95 7 V OUT
Q1 Q6 Q5
Q2 6 CC2
Q3 R4 Q4 ILIM 8 Q8 Q11 R7 7 OUT Q12 Q13
COMPUTER FOCUS COMMAND VOLTAGE
2 8 10 R CL
4 CC1
-V S
1 -IN
EXTERNAL CONNECTIONS
-IN
1
PACKAGE SIP04
R5 R8 R9
R6
+IN
2
CC1
4
CC2 OUT Ilim
6 7 8
-Vs
10
+Vs
12
2 +IN Q15 R11 -VS 10 R12 Q16
Q14 R10
Cc
RLIM
*
*
* .01F or greater ceramic power supply bypassing required.
PHASE COMPENSATION GAIN 10 CC 4.7pF
R LIM = .7 ILIM
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA95
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, source, sink POWER DISSIPATION, continuous @ TC = 25C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode3 TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
900V 200mA, 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,Av=10 OUTPUT VOLTAGE SWING CURRENT, continuous SLEW RATE, AV = 100 SETTLING TIME to .1% RESISTANCE POWER SUPPLY VOLTAGE 5 CURRENT, quiescent THERMAL RESISTANCE, AC, junction to case 4 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range -25 2.5 4.2 30 +85 C/W C/W C/W C See note 5 50 300 1.6 450 2.2 V mA IO = 100mA CC =4.7pF 2V step no load RL = 5K RL = 5K RL = 5K Full temperature range 94 118 10 20 60 VS 20 30 1 100 dB MHz kHz V mA V/s s Full temperature range .5 15 10 75 200 4 50 1011 4 98 2 5 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
Vs=250V SEE NOTE 3 VCM = 90V 10KHz BW, RS = 1K
VS 30 80
NOTES: 1. 2. 3. 4. 5.
Unless otherwise noted: TC = 25C, DC input specifications are value given. Power supply voltage is typical rating. Cc= 4.7pF. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. Although supply voltages can range up to 450V the input pins cannot swing over this range. The input pins must be at least 30V from either supply rail but not more than 500V from either supply rail. See text for a more complete description of the common mode voltage range. 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.
CAUTION
The PA95 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
VS 24 100
TYPICAL PERFORMANCE GRAPHS
PA95
PHASE RESPONSE
-90 -135 1.08
INTERNAL POWER DISSIPATION, P(W)
30 25
POWER DERATING
QUIESCENT CURRENT
QUIESCENT CURRENT, I(X)
T = TC
1.04 1.00
PHASE, ()
20 15 10 5 0 0 25 50 75 100 125 TEMPERATURE, T (C) 150 T = TA
-180 C = 4.7pF -225 -270 -315 -360 1M
.96 .92 .88 0
2M 3M 4M 5M FREQUENCY, F (Hz)
200 800 1000 400 600 TOTAL SUPPLY VOLTAGE, VS (V)
VOLTAGE DROP FROM SUPPLY, V S - VO (V)
SMALL SIGNAL RESPONSE
120
24 20 16
OUTPUT VOLTAGE SWING
1K
C 85
POWER RESPONSE
OUTPUT VOLTAGE, VO (V ) P-P
OPEN LOOP GAIN, A (dB)
12
100 80 C C = 4.7pF 60 40 20 0 10 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz)
5 C
T
TC
=
500
C
=
T C=
25
C
C C= 4.7pF
12
TC = -55C
200
8 4 0 100 20 40 80 60 OUTPUT CURRENT, I O (mA)
100
50 10K
100K FREQUENCY, F (Hz)
300K
CURRENT LIMIT
200
OUTPUT CURRENT FROM +VS OR -VS, (mA)
INPUT NOISE VOLTAGE, VN (nV/Hz)
250 150 100 50
SAFE OPERATING AREA
0m S 0m S
= 25 C
20
INPUT NOISE
CURRENT LIMIT, I LIM (mA)
120 100 70 50 30 20 10 50 100 150 35 10 20 CURRENT LIMIT RESISTOR, RCL ( )
10
15 10 7 5
DC
DC ,T
20
C
DC
25 15 10
,T
C
,T
=
85
C
=
C
12
5 C
3
5 2 100 50 200 500 1K 10 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
PULSE CURVES @ 10% DUTY CYCLE MAX
100 1K 10K FREQUENCY, F (Hz)
1M
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PA95
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
CURRENT LIMIT
For proper operation, the current limit resistor (RLIM) 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 RLIM = ILIM
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 amplifier as possible.
STABILITY
The PA95 is stable at gains of 10 or more with a NPO (COG) compensation capacitor of 4.7pF. The compensation capacitor, Cc, in the external connections diagram must be rated at 1000V working voltage and mounted closely to pins 4 and 6 to prevent spurious oscillation. A compensation capacitor less than 4.7pF is not recommended.
COMMON MODE INPUT RANGE
Operational amplifiers are usually designed to have a common mode input voltage range that approximates the power supply voltage range. However, to keep the cost as low as possible and still meet the requirements of most applications the common mode input voltage range of the PA95 is restricted. The input pins must always be a least 30V from either supply voltage but never more than 500V. This means that the PA95 cannot be used in applications where the supply voltages are extremely unbalanced. For example, supply voltages of +800V and -100V would not be allowed in an application where the non-inverting pin is grounded because in normal operation both input pins would be at 0V and the difference voltage between the positive supply and the input pins would be 800V. In this kind of application, however, supply voltages +500V and -100V does meet the input common mode voltage range requirements since the maximum difference voltage between the inputs pins and the supply voltage is 500V (the maximum allowed). The output has no such restrictions on its voltage swing. The output can swing within 24V of either supply voltage regardless of value so long as the total supply voltage does not exceed 900V.
EXTERNAL COMPONENTS
The compensation capacitor Cc must be rated for the total supply voltage. An NPO (COG)capacitor rated a 1kV is recommended. Of equal importance are the voltage rating and voltage coefficient of the gain setting feedback resistor. Typical voltage ratings of low wattage resistors are 150 to 250V. Up to 500 V can appear across the feedback resistor. High voltage rated resistors can be obtained. However a 1 megohm feedback resistor composed of five 200k resistors in series will produce the proper voltage rating.
CAUTIONS
The operating voltages of the PA95 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.
A. +VS Z1 12 PA95 10 +VS Z2 -VS B. -IN Q1 +IN 1 Q2 2 12 PA95 10 Z2
FIGURE 1. OVERVOLTAGE PROTECTION
INPUT PROTECTION
Although the PA95 can withstand differential input voltages up to 20V, additional external protection is recommended. In most applications 1N4148 or 1N914 signal diodes are sufficient (D1, D2 in Figure 1a). In more demanding applications where low leakage or low capacitance are of concern 2N4416 or 2N5457-2N5459 JFETs connected as diodes will be required (Q1, Q2 in Figure 1b). In either case the input differential voltage will be clamped to .7V. This is sufficient overdrive to produce maximum power bandwidth. Note that this protection does not automatically protect the amplifier from excessive common mode input voltages.
-IN D1 +IN
1 D2 2
Z1
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The zeners clamp
-VS
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. PA95U REV. B DECEMBER 1999 (c) 1999 Apex Microtechnology Corp.

▲Up To Search▲

Price & Availability of PA95

	To Download PA95 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .