PA97DR - Apex Microtechnology
PA97DR
PA97DR
PA97DR
Power Operational Amplifiers
FEATURES
DESCRIPTION
• HIGH VOLTAGE — 900V (±450V)
• LOW QUIESCENT CURRENT — 600µA
• HIGH OUTPUT CURRENT — 10mA APPLICATIONS
• MASS SPECTROMETERS
• SCANNING COILS
• HIGH VOLTAGE INSTRUMENTATION
• PROGRAMMABLE POWER SUPPLIES UP
TO 880V
• SEMICONDUCTOR MEASUREMENT EQUIPMENT
The PA97DR is a high voltage MOSFET operational
amplifier designed as a low cost solution for driving
continuous output currents up to 10mA and pulse currents to 15mA into capacitive loads. The safe operating
area (SOA) has no second breakdown limitations. The
MOSFET output stage is biased class C for low quiescent current operation. External compensation provides flexibility in choosing bandwidth and slew rate for
the application. Apex Microtechnology’s SIP05 package uses a minimum of board space allowing for high
density circuit boards.
EQUIVALENT SCHEMATIC
12
+VS
R1
C1
R2
Q1
Q3
Q2
Q6
4
CC1
Q5
Q10A
1
–IN
Q4
6
CC2
OUT
8
R10
2
+IN
R9
R14
Q14
www.apexanalog.com
PA97DRU
R5
Q10B
R7
R8
–VS
10
R4
R16
Q12
Q15
R18
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
OCT 2012
1
PA97U REVI
PA97DR
CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +VS to -VS
900
V
OUTPUT CURRENT, source, sink, within SOA
15
mA
POWER DISSIPATION,continuous @ TC = 25ºC
5
W
INPUT VOLTAGE, differential (Note 3)
-20
20
V
INPUT VOLTAGE, common mode (See Text)
-VS
VS
V
220
°C
TEMPERATURE, pin solder, 10s max.
TEMPERATURE, junction (Note 2)
150
°C
TEMPERATURE RANGE, storage
−65
150
°C
OPERATING TEMPERATURE, case
−55
125
°C
SPECIFICATIONS
Parameter
Test Conditions
Min
Typ
Max
Units
0.5
5
mV
10
50
µV/°C
OFFSET VOLTAGE vs. supply
10
25
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE vs. temperature
Full temperature range
BIAS CURRENT vs. supply
4
OFFSET CURRENT, initial
50
INPUT IMPEDANCE, DC
10
INPUT CAPACITANCE
11
4
COMMON MODE VOLTAGE RANGE
V =±250V
(Note 3) S
COMMON MODE REJECTION, DC
VCM = ±90V
NOISE
10KHz BW, RS = 1KΩ,
CC = 10pF
±VS Ŧ 30
80
µV/V
µV/kHz
2000
pA
pA/V
500
pA
Ω
pF
V
98
dB
2
µVRMS
111
dB
GAIN
OPEN LOOP @ 15Hz
RL = 5KΩ, CC = 10pF
94
GAIN BANDWIDTH PRODUCT @ 1MHz
RL = 5KΩ, CC = 10pF
1
MHz
POWER BANDWIDTH
RL = 5KΩ, CC = 10pF
2
kHz
PHASE MARGIN, AV = 100
Full temperature range
60
°
±VS Ŧ 20
V
OUTPUT
VOLTAGE SWING (Note 3) IO = 10mA
CURRENT, continuous
±VS Ŧ 24
10
mA
SLEW RATE, AV = 100
CC = 10pF
8
V/µS
SETTLING TIME, to 0.1%
CC = 10pF, 2V step
2
µS
RESISTANCE
10mA Load
100
Ω
2
PA97DRU
PA97DR
Parameter
Test Conditions
Min
Typ
Max
Units
±50
±300
±450
V
0.6
1
mA
20
ºC/W
25
ºC/W
POWER SUPPLY
VOLTAGE (Note 5)
CURRENT, quiescent, amplifier only
THERMAL
RESISTANCE, AC, junction to case (Note 4)
Full temp range, F > 60Hz
RESISTANCE, DC, junction to case
Full temp range, F < 60Hz
RESISTANCE, junction to air
Full temp range
40
TEMPERATURE RANGE, case
–25
ºC/W
+85
ºC
NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage
is typical rating. CC = 10pF.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
internal power dissipation to achieve high MTTF.
3. 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.
4. Rating applies if the output current alternates between both output transistors at a rate faster than
60Hz.
5. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.
1
-200
0
25 50 75 100 125 150
TEMPERATURE, T (°C)
SMALL SIGNAL RESPONSE
120
100
C
80
C
=
10
pF
60
40
20
0
1
M +VS OR –VS, (mA)
-180
20
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
SAFE OPERATING AREA
PA97DRU
10
DC
DC
,T
C
0µ
S
=2
5
-220
.6M
14
1M
2M
FREQUENCY, F (Hz)
3M
OUTPUT VOLTAGE SWING
SWING FROM +VS
13
12
11
10
SWING FROM -VS
9
0
2
4
6
8
10
OUTPUT CURRENT, IO (mA)
1.08
QUIESCENT CURRENT
1.04
1.00
0.96
0.92
0.88
100 200 300 400 500 600 700 800 900
TOTAL SUPPLY VOLTAGE, VS (V)
1K
OUTPUT VOLTAGE, VO (VP-P)
PHASE, Ф (°)
T = TA
2
-160
NORMALIZED QUIESCENT CURRENT, I (X)
-140
T = TC
3
10
8
-120
POWER RESPONSE
500
200
CC = 10pF
100
50
1K
, VN (nV/√Hz)
4
0
PHASE RESPONSE
POWER DERATING
5
140
OPEN LOOP GAIN, A (dB)
The PA97DR is constructed from MOSFET transistors. ESD handling procedures must be observed.
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
INTERNAL POWER DISSIPATION, P(W)
CAUTION
20
15
10
10K
FREQUENCY, F (Hz)
30K
INPUT NOISE
3
=
C
10
pF
60
40
PA97DR
20
20
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
12
11
10
SWING FROM -VS
9
0
2
4
6
8
10
OUTPUT CURRENT, IO (mA)
SAFE OPERATING AREA
10
8
6
5
4
3
0µ
C
DC
,T
C
=1
25
°
50
1K
10K
FREQUENCY, F (Hz)
30K
INPUT NOISE
15
S
DC =2
5°
,T
C
C=
85
°C
,T
100
20
10
DC
CC = 10pF
200
INPUT NOISE VOLTAGE, VN (nV/√Hz)
OUTPUT CURRENT FROM +VS OR –VS, (mA)
0
1
OUTPUT VOLTAGE,
C
80
VOLTAGE DROP FROM SUPP
OPEN LOOP GAIN,
100
10
C
2
CC =10pF
1
200 300 400 600
100
1000
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
1M
EXTERNAL CONNECTIONS
–IN
+IN
CC1
CC2
OUT
–Vs
+Vs
1
2
4
6
8
10
12
*
*
CC*
PATENTED
* 0.01µF or greater ceramic power supply bypassing
required. CC = 10pF minimum, 1kV NPO (COG).
7-pin SIP
PACKAGE STYLE DR
PHASE COMPENSATION
GAIN
CC
≥10
10pF
TYPICAL APPLICATION
RF
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 PA97DR
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.
+VS
R IN
1
12
PIEZO DRIVE
PA97DR
2
COMPUTER
FOCUS
COMMAND
VOLTAGE
8
6
V OUT
4
10
CC
–V S
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.
CURRENT LIMIT
The PA97DR has no provision for current limiting the output.
4
PA97DRU
PA97DR
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 PA97DR is restricted. The input pins must always be a
least 30V from either supply voltage but never more than 500V. This means that the PA97 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.
INPUT PROTECTION
Although the PA97DR 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 2a). 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 2b). 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.
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 A.
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.
EXTERNAL COMPONENTS
The compensation capacitor Cc must be rated for the total supply voltage. 10pF NPO (COG)capacitor rated at 1kV is recommended.
Of equal importance is 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 900 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
+VS
Z1
1
–IN
D1
+IN
D2
2
12
PA97DR
10
Z2
–VS
B.
+VS
Z1
1
–IN
Q1
+IN
Q2
2
12
PA97DR
10
Z2
–VS
FIGURE 2.
The operating voltages of the PA97DR 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. With no internal current limit, proper choice of load impedance and supply voltage is required to meed SOA limitiations. An output short circuit will destroy the amplifier within milliseconds.
STABILITY
The PA97DR is stable at gains of 10 or more with a NPO (COG) compensation capacitor of 10pF. 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 10pF is not recommended.
PA97DRU
5
PA97DR
NEED TECHNICAL HELP? CONTACT APEX SUPPORT!
For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Apex Microtechnology Sales Representative.
To find 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 specifications 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.
www.apexanalog.com
6
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
OCT 2012
PA97DRU
PA97U REVI
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement