PA95 Datasheet PDF - Cirrus Logic
| Part Number | PA95 | |
| Description | High Voltage Power Operational Amplifiers | |
| Manufacturers | Cirrus Logic | |
| Logo |  |
|
|
There is a preview and PA95 download ( pdf file ) link at the bottom of this page. Total 6 Pages | ||
Preview 1 page No Preview Available !
®
P r o d uPc tAI9n 5n o v a t i o n F r o m
PA95PA95www.DataSheet4U.com
High Voltage Power Operational Amplifiers
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
DESCRIPTION
The PA95 is a high voltage, MOSFET operational am-
plifier designed as a low cost solution for driving contin-
uous output currents up to 100mA and pulse currents
up to 200mA into capacitive loads. The safe operat-
ing 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. Exter-
nal compensation provides flexibility in choosing band-
width and slew rate for the application. Apex Precision
Power’s Power SIP package uses a minimum of board
space allowing for high density circuit boards. The
Power SIP package is electrically isolated. Isolating
thermal washers (TW13) are recommended to prevent
arcing from pins to heatsink.
EQUIVALENT SCHEMATIC
12
+VS R1A
R1B
C2
R3
Q1 Q2
Q6
Q5
Q5A
1
–IN R9
R11
6
4 CC2
CC1
Q5B
R10
R12
Q3
Q8
Q14
Q21
Q29
R4
R7
Q4
ILIM
8
7
OUT
2
+IN
Q29
Q14
R19
Q30
R20
–VS
10
EXTERNAL CONNECTIONS
–IN +IN
12
CC1
4
CC2 OUT ILIM
6 78
CC RLIM
–Vs
10
*
+Vs
12
*
* 0.01µF or greater ceramic power supply bypassing required.
R27
PATENTED
8-pin SIP
PACKAGE
STYLE DQ
Formed leads available
See package style EC
PA95wUww.cirrus.com
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
APEX − PAM95AURR2E0V1L01
|
| |
 
®
Product Innovation From
PA95www.DataSheet4U.com
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 PA95 can withstand differential input voltages up to
±20V, additional external protection is recommended. In most ap-
A.
+VS
Z1
plications 1N4148 or 1N914 signal diodes are sufficient (D1, D2 in
Figure 1a). In more demanding applications where low leakage or –IN
1 12
low capacitance are of concern 2N4416 or 2N5457-2N5459 JFETs D1
D2 PA95
connected as diodes will be required (Q1, Q2 in Figure 1b). In +IN
either case the input differential voltage will be clamped to ±.7V.
2 10
This is sufficient overdrive to produce maximum power bandwidth.
Note that this protection does not automatically protect the ampli-
fier from excessive common mode input voltages.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommend-
Z2
–VS
B. –IN
Q1
+VS
Z1
1 12
Q2 PA95
ed as protection on the supply pins. The zeners clamp transients
to voltages within the power supply rating and also clamp power
+IN
2 10
supply reversals to ground. Whether the zeners are used or not,
Z2
the system power supply should be evaluated for transient perfor-
–VS
mance including power-on overshoot and power-off polarity rever-
sal as well as line regulation.
FIGURE 1. OVERVOLTAGE PROTECTION
Conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or pro-
tected 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.
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 volt-
age 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.
PA95U
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for PA95 electronic component. |
| Information | Total 6 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ PA95.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| PA90 | The function is High Voltage Power Operational Amplifiers. Cirrus Logic | |
| PA905C4 | The function is LOW LOSS SUPER HIGH SPEED RECTIFIER. Fuji Electric |  |
| PA905C6 | The function is LOW LOSS SUPER HIGH SPEED RECTIFIER. Fuji Electric | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
PA95
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||