Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

PA84S Datasheet(PDF) 4 Page - Cirrus Logic

Part # PA84S
Description  POWER OPERATIONAL AMPLIFIERS
Download  4 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  APEX [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo APEX - Cirrus Logic

PA84S Datasheet(HTML) 4 Page - Cirrus Logic

  PA84S Datasheet HTML 1Page - Cirrus Logic PA84S Datasheet HTML 2Page - Cirrus Logic PA84S Datasheet HTML 3Page - Cirrus Logic PA84S Datasheet HTML 4Page - Cirrus Logic  
Zoom Inzoom in Zoom Outzoom out
 4 / 4 page
background image
OPERATING
CONSIDERATIONS
PA84 • PA84A • PA84S
GENERAL
Please read the “General Operating Considerations” sec-
tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta-
tion. 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.
SAFE OPERATING AREA (SOA)
The bipolar output stage of this high voltage operational
amplifier has two output limitations:
1. The internal current limit which limits maximum available
output current.
2. The second breakdown effect, which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts:
1. The following capacitive and inductive loads are safe:
±V
S
C(MAX)
L(MAX)
150V
1.2
µF
.7H
125V
6.0
µF
25H
100V
12
µF
90H
75V
ALL
ALL
2. Short circuits to ground are safe with dual supplies up to
±150V or single supplies up to 150V.
3. Short circuits to the supply rails are safe with total supply
voltages up to 150V (i.e.
±75V).
OUTPUT PROTECTION
Two external diodes as shown in Figure 2, are required to
protect these amplifiers against flyback (kickback) pulses
exceeding the supply voltages of the amplifier when driving
inductive loads.
For component selection, these external
diodes must be very quick, such as ultra fast recovery diodes
with no more than 200 nanoseconds of reverse recovery time.
STABILITY
Due to its large bandwidth the PA84 is more likely to oscillate
than lower bandwidth Power Operational Amplifiers such as
the PA83 or PA08. To prevent oscillations, a reasonable phase
margin must be maintained by:
1. Selection of the proper phase compensation capacitor and
resistor. Use the values given in the table under external
connections and interpolate if necessary. The phase mar-
gin can be increased by using a large capacitor and a
smaller resistor than the slew rate optimized values listed in
the table. The compensation capacitor may be connected to
common (in lieu of +V
S) if the positive supply is properly
bypassed to common. Because the voltage at pin 8 is only
a few volts below the positive supply, this ground connec-
tion requires the use of a high voltage capacitor.
2. Keeping the external sumpoint stray capacitance to ground
at a minimum and the sumpoint load resistance (input and
feedback resistors in parallel) below 500
Ω. Larger sumpoint
load resistance can be used with increased phase compen-
sation (see 1 above).
3. Connecting the amplifier case to a local AC common thus
preventing it from acting as an antenna.
+VS
–VS
FIGURE 1. PROTECTIVE,
INDUCTIVE LOAD
20
30
40
50
25
35
300
200
250
150
170
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
t =
5ms
t =
1ms
SAFE OPERATING AREA CURVES
STEADY
STATE
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.
PA84U REV. L JANUARY 2000
© 2000 Apex Microtechnology Corp.
Be sure the diode voltage rating is greater than the total of both
supplies. The diode will turn on to divert the flyback energy into
the supply rails thus protecting the output transistors from
destruction due to reverse bias.
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a
transient will be superimposed on the supply voltage, the
magnitude of the transient being a function of its transient
impedance and current sinking capability. If the supply voltage
plus transient exceeds the maximum supply rating or if the AC
impedance of the supply is unknown, it is best to clamp the
output and the supply with a zener diode to absorb the
transient.


Similar Part No. - PA84S

ManufacturerPart #DatasheetDescription
logo
Cirrus Logic
PA84S CIRRUS-PA84S Datasheet
210Kb / 5P
   Power Operational Amplifiers
More results

Similar Description - PA84S

ManufacturerPart #DatasheetDescription
logo
Cirrus Logic
PA02 APEX-PA02 Datasheet
262Kb / 4P
   POWER OPERATIONAL AMPLIFIERS
logo
Fairchild Semiconductor
UA759 FAIRCHILD-UA759 Datasheet
489Kb / 12P
   POWER OPERATIONAL AMPLIFIERS
logo
List of Unclassifed Man...
PA34 ETC-PA34 Datasheet
66Kb / 5P
   POWER OPERATIONAL AMPLIFIERS
logo
Cirrus Logic
PA79 APEX-PA79 Datasheet
310Kb / 4P
   POWER OPERATIONAL AMPLIFIERS
PA84 CIRRUS-PA84 Datasheet
210Kb / 5P
   Power Operational Amplifiers
PA97DR_0912 CIRRUS-PA97DR_0912 Datasheet
582Kb / 6P
   Power Operational Amplifiers
PA16 CIRRUS-PA16_09 Datasheet
349Kb / 7P
   Power Operational Amplifiers
PA162 APEX-PA162_10 Datasheet
789Kb / 6P
   Power Operational Amplifiers
PA107DP CIRRUS-PA107DP_10 Datasheet
892Kb / 7P
   Power Operational Amplifiers
PA61 CIRRUS-PA61 Datasheet
340Kb / 5P
   POWER OPERATIONAL AMPLIFIERS
PA03 CIRRUS-PA03 Datasheet
207Kb / 5P
   Power Operational Amplifiers
More results


Html Pages

1 2 3 4


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com