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參數(shù)資料
| 型號(hào)： | PA01 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 功耗運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 4/4頁(yè) |
| 文件大?。?/td> | 60K |
| 代理商： | PA01 |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD
TUCSON, ARIZONA 85741
USA
APPLICATIONS HOTLINE: 1 (800) 546-2739
OPERATING
CONSIDERATIONS
PA01
PA73
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. Visit www.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit and heat sink selection. The
"Application Notes" and "Technical Seminar" sections contain
a wealth of information on specific types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For the
most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
SAFE OPERATING AREA (SOA)
The output stage of most power amplifiers has three distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
3. The junction temperature of the output transistors.
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.
1. For sine wave outputs, use Power Design
1
to plot a load line.
Make sure the load line does not cross the 0.5ms limit and
that excursions beyond any other second breakdown line
do not exceed the time label, and have a duty cycle of no
more than 10%.
For other waveform outputs, manual load line plotting is
recommended. Applications Note 22, SOA AND LOAD
LINES, will be helpful. A Spice type analysis can be very
useful in that a hardware setup often calls for instruments or
amplifiers with wide common mode rejection ranges.
2. EMF generating or reactive load and short circuits to the
supply rail or shorts to common are safe if the current limits
are set as follows at T
C
= 85
°
C.
SHORT TO
±
V
±
V
S
C, L, OR EMF LOAD
34V
.58A
30V
.46A
25V
.61A
20V
.86A
15V
1.3A
SHORT TO
COMMON
1.1A
1.4A
1.7A
2.1A
2.9A
3. The output stage is protected against occaisional transient
flyback. However, for protection against sustained, high
energy flyback, external fast-recovery diodes should be
used.
CURRENT LIMIT
Proper operation requires the use of two current limit resis-
tors, connected as shown, in the external connection diagram.
The minimum value for R
is 0.12 ohm; however, for optimum
reliability it should be set as high as possible. Refer to the
“
General Operating Considerations
”
section of the handbook
for current limit adjust details.
10
15
20
25
30 35 40
50
60
.3
.4
.6
.8
1.0
1.5
2.0
3.0
4.0
5.0
Tc = 85
°
C
Tc = 125
THERMAL
seadysaeSECONDBREAKDOWN
t=1ms
t=5ms
PA01 LIMIT
1
Note 1. Power Design is a self-extracting Excel spreadsheet
available free from www.apexmicrotech.com
PA01, 73U REV. O FEBRUARY 2001
2001 Apex Microtechnology Corp.
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