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| 型号： | PA61A |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 运算放大器 |
| 英文描述： | POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 功耗运算放大器 |
| 文件页数： | 4/4页 |
| 文件大小： | 64K |
| 代理商： | PA61A |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD
TUCSON, ARIZONA 85741
USA
APPLICATIONS HOTLINE: 1 (800) 546-2739
OPERATING
CONSIDERATIONS
PA61
PA61A
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 3 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 all limits for this Power
Op Amp. 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. The following guidelines may save extensive analytical
efforts.
1. Under transient conditions, capacitive and dynamic* induc-
tive loads up to the following maximum are safe:
CAPACITIVE LOAD
V
I
= 5A I
= 10A
45V 200 F 150 F
40V 400 F 200 F
35V 800 F 400 F
30V 1600 F 800 F
25V 5.0mF 2.5mF
20V 10mF 5.0mF
15V 20mF 10mF
INDUCTIVE LOAD
I
LIM
= 5A
8mH
11mH
20mH
35mH
50mH
400mH
**
I
LIM
= 10A
4.3mH
5.0mH
6.2mH
15mH
20mH
100mH
* If the inductive load is driven near steady state conditions,
allowing the output voltage to drop more than 8V below the
supply rail with I
= 10A or 15V below the supply rail with
I
= 5A while the amplifier is current limiting, the inductor
should be capacitively coupled or the current limit must be
lowered to meet SOA criteria.
** Second breakdown effect imposes no limitation but thermal
limitations must still be observed.
2. The amplifier can handle any EMF generating or reactive
load and short circuits to the supply rail or shorts to common
if the current limits are set as follows at T
C
=85
°
C.
SHORT TO V
±
C, L, OR EMF LOAD
0.1A
0.2A
0.3A
0.5A
1.2A
1.5A
2.0A
SHORT TO
COMMON
1.3A
1.5A
1.6A
2.0A
2.4A
3.0A
4.0A
±
V
S
45V
40V
35V
30V
25V
20V
15V
These simplified limits may be exceeded with further analy-
sis using the operating conditions for a specific application.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
PA61U REV. H JANUARY 2001
2001 Apex Microtechnology Corp.
Tc=125°C
Tc=85°C
Sead Sae
t=5m
t=1ms
t05m
10
20
30
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE V
S
–
V
O
(V)
SAFE OPERATING AREA (SOA)
I
S
–
V
S
40
50
60
70
90
80
.1
.2
.3
.4
.6
.8
1.0
2.0
1.5
3.0
4.0
6.0
10
Tc=25°C
25
15
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