- 您现在的位置：买卖IC网 > PDF目录367747 > PA10A (Electronic Theatre Controls, Inc.) POWER OPERATIONAL AMPLIFIERS PDF资料下载
参数资料
| 型号： | PA10A |
| 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： | 61K |
| 代理商： | PA10A |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD
TUCSON, ARIZONA 85741
USA
APPLICATIONS HOTLINE: 1 (800) 546-2739
PA10U REV. M FEBRURAY 2001
2001 Apex Microtechnology Corp.
OPERATING
CONSIDERATIONS
PA10
PA10A
GENERAL
Please read Application Note 1 "General Operating Consider-
ations" which covers stability, supplies, heat sinking, mounting,
current limit, SOA interpretation, and specification interpretation.
Visit www.apexmicrotech.com for design tools that help automate
tasks such as calculations for stability, internal power dissipation,
current limit; heat sink selection; Apex
’
s complete Application
Notes library; Technical Seminar Workbook; and Evaluation Kits.
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 DC outputs, especially those resulting from fault condi-
tions, check worst case stress levels against the new SOA
graph.
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. 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:
Tc = 125
THERMAL
seadysaeSECONDBREAKDOWN
t=1ms
t=5ms
.2
.3
.4
.6
.8
1.0
1.5
2.0
3.0
4.0
5.0
10
15
20
25
30 35 40
50
60 70 80
100
Tc = 85
°
C
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE V
S
–
V
O
(V)
O
S
–
S
SHORT TO
±
V
C, L, OR EMF LOAD
.21A
.3A
.36A
.46A
.61A
.87A
1.4A
SHORT TO
COMMON
.61A
.87A
1.0A
1.4A
1.7A
2.2A
2.9A
±
V
S
50V
40V
35V
30V
25V
20V
15V
CURRENT LIMITING
Refer to Application Note 9, "Current Limiting", for details of both
fixed and foldover current limit operation. Visit the Apex web site
at www.apexmicrotech.com for a copy of the Power Design
spreadsheet (Excel) which plots current limits vs. steady state
SOA. Beware that current limit should be thought of as a +/
–
20%
function initially and varies about 2:1 over the range of
–
55
°
C to
125
°
C.
For fixed current limit, leave pin 7 open and use equations 1 and 2.
R
CL
= 0.65/L
CL
I
CL
= 0.65/R
CL
Where:
I
CL
is the current limit in amperes.
R
CL
is the current limit resistor in ohms.
For certain applications, foldover current limit adds a slope to
the current limit which allows more power to be delivered to the
load without violating the SOA. For maximum foldover slope,
ground pin 7 and use equations 3 and 4.
(1)
(2)
0.65 + (Vo * 0.014)
I
CL
=
(3)
R
CL
0.65 + (Vo * 0.014)
R
CL
=
(4)
I
CL
Where:
Vo is the output voltage in volts.
Most designers start with either equation 1 to set R
CL
for the
desired current at 0v out, or with equation 4 to set R
at the
maximum output voltage. Equation 3 should then be used to plot
the resulting foldover limits on the SOA graph. If equation 3 results
in a negative current limit, foldover slope must be reduced. This
can happen when the output voltage is the opposite polarity of the
supply conducting the current.
In applications where a reduced foldover slope is desired, this
can be achieved by adding a resistor (R
) between pin 7 and
ground. Use equations 4 and 5 with this new resistor in the circuit.
0.65 + Vo
0.14
10.14 + R
FO
R
CL
I
CL
=
(5)
0.65 + Vo
*
0.14
10.14 + R
FO
R
CL
=
(6)
I
CL
Where:
R
FO
is in K ohms.
1
Note 1. Power Design is a self-extracting Excel spreadsheet
available free from www.apexmicrotech.com
相关PDF资料 |
PDF描述 |
|---|---|
| PA1110 | 1800-2000 MHz.Ultra Linear Power Amplifier |
| PA1131 | 850-900 MHz. Ultra Linear Amplifier |
| PA1132 | 1800-2000 MHz. Linear Power Amplifier |
| PA1133 | 1850-1910 MHz,Linear Power Amplifier |
| PA1137 | 2000-2200MHz.Linear Power Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PA-10A | 制造商:ADVANCEDPHOTONIX 制造商全称:ADVANCEDPHOTONIX 功能描述:A -18 dBm sensitivity receiver module |
| PA-10A14DGPO | 制造商:ADVANCEDPHOTONIX 制造商全称:ADVANCEDPHOTONIX 功能描述:A -18 dBm sensitivity receiver module |
| PA-10A14SMA | 制造商:ADVANCEDPHOTONIX 制造商全称:ADVANCEDPHOTONIX 功能描述:A -18 dBm sensitivity receiver module |
| PA-10AFC | 制造商:ADVANCEDPHOTONIX 制造商全称:ADVANCEDPHOTONIX 功能描述:A -18 dBm sensitivity receiver module |
| PA10A-S | 功能描述:运算放大器 - 运放 Linear Op Amp 90V 5A Custom RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。