參數(shù)資料
型號： PA94
英文描述： Operational Amplifier
中文描述： 運(yùn)算放大器
文件頁數(shù)： 3/4頁
文件大?。?/td> 70K
代理商： PA94
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600
FAX (520) 888-3329
ORDERS (520) 690-8601
EMAIL prodlit@apexmicrotech.com
TYPICAL PERFORMANCE
GRAPHS
PA94
With the unique combination of high voltage and speed of the PA94,
traditional formulas for heatsink selection will falsely lower the apparent power
handling capability of this amplifier. To more accurately predict operating
temperatures use Power Design
1
revision 10 or higher, or use the following
procedure:
Find internal dissipation (PD) resulting from driving the load. Use Power
Design or refer to Apex Applications Note 1, General Operating Considertaions,
paragraph 7. Find total quiescent power (PD
) by multiplying 0.024A by V
(total
supply voltage). Find output stage quiescent power (PD
QOUT
) by multiplying
0.00012 by V
.
Calculate a heatsink rating which will maintain the case at 85
°
C or lower.
INTERNAL POWER DISSIPATION
AND HEATSINK SELECTION
Where: T
C
= maximum case temperature allowed
T
A
= maximum ambient temperature encountered
Calculate a heatsink rating which will maintain output transistor junctions at
150
°
C or lower.
T
J
- Ta - (PD + PD
QOUT
) *R
JC
PD + PD
Q
Where: T
= maximum junction temperature allowed.
R
= AC or DC thermal resistance from the specification table.
Use the larger heatsink of these two calculations.
Power Design is an Excel spreadsheet available free from
www.apexmicrotech.com
R
SA
=
Tc - Ta
PD + PD
Q
- 0.1
°
C/W
R
SA
=
-0.1
°
C/W
0
25
TEMPERATURE, T (
°
C)
50
75
100
125
150
0
5
15
20
POWER DERATING
I
10
100
FREQUENCY, F (Hz)
10K
1M
0
100
OUTPUT CURRENT, I (mA)
4
8
16
24
OUTPUT VOLTAGE SWING
12
20
3
10
20
100
CURRENT LIMIT RESISTOR, R
CL
( )
10
30
200
CURRENT LIMIT
C
L
50
70
5
50
20
INPUT NOISE
1K
2
7
10
20
3
5
15
20
V
–
S
O
10
30
60
25
40
120
100
150
T = 25
°
C
C
T =
–
55
°
C
T =125
°
C
C
T =85
°
C
C
80
T = T
C
T = T
A
SAFE OPERATING AREA
SUPPLY TO OUTPUT DIFFERENTIAL, VS
–
VO (V)
50
50
O
–
V
5
10
15
25
DC T
C
=125
°
C
DC T
C
=85
°
C
PULSE CURVES @ 10% DUTY CYCLE MAX
100
200
DC T
C
=25
°
C
100mS
100
150
250
500
1K
0
200
600
800
1000
TOTAL SUPPLY VOLTAGE, V (V)
1.08
1.04
1.00
.96
.92
.88
QUIESCENT CURRENT
Q
400
I
N
√
H
1M
20M
10M
FREQUENCY, F (Hz)
-90
-120
-150
-180
-210
-240
PHASE RESPONSE
P
φ
(
°
)
POWER RESPONSE
100K
1M 2M
FREQUENCY, F (Hz)
10K
50
1K
500
O
O
P
100
200
FREQUENCY, F (Hz)
SMALL SIGNAL RESPONSE
O
0
60
120
20
40
80
100
10
100
1K
10K
1M
100K
20M
10M
C
C =
22 pF
C
C =
2.2pF
C
C =
4.7pF
C
C =
22 pF
C
C =
4.7pF
C
C =
2.2pF
C
C=
2p
C
C=
4p
C
C=
2p
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