PA91 查看數據表（PDF） - Cirrus Logic
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PA91 Datasheet PDF : 6 Pages
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30
20
10
CC = 68 pF
0 CC = 10 pF
PA91 CC = 4.7 pF
–10 CC = OPEN
100K
1M
10M
FREQUENCY, F (Hz)
SLEW RATE
1K
700
500
300
200
100
70
50
40
30
20
10
0.1
1
10
100
EXT. COMPENSATION CAPACITOR, CC (pF)
CURRENT LIMIT
.2
.15
.1
.05
0
0 4 8 12 16 20 24
RESISTOR VALUE, RCL (Ω)
5
200
4.5
4
®
Product Innovation From
3.5
0
.05
0.1
0.15 0.2
OUTPUT CURRENT, IO (A)
HARMONIC DISTORTION
1
RL = 1KΩ
VS = 200V
AV = 63
.1
PO = 17.6W
.01 PO = 1W
PO = 5W
.001
10
100
1K
10K
FREQUENCY, F (Hz)
100K
100
90
80
70
60
50
10K
100K
1M
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE
20
15
10
7
5
3
2
10
100
1K
10K 100K
FREQUENCY, F (Hz)
PHASE COMPENSATION
GAIN
≥1
CC*
68pF
RC
100Ω
≥5
10pF
100Ω
≥10
4.7pF
0Ω
≥30
NONE
0Ω
*CC To be rated for the full supply voltage +VS to –VS.
Use NPO ceramic (COG) type.
TYPICAL APPLICATION
LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of seg-
mented mirror systems. The composite mirror may be
composed of hundreds of elements, each requiring focus-
ing under computer control. In such complex systems the
PA91 reduces the costs of power supplies and cooling
with its advantages of low cost and low quiescent power
consumption while increasing circuit density with the SIP
package.
R IN
COMPUTER
FOCUS
COMMAND
VOLTAGE
RF
+VS
1 11,12
PA91
6
2
9,10
7,8
R CL
PIEZO DRIVE
V OUT
GENERAL
–V S
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification interpretation. Visit www.cirrus.com for design tools
that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selec-
tion; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection dia-
gram. For optimum reliability the resistor value should be set as high as possible. The value is calculated as follows;
with the maximum practical value of 32 ohms.
RCL = .IL6I M5
4
PA91U
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