PA98A Datasheet PDF - Cirrus Logic
| Part Number | PA98A | |
| Description | Power Operational Amplifiers | |
| Manufacturers | Cirrus Logic | |
| Logo |  |
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PP rAo d9u8c ,t PI nAn o9v8aAt i o n F r o m
PA98 • PA98APA98ww•w.PDaAta9Sh8eAet4U.com
Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 450V (±225V)
♦ HIGH SLEW RATE — 1000V/μS
♦ HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
♦ HIGH VOLTAGE INSTRUMENTATION
♦ PIEZO TRANSDUCER EXCITATION
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 430V
♦ ELECTROSTATIC TRANSDUCERS &
DEFLECTION
DESCRIPTION
The PA98 is a high voltage, high power bandwidth
MOSFET operational amplifier designed for output
currents up to 200mA. Output voltages can swing up
to ±215V with a dual supply and up to +440 volts with
a single supply. The safe operating area (SOA) has
no second breakdown limitations and can be observed
with all types of loads by choosing an appropriate cur-
rent limiting resistor. High accuracy is achieved with a
cascode input circuit configuration. All internal biasing
is referenced to a bootstrapped zener-MOSFET cur-
rent source. As a result, the PA98 features an unprec-
edented supply range and excellent supply rejection.
The MOSFET output stage is biased on for linear oper-
ation. External compensation provides user flexibility.
This hybrid circuit utilizes thick film (cermet) resistors,
ceramic capacitors and silicon semiconductor chips to
maximize reliability, minimize size and give top perfor-
mance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures.
The Power SIP package is electrically isolated.
Q1
Q6
–IN
1
Q10A
Q13
EQUIVALENT SCHEMATIC
Q2 Q3
Q7
Q10B
+IN
2
D2
D1
D23 Q8 Q9
COMP
11
+VS
12
+VS
45
Q11
Q12
Q17
9
CL
10
CL
6
OUT
Q18
Q15
8
–VS
7
–VS
PA98wUww.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
APEX − PNAO98VR2E0V0K91
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| |
 
Product Innovation From
PA98ww•w.PDaAta9Sh8eAet4U.com
TYPICAL APPLICATION
DYNAMIC FOCUSING
DC
FOCUS
R IN1
RF
Dynamic focusing is the active correction of focusing voltage
as a beam traverses the face of a CRT. This is necessary in
high resolution flat face monitors since the distance between
cathode and screen varies as the beam moves from the center
of the screen to the edges. PA98 lends itself well to this func-
tion since it can be connected as a summing amplifier with
X SWEEP
SAMPLE
z = x2 + y2
Y SWEEP
SAMPLE
R IN2
+225V
R CL
PA98
TO
FOCUS
GRID
inputs from the nominal focus potential and the dynamic cor-
rection. The nominal might be derived from a potentiometer, or
225V
perhaps automatic focusing circuitry might be used to generate this potential. The dynamic correction is generated
from the sweep voltages by calculating the distance of the beam from the center of the display.
PHASE COMPENSATION
Gain
1
CC
68pF
RC
100Ω
20
10pF 330Ω
100 3.3pF 0Ω
CC RATED FOR FULL SUPPLY VOLTAGE
GENERAL
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. The minimum value is 1.4 ohm, however 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 30 ohms.
RCL = IL IM. 7 - .016
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational
amplifier has two distinct limitations:
1. The current handling capability of the MOSFET ge-
ometry and the wire bonds.
2. The junction temperature of the output MOSFETs.
NOTE: The output stage is protected against transient
flyback. However, for protection against sustained, high
energy flyback, external fast-recovery diodes should be
used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum
additional internal power dissipation the amplifier can
tolerate when it produces the necessary output to drive
an external load. This is not the same as the absolute
maximum internal power dissipation listed elsewhere in
the specification since the quiescent power dissipation
is significant compared to the total.
SOA
500
300
200
200mS
100mS
DC, T
100
50
DC, T
DC, T
C
C = 25°C
= 85°C
30 C = 125°C
20
PULSE CURVES @ 10% DUTY CYCLE MAX.
1025
50 75 100 125
250
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
PA98U
5
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| Information | Total 7 Pages | |
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| Download | [ PA98A.PDF Datasheet ] | |
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