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PA119CE Datasheet(PDF) 4 Page - Cirrus Logic

Part # PA119CE
Description  Video Power Operational Amplifier
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

PA119CE Datasheet(HTML) 4 Page - Cirrus Logic

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P r o d u c t I n n o v a t i o n F r o m
PA119CE • PA119CEA
4
PA119U
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
The SOA curves combine the effect of these limits and allow
for internal thermal delays. For a given application, the direc-
tion 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. Capacitive and inductive loads up to the following maximums
are safe:
±V
S
CAPACITIVE LOAD
INDUCTIVE LOAD
40V
.1µF
11mH
30V
500µF
24mH
20V
2500µF
75mH
15V
100mH
2. Safe short circuit combinations of voltage and current are
limited to a power level of 100W.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
SUPPLY CURRENT
The PA119 features a class A/B driver stage to charge and
discharge gate capacitance of Q7 and Q19. As these currents
approach 0.5A, the savings of quiescent current over that of a
class A driver stage is considerable. However, supply current
drawn by the PA119, even with no load, varies with slew rate
of the output signal as shown below.
OUTPUT LEADS
Keep the output leads as short as possible. In the video
frequency range, even a few inches of wire have significant
inductances, raising the interconnection impedance and limit-
ing the output current slew rate. Furthermore, the skin effect
increases the resistance of heavy wires at high frequencies.
Multistrand Litz Wire is recommended to carry large video
currents with low losses.
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" 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 selection; Apex Precision
Power’s completeApplication Notes library;Technical Seminar
Workbook; and Evaluation Kits.
CURRENT LIMIT
Q2 (and Q25) limit output current by turning on and remov-
ing gate drive when voltage on pin 2 (pin 7) exceeds .65V dif-
ferential from the positive (negative) supply rail. With internal
resistors equal to 1.2Ω, current limits are approximately 0.5A
with no external current limit resistors. With the addition of
external resistors current limit will be:
To determine values of external current limit resistors:
PHASE COMPENSATION
At low gain settings, an external compensation capacitor is
required to insure stability. In addition to the resistive feedback
network, roll off or integrating capacitors must also be consid-
ered when determining gain settings. The capacitance values
listed in the external connection diagram, along with good
high frequency layout practice, will insure stability. Interpolate
values for intermediate gain settings.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has two distinct limitations:
SUPPLY CURRENT
400
300
200
100
0
30K
100K 300K
1M
3M
10M
FREQUENCY, F (Hz)
V
OUT = 60VP-P SINE
R
L = 500 Ω
ILIM =
+.54A
.65V
RCL
RCL =
.65V
ICL – .54A
SOA
1
10
INTERNAL VOLTAGE DROP SUPPLY TO OUTPUT, V
S-VO (V)
2
4
3
T
C=25°C
10
20
30
40 50
80
5
100
t =
100ms
t =
300ms
STEADY
STATE


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