PA02 Datasheet, PDF (4/5 Pages) Cirrus Logic – POWER OPERATIONAL AMPLIFIERS

PA02 • PA02A
OPERATING
CONSIDERATIONS
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Product Innovation From
GENERAL
Please read Application Note 1 "General Operating Considerations" which cov-
ers 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
The SOA curves combine the ^
effect of all limits for this Power ^
Op Amp. For a given application, ^
the direction and magnitude of _
the output current should be cal-
culated 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:

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1. Under transient conditions,
capacitive and dynamic* loads
up to the following maximums
are safe:


       
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±V_S
18V
15V
10V
CAPACITIVE LOAD
I_LIM = 2A
2mF
I_LIM = 5A
0.7mF
10mF
2.2mF
25mF
10mF
INDUCTIVE LOAD
I_LIM = 2A
.2H
I_LIM = 5A
10mH
.7H
25mH
5H
50mH
* If the inductive load is driven near steady state conditions, allowing the output
voltage to drop more than 8V below the supply rail with I_LIM = 5A, or 17V below the
supply rail with I_LIM = 2A while the amplifier is current limiting, the inductor should
be capacitively coupled or the current limit must be lowered to meet SOA criteria.
2. The amplifier can handle any EMF generating or reactive load and short circuits
to the supply rails or shorts to common if the current limits are set as follows at
T_C = 85°C.

±V_S
18V
SHORT TO ±V_S
C, L OR EMF LOAD
.5A
SHORT TO
COMMON
1.7A
15V
.7A
2.8A
10V
1.6A
4.2A
These simplified limits may be exceeded with further analysis using the operating
conditions for a specific application.
CURRENT LIMIT
Proper operation requires the use of two current limit resistors, connected as shown
in the external connection diagram. The minimum value for R_CL is 0.12 ohm, however for
optimum reliability it should be set as high as possible. Refer to the “General Operating
Considerations” section of the handbook for current limit adjust details.
DEVICE MOUNTING
The case (mounting flange) is electrically isolated and should be mounted directly to a
heatsink with thermal compound. Screws with Belville spring washers are recommended
to maintain positive clamping pressure on heatsink mounting surfaces. Long periods
of thermal cycling can loosen mounting screws and increase thermal resistance.
Since the case is electrically isolated (floating) with respect to the internal circuits it
is recommended to connect it to common or other convenient AC ground potential.

PA02U