* 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.
SHORT TO ±V
S
SHORT TO
C, L OR EMF LOAD
COMMON
±V
S
18V
.5A
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.
0
.5
1.0
TIME, t (µS)
1.5
0
LOADING EFFECTS
DELTA GAIN WITH LOAD, ∆A (dB)
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.
–.3
–.6
–.9
–1.2
–1.5
I
O
= 400mA
I
O
= 150mA
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 recom-
mended 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.
100
10K
1K
FREQUENCY, F (Hz)
.1M
4
PA02U
P r o d u c t I n n o v a t i o nF r o m
PA02 • PA02A
COntACting CiRRUs LOgiC sUPPORt
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
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copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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