PA162

6

PA162U

P r o d u c t I n n o v a t i o n F r o m

THERMALCONSIDERATIONS

The PA162DK has a large exposed integrated copper heat-

slug to which the monolithic is directly attached. The solder

connection of the heatslug to a minimum of 1 square inch

foil area of the printed circuit board will result in thermal per-

formance of 25°C/W junction to air rating of the PA162DK.

Solder connection to an area of 1 to 2 square inches of foil

is required for minimal power applications.

Where the PA162DK is used in higher power applications, it

is necessary to use surface mount techniques of heatsink-

ing. Surface mount techniques include the use of a surface

mount fan in combination with a surface mount heatsink on

the backside of the FR4/ PC board with through hole ther-

mal vias. Other highly thermal conductive substrate board

materials are available for maximum heat sinking.

The Power Derating graph assumes that the power dissipa-

tion is equal in each of the amplifiers. Power and thermal

ratings are based on two separate dual monolithic power op amps on one integrated copper heat slug. Amps A and

B are combined on one monolithic die while amps C and D are combined on the other. This multi chip configura-

tion provides superior thermal performance by isolating each of the dual amplifiers. When loading either of the dual

amplifiers it is possible to achieve better thermal performance by loading any combination of amplifiers (A or B) +

(C or D).

MOUNTINGPRECAUTIONS

1. Always use a heat sink. Even unloaded the PA162DK can dissipate up to .8 watts.

2. Avoid bending the leads. Such action can lead to internal damage.

POWER DERATING

JUNCTION TEMPERATURE, T

0

25

50

75

100

125

20

50

10

40

0

30

(A) AMPLIFIER

LOADED

(A+B)

AMPLIFIERS

LOADED

(A+B+C+D)

AMPLIFIERS

LOADED

(A+B+C)

AMPLIFIERS

LOADED

CONTACTINGCIRRUSLOGICSUPPORT

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

parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,

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-

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