PA50 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'PA50' PDF : 4 Pages View PDF
PA50 • PA50A
Product Innova tionFrom
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 complete Application Notes library;Technical Seminar
Workbook; and Evaluation Kits.
CURRENT LIMIT
There is no internal circuit provision for current limit in the
PA50. However, the PA50 circuit board in the PA50 evaluation
kit does provide a means whereby the output current can be
sensed. An external circuit current limit can thereby be imple-
mented if needed.
BOOST OPERATION
With the VBOOST feature the small signal stages of the
amplifier are operated at higher supply voltages than the
amplifier’s high current output stage. +VBOOST (pin 11) and
–VBOOST (pin 12) are connected to the small signal circuitry of
the amplifier. +VS (pin 9,10) and –VS (pin 3,4) are connected to
the high current output stage. An additional 10V on the VBOOST
pins is sufficient to allow the small signal stages to drive the
output transistors into saturation and improve the output voltage
swing for extra efficient operation when required. When close
swings to the supply rails is not required the +VBOOST and +VS
pins must be strapped together as well as the –VBOOST and –VS
pins. The boost voltage pins must not be at a voltage lower
than the VS pins.
COMPENSATION
Compensation is internally fixed for a gain of 3 or more and
is not adjustable by the user. The PA50 therefore is not unity
gain stable.
POWER SUPPLY BYPASSING
Proper and sufficient power supply bypassing is crucial to
proper operation of the PA50. Bypass the +Vb and -Vb supply
pins with a minimum .1µF ceramic capacitors directly at the
supply pins. On the +Vs and -Vs pins use a combination of
ceramic and electrolytic capacitors. Use 1µF ceramic capaci-
tors and an electrolytic capacitor at least 10µF for each amp
of output current required.
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
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-
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PA50U
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