A block diagram of the amplifier is shown in Figure 2 along with
pcb connections of all the commonly used external components.
Your application circuit will not use all of the components. Add
those components required by your circuit. You may have to
jumper some components to make the desired electrical con-
nections. J1 is an optional way to connect the clock circuit.
Power supply bypassing is particularly important and that is
why high quality ceramic chip capacitors are supplied with
the kit. In addition you may need to add a 10-50 uF or larger
capacitor on the +Vs pin. This additional capacitor needs to
be rated for switching operation. Note that the signal ground
and power ground are separated and tie together only at the
ground pin (5). A breadboarding area is supplied which can
accomodate 1 or 2 IC amplifiers and associated components.
The large terminal pads can be used to solder wire connec-
tions or banana jacks.
The schematic of Figure 3 can be used to verify the func-
tionality of your amplifier and help you gain a familiarity with
proper operation. At either A Out or B Out, with respect to
ground, you should observe a square wave approximately 30
V in amplitude with a fixed frequency and duty cycle that varies
from approximately 0 to 100% at a rate of 1 Hz. The current
limit is set to 2 amps.
FIGURE 3. FUNCTIONAL TEST CIRCUIT
FIGURE 2. PCB SCHEMATIC.
SA03
SA03
*
*
*
*
Input protection, 10V zener diode.
2
EK03U
P r o d u c t I n n o v a t i o nF r o m
EK03
FIGURE 4. PCB
TOP SIDE
SPARE
B OUT
+Vs
Vcc
A OUT
I SENSE B
I SENSE A
7
12
EK03
R2
R1
CVs
Rb
CVcc
4.686
EVAL09
REV-B
Ra
1
SIG
GND
SIG
GND
R3
ILIM/
SHDN
SIG
GND
-PWM/
RAMP
C3
C1
PWR
GND
C2
J1
R4
+PWM
CLK
OUT
CLK
IN
5.500
BOTTOM SIDE
EK03U
1
3
EK03
P r o d u c t I n n o v a t i o nF r o m
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-
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.
京公网安备 11010802033920号
EEWORLD
