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
A block diagram of the SA08 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 connec-
tions. 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 ad-
dition, a large electrolytic capacitor is included. This capacitor
was selected expressly for this evaluation kit and may not be
(and likely won't be) suitable for your end application. You will
need to select an electrolytic capacitor based on your analysis
of the capacitor's ripple current, ripple current tolerance, operat-
ing temperature, operating voltage, acceptable service life and
acceptable supply ripple. 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 connections or bannana jacks.
FIGURE 3. PCB SCHEMATIC.
A OUT
Vcc
+ Vs
B OUT
50 OHM 25 WATT
DUMMY LOAD
15V
200 mA
SUPPLY
A OUT
Vcc
30V HIGH
AMP
SUPPLY
+ Vs
B OUT
CVcc
1µF
Ra
.1 OHM
R2
5k
CVs1-3
Rb
.1 OHM
R1
5k
CVcc
Ra
R2
CVs1-3
R1
12
11
A OUT
10
Vcc
9
+ Vs
8
B OUT
7
I SENSE B
I SENSE A
12
I SENSE A
11
A OUT
10
Vcc
9
+ Vs
8
B OUT
7
I SENSE B
5V
.1V
1k
10V
H BRIDGE DRIVER
10V
5V
.1V
1k
1000pf
10V
10V
H
BRIDGE
DRIVER
1000pf
50k
910
.01µF
Vcc
50
50k
Vcc
50
910
.01µF
SA08
10V
5V
56k
f/2 470pF
5V
SA08
10V
5V
TL
f/2
56k
470pF
5V
TL
CLOCK
CLK IN
CLK OUT
+ PWM
FLAG
GND
ILim/SHDN
1
CLOCK
CLK IN
1
J1
CLK OUT
2
3
C1
+ PWM
4
C2
FLAG
5
GND ILim/SHDN
6
C3
R3
2
J1
3
C1
.01µF
4
5
6
5K
C3
.1µF
50
D1
+PWM
R4
D1
RAMP/-PWM
OR
FLAG
SIG
GND
PWR
GND
ILIM/SHDN
+PWM
RAMP/-PWM
OR
FLAG
SIG
GND
PWR
GND
ILIM/SHDN
1 Hz SDNE WAVE
+3/+7 V AMPLITUDE
VALLEY TO PEAK
EK15U
3
EK15
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
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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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