P r o d u c t I n n o v a t i o n F r o m EK15
EK15U 1
EK15 SA08
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of
PWM ampliers using the SA08 pin-out conguration. It can be
used to analyze a multitude of standard or proprietary circuit
congurations, and is exible enough to do most standard
amplier test congurations.
The schematic is shown in Figure 3. Note that all of the
components shown on the schematic will probably not be used
for any single circuit. Some components will simply be omit-
ted, while others require installation of a jumper to complete
the signal path.
Only components unique to the EK15 are provided in this
kit. Hardware similar to that shown in Figure 1 must be ob-
tained locally.
PARTS LIST
Apex Part # Description Quantity
HS18 Heatsink 1
MS04 PC mount Cage Jacks 1 Bag/12 each
EVAL19 PC Board 1
60SPG00001 Spacer Grommets 4
TW05 Thermal Washer 1 Box/10 each
ZX7R105KTL 1µF Cap ST2225B105K501LLXW 2
Novacap
OX7R105KWN 1µF Cap 1825B105K201N, 1
Novacap
TS01 Terminal Strip 66505 1
Beau Interconnect
EC01 470 µf Cap 1
United Chemi-Con
82DA471M500MG2D
HS22 Heatsink 2
Thermolly 6025B
CSR03 0.010 ohm resistor 2
Caddock MP916-0.010 - 5%
CSR04 0.020 ohm resistor 2
Caddock MP930-0.020 - 5%
FIGURE 1.
BEFORE YOU GET STARTED
* All Apex Precision Power ampliers should be handled using
proper ESD precautions.
* Always use the heatsink included in this kit with TW05
washer.
* Always use adequate power supply bypassing.
* Do not change connections while the circuit is powered.
* Initially set all power supplies to the minimum operating
levels allowed in the device data sheet.
* Check for oscillations.
Evaluation Kit for SA08 Pin-Out
EK15
Product Innovation From
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
http://www.cirrus.com
MAY 2009
APEX − EK15UREVC
P r o d u c t I n n o v a t i o n F r o m
EK15
2 EK15U
ASSEMBLY
During assembly refer to Figure 1 and
Figure 2.
1. From the DUT of the PCB insert and
solder the 12 cage jacks. Also solder
the cage jacks from the circuit side
as well, making sure the cage jack
remains ush with the component side
of the PCB.
2. Solder the 3 surface mount ceramic
capacitors to the component side of
the PCB.
3. From the component side of the PCB
insert the terminal strip. Solder from
the circuit side of the PCB. Be sure that
the GND terminal hole in the PCB is
fully lled with solder.
4. Two values of current limiting power
resistors are supplied. Select one
value (see the amplier data sheet to
learn how to calculate which resistor
will suit your need). Coat the backside
of the power resistor with heat sink
compound (not supplied). Using 4-40
screws and nuts (not supplied) mount
the resistors to the two small heat sinks
supplied. Solder the resistor/heat sink
assembly to the component side of the
PCB.
5. Insert the electrolytic capacitor into
the PCB from the component side and
solder from the circuit side making sure
to ll the mounting holes with solder.
6. From the circuit side, push spacer
grommets into PCB until fully seated.
Grommets will snug when screws are
inserted for heatsink mounting.
7. Apply TW05 thermal washer to the
bottom of the amplier.
8. Use #14 sleeving to insulate and align
at least 2 opposite pins of the amplier.
9. Mount amplier to heatsink using #6
screws and nuts. Torque the part to
the specied 8 to 10 in-lbs (.9 to 1.13
N*M). Do not over torque.
10. Install components as needed. Ex-
ternal connections may be soldered
directly or standard banana jacks may
be soldered to the large pads at the
edge of the PCB.
11. Insert amplier pins into cage jacks
and fasten PCB to heatsink.
EVAL19
CIRCUIT DUT SIDE
16
COMPONENT SIDE
EVAL19 R-C
+Vs
1
C1
Ra
R2
Rb
PWR
C3
R1
SIG +PWM
FLAG
J1
R4
CVs1
CVcc
GND
GND
SIG
A OUT
CVs3
CVs2
+
B OUT
GND
Vcc
SPARE SPARE
SIG
GND
Vcc
RAMP/-PWM
C2
OR
IC
IC
SHDN
TB1
6
12
7
+
G
C
MIO
RTN
ECHL
OOY
R3
D1
TOP SIDE
BOTTOM SIDE
5.500
4.686
FIGURE 2. PCB
P r o d u c t I n n o v a t i o n F r o m EK15
EK15U 3
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 ampliers and associated components. The large terminal
pads can be used to solder wire connections or bannana jacks.
FIGURE 3. PCB SCHEMATIC.
SA08
+PWM
12 3 4 56
12 11 10 9 87
SIG
GND
PWR
GND
RAMP/-PWM
OR
FLAG
ILIM/SHDN
C3
R3
C2
C1
R4
J1
CLK IN CLK OUT + PWM FLAG
5V
10V
CLOCK
A OUT Vcc + Vs B OUT
B OUT
A OUT Vcc + Vs
I SENSE A I SENSE B
H
BRIDGE
DRIVER
Ra
R2
R1
CVcc
CVs1-3
5V
10V
.1V 10V
1k
1000pf
50k
Vcc
50 910
.01µF
56k
5V
GND ILim/SHDN
f/2
TL 470pF
D1
The schematic of Figure 3 can be used to verify the func-
tionality of your amplier 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 xed 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
SA08
CLK IN CLK OUT + PWM FLAG GND
5V
+PWM SIG
GND
PWR
GND
RAMP/-PWM
OR
FLAG
ILIM/SHDN
J1
CLOCK
C1
.01µF
C3
.1µF
1 Hz SDNE WAVE
+3/+7 V AMPLITUDE
VALLEY TO PEAK
10V
56k
5V
f/2
TL 470pF
ILim/SHDN
H BRIDGE DRIVER
1k
1000pf
50k
Vcc
50 910
.01µF
5V
10V
.1V 10V
B OUT
A OUT Vcc + Vs
I SENSE A I SENSE B
12 11 10 9 87
A OUT Vcc + Vs B OUT
DUMMY LOAD
Ra
.1 OHM
R2
5k
R1
5k
CVcc
1µF
CVs1-3
50 OHM 25 WATT
Rb
.1 OHM
30V HIGH
AMP
SUPPLY
15V
200 mA
SUPPLY
50
5K
D1
12 3 4 56
P r o d u c t I n n o v a t i o n F r o m
EK15
4 EK15U
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 nd 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, indemnication, 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.