APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of
PWM amplifiers using the SA12 pin-out configuration. It can be
used to analyze a multitude of standard or proprietary circuit
configurations, and is flexible enough to do most standard
amplifier test configurations.
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 omitted,
while others require installation of a jumper to complete the
signal path.
Only components unique to the EK17 are provided in this kit.
Hardware similar to that shown in Figure 1 must be obtained
locally.
BEFORE YOU GET STARTED
* All Apex amplifiers 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 al-
lowed in the device data sheet.
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
OX7R105KWN 1µF Cap 1825B105K201N, 3
Novacap
TS01 Terminal Strip 66505 1
Beau Interconnect
EC03 680 µf Cap 1
United Chemi-Con
KMH200VN68IM25X40T2
HS22 Heatsink 2
Thermolly 6025B
CSR03 0.01 ohm resistor 2
Caddock MP916-0.010 - 5%
CSR04 0.020 ohm resistor 2
Caddock MP930-0.020 - 5%
FIGURE 1.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
EVALUATION KIT
FOR SA12 PWM AMPLIFIER
EK17
ASSEMBLY
During assembly refer to Figures 1 & 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 flush 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 filled with solder.
4. Two values of current limiting power
resistors are supplied. Select one
value (see the amplifier 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 fill 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 amplifier.
8. Use #14 sleeving to insulate and align
at least 2 opposite pins of the ampli-
fier.
9. Mount amplifier to heatsink using #6
screws and nuts. Torque the part to
the specified 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 amplifier pins into cage jacks
and fasten PCB to heatsink.
FIGURE 2. PCB
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
FIGURE 3. PCB SCHEMATIC.
A block diagram of the SA12 is shown in Figure 3 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 connections. 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, 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, operating 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 connec-
tions or bannana jacks.
EVALUATION KIT
FOR SA12 PWM AMPLIFIER EK17
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
FIGURE 4. FUNCTIONAL TEST CIRCUIT
The schematic of Figure 4 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 10 amps.
EVALUATION KIT
FOR SA12 PWM AMPLIFIER
EK17
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
EK17U REV F FEBRUARY 2005 © 2005 Apex Microtechnology Corp.
