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 SA03 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 board is designed for surface
mounting all components except the switching amplifier.
The schematic is shown in Figure 2. 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 EK03 are provided in this kit.
Hardware similar to that shown in figure 1 must be obtained
locally.
PARTS LIST
Part # Description Quantity
HS18 Heatsink 1
MS04 PC mount Cage Jacks 1 Bag/12 each
EVAL09 PC Board 1
60SPG00001 Spacer Grommets 4
TW05 Thermal Washer 1 Box/10 each
ASSEMBLY
1. From the non-silk screen side, insert and solder cage jacks.
Be sure each one is fully seated.
2. From the non-silk screen side, push spacer grommets into
PC board until fully seated. Grommets will snug when screws
are inserted for heatsink mounting.
3. Apply TW05 thermal washer to the bottom of the amplifier.
4. Use #14 sleeving to insulate and align at least 2 opposite
pins of the amplifier.
5. 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.
6. Install components as needed. External connections may be
soldered directly or standard banana jacks may be soldered
to these pads.
7. Insert amplifier pins into cage jacks and fasten board to
heatsink.
OX7R105KWN 1µF Cap 1825B105K201N, 6
Novacap
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 levels allowed in the device data sheet.
* Check for oscillations.
FIGURE 1.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
EK03 EVALUATION KIT
FOR SA03 PIN-OUT
FIGURE 2. PCB SCHEMATIC.
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
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 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.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
EK03
EVALUATION KIT
FOR SA03 PIN-OUT
FIGURE 3. FUNCTIONAL TEST CIRCUIT
The schematic of Figure 3 can be used to verify
the functionality 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 ap-
proximately 0 to 100% at a rate of 1 Hz. The current
limit is set to 2 amps.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
EK03
FIGURE 4. PCB
�
EVALUATION KIT
FOR SA03 PIN-OUT
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.
EK03U REV F JANUARY 2005 © 2005 Apex Microtechnology Corp.
