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 SA08 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 EK15 are provided in this kit.
Hardware similar to that shown in Figure 1 must be obtained
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 1F Cap ST2225B105K501LLXW 2
Novacap
OX7R105KWN 1F Cap 1825B105K201N,
1
Novacap
TS01
Terminal Strip 66505
1
Beau Interconnect
EC01
470 f 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 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.
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
EVALUATION KIT
FOR SA08 PIN-OUT
EK15
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 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 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 connections. J1 is an op-
tional 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
connections or bannana jacks.
EVALUATION KIT
FOR SA08 PIN-OUT
EK15
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
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 opera-
tion. 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.
EVALUATION KIT
FOR SA08 PIN-OUT
EK15
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.
EK15U REV B OCTOBER 2004 2004 Apex Microtechnology Corp.
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