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INTRODUCTION
This easy-to-use kit provides a platform for the evaluation
of PWM circuits using the MSA240KC/260KC pin out. With
ample bread boarding areas it is flexible enough to analyze
a multitude of standard or proprietary circuit configurations.
Critical connections for power supply bypassing are pre-wired.
Components not usually readily available in engineering labs
are provided. External connection to the evaluation kit can be
made via the terminal block and banana jacks at the edges
of the circuit board.
BEFORE YOU GET STARTED
• All Apex amplifiers should be handled using proper ESD
precautions.
• Do not change connections while the circuit is powered.
• Initially set all power supplies to the minimum operating
voltage allowed in the device data sheet.
PARTS LIST
Description/Vendor
Qty
Heat Sink/Apex
2
Heat Sink/Apex
1
30-pin socket carrier strip
2
PC Board
1
Spacer Grommets/
4
Micro Plastics
BJ1-4 BJ1
Banana Jack/
4
Deltron 164-6218
C1,3
ZX7R105KTL
1uf 500V Cap/
Novacap
ST2225B105K501LLXW
2
For identification note this capacitor has “legs”.
C2*
EC05
2200uF 100V/
1
United Chemi-Con
82DA222M100KC2D
C2*
EC06
470uF 450V/
1
United Chemi-Con
KMH450VN471M35X50T2
TS1
TS02
Terminal Strip
1
R1,2* CSR22
0.020Ω Resistor/
2
Isotek PBV-R020-1
R1,2* CSR20
0.010Ω Resistor/
2
Isotek PBV-R010-1
R1,2* CSR21
0.015Ω Resistor/2
Isotek PBV-R015-1
*Chosen per directions
Ref
NA
NA
NA
NA
NA
Apex Part No.
HS28
HS26
MS11
EVAL56
60SPG00004
ASSEMBLY
During assembly refer to Figure 1 and the data sheet
for the product you are using, either the MSA240KC or
MSA260KC.
1. Note that each side of the circuit board is identified as either
the component side or "DUT side".
2. Two 30-pin socket strips have been supplied with this kit
that have been loaded with cage jacks. Using wire cutters
trim the carrier to remove two sockets from one of the strips.
Insert the socket strips from the "DUT side" of the board and
solder the jacks from the "component side" of the board,
making sure that each socket strip is fully seated before
soldering. After soldering the jacks remove and discard
the plastic carrier.
3. Solder the surface mount capacitors at C1 and C3 on the
"component side" of the board.
4. From the "component side" mount banana jacks at BJ1-4
and solder from the "DUT Side" of the circuit board. Cut
off excess lead lengths. Note that BJ1 is connected to SIG
GND.
5. Several low ohm value resistors are provided with this evalu-
ation kit: 0.020Ω, 0.015Ω and 0.010Ω. These are used to
implement current limiting in the output circuit. Select the
value most appropriate for your application. Refer to the
product data sheet to determine which resistor value you
should use.
6. From the "component side" of the PCB mount the HS28
heat sink closest to C2 (to be added later) and solder the
mounting tabs of the heat sink from the "DUT side" with a
high capacity soldering iron.
7. Apply a thin layer of thermal grease on the back of the
chosen current limiting sense resistor R2 and insert the
resistor into the PCB. Mount the resistor to the HS28 heat
sink using #4 screw and nut hardware (not supplied). Place
the screw into the mounting hole from the narrow-channel
side of the heat sink and place the nut on the screw from
the wide-channel side of the heat sink. Do not over tighten
the screw. Finally, solder the resistor terminals to the PCB
and
cut off the excess lead length.
8. Mount the remaining HS28 heat sink similarly to step 6.
9. Repeat step 7 for R1 and the second HS28 heat sink.
10. Mount the electrolytic capacitor at C2 from the "compo-
nent side" of the PCB. Match the polarity markings on the
capacitor with the polarity markings on the PCB. Use the
correct voltage capacitors for the product you are using:
A 100V capacitor for the MSA240KC, or a 450V capacitor
for the MSA260KC. Be sure the capacitors have snapped
into the PCB and solder from the "DUT side" of the PCB.
Be sure to fill the holes with solder.
11. Mount the terminal strip to the "component side" of the
PCB. Make sure the terminal strip is fully seated and solder
the pins from the "DUT side" of the PCB. Be sure to fill the
mounting holes with solder.
12. Mount a BNC connector (not supplied) to the PCB at loca-
tion 5 (near the banana jacks) if desired. The body of the
BNC connector is tied to SIG GND.
13. Mount other components to complete your application
circuit using the pads and holes provided. Refer to the data
sheet for your model and note on page 4 that:
R
RAMP
= 2 X R
OSC
It is therefore convenient to use 3 resistors of equal value
and make up R
RAMP
from two of those resistors. Note on
the PCB locations for R
RAMP1
and R
RAMP2
to do this.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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