INTRODUCTION

This easy-to-use kit provides a platform for the evaluation of

linear power amplifiers circuits using the MP108FD & MP111FD

pin out. With ample bread boarding areas it is flexible enough

to analyze a multitude of standard or proprietary circuit con-

figurations. 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 terminal

pads at the edges of the circuit board. The terminal pads are

suitable for soldering standard banana jacks or direct wiring

of wires. Additionally, banana jacks and a BNC connector can

be inserted into the holes at the edge of the board and wired

to the numbered terminal pads.

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

Ref

Apex Part #

Description/Vendor

Qty

NA

HS28

Heat Sink

1

NA

HS31

Heat Sink

1

NA

MS11

Strip of 30 cage jacks

2

NA

EVAL57

PC Board

1

NA

60SPG00004

Spacer Grommets/

4

Micro Plastics

C1,4,5,6 OX7R105KWN 1uF Cap/

4

Novacap

1825B105K201N

TS1

TS02

Terminal Strip

1

C2,3

EC03

680uF 200V/

2

United Chemi-Con

KMH200VN681M25MX40T2

RLIM*

CSR18

0.050 Ohm Resistor/

1

Isotek PBV-R050-1

RLIM*

CSR19

0.100 Ohm Resistor/

1

Isotek PBV-R100-1

ASSEMBLY

During assembly refer to Figure 2 and the data sheet for

the MP108FD & MP111FD.

1. Note that each side of the circuit board is identified as either

the "component side" or "DUT side".

2. Cut the MS11 into groups of 16 and 18 cage jacks and insert

from the "DUT side" of the board. On the "component side"

of the board, solder all cage jacks having solder pads (7, 9,

10, 23, 24, 26, 29, and 31 have no solder pads). Make sure

the cage jacks are fully seated before soldering. Be careful

that solder does not flow into the cage jacks. Remove the

unsoldered cage jacks with the carrier strip segments.

3. Solder the surface mount capacitors at C1, C4, C5, and C6

on the "component side" of the board.

4. Low ohm value resistors are provided with this evaluation

kit: 0.050 ohm and 0.100 ohm. 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.

5. Mount the HS28 heat sink to the PCB and solder the mount-

ing tabs of the heat sink.

6. Apply a thin layer of thermal grease on the back of the

chosen current limiting sense resistor, insert the resistor

into the PCB and mount the resistor to the HS28 heat sink

using #4 screw and nut hardware (not supplied). Be sure

to cut off the excess resistor lead lengths.

7. Mount the electrolytic capacitors at C2 and C3 from the

"component side" of the PCB. Match the polarity markings

on the capacitor with the polarity markings on the PCB.

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.

8. 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.

9. Mount and wire the banana jacks and BNC connector (nei-

ther supplied) to the PCB pads at locations 1-5 as needed

or desired.

10. Mount other components to complete your application

circuit using the pads and holes provided.

11. From the "DUT side" of the PCB snap the spacer- grom-

mets into the holes at the four corners of the PCB. Notice

that the holes are slightly rectangular and match the spacer-

grommet's long and short sides to the holes in the PCB.

12. Apply a thin, uniform layer of thermal grease to the amplifier;

a straight edge may be useful here. Position the amplifier

over the mounting holes in the heatsink. Firmly push the

amplifier onto the heatsink while slightly rotating the ampli-

fier back and forth, ending with the mounting holes of the

amplifier over the mounting holes in the heatsink.

13. Attach the amplifier to the heatsink with 4-40x½’ male-

female hex spacers (not supplied). These spacers serve

as alignment pins and aide in the assembly of the PCB to

the heatsink. Alternatively, use 4-40x¼’ machine screws

to mount the amplifier to the heatsink. Do not over-tighten

the spacers or screws as this provides no thermal benefit

and may break the hardware.

14. Place the PCB assembly on the heatsink/amplifier assembly

so that the hex spacers come through the aligning holes

near the corners of the amplifier location in the PCB. Care-

fully lower the PCB assembly until the pins of the amplifier

engage the cage jacks. Alternately, sight through the align-

ing holes in the PCB and match-up the PCB to the screws

used to mount the amplifier. In either case be sure the pins

of the amplifier are engaged with the cage jacks and then

continue pushing the PCB assembly in the area between

APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

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