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Thaler EVAL119 Datasheet Rev G


EVALUATION KIT FOR PAD119 EVAL119
Innovation by
PowerAmp Design
Rev G


INTRODUCTION

The EVAL119 assembled evaluation kit provides a convenient
method to become familiar with the operation of the PAD119
operational amplifier before your application circuit is
committed to production. Some assembly is required since
some user selections are needed depending on the application.
For example, a current limit resistor value needs to be selected
by the user. Also, there are several PCB mounting options
available.
Thaler Corp 2015 N Forbes Blvd Tucson AZ 85745 USA Phone (800)827-6006 or (520)882-4000 Fax (520)770-9222 Web Site:
www.Thaler.com


Critical connections for power supply bypassing and
compensation are pre-wired. Connections are also provided for
implementing fold-over current limit as well as standard
current limit with the optional PAD123 Current Limit
Accessory Module. Fold-over current limit components are not
provided since each application will have different
requirements. Diode clamps on each power supply and the
output connections are provided for those applications in which
significant inductive kickback may be found. Terminal strips
are also provided for input and output signals and power.


ASSEMBLY STEPS
Please note that the #1 cause of problems for evaluation kit
users is not reading and following the directions (all of them).
The #2 cause of problems is poor solder joints (cold or
bridging). Dont become a statistic.

each step.

Refer to the Illustrated Parts List for the components mentioned
in each assembly step. Notice that the PCB for this kit is the
EVAL118DIN, the same PCB used for the EVAL118
evaluation kit. Also, the PAD123 is mounted in the location
marked for the PAD121 Current Limit Accessory Module.
Note that some heavy PCB copper planes and some heavy
component leads are soldered in this kit. This may require a
larger soldering iron tip and/or higher soldering iron
temperatures than might normally be used. These steps are
marked with an asterisk (*).


1. Notice that the printed circuit board (PCB) is labeled on
one side as the DUT SIDE and the other side as CIRCUIT
side.

2. As shown in the illustrated parts list, cage jack strips
were used to provide you with the assembled version of this
evaluation kit. The carrier strips left over from the assembly
have been included with the kit and can be used as sockets for
the components you will use to complete your application
circuit. If desired you can cut and solder these sockets at the
input locations for the PAD119 and PAD123 and other


Assembled EVAL119 with PAD119 mounted.
Optional DIN rail mounting shown.

locations as desired. This can save soldering and
unsoldering components as the needs of your application
circuit change.

3. Refer to Jumper Selection below the Circuit
Diagram for the EVAL119 on page 4. Install the required
jumpers at the locations indicated depending on the options
you have chosen. Refer to the data sheet for the PAD123 for
complete information on current limit options.
*
4. This step may require a soldering temperature higher
than normal and/or a larger soldering iron tip. Three current
limiting sense resistors, R
S
, are provided; one 0.005 , one
0.010 and one 0.015 . Refer to the data sheet for the
PAD123 to determine which resistor value best fits your
application (if you have chosen not to use the PAD123
module select the 0.005 resistor or install a length of
heavy buss wire into the outer two holes at the location for
the sense resistor R
S
). Smear a small amount of heat sink
grease on the back of the selected resistor and then attach
the resistor loosely to heat sink HS1 at R
S
with a 4-40 X ½
screw and nut. The plastic nut driver supplied with this kit
will help here. Tighten the 4-40 resistor mounting hardware.
Solder the resistor from the CIRCUIT SIDE of the PCB
making sure that the holes are completely filled with solder.

5. D3 and D5 are transient voltage suppressor diodes and
are not supplied since the type (breakdown voltage) varies
with the application. They are not necessary for every
application. They are most commonly used in application
circuits where kickback from the load may force the supply
voltage above the limits of the amplifier.

6. The evaluation kit PCB can be mounted in several
ways. Option 1- Chassis mount. Use #6 x 1/4 M/F hex
standoffs, and #6 nut (neither supplied) attached to the PCB
at the four corners of the PCB and the chassis. Use one of
the rubber bumpers supplied at the indicated place at the
center of the amplifier on the CIRCUIT SIDE of the PCB.

EVAL119
EVALUATI
ON KI
T FOR PAD1
19
EVALUATION KIT FOR PAD119 EVAL119
ASSEMBLY STEPS CONTINUED


Option 2- Bench-top mount. Use the five rubber bumpers
supplied. These are stick-on components. Remove the release
paper from each bumper and apply the bumper to the square
outlines on the CIRCUIT SIDE of the PCB.
Option 3- DIN rail mount. The PCB can be mounted to either
1 or 2 DIN rails. For mounting the PCB to one DIN rail press
the adaptors into the PCB in the holes at the edges of the PCB
at locations 1 and 2 from the CIRCUIT SIDE of the PCB.
Make sure that the plastic tines have fully spread out on the
DUT SIDE of the PCB. If mounting to 2 DIN rails is desired,
mount DIN rail adaptors at locations 3, 4, 5 and 6 in a similar
manner. The center to center dimension of the DIN rails is to
be 2.00 [50.8mm].

Thaler Corp 2015 N Forbes Blvd Tucson AZ 85745 USA Phone (800)827-6006 or (520)882-4000 Fax (520)770-9222 Web Site:
www.Thaler.com

2

7. Components for locations R1-R7, D1, D2 are for the
optional fold-over current limiting and are not supplied. Refer
to the data sheet of the PAD119 to find out how to apply
circuits that require these components.

8. Remove the 4 hex nuts from the mounting spacers of the
PAD119.

9. Align the 4 studs of the mounting spacers with the
mounting holes in the PCB. Be sure that the amplifiers pin 1
aligns with pin 1 on the PCB. Slowly lower the amplifier into
the PCB, making sure that the pins of the amplifier and the
cage jacks mate. Push the amplifier into the PCB until the
mounting spacers meet the PCB.

10. Fasten the amplifier to the PCB with the 4 hex nuts
previously removed. Do not over-tighten the nuts as this may
strip the mounting studs. The provided plastic nut starter can
assist you here.

11. Strip 1/8 of insulation from the wires connected to the
fan. Twist and tin the wire ends. Insert the red wire into the
cage jack labeled + at the location marked FAN on the
PCB. Likewise insert the blue or black wire into the cage jack
labeled at the location marked FAN. Do not solder the
fan wires into the PCB.

12. Add components as necessary to evaluate your
application circuit. You can utilize the evaluation kit schematic
and PCB views to map out your circuit and components.
Remember, if you are using the PAD123 Current Limit
Accessory Module additional components or jumpers will
be needed to program the operation of the module. See the
PAD123 data sheet.

13. Remember that the PAD119 must be compensated to
operate correctly. See the PAD119 data sheet on Page 4 under
PHASE COMPENSATION. Your selected phase
compensation capacitor will be installed at C
C
on the
evaluation kit PCB. A 470pF capacitor has already been
installed in the evaluation kit. Additionally, a 100pF
compensation capacitor is also included in the kit. Replace C
C

as necessary for your application but keep in mind that C



14. If you have chosen to use the PAD123 accessory
module install it at this time making sure that pin 1 on the
module is aligned with the pin 1 marking on the PCB.

15. The evaluation kit assembly is complete. Be sure
you have read and followed all the assembly steps. Do not
forget any jumpers that need to be installed. Inspect the
circuit board for solder shorts or poor solder joints. An
illuminated magnifier is helpful.

16
.
Before applying power to