APEX EK04

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INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of
power op amps using the PA04 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 of the PC board is shown in Figure 2. Note
that all of the components shown on the schematic will probably
not be used for any single circuit. The component locations on
the PC board (See Figure 3) provide maximum flexibility for a
variety of configurations. Also included are loops for current
probes as well as connection pads on the edge of the PC board
for easy interconnects.
The hardware required to mount the PC board and the device
under evaluation to the heatsink are included in the kit. Because
of the limitless combination of configurations and component
values that can be used, no other parts are included in this kit.
However, generic formulas and guidelines are included in the
APEX DATABOOK.
ASSEMBLY HINTS
The mating socket included with this kit has recessed nut
sockets for mounting the device under evaluation. This allows assembly from one side of the heatsink, making it easy
to swap devices under evaluation. The sizes of the stand-offs
were selected to allow proper spacing of the board-to-heatsink
and allow enough height for components when the assembly
is inverted.
PARTS LIST
Part #
HS11
EVAL04
MS05
HWRE01
TW05
Description
Heatsink
PC Board
Mating Socket
Hardware Kit
Thermal Washer
Quantity
1
1
1
1
1
HWRE01 contains the following:
4 #8 Panhead Screws
4 #6 x 1.25" Panhead Screws
4 #8 .375" Hex Spacers
4 #6 x 5/16" Hex Nuts
4 #8 1.00" Hex Stand Offs 2 #6 x 1/4" Hex Nuts
• Initially set all power supplies to the minimum operating levels
allowed in the device data sheet.
• Check for oscillations.
• Always use the heatsink included in this kit with thermal
grease or TW05 and torque the part to the specified 8-10 in-lbs
(.90-1.13 N•M).
• Do not change connections while the circuit is under power.
• Never exceed any of the absolute maximums listed in the
device data sheet.
• Always use adequate power supply bypassing.
• Remember that internal power does not equal load power.
• Do not count on internal diodes to protect the output against
sustained, high frequency, high energy kickback pulses.
ASSEMBLY
1. Insert a #6 x 1/4" hex nut in each of the nut socket recesses
located on the bottom of the mating socket.
2. Insert the socket into the PC board until it is firmly pressed
against the ground plane side of the PC board.
3. Solder the socket in place (Figure 1). Be sure the nuts are
in the recesses prior to soldering.
4. Mount the PC board assembly to the heatsink using the
stand-offs and spacers included.
5. Apply thermal grease or a TW05 to the bottom of the device
under evaluation. Insert into the mating socket through the
heatsink.
6. Use the #6 x 1.25" panhead screws to mount the amplifier to
the heat sink. Do not overtorque. Recommended mounting
torque is 8-10 in-lbs (.90-1.13 N•M).
7. On the ground plane side of the board, between terminations for –V and OUT, scrape off the green solder mask for
a ground connection. Connect the power supply common
in this area. If using the onboard Vboost generation circuits,
connect J3 to this ground also. If desired, the green solder
mask may be scrapped away on the other end of the board
for low current input signal ground connections also.
Mounting precautions, general operating considerations, and
heatsinking information may be found in the APEX DATABOOK.
BEFORE YOU GET STARTED
NOTE: Refer to HS11 in Accessories Section.
• All Apex amplifiers should be handled using proper ESD
precautions!
FIGURE 1.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
EK04
EVALUATION KIT
FOR PA04 PIN-OUT
FIGURE 2.
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TYPICAL COMPONENT FUNCTIONS
COMPONENT
FUNCTION
R1
Feedback resistor
R2
Logic shutdown
R4
Input resistor logic input
R5
Current setting resistor
R6
Input resistor logic input
R7
Input resistor
R8
Input bias current measurement (Note 4)
R9
Current limit
R10
Noise gain compensation (Note 1)
R11
Resistor divider network for biasing inputs
(Note 2)
R12
Input bias current measurement (Note 4)
R13
Resistor divider network for biasing inputs
(Note 2)
R14
Compensation resistor
C1
AC gain or stability (Note 1)
C4
Power supply bypass (Note 3)
C5
Power supply bypass (Note 3)
C7
Input coupling
C8
AC gain set
C9
Power supply bypass (Note 3)
C10
Noise gain compensation (Note 1)
C11
Power supply bypass (Note 3)
C12
Bias node noise bypass (Note 2)
C13
Bias node noise bypass (Note 2)
C14
Compensation
C16
Power supply bypass (Note 3)
C17
Power supply bypass (Note 3)
CR2
Flyback protection (Note 5)
CR3-8
Input protection (Note 5)
CR9
Flyback protection (Note 5)
CR11
Zener reference for MAX636
OPTIONAL Vboost COMPONENT FUNCTIONS
AND RECOMMENDED VALUES
C2
100µF 25V
Regulator Input Capacitor
C3
100µF 100V
Boost Output Filter Capacitor
C6
10µF 200V
Bias Filter Capacitor
C15
100µF 100V
Boost Output Filter Capacitor
C18
100µF 25V
Regulator Input Capacitor
C19
1µF X7R 100V
Boost Output Filter Capacitor
C20
1µF X7R 100V
Boost Output Filter Capacitor
CR1
1N5242
Positive Input Boost Reference
CR10 1N5819
Negative Boost Flyback Diode
CR11 1N5242
Negative Input Boost Reference
IC1
MAX632
Positive Boost Regulator
IC2
MAX636
Negative Boost Regulator
L1
330µH
Positive Boost Output Inductor
L2
330µH
Negative Boost Output Inductor
Q4
IRF9240
Positive Pass Element
Q5
IRF240
Negative Pass Element
R3
50KΩ 1Watt
Reference Bias Resistor
NOTE: Q4 and Q5 can optionally be attached to heatsinks,
Apex part # HS01. This should be done when the
total supply voltage to the PA04 exceeds 60 Vdc.
NOTES: Please refer to the following sections of the APEX
DATABOOK as noted.
1. See Stability section of “General Operating Considerations.”
2. See “General Operating Considerations.”
3. See Power Supplies section of “General Operating Considerations.”
4. See “Parameter Definitions and Test Methods.”
5. See Amplifier Protection section of “General Operating
Considerations.”
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
EK04
EVALUATION KIT
FOR PA04 PIN-OUT
FIGURE 3.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
EK04
EVALUATION KIT
FOR PA04 PIN-OUT
TYPICAL APPLICATION
ing configuration avoids any concern of common mode effects.
Typical specs of such a circuit would read as follows:
Po = 200W
F = 10kHz
RL = 4 Ohms
THD = .0061
The PA04 is well suited for wideband, low distortion, high
power applications. The circuit in Figure 4 displays the simplicity
of use offered by the PA04. The circuit is in an inverting gain of
10. This relatively low gain allows the amplifier to have more
than adequate loop gain available, resulting in extremely low
distortion at the power levels delivered. The use of the invert-
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FIGURE 4.
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OPTIONAL V BOOST
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extends the common mode range of the amplifier. The ground
connection of J3 needs to be made when assembled.
One of many inexpensive ways to acquire V boost for the
PA04 has been included as an option on this evaluation kit.
The addition of these parts not only increases swing, but also
FIGURE 5.
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HS11 HEATSINK NOTE
The HS11 Heatsink is overkill for the average application. Once maximum power dissipation for the application is determined
(refer to “General Operating Considerations” and Application Note 11 in the APEX DATABOOK), the final mechanical design will
probably require substantially less heatsinking.
APEX MICROTECHNOLOGY makes no representation that the use or interconnection of the circuits described herein will not infringe
on existing or future patent rights, nor do the descriptions contained herein imply the granting of licenses to make, use, or sell equip–
ment constructed in accordance therewith.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
EK04
COMMON
CONFIGURATIONS
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This data
sheet has been carefullyCORPORATION
checked and is believed
to be reliable,
however,
no responsibility
is assumed
for possible• inaccuracies
or omissions.
All specifications
subject to change without notice.
APEX
MICROTECHNOLOGY
• TELEPHONE
(520)
690-8600
• FAX (520)
888-3329
ORDERS (520)
690-8601
• EMAILare
prodlit@apexmicrotech.com
EK04U REV H JANUARY 2005
© 2005 Apex Microtechnology Corp.
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