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參數資料
| 型號： | HCA600ACREF |
| 廠商： | Intersil Corporation |
| 英文描述： | 600W/1000W Full Bandwidth Class D Amplifier |
| 中文描述： | 600W/1000W全帶寬D類放大器 |
| 文件頁數： | 10/11頁 |
| 文件大小： | 351K |
| 代理商： | HCA600ACREF |
10
Heat Sinking
The HCA600ACREF heat sink must be supplemented to
achieve full power. The amount of additional heatsinking
depends on the airflow.
For bench testing, a small fan set up within inches of the
board blowing across the shield is sufficient for full power
testing. The resistors used to test the board will also likely
require a fan.
In applications, the internal thermal transfer plate should be
bolted to the chassis. This can be accomplished by either
placing the board horizontally so that the shield is in thermal
contact with the bottom or side of the chassis or by using an
L bracket which mounts to both the chassis and the thermal
plate. The shield will not make good thermal contact with the
thermal transfer plate unless a stiff piece of aluminum is
bolted to the transfer plate from the outside of the shield.
The reference design uses 125 mil aluminum bars for this
purpose. The chassis and L bracket can also serve the same
purpose, allowing the aluminum bars to be discarded. The
aluminum shield is necessary for EMC compliance. Do not
remove it.
To ensure a long and reliable life, the heatsinking should be
designed so that the module typically runs at 70
o
C or less.
Higher operating temperatures will reduce the lifetime of
the module.
It is also important to use high temperature fiber washers
when mounting the FETs to the transfer plate. Teflon and
plastic washers will flow at high temperatures causing the
FETs to loose contact with the transfer plate and fail.
At one third power into 4
(333W) the efficiency is 85%. The
amplifier shuts down when the heat sink temperature is
100
o
C. Allowing for a temperature rise of 50 degrees above
ambient, the thermal resistance of the heat sink must be
approximately 1
o
C per watt. A fan is highly recommended.
With a small fan, the existing heat sink bolted to the chassis
is more than adequate.
Assembly
Make sure the FETs are secure, and use thermal grease on
both sides of the aluminum oxide spacers. Glue the
inductors down and ensure that the coils of the output choke
do not run against the shield. This, may cause a short. The
large inductor should be glued to the shield and the board,
so that it is anchored securely. Thermal grease between the
transfer plate and shield is required. Place small washers
under the heatsink to lift it up off the board. The washer next
to R3 requires thermal grease on both sides so that the
thermistor used to sense the temperature of the thermal
transfer plate will be in thermal contact.
GROUNDING
As in all audio amplifiers, grounding is important. The
module has two ground planes, power and analog. These
are connected on the board by a zero ohm jumper, R31.
In
most applications, this jumper should be removed, and
analog ground should make one and only one connection
with power ground, (star ground) - see Figure 6 for power
supply transformer.
AUTOMATIC RESTART INTO SHORT
The amplifier is capable of distinguishing a low impedance
load from a dead short. If the output is shorted with a low
impedance, the amp will deliver 30A for 50ms and then shut
down. If the impedance is very low (a short), the amplifier will
deliver 50A for a short burst and then shut down. In either
case, power must be cycled by the user to restart the
amplifier. The amp will not shut down if the impedance of the
loudspeaker dips, or if the speakers are momentarily
shorted. In this case, the amplifier limits the current supplied
to the loudspeaker. The amplifier is designed for use with 4
and 8
speakers. It is stable into 2
and 1
loads, but the
magnetics and heatsinking are not designed for low
impedance speakers or multiple speakers in parallel.
If auto restart into a dead short is absolutely required, then
populate R59 with a 10
805 resistor, and change C11 to a
0.1
μ
F, 10V, 1206 capacitor. The current limit time out will
now be 5ms, and the amplifier will always try to restart after
a dead short one or more times. For safety and reliability
issues, if the current ramps to more than 50A on any start up
attempt, the amplifier will shut down and power will need to
be cycled. In this mode, unless the short is removed quickly
the fuses in the power supply will blow. After the short is
removed and the fuses replaced the amp will restart. Most
users should not use auto restart, as it is easier for the
customer to cycle power than replace a fuse.
EMC COMPLIANCE AND POWER SUPPLY WIRING
As with all Harris reference designs the amplifier meets both
FCC and CE requirements when placed in a suitable chassis
with appropriate use of by-pass capacitance. The audio
input requires a 1000pF NPO capacitor to chassis, and the
+speaker cable requires a 0.047
μ
F 200V NPO or X7R
capacitor. The negative audio input and speaker return
should be grounded to the chassis. A power line filter is also
required to meet conducted emission specifications.
SHIELD
125 mil BARS
TRANSFER PLATE
PC BOARD
FIGURE 7.
HCA600ACREF
Teflon is a trademark of E. I. Du Pont De Nemours and Company.
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