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參數(shù)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(shù): 9/11頁
文件大小: 351K
代理商: HCA600ACREF
9
Power Supply Specifications
+Bus and -Bus
The voltage necessary to achieve full power is
±
110V. In an
unregulated supply, the no load voltage will be significantly
higher. The MOSFETs used in the amplifier support the
differential voltage between the buses. That is if the +/-Bus
are 125V, then each MOSFET has to support 250V. The
breakdown of the MOSFETS is 275V. Care must be take to
ensure that under no load, high line conditions this
breakdown voltage is not exceeded. Doing so may damage
the amplifier.
This limitation makes it difficult to achieve full power from an
unregulated power supply. The output impedance of the
transformer has to be very low and the size of the bulk
capacitance must be large. A better solution is to use a
switching power supply. This allows the amplifier to be used
to its full potential. With an unregulated power supply, 500W
is the maximum power. The amplifier will still be able to
provide 600W transient RMS power.
While not shown in the power supply diagram, high
frequency ceramic caps (0.1
μ
F) should be placed in parallel
with the electrolytic capacitors for the +/-12V bias and
12VFLT. This additional filtering will improve the performance
of the amplifier.
+12V and -12V
Each supply draws approximately 40mA. Regulation is
required. For best results make sure that the rectified
secondary voltage at minimum line voltage is greater than
the dropout voltage of the regulator. Any 100mA, 12V, linear
regulator can be used.
12VFLT
This voltage is needed to drive the gates of the MOSFETs.
The current required is on the order of 400mA. This voltage
should also be regulated. The current is high enough that a
1A regulator with heatsinking is required. This supply is
referenced to -Bus.
Do not reference this supply to
ground as the amp will be damaged.
NOTE: In applications that use multiple modules, power supplies
can be shared as long as the currents of each supply is scaled
accordingly.
The voltages on +/-Bus are dangerous.
Be careful. Do not
touch the components inside the shield when power is
applied. Make sure the bulk capacitance in the power supply
is discharged before disconnecting or connecting the edge
connector. Don’t touch uninsulated speaker wires when the
amp is running at high powers. Diodes D1- D4 are for
required for safety. Use them.
Power Supply For the HCA600ACREF
WARNING: High voltage secondary.
NOTES:
7. D1, D2 are 200V, 3A diodes. These will blow both fuses if either MOSFET in the power amplifier fails short.
8. D3, D4 are 200V, 1A diodes that return energy to the supply if a fuse blows.
FIGURE 6.
+
-
12VFLT
AC INPUT
12,000
μ
F
160V
12,000
μ
F
160V
470
μ
F
35V
1,000
μ
F
35V
1kVA TRANSFORMER
125V NO LOAD
12V
REG
100
μ
F
25V
+12V
-12V
100
μ
F
16V
19V NO LOAD
19V NO LOAD
92VAC
92VAC
13.6VAC
15A
1A
15A
STAR GROUND
-125V NO LOAD
PINS 1, 4
AGND
PINS 12, 13
+BUS
PINS 15, 16
-BUS
PIN 9
-12V
PIN 10
+12V
PINS 11, 14, 18
PGND
PIN 17
12VFLT
D1
D2
D3
D4
+
-
13.6VAC
13.6VAC
19V NO LOAD
470
μ
F
35V
16V
100
μ
F
REG
-12V
12V
REG
HCA600ACREF
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