HCA600ACREF 查看數據表（PDF） - Intersil
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HCA600ACREF Datasheet PDF : 11 Pages
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HCA600ACREF
Schematic Diagram of HCA600ACREF Board Test Setup
TO AUDIO GENERATOR
OUTPUT END OF HCA600ACREF
ANALYZER GND
TO DISTORTION ANALYZER INPUT
AMPLIFIER LOAD RESISTOR
-+
11
22
VV
S
A
G
N
D
+-
II
NN
PP
UU
TT
A
G
N
D
EF
NA
AN
B
L
E
CS
LF
OC
UL
TO
U
T
MAKE SURE SUPPLY
IS STABLE WITH
CAPACITORS
P + + P - - 1P
G BB GB B 2G
N UU NU U VN
D SS DS S FD
L
T
+
12V
-
+
12V
-
12,000µF +
+
12V
-
-
120V
+
+
120V
-
12,000µF +
TO EARTH GND
CAUTION: Remove all power when inserting or removing the amplifier board. Make sure power supply capacitors are discharged or damage to the
amplifier may result.
Board Test Equipment and Test Procedure
for Intersil HCA600ACREF Amplifier
Equipment required for evaluation of the Intersil
HCA600ACREF Amplifier is as follows:
1. Few bench supplies can deliver the rated voltage and
current for this amplifier. Furthermore, most linear bench
supplies cannot sink current. If at all possible a 1KVA
transformer (92V-0-92V) and rectifier should be used to
supply main power. See Figure 6. Bench supplies can be
used to provide bias as shown on the next page.
2. Three 12V, 500mA Power Supplies (if transformer with the
required secondary windings is not available).
3. Distortion Analyzer such as the Audio Precision System
One or System Two or equivalent.
4. Load resistors, 8Ω, 500W and 4Ω, 1000W and a fan.
5. Associated connectors and cables.
6. HCA600ACREF Amplifier Board.
Test Procedure for Evaluation of HCA600ACREF
1. The power supply sequencing is not critical with one
exception. The -12V must be applied at the same time or
before the +12V. If not, the amp may not start.
Frequency sweeps should be limited between 3Hz and 80kHz
at high powers. Amplitude vs. frequency sweeps at full power
will not damage the amplifier. Nevertheless, high frequency
(>10kHz) high power continuous sine wave testing may result in
a thermal shutdown and in extreme cases failure, so this should
be avoided. Music does not contain high frequency high power
signals so this is not a concern in real applications.
WARNING: This amp is DC coupled. Do not apply DC to
the input. In applications, a DC blocking cap is required in
the preamp or between the preamp and the amplifier. For
example, a 2.2µF film capacitor between the preamp and
the -input will roll the frequency response off at 7Hz (10K
input impedance).
2. THD measurements are not valid if the AP filters are not
used. The AP interprets the carrier of a class D amplifier as
noise. Filters must be used to remove the carrier. Always
make sure that either the 22, 30 or 80kHz filters in the AP
are selected. The 80kHz filter does not attenuate the carrier
completely, and if it is selected an external 80kHz RC filter
should also be used. This filter must use a high quality cap
so that it does not contribute to THD. A 10K metal film
resistor with a 180pF polypropylene cap does the job well.
If the carrier is visible with a scope on the reading output of
the AP, then the AP is including the switching frequency in its
THD+ Noise calculations. The number is not valid.
Selecting the 80kHz filter and using a single pole external
80kHz low pass filter allows the 2nd, 3rd and 4th harmonics
of a 20kHz signal to be observed.
The external RC filter should also be used when measuring
IMD and CCIF.
7
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