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PDF HCA125ACREF Data sheet ( Hoja de datos )
| Número de pieza | HCA125ACREF | |
| Descripción | 125/220 Watt Full Bandwidth Class D Amplifier | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HCA125ACREF
February 1999 File Number 4588.2
125/220 Watt Full Bandwidth Class D
Amplifier
The HCA125ACREF reference
design delivers 125W RMS
power into a 8Ω load and 220
watts into a 4Ω load. Since the
efficiency is greater than 90%, no expensive, bulky heatsinks
are required.
The design is part of Intersil’s Cool Audio program that
supports customers to achieve a minimum time-to-market for
audio end products. As part of this program, this design is
offered after execution of a Licensing Agreement. At that
time, Intersil provides to the licensee a documentation
package containing: 1) Circuit Description, 2) Schematics, 3)
Test and Manufacturing Information, 4) A Bill of Materials
with all vendors and vendor part numbers, 5) Intersil’s
Engineering Support Contacts, 6) and One Evaluation Unit.
For more information, see us on the web, home page
http://www.intersil.com. For technical assistance, call Central
Applications at 1-800-442-7747, or email us at
Ordering Information
Contact Intersil licensing agents, Continental Far East or
International Operations. See contact information provided
in this document.
Reference Design Block Diagram
Features
• 125 Watts RMS Power into 8Ω
• 220 Watts RMS Power into 4Ω
• THD <0.07% at 1kHz and 110W into 8Ω
• SNR 110dB Relative to Full Power
• Output Noise, 10Hz to 22kHz . . . . . . . . . . . . . . . . . 110µV
• Constant Group Delay
• DC to 80kHz Small Signal Bandwidth
• Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 28kHz
• Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V/µs
• Efficiency >90% at 100W into 8Ω
• Meets FCC and EN55013 Requirements for EMC
• Based On the Intersil HCA8001, Audio Specific IC
• Modular Design
• Differential Input
• Over-Current, Over-Voltage and Thermal Protection
• Soft Clipping
• Bridgeable up to 800W
Applications
• Powered Speakers
• Professional Audio
• Home Theater
• Hi-Fi Stereo
DVD
CD
PLAYER PLAYER
PRE-AMPLIFIER
HCA125ACREF
HCA125ACREF
172.7MM (6.8” )
HCA125ACREF
HCA125ACREF
HCA125ACREF
HCA125ACREF
TUNER, PRE-AMPLIFIER
DOLBY™ DIGITAL DECODER
DISPLAY DRIVERS
HCA8001
POWER
SUPPLY
HEATSINK / EMI SHIELD
FETS AND DIODES
HCA8001
27.9MM (1.1” )
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Coolaudio™ is a trademark of Intersil Corporation. Dolby™ is a registered trademark of Dolby Laboratories, Inc.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HCA125ACREF
Typical Performance Curves
1
THD + N(%) vs FREQUENCY
LOAD = 8Ω
0.1 100W
50W
50W
0.01
20W
1W
0.001
0.0005
10
100 1K
FREQUENCY (Hz)
10K 30K
FIGURE 2. THD + N(%) vs FREQUENCY LOAD = 8Ω
52.0
AMPLIFIER OUTPUT vs INPUT
45.5
LOAD = 8Ω
39.0
R= ∞
338
258
190
32.5
26.0
R = 10K
R = 20K 132
84.5
19.5
47.5
13.0
21.5
6.5 5.3
0.0 0.0
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
INPUT VOLTAGE (VRMS)
FIGURE 4. AMPLIFIER TRANSFER CHARACTERISTIC WITH
VARIOUS SETTINGS OF SOFT CLIPPING
RESISTOR
Soft Clipping
Figures 4, 5 and 6 show the effects of the soft clipping
circuitry within the amplifier. Figure 4 shows the transfer
characteristic of the amplifier for various values of the soft
clipping programming resistor. An important aspect of soft
clipping is the apparent increase in sound level. As soft
clipping is reached, the upper and lower envelope of the
sinewave is gradually reduced. The “soft” clipping or
rounding reduces the higher harmonics that would result if
hard clipping as shown in Figure 6 was enabled. Soft
clipping also results in an amplifier with a more pleasing
sound. Figure 5 shows the rounding of the output with soft
clipping, while Figure 6 shows the amplifier output without
soft clipping.
1.0
LOAD = 8Ω
0.0
LOAD = 4Ω
-1.0
AMPLIFIER RESPONSE (dBr) vs FREQUENCY
-2.0 10 WATTS
-3.0
-4.0
-5.0
-6.0
10
100 1K
10K
FREQUENCY (Hz)
FIGURE 3. AMPLIFIER FREQUENCY RESPONSE AT
10W - LOAD = 8Ω
80K
DSA 602A DIGITIZING SIGNAL ANALYZER
1ms/DIV
FIGURE 5. OSCILLOSCOPE DISPLAY OF AMPLIFIER
OUTPUT WITH SOFT CLIPPING CIRCUIT
ENABLED
DSA 602A DIGITIZING SIGNAL ANALYZER
1ms/DIV
FIGURE 6. OSCILLOSCOPE DISPLAY OF AMPLIFIER
OUTPUT WITH SOFT CLIPPING CIRCUIT
DISABLED
5
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| PDF Descargar | [ Datasheet HCA125ACREF.PDF ] | |
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