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HCA600ACREF
P RE L I M I NA R Y
Data Sheet
October 1999
File Number
4777
600W/1000W Full Bandwidth Class D Amplifier
The HCA600ACREF reference design delivers 600W RMS power into a 8 load and 1000W into a 4 load. The design is part of the Intersil's CoolaudioTM 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) a 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) one evaluation unit. For more information, visit our web page at http://www.intersil.com. For technical assistance, call Central Applications at 1-800-442-7747, or email us at centapp@intersil.com.
Features
* 600W RMS Power into 8 * 1000W RMS Power into 4 * THD <0.02% at 1kHz and 450W into 8 * SNR >110dB Relative to Full Power * Output Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . <200V * Constant Group Delay * DC to 80kHz Small Signal Bandwidth * Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . .28kHz * Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V/s * Efficiency >90% at 500W into 8 * Meets FCC and EN55013 Requirements for EMC * Based On the Intersil HCA8001, Audio Specific IC * Differential or Single Ended Input * Over-Current, Over-Voltage and Thermal Protection * Soft Clipping * Bridgeable up to 4000W
Licensing Information
Contacts for licensing details, reference design evaluation, and general questions are as follows: Continental Far East, Email cfelic@ca.mbn.or.jp Intersil Cool Audio, Email coolaud@intersil.com
Applications
* Sound Reinforcement * Professional and Commercial Sound Systems * Powered Speakers * Hi-Fi Stereo
Reference Design Block Diagram
SOURCE 1 SOURCE 2 PRE-AMPLIFIER HCA600ACREF POWER DISTRIBUTION HCA600ACREF HCA600ACREF HCA600ACREF HCA600ACREF 78 MM (3.08") 27.9MM (1.1") HCA600ACREF 220MM (8.7")
HCA8001 POWER SUPPLY
HEATSINK / EMI SHIELD FETS AND DIODES HCA8001
NOTE: The HCA600ACREF can be used in many different commercial and professional applications including movie theater surround sound systems as depicted in this reference design block diagram.
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 407-727-9207 | Copyright (c) Intersil Corporation 1999 CoolaudioTM is a trademark of Intersil Corporation.
HCA600ACREF
Absolute Maximum Ratings
Bus Voltage, VBUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130V (Note 1) +/-12V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/-15V 12VFLT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -Bus +15V Audio Inputs . . . . . . . . . . . . . . 12V Differential Peak to Peak Voltage NOTE:
Operating Conditions
Bus Voltage, VBUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110V +/-12V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +/-12V 12VFLT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -Bus +12V Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . 0oC to 50oC
1. WARNING: The voltages inside the shield, at the edge connector, and on the speaker cables are potentially deadly. Extreme caution is required.
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications
RLOAD = 8, VBUS = 110V, Supply Source Resistance < 2.5, Storage Capacitor > 12,000F, 12VFLT = 12V, +/-12V = +/-12V TA = 25oC
PARAMETER SUPPLY SPECIFICATION Minimum Bus Voltage VBUS RMS Current VBUS RMS Current VBUS,Q Average Current 12V Float Current Minimum +/-12V 12V Max RMS Current Rising Under Voltage Lock Out Voltage Falling Under Voltage Lock Out Voltage ENABLE Threshold Voltage ENABLE Threshold Voltage ENABLE Internal Source Current OUTPUT POWER AND EFFICIENCY Maximum Output Power (Note 2) Maximum Output Power (Note 2) Maximum Output Power (Note 2) Maximum Output Power (Note 2) Efficiency
SYMBOL
TEST CONDITIONS
TYP
UNITS
VBUS MIN IV BUS IV BUS IVBUSQ I 12VFLTBIAS VBIASmin I+/-15V VUV Rising VUV Falling VENABLE1 VENABLE2 I ENABLE
600W into 8 1kHz Sine Wave, Full Output Power (8 load) 1kHz Sine Wave, Full Output Power (4 load) Quiescent Current, No Signal Current supplied to power output gate driver circuitry 1kHz Sine Wave, Full Output Power (8 load) No input signal Bus voltage that activates the amplifier Bus voltage that shuts down the amplifier Amplifier starts at this voltage, input amplifier muted Input amplifiers active and entire amplifier active Internal "Pull Up" Current
110 3 6 60 400 11.5 40 75 50 1 2 25
V A A mA mA V mA V V V V A
PMAX8 10% THD8 PMAX4 10% THD4 PMAXEFF PMAXEFF PMAXEFF PMAXEFF
THD = 1%, 1kHz, RLOAD = 8 THD = 10%, 1kHz, RLOAD = 8 THD = 1%, 1kHz, RLOAD = 4 THD = 10%, 1kHz, RLOAD = 4 POUT = 200W, 8 POUT = 500W, 8 POUT = 400W, 4 POUT = 1000W, 4
600 800 1000 1200 88 95 88 90
W W W W % % % %
AMPLIFIER PERFORMANCE Total Harmonic Distortion + Noise Signal to Noise Ratio Output Noise Intermodulation Distortion PSRR (VOUT /VBUS)
THD+N
POUT = 400W, RLOAD = 8, 1kHz Relative to full scale output, 600W into 8
0.015 110 200
% dB V % V/V
VSNR VN IMD PSRR
SMPTE, 60Hz and 7kHz, 4:1, RLOAD = 8 at 25W Output DC
0.02 300
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HCA600ACREF
Electrical Specifications
RLOAD = 8, VBUS = 110V, Supply Source Resistance < 2.5, Storage Capacitor > 12,000F, 12VFLT = 12V, +/-12V = +/-12V (Continued) TA = 25oC PARAMETER PSRR (VOUT /VBUS) Amplifier Output Offset Voltage Amplifier Output Impedance Damping Factor ADDITIONAL CHARACTERISTICS Cutoff Frequency, Referenced to 1kHz Cutoff Frequency, Referenced to 1kHz 20kHz Response, Referenced to 1kHz Power Bandwidth Slew Rate Maximum Switching Ripple on Output Input Gain Input Impedance, Inverting Input Input Impedance, Non Inverting Input Output Signal Phasing Over Temperature Shut Down Over Temperature Hysteresis Amplifier Output Current Limit Amplifier Output Current Limit Time (Note 3) NOTES: 2. At this power level, the soft clipping circuitry is beginning to activate. It functions to "round off" peaks rather than hard limit as in most linear amplifiers. This helps to give this amplifier a pleasing sound during limiting. Moreover, this feature also makes the amplifier "sound louder". 3. This time allows the amplifier to reproduce large, sustained peaks without shutting down, yet is adequate to protect the amplifier output from shorted speaker lines. FUPPER8 FUPPER4 FR at 20kHz PBW SR FPWM AV R-INPUT R+INPUT Phasing OTSD OTH IL TIL -3dB, RLOAD = 8 at 10W Output -3dB, RLOAD = 4 at 10W Output Output at 20kHz and 10W, RLOAD = 8 Maximum Frequency for Full Power RLOAD = 8 Maximum rate of change of the output voltage Full Output Power, RLOAD = 8 Either Inverting or non inverting input. Unused input returned to analog ground Differential amplifier input, other input grounded Differential amplifier input, other input grounded Positive going signal on non Inverting input results in negative going amplifier output Rising temperature to shutdown amplifier. Set by an external thermistor Difference between rising and falling temperature shut down and start up points Absolute Value Time the amplifier must be in current limiting before shutdown 80 70 -0.5 28 18 12.0 26 10 5 180 110 10 25 50 kHz kHz dB kHz V/s V dB k k Degrees
oC oC
SYMBOL PSRRac |VOS| ZOUT DF 120Hz
TEST CONDITIONS
TYP -65 2 16 500
UNITS dB mV m
DC voltage across the speaker, load = 8 Measured at 1kHz and 10W Output Measured at 1kHz and 10W Output
A ms
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HCA600ACREF HCA600ACREF Connector Pin Designations
PIN 1 2 3 4 5 6 DESIGNATION Analog Ground Non-Inv Input Inv Input Analog Ground Enable Fan FUNCTION Input Ground Audio Input Audio Input Input Ground Enable WIRE COLOR Black (22 Gauge) Phono Phono Black (22 Gauge) Green (22 Gauge) Add capacitance to delay startup or pull low to disable amp. Optional SPECIFICATIONS AND COMMENTS Connect to ground of pre-amp or connect to pin 18. Audio applied to pin 2 does not invert the phase of the signal. Input impedance is 5k. Pin 3 and 4 are differential inputs. Audio applied to pin 3 inverts the phase of the signal. Input impedance is 10k.
Controls fan or drives LED Brown indicating over temperature (22 Gauge) shutdown Drives LED to indicate onset of current limit Drives LED to indicate soft clipping is activated - Bias Supply + Bias Supply Power Ground Positive Supply Positive Supply Power Ground Negative Supply Negative Supply Floating 12V supply (referenced to -Bus) Power Ground Grey (22 Gauge) Blue (22 Gauge) Purple (22 Gauge) Orange (22 Gauge) Black (16 Gauge) Red (16 Gauge) Red (16 Gauge) Black (16 Gauge) White (16 Gauge) White (16 Gauge) Yellow (20 Gauge) Black (16 Gauge)
7 8 9 10 11 12 13 14 15 16 17 18
CL_OUT SFCL_OUT -12V +12V PGND +BUS +BUS PGND -BUS -BUS +12VFLT PGND
Optional Optional 50mA, -12V 10% 50mA, +12V 10% Connect to Star Ground For best results use at least 12,000F, 160V electrolytic capacitor. Limit Bus under no load conditions to 130V.
For best results use at least 12,000F, 160V electrolytic capacitor. Limit Bus under no load conditions to 130V.
500mA, +12V 10% This signal is referenced to the negative rail (-Bus).
Molex Part Numbers: Header - 26-60-5180, Connector - 09-50-8183, Pins - 08-52-0113 WARNING: Insulate wires. Accidental shorts between +/- Bus and bias supplies will damage the amplifier.
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HCA600ACREF Typical Performance Curves
1 1.000 LOAD = 8 0.0 AMPLIFIER OUTPUT (dBr) 400W 0.1 THD + N (%) LOAD = 4 -1.000 -2.000 -3.000 -4.000 -5.000 0.001 0.0005 10 -6.000 100 1k FREQUENCY (Hz) 10k 30k 10 100 1k FREQUENCY (Hz) 10k 80k
0.01 20W
FIGURE 1. THD +N (%) vs FREQUENCY LOAD = 8
FIGURE 2. AMPLIFIER FREQUENCY RESPONSE 10W - LOAD = 8
AMPLIFIER OUTPUT vs INPUT 90 LOAD = 8 OUTPUT VOLTAGE (VRMS) 78 65 R = 10K 52 39 26.0 13.0 0.0 0.0 0.6 0.12 0.18 2.4 3.0 3.6
R=
R = 20K
1012 760 528 338 190 84 21 OUTPUT POWER (WRMS)
DSA 602A DIGITIZING SIGNAL ANALYZER
4.2
4.8
5.2
0.0 6.0 1ms/DIV
INPUT VOLTAGE (VRMS)
FIGURE 3. AMPLIFIER TRANSFER CHARACTERISTIC WITH VARIOUS SETTINGS OF SOFT CLIPPING RESISTOR
Soft Clipping
Figures 3, 4 and 5 show the effects of the soft clipping circuitry within the amplifier. Figure 3 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 envelop of the sinewave is gradually reduced. This "soft" rounding reduces the higher harmonics that would result if hard clipping as shown in Figure 5 was enabled. Soft clipping also results in an amplifier with a more pleasing sound. Figure 4 shows the rounding of the output with soft clipping, while Figure 5 shows the ampler output without soft clipping.
100V/DIV
FIGURE 4. OSCILLOSCOPE DISPLAY OF AMPLIFIER OUTPUT WITH SOFT CLIPPING CIRCUIT ENABLED
DSA 602A DIGITIZING SIGNAL ANALYZER
100V/DIV
1ms/DIV
FIGURE 5. OSCILLOSCOPE DISPLAY OF AMPLIFIER OUTPUT WITH SOFT CLIPPING CIRCUIT DISABLED
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HCA600ACREF Full Size Outline of HCA600ACREF Board
HCA600ACREFC TOP VIEW
SFCLOUT ENABLE PC BOARD CONNECTIONS SHOWN FROM THE TOP OR COMPONENT SIDE
+INPUT
12VFLT
CLOUT
-INPUT
AGND
18
AGND 1
PGND
PGND
PGND
+BUS
+BUS
-BUS
-BUS
+12V
-12V
FAN
OUT76.2MM (3.08")
OUT+
6
220 MM (8.7")
HCA600ACREF Schematic Diagram of HCA600ACREF Board Test Setup
TO AUDIO GENERATOR
OUTPUT END OF HCA600ACREF OUT-
ANALYZER GND TO DISTORTION ANALYZER INPUT
OUT+
AMPLIFIER LOAD RESISTOR
-+ 11 22 VV S A +- A EF CS G I I G NA LF N NN N AN OC D PP D B UL UU L TO TT E 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 12,000F + 12V TO EARTH GND + + 12V
-
120V +
+ 120V
12,000F +
-
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, 8, 500W and 4, 1000W and a fan. 5. Associated connectors and cables. 6. HCA600ACREF Amplifier Board.
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 2.2F 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.
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 7
HCA600ACREF Block Diagram of HCA600ACREF Test Setup
AUDIO PRECISION OR OTHER DISTORTION ANALYZER AUDIO PRECISION SET TO UNBALANCED GROUNDED . . . 8 LOAD RESISTOR . . . . . .
EF
AC R
+12V
+12V
200mA +-
HC
A6
00
-12V
+12V
200mA +-
A G N D
+ I N P U T
I N P U T
A G N D
12VFLT
+12V
500mA +-
+BUS (125V) 1 2 V + 1 2 V
-BUS (-125V) PGND 1kVA POWER SUPPLY (SEE BELOW) -
CAUTION: Remove power and discharge capacitors before removing or inserting the amplifier. Failure to do so may damage the module.
NOTES: 4. Differential input. input signal to - INPUT and + INPUT returned to analog ground. 5. When using + INPUT, return - INPUT to analog ground. 6. Enable may be left open since a 25A pull up current will enable the IC. The fan, CL and SFCL all may also be left open.
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HCA600ACREF Power Supply For the HCA600ACREF
D3 15A 12,000F 160V 15A D1 D4 PINS 11, 14, 18 PGND 12V +12V REG -12V 100F 16V PIN 17 12VFLT PINS 1, 4 AGND 100F 16V PIN 9 -12V PIN 10 +12V
125V NO LOAD 1kVA TRANSFORMER 92VAC 92VAC -125V NO LOAD + 12,000F 160V
PINS 12, 13 +BUS D2 PINS 15, 16 -BUS
AC INPUT
STAR GROUND 19V NO LOAD 13.6VAC 13.6VAC 19V NO LOAD + 470F 35V 470F 35V -12V REG
1A 13.6VAC 19V NO LOAD 1,000F 35V
12V REG
12VFLT
100F 25V
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.
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 (0.1F) 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. 9
+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.
HCA600ACREF
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 70oC 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. TeflonTM 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 100oC. Allowing for a temperature rise of 50 degrees above ambient, the thermal resistance of the heat sink must be approximately 1oC per watt. A fan is highly recommended. With a small fan, the existing heat sink bolted to the chassis is more than adequate.
125 mil BARS SHIELD
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 0.1F, 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
TRANSFER PLATE
PC BOARD
FIGURE 7.
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
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 0.047F 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.
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TeflonTM is a trademark of E. I. Du Pont De Nemours and Company.
HCA600ACREF
Power supply wiring is important. The wires for the +/-Bus must be kept close to their return (power ground). Twisting the cables is recommended. The bias supplies should also be kept close to their returns (AGND). Twisting is recommended. The return for the 12VFLT is the -Bus. The primary wires for the transformer should be twisted as should the secondary wires to the rectifiers. When twisting is not possible, use tie wraps. Low frequency EMI issues are usually due to radiation from the bridge rectifiers as the board itself is compliant.
Authorized Intersil Licensing Agents
Asia
Continental Far East, Inc. 3-1-5 Azabudai, Minato-ku Tokyo 106, Japan Tel: 03-3584-0339 FAX: 03-3588-0930
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site www.intersil.com
Sales Office Headquarters
NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (407) 724-7000 FAX: (407) 724-7240 EUROPE Intersil SA Mercure Center 100, Rue de la Fusee 1130 Brussels, Belgium TEL: (32) 2.724.2111 FAX: (32) 2.724.22.05 ASIA Intersil (Taiwan) Ltd. 7F-6, No. 101 Fu Hsing North Road Taipei, Taiwan Republic of China TEL: (886) 2 2716 9310 FAX: (886) 2 2715 3029
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