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S E M I C O N D U C T O R

1

November 1997

HIP200ACREF 200W Class D Subwoofer Amplifier

Features

• 200 Watt RMS Power (400 Watt Peak)

• Operation from a Single Supply

• Meets FCC Class B and CE Mark Requirements for

EMC

• 10-450Hz Bandwidth (3dB) †

• 0.1% THD

• Greater than 90% Efficiency at Max Power

• Pop-Free Start-Up

• Remote On/Off

• Soft Clipping

• Overcurrent and Thermal Protection

Applications

• Subwoofer Amplifiers

Ordering Information

Contact Harris licensing agents, Continental Far East or

International Operations. See contact information provided

in this document.

† Bandwidth can be customized through component change.

Contact Harris Intelligent Power for further information.

Description

The HIP200ACREF Reference

Design delivers 200WRMSpower into a 2Ω load with less than 0.1% THD. The amplifier

will run continuously at rated power with no droop in output

level. Since the efficiency is 90% at maximum power, no

expensive, bulky heatsinks are required.

The design is part of Harris’ Cool Audio program that

enables customers to achieve a minimum time-to-market for

audio end products. This design is offered to Customers

after execution of a Licensing Agreement. At this time,

Harris provides a documentation package containing 1)

Circuit Description, 2) Schematics, 3) Test and Manufactur-

ing Information, 4) A Bill of Material with all vendor and

vendor part numbers, 5) Harris’ Engineering Support Con-tacts, 6) One Sample Amplifier Board.

For more information, see us on the web, home page

http://www.semi.harris.com. For technical assistance, call

Central Applications at 1-800-442-7747, or email us at

[email protected].

Reference Design Block Diagram

LOW PASS FILTER (400HZ)

POWER

EN

+DC

-DC

200W SUBWOOFER

+15V

PRE-AMPLIFIER

OVER CURRENT

SOFT CLIPPING

LOW PASS

FILTER

AMPLIFIER

FILTER

LOW PASS

+OUT

-OUT

THERMAL SHUTDOWN

MODULATOR

J1

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Copyright © Harris Corporation 1997

CoolAudio™ is a trademark of Harris Corporation.

File Number 4272.1

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Absolute Maximum Ratings Operating Conditions

Supply Voltage, VBUS (Note 1). . . . . . . . . . . . . . . . . . . -0.3V to 36V

All Other Pin Voltages (Note 1). . . . . . . .VGND -0.3V to VBUS +0.3V

Supply Voltage, VBUS (Relative to GND) . . . . . . . . . . . +32V (+4 -2)

Voltage on VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V

Temperature Range (Amplifier Ambient). . . . . . . . . . .-40oC to 60oC

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.

NOTES:

1. All voltages are relative to VGND, unless otherwise specified.2. θJA is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications VBUS = 32V, RLOAD = 1.99Ω, VCOM = 0V

PARAMETER SYMBOL TEST CONDITIONS

TA = 25oC

UNITSTYP

SUPPLY MEASUREMENTS

+15V Current Quiescent - Switching VBIAS = 12V, REM = VBIAS 130 mA

+15V Current Quiescent - Non Switching VBIAS = 12V, REM = VCOM = 0V 54 mA

VBUS Quiescent Current IBUS Audio In = 0V, REM = VBIAS 200 mA

REM On/OFF Quiescent Current (On) REN 100 kΩ

VBIAS Idle Current IBIASIDLE Audio In = 0V, REM = VCOM = 0V 0.10 mAMinimum 15V Input Supply Voltage 13.5 V

Maximum +15V Input Supply Voltage 20 V

OUTPUT MEASUREMENTS (All In RMS)

Maximum Output Power at 32V PMAX VBUS = 32V 200 W

Efficiency PMAXEFF VBUS = 32V, POUT = 20W 78 %

PMAXEFF VBUS = 32V, POUT = 50W 85 %



PERFORMANCE MEASUREMENTS

Total Harmonic Distortion + Noise THD+N POUT = 100W, 100Hz 0.1 %

SNR VSNR Relative to Full Scale Output, ≤ 5kHz -85 dB

PSRR (∆VOUT / ∆VBUS) PSRR VBUS = 32±10% 3 mV/V

ADDITIONAL MEASUREMENTS

Cutoff Frequency FUPPER -3dB (Note 3) 450 Hz

PWM Frequency FPWM 68 kHz

Amplifier Gain AV 23 dB

Input Impedance RIN 10 KΩ

NOTE:

3. Can be tailored, contact Harris intelligent Power Applications.

Reference Board Connector Assignment

SYMBOL DESCRIPTION

EN Remote on/off signal for the amplifier.

+DC Amplifier output stage power source.

+OUT The + polarity high power output.

-OUT The -polarity high power output.

+15 Logic supply voltage = 15VDC.

-DC Ground return for the amplifier.

J1 Audio input from Preamp.

HIP200ACREF

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Typical Performance Curves

NOTE: The above curve shows the frequency response from 20Hz

to 800Hz at 200W output power. Note that the response is ±3dB from

10Hz -450Hz.

FIGURE 1. AMPLITUDE vs FREQUENCY

NOTE: The above curve is THD+N% vs Frequency at 100W.

FIGURE 2. THD vs FREQUENCY

NOTE: THD+N% increases below 50Hz and above 150Hz because the input filter begins to attenuate the Audio Precision input signals atthese points. See Figure 1 above.

FIGURE 3. PERCENT THD+N vs OUTPUT POWER (100Hz), WITHOUT COMPRESSION

24

22

20

18

16

140 100 1K

A M P L I T U D E ( D B r )

FREQUENCY (Hz)

0.1

1

0.0110 100 1K

% T H D + N

FREQUENCY (Hz)

0.01

0.1

0 150 200

% T H D + N

OUTPUT POWER (W)

10050

HIP200ACREF

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Reference Board Physical Layouts

FIGURE 4. AMPLIFIER BOARD CONNECTIONS

AUDIO INPUT (RCA JACK)

JP3

JP2

J1

PIN 1 = +OUT

PIN 2 = - OUT

PIN 1 = +30V SUPPLYPIN 2 = +15V SUPPLY

PIN 4 = REMOTE

PIN 3 = COMMON GROUND

5.90”

4.35”

HIP200ACREF

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Evaluation Test Procedure

HIP200ACREF Consumer Subwoofer Amplifier.

Equipment

Test equipment required for proper evaluation of the 200W

Harris Subwoofer Amplifier are as follows:

Two Regulated DC Power Supplies will be needed for test-

ing. A high power supply with clean output and capable ofsupplying a constant 32VDC at 8A minimum continuously;

and a lower voltage supply capable of providing 15V continu-

ously at 300mA. A power supply with the current limit set to

those specified above is recommended. For power supplies

which do not read the current limit set-point directly, the posi-

tion of the set point control corresponding to the appropriate

current levels should be determined prior to starting the test

and marked on the power supply control panel.

Audio Precision System 1 Analyzer or equivalent, capable of

providing clean audio input signals controllable in amplitude

from 0V to 500mV and frequencies from 15Hz to 1kHz. The

system should also be capable of analyzing amplifier

characteristics, Output Power, Frequency Response, TotalHarmonic Distortion, and Noise. An output low pass filter will

be needed to filter out the switching waveform components

resulting from class D amplification. This filter can be made

from the schematic shown in Figure 5. The filters corner

frequency is approximately 10kHz and therefore, is sufficient

for analyzing subwoofer amplifiers, but not full range units.

A 2Ω non-inductive resistive load capable of handling a

minimum of 200W.

Procedure

1. Connect a shielded cable between the Audio Precision

Analyzer signal output port and the RCA jack on the am-

plifier. Connect a #16AWG twisted pair cable betweenplug, JP2, and the 2.0Ω resistor set. Connect suitable

wires between plug, JP3, on the amplifier and the 15 and

32VDC supplies using #16AWG twisted wire for GND and

32VDC and #22AWG for 15VDC and EN signals. Set the

output voltages for the supplies to 15V and 32V, before

connecting cables at the amplifier side. Preset the current

limit settings of the 15VDC supply to 300mA and the # at

VDC supply to about 10ADC.

2. With the power supplies off, plug the J1, JP2 and JP3 ex-

ternal connectors into the appropriate ports on the ampli-

fier board. Make sure the board is sitting on a non

conductive surface prior to powering up. The switch con-

trolling the remote EN(able) pin should be in the off(open) position.

3. With the audio input signal set at 0mV, turn on the 15V

power supply followed by the 32V supply. The indicated

current from the 32VDC supply should be zero and for the

15VDC supply near 60mA. Next, turn on the remote on/off

control switch. The 15VDC supply current should increase

to no more than 150mA. The 32VDC power supply current

with no input signal should be approximately 250mA.

4. If the amplifier output is connected to a resistive load, 2Ω,

200W resistor, make sure the resistor is placed in a safe

position since it will get very hot during the evaluation test.

5. Depending on the type of testing to be conducted (Output

Power, THDs etc.) select the menu and control panel set-

tings on the Audio Precision Analyzer to conduct the test.

Input frequency should be set between 10Hz and 800Hzand input voltage level should be increased slowly until de-

sired output power is achieved. At 200W output power, the

32VDC bus power supply current should be approaching

8A.

6. Conduct the desired tests in accordance with the Audio

Precision test procedures.

7. Power down audio signal input and power supplies before

disconnecting the amplifier from the test set up.

Expected Test Results

The Harris 200W Consumer Subwoofer Amplifier is

designed to provide 200W rms output power into 2Ω speakerload with THD+N as shown under Electrical Specifications in

this data sheet. As the amplifier output power approaches

200W, the output voltage swing approaches the limits of the

supply voltage (32V) and the output waveform will begin to

soft-clip, resulting in a rapid increase in THD.

The onset of soft-clipping can be viewed by looking at test

point TP1 with an oscilloscope probe with respect to a suit-

able ground on the amplifier board. A noticeable flattening of

the signal will occur as the input amplitude is increased fur-

ther and further with jumper JP4 in the circuit. With JP4

pulled, compression is disabled.

The short-circuit shutdown circuit can be tested by simply

shorting the 2Ω output resistors with a suitable means. Nearinstant disabling of the amplifier should be noticed. To reset

the amplifier, remove the short circuit and then toggle the EN

voltage to GND then back to the +15VDC supply potential.

2Ω200WNI LOAD

(NOTE 8)0.15µF

100Ω, 1W, 1%

+OUT

-OUT

TOA/PINPUT

100Ω, 1W, 1%

JP2

HIP200ACREF

NOTE:

8. Use polypropylene filter capacitors only.

FIGURE 5. FILTER CIRCUIT FOR USE WITH AUDIO PRECISION

ANALYZER AND RESISTIVE LOADS

HIP200ACREF

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All Harris Semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.

Harris Semiconductor products are sold by description only. Harris Semiconductor 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 Harris is

believed to be accurate and reliable. However, no responsibility is assumed by Harris or its subsidiaries for its use; nor for any infringements of patents or other

rights of third part ies which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Harris or its subsidiaries.

Sales Office Headquarters For general information regarding Harris Semiconductor and its products, call 1-800-4-HARRIS

NORTH AMERICA

Harris Semiconductor

P. O. Box 883, Mail Stop 53-210

Melbourne, FL 32902

TEL: 1-800-442-7747

(407) 729-4984

FAX: (407) 729-5321

EUROPE

Harris Semiconductor

Mercure Center

100, Rue de la Fusee

1130 Brussels, Belgium

TEL: (32) 2.724.2111

FAX: (32) 2.724.22.05

ASIA

Harris Semiconductor PTE Ltd.

No. 1 Tannery Road

Cencon 1, #09-01

Singapore 1334

TEL: (65) 748-4200

FAX: (65) 748-0400

S E M I C O N D U C T O R

Authorized Harris Licensing Agents

ASIA

Continental Far East, Inc.

3-1-5 Azabudai, Minato-ku

Tokyo 106, Japan

Tel: 03-3584-0339

FAX: 03-3588-0930

NORTH AMERICA and EUROPE

International Operations, Inc.

15 Oakdale Manor

Suffern, New York 10901

USA

Tel: 914-369-3532

FAX: 914-369-1607

HIP200ACREF

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