User's Manual IRAUDAMP17 R1.1 May 24

www.irf.com of 13 IRAUDAMP17 REV 1.1

IRAUDAMP17

100W/4Ω x 2 Channel Class D Audio Power Amplifier Using the IR4302

By

Jun Honda, Liwei Zheng

CAUTION:

International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP17 Demo board;

Always wear safety glasses whenever operating Demo Board Avoid physical contact with exposed metal surfaces when operating Demo

Board Turn off Demo Board when placing or removing measurement probes


TABLE OF CONTENTS........................... PAGE INTRODUCTION..............................................................................3

SPECIFICATIONS ...........................................................................3

CONNECTION SETUP ....................................................................4

TEST PROCEDURES......................................................................5

PERFORMANCE AND TEST GRAPHS ..........................................5

THERMAL INFORMATION..............................................................8

BILL OF MATERIALS ....................................................................10

PCB SPECIFICATIONS.................................................................11

REVISION CHANGES DESCRIPTIONS .......................................13


Introduction The IRAUDAMP17 reference design is a two-channel, 100W/ch (4 Ω/52V Bus voltage) half-bridge Class D audio power amplifier with single power supply. This reference design demonstrates how to use the IR4302 IC with single power supply, implement protection circuits, and design an optimum PCB layout using PowIRaudio integrated Class D IC. This reference design does not require additional heatsink or fan cooling for normal operation (one-eighth of continuous rated power).The reference design provides all the required housekeeping power supplies for ease of use. The two-channel design is scalable for power and the number of channels.

Applications

AV receivers Home theater systems Mini component stereos Powered speakers Sub-woofers Musical Instrument amplifiers Car audio amplifiers

Features Output Power: 100W x 2 channels (10%THD+N 4Ω load; with heatsink), 60W x 2 channels (10%THD+N 4Ω load; no heatsink), Multiple Protection Features: Over-current protection (OCP), high side and low side

Over-voltage protection (OVP), Under-voltage protection (UVP), high side and low side Over-temperature protection (OTP)

PWM Modulator: Self-oscillating half-bridge topology

Specifications

General Test Conditions (unless otherwise noted) Notes / Conditions 40V~52V With heatsink

Supply Voltages 30V~42V *Without heatsink

Load Impedance 2-4Ω Resistive load Self-Oscillating Frequency 400kHz No input signal, Adjustable Gain Setting 24.8dB 1Vrms input yields rated power

Electrical Data Typical Notes / Conditions IR Devices Used IR4302 PowIRaudio integrated Class D IC Modulator Self-oscillating, second order sigma-delta modulation, analog input

40V~52V Single power supply; Power Supply Range

30V~42V *Without heatsink 75W 1kHz, 4Ω load, with heatsink

Output Power CH1-2: (1% THD+N) 50W 1kHz, 4Ω load, without heatsink 100W 1kHz, 4Ω load, with heatsink

Output Power CH1-2: (10% THD+N) 60W 1kHz, 4Ω load, without heatsink

Rated Load Impedance 2-4Ω Resistive load Idling Supply Current 65mA No input signal Total Idle Power Consumption 3.4W No input signal Distortion 0.008% THD+N @ 30W, 4Ω


Residual Noise 220V IHF-A weighted, AES-17 filter Channel Efficiency 96% Single-channel driven,100W Class D

stage *Need to change components as below to achieve 30V~42V power supply voltage range without heatsink

With Heatsink Without Heatsink

Power Supply Voltage Range 40~52V 30~42V

R7~R10 390Ω 240Ω

Z5 36V 27V

Connection Setup

Fig 1 Typical Test Setup

Connector Description

Audio IN CN1 Analog input for CH1 and CH2 POWER P3 Single supply CH1 OUT P1 Output for CH1 CH2 OUT P2 Output for CH2

CN1

P1 P2P3 CH1

Output CH2

Output

Audio Input

40-52V*, 3A DC supply

4 Ohm 4 Ohm

Audio Signal Generator

IR4302

SW1

250W, Non-inductive Resistors

SW1:PWM Shutdown/MUTE

Power Indicator

FAULT Indicator

CLIP Indicator

* Without heatsink Power supply voltage range is 30~42V


Test Procedures Test Setup:

1. Connect 4, 250W load to both output connectors, P1 and P2 and audio analyzer (Ap). 2. Connect Audio Signal Generator to CN1 for CH1 and CH2 respectively (Ap). 3. Connect a single power supply to P3 pre-adjusted to 40-52V as shown on Figure above 4. Turn on the power supply. 5. Turn on SW1 (right side). 6. Blue LED (Normal) stays turning on after RED LED extinguished. 7. With an Oscilloscope, monitor switching waveform at VS of CH1 and CH2. 8. Quiescent current for the power supply should be 70mA 10mA at 52V.

Functionality Audio Tests:

9. Sweep the audio signal voltage from 15 mVRMS to 1.5 VRMS. 10. Monitor the output signals at P1/P2 with an oscilloscope. The waveform must be a non

distorted sinusoidal signal with input sinusoidal signal below 1Vrms.

Performance and Test Graphs Power vs THD+N Test Conditions:

VBus = 52V(with heatsink) Input Signal=1 kHz

Load Impedance = 4 ohms

ColorSweep Trace Line Style Thick Data Axis Comment

1 1 Blue Solid 2 Anlr.THD+N Ratio Left CH1 4ohms 52V1 3 Magenta Solid 2 Anlr.THD+N Ratio Left CH2 4ohms 52V

0.001

10

0.002

0.005

0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

%

20m 20050m 100m 200m 500m 1 2 5 10 20 50 100

W

Fig 2


Test Conditions: VBus = 42V(without heatsink) Input Signal=1 kHz



1 1 Blue Solid 2 Anlr.THD+N Ratio Left Ch1 42V 4ohms1 3 Magenta Solid 2 Anlr.THD+N Ratio Left Ch2 42V 4ohms

0.006

10

0.02

0.05

0.1

0.2

0.5

1

2

5

%

20m 10050m 100m 200m 500m 1 2 5 10 20 50

W

THD+N vs Power

Fig 3

Frequency Response Test Conditions:

VBus = 52V Set Output = 1V



1 1 Blue Solid 2 Anlr.Level A Left Ch1 52V 4ohms 1 2 Magenta Solid 2 Anlr.Level B Left Ch2 52V 4ohms

-10

+4

-8

-6

-4

-2

+0

+2

dBr A

20 200k50 100 200 500 1k 2k 5k 10k 20k 50k 100k

Hz

Fig 4


Noise Floor

Test Conditions: VBus = 52V

Load Impedance = 4 ohms No Input Signal


1 1 Blue Solid 2 Fft.Ch.1 Ampl Left Ch11 2 Magenta Solid 2 Fft.Ch.2 Ampl Left Ch2

-140

+20

-120

-100

-80

-60

-40

-20

+0

dBV

10 20k20 50 100 200 500 1k 2k 5k 10k

Hz

Noise Floor with 1Vrms Output

Test Conditions:

VBus = 52V Set Output= 1Vrms @ 1 KHz



1 1 Blue Solid 2 Fft.Ch.1 Ampl Left Ch11 2 Magenta Solid 2 Fft.Ch.2 Ampl Left Ch2

-100

+0

-80

-60

-40

-20

dBV

10 20k20 50 100 200 500 1k 2k 5k 10k

Hz

Fig5

Fig 6


Efficiency

0.0%

20.0%

40.0%

60.0%

80.0%

100.0%

0 20 40 60 80 100 120Power (W)

Eff

icie

ncy

Thermal Information: 1/8 Po Thermal Test Conditions:

Tamb=25°C natural convection cooling Both Channel Driven 1/8Po continuous 30mins Temperature measured by infrared camera

Fig 8 IRAUDAMP17 with heatsink (Vbus=52V) IR4302’s temperature saturated around 85°C within 30minutes

Fig 9 IRAUDAMP17 without heatsink (Vbus=42V)

IR4302’s temperature saturated around 82°C within 30minutes

Fig 7

*Tested with heatsink


Schematic

Fig 10

+B

VA

A

R30

4.7R

C25

0.1u

F

R41

1R

C15

1nF

C27

0.1u

F,10

0V

SCH

_DB

_430

2 R

ev1.

2

D1

+B

SD

VC

CV

SS

R31

4.7R

C26

0.1u

F

R42

1RC

171n

F

C18

10uF

,16V

C28

0.1u

F,10

0V

C6

2.2n

F,50

VC11 2.

2nF,

50V

C9

2.2n

F,50

VC14

2.2n

F,50

V

D2

1N41

48

R28

4.7R

R32

33K

D4

1N41

48

IN-2

3

CO

MP2

2

CLI

P1

NC30

VP224

VS225

GN

D5

VS1

20

CSH227

CSH116

VB1 17

IN+1

8

VN

222

NC29

VP119

VS2

23

COM 15

VS1 18

VSS

6

IN-1

9

CO

MP1

10

IN+2

4

CSD

11

FAU

LT12

NC13

VCC 14

VN

121

VB226

COM28

VA

A7

-B31

O O

IC1

IR43

02

C5

10uF

,10V

C10

10uF

,10V

R27

10K

VA

A

DS1

DS2

R26

10K

VA

A

D3

1N41

48D

5

1N41

48

R33

33K

C19

0.1u

F,50

V

R29

10K

DS3

R35

1k 1

W

1

23

MJD

44H

11T4

GQ

1

R34

9.1k

Z3 11V

CP5

22uF

+B

R40

9.1k

L1 22uH

R452.2k

R43

10, 1

WC

310.

47uF

, 400

VLC

H

D6

CT_

PGN

D

1 2

P1

D7

C33

0.1u

F, 6

3V

L2 22uH

R462.2k

R44

10, 1

WC

320.

47uF

, 400

VRC

HC

T_PG

ND

1 2

P2

C34

0.1u

F, 6

3VD9

D8

CT_

SGN

D

C12

2.2n

F,50

V

R19

180R

R24

180R

C7

2.2n

F,50

V

R22

180R

VSS

R21

180R

C13

2.2n

F,50

V

R20

180R R

23

180R

C8

2.2n

F,50

V

R1 100k

R3

330

C1

1nF

R4

330

C2

1nFR

11

*3.0

1k 1

%

R12

*3.0

1k 1

%

CT_

SGN

D

CT_

SGN

D

INPU

T G

ND

R2 100k

R5

330

C3

1nF

R6

330

C4

1nFR

13

*3.0

1k 1

%

R14

*3.0

1k 1

%

CT_

SGN

D

CT_

SGN

D

C38 22

00uF

, 63V

R4810k, 1/2W R49 10k, 1/2W

C36

0.1u

F,10

0V

+ -

C37

0.1u

F,10

0V

+B

GN

D

C39 22

00uF

, 63V

+BG

ND

1 2

P3

R53

10k

Z4 56V

Z5 *36V

R51

47k

R52

10k

R55

47k

R56

10k

R57

47k

12 3

54 6

S1 SW S

PDT

C35

0.1u

F

Q2MMBT5551

Q3MMBT5551

+B

SD

OVP

UVP

+B

GN

D

GN

D

OFF ON

CT_

SGN

DC

T_PG

ND

CT_

PGN

D

GN

D

GN

D

INPU

T G

NDR

50

10R

0C

T_PG

ND

GN

D

R9

*390

R 1

W

R8

*390

R 1

W

R10

*390

R 1

W

R7

*390

R 1

W

Z1 5.1V

GN

D

Z2 5.1V

+B

R47

NM

GN

D

+B

GN

D

GN

D

R25

47K

D10

R15

68k

1%

R16

68k

1%

R17

68k

1%

R18

68k

1%

Cla

ss D

, AM

P17

Sche

mat

ic

CP1

2.2u

F

CP2 2.

2uF

CP3 2.2u

F

CP4 2.

2uF

21 3 5 4

CN

1

C16

22uF

, 16V

C20

0.1u

F,50

V

R47

R50

Sing

le S

uppl

y

Not

mou

nted

10 O

hm

Dua

l Sup

ply

10 O

hm

Not

mou

nted

Pow

er S

uppl

yVo

ltage

Ran

ge

With

Hea

tsin

k

390o

hm

36V

With

out H

eats

ink

240

Ohm

27V

40-5

2V30

-42V

R7,R

8,R9

,R10

Z5

*


Bill of Materials

No Digikey P/N Designator Description Quantity Vender

1 399-1082-1-ND C1, C2, C3, C4, C15, C17 CAP CER 1000PF 50V 10% X7R 0603 6 Digikey

2 587-2668-1-ND C5, C10 CAP CER 10UF 10V 10% X7R 0805 2 Digikey

3 490-1500-1-ND C6, C7, C8, C9, C11, C12, C13, C14 CAP CER 2200PF 50V 10% X7R 0603 8 Digikey

4 587-1433-1-ND C16 CAP CER 22UF 16V 20% X5R 1206 1 Digikey

5 490-5519-1-ND C18 CAP CER 10UF 16V 10% X6S 0805 1 Digikey

6 311-1140-1-ND C19, C20 CAP CER 0.1UF 50V 10% X7R 0805 2 Digikey

7 445-1418-1-ND C25, C26 CAP CER 0.1UF 100V 10% X7R 0805 2 Digikey

8 445-1377-1-ND C27, C28, C36, C37 CAP CER 0.1UF 100V 10% X7R 1206 4 Digikey

9 495-1315-ND C31, C32 CAP FILM 0.47UF 400VDC RADIAL 2 Digikey

10 BC2054-ND C33, C34 CAP FILM 0.1UF 63VDC RADIAL 2 Digikey

11 445-1418-1-ND C35 CAP CER 0.1UF 100V 10% X7R 0805 1 Digikey

12 565-1137-ND C38, C39 CAP ALUM 2200UF 63V 20% RADIAL 2 Digikey

13 CP1-3545N-ND CN1 CONN JACK STEREO R/A 5PIN 3.5MM 1 Digikey

14 565-1103-ND CP1, CP2, CP3, CP4 CAP ALUM 2.2UF 50V 20% RADIAL 4 Digikey

15 565-1056-ND CP5 CAP ALUM 22UF 25V 20% RADIAL 1 Digikey

16 1N4148W-FDICT-ND D1, D2, D3, D4, D5, D10 DIODE SWITCH 100V 400MW SOD123 6 Digikey

17 DFLU1200-7DICT-ND D6, D7, D8, D9 DIODE ULTRA FAST POWERDI 123 4 Digikey

18 160-1181-1-ND DS1 LED RED CLEAR 0603 SMD 1 Digikey

19 160-1183-1-ND DS2 LED GREEN CLEAR 0603 SMD 1 Digikey

20 160-1646-1-ND DS3 LED BLUE CLEAR 0603 SMD 1 Digikey

21 IR4302 IC1 2 CH PowIRaudio integrated Class D IC 1 IR

22 Sagami 7G17A-220M-R L1, L2 Power Inductors Class D Inductor 22uH 2 Inductors, Inc

23 281-1414-ND P1, P2, P3 CONN TERM BLOCK PCB 5.0MM 2POS 3 Digikey

24 MJD44H11T4GOSCT-ND Q1 TRANS PWR NPN 8A 80V DPAK 1 Digikey

25 MMBT5551FSCT-ND Q2, Q3 TRANSISTOR NPN 160V SOT-23 2 Digikey

26 RMCF0603JT100KCT-ND R1, R2 RES 100K OHM 1/10W 5% 0603 SMD 2 Digikey

27 RMCF0603JT330RCT-ND R3, R4, R5, R6 RES 330 OHM 1/10W 5% 0603 SMD 4 Digikey

28 RMCF2512JT390RCT-ND R7, R8, R9, R10 RES 390 OHM 1W 5% 2512 SMD 4 Digikey

29 RHM3.01KCRCT-ND R11, R12, R13, R14 RES 3.01K OHM 1/8W 1% 0805 SMD 4 Digikey

30 311-68.0KCRCT-ND R15, R16, R17, R18 RES 68.0K OHM 1/8W 1% 0805 SMD 4 Digikey

31 RHM180GCT-ND R19, R20, R21, R22, R23, R24 RES 180 OHM 1/10W 5% 0603 SMD 6 Digikey

32 RHM47KGCT-ND R25 RES 47K OHM 1/10W 5% 0603 SMD 1 Digikey

33 RHM10KGCT-ND R26, R27, R29 RES 10K OHM 1/10W 5% 0603 SMD 3 Digikey

34 RMCF0603JT4R70CT-ND R28, R30, R31 RES TF 1/10W 4.7 OHM 5% 0603 3 Digikey

35 RHM33KGCT-ND R32, R33 RES 33K OHM 1/10W 5% 0603 SMD 2 Digikey

36 RHM9.1KARCT-ND R34, R40 RES 9.1K OHM 1/8W 5% 0805 SMD 2 Digikey

37 PT1.0KXCT-ND R35 RES 1.0K OHM 1W 5% 2512 SMD 1 Digikey

38 P1.0ACT-ND R41, R42 RESISTOR 1.0 OHM 1/8W 5% 0805 2 Digikey

39 541-10.0AFCT-ND R43, R44 RES 10.0 OHM 1W 1% 2512 SMD 2 Digikey

40 RMCF0805JT2K20CT-ND R45, R46 RES 2.2K OHM 1/8W 5% 0805 SMD 2 Digikey

41 541-10KVCT-ND R48, R49 RES 10K OHM 1/2W 5% 1210 SMD 2 Digikey

42 311-10ARCT-ND R50 RES 10 OHM 1/8W 5% 0805 SMD 1 Digikey

43 RHM47KARCT-ND R51, R55, R57 RES 47K OHM 1/8W 5% 0805 SMD 3 Digikey


44 RHM10KARCT-ND R52, R53, R56 RES 10K OHM 1/8W 5% 0805 SMD 3 Digikey

45 360-1758-ND S1 SWITCH TOGGLE SPDT .4VA SEAL PCB 1 Digikey

46 DDZ5V1BDICT-ND Z1, Z2 DIODE ZENER 5.1V 500MW SOD-123 2 Digikey

47 BZT52C11-FDICT-ND Z3 DIODE ZENER 11V 500MW SOD123 1 Digikey

48 MMSZ5263BT1GOSCT-ND Z4 DIODE ZENER 56V 500MW SOD-123 1 Digikey

49 BZT52C36-FDICT-ND Z5 DIODE ZENER 36V 500MW SOD-123 1 Digikey

50 8401K-ND 1/2" Standoffs 4-40 STDOFF HEX M/F 4-40 .500"L ALUM 4 Digikey

51 H724-ND 4-40 Nut NUT HEX 4-40 STAINLESS STEEL 4 Digikey

52 H729-ND No. 4 Lock Washer WASHER LOCK INTERNAL #4 SS 4 Digikey

53 BER161-ND Thermal Pad THERMAL PAD .020" 4X4" GAPPAD 1/6 Digikey

IRAUDAMP17 Heatsink

Fig11

PCB Specifications PCB:

1. Two Layers SMT PCB with through holes 2. 1/16 thickness 3. 2/0 OZ Cu 4. FR4 material 5. 10 mil lines and spaces 6. Solder Mask to be Green enamel EMP110 DBG (CARAPACE) or Enthone Endplate

DSR-3241or equivalent. 7. Silk Screen to be white epoxy non conductive per IPC–RB 276 Standard. 8. All exposed copper must finished with TIN-LEAD Sn 60 or 63 for 100u inches thick. 9. Tolerance of PCB size shall be 0.010 –0.000 inches 10. Tolerance of all Holes is -.000 + 0.003” 11. PCB acceptance criteria as defined for class II PCB’S standards.


PCB Layout Top side:

Bottom side:

Note: Refer to AN1170 for footprint and board mounting details.

Fig 12

Fig 13


Revision changes descriptions

Revision Changes description Date Rev 1.0 Released May, 16 2012 Rev 1.1 BOM R50=10ohm May, 24 2012

WORLD HEADQUARTERS: 101 N. Sepulveda Blvd., El Segundo, California 90245 Tel: (310) 252-7105

Data and specifications subject to change without notice. 05/16/2012

User's Manual IRAUDAMP17 R1.1 May 24

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