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Infineon Technologies IRAUDAMP8 User Manual

120w x 4 channel class d audio power amplifier using the irs2093m and irf6665
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120W x 4 Channel Class D Audio Power Amplifier
Using the IRS2093M and IRF6665
International Rectifier suggests the following guidelines for safe operation and handling of
IRAUDAMP8 Demo board;
Always wear safety glasses whenever operating Demo Board
Avoid personal contact with exposed metal surfaces when operating Demo Board
Turn off Demo Board when placing or removing measurement probes
www.irf.com
IRAUDAMP8
Jun Honda, Yasushi Nishimura and Liwei Zheng
CAUTION:
IRAUDAMP8 REV
By
1.0
Page 1 of 34

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Summary of Contents for Infineon Technologies IRAUDAMP8

  • Page 1 Using the IRS2093M and IRF6665 Jun Honda, Yasushi Nishimura and Liwei Zheng CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP8 Demo board;  Always wear safety glasses whenever operating Demo Board  Avoid personal contact with exposed metal surfaces when operating Demo Board ...

  • Page 2: Table Of Contents

    ’ ................. 12 HERMAL NTERFACE ATERIAL RESSURE ONTROL POWER SUPPLY REJECTION RATIO (PSRR).................... 14 SHORT CIRCUIT PROTECTION RESPONSE ....................15 IRAUDAMP8 OVERVIEW ..........................16 FUNCTIONAL DESCRIPTIONS........................18 IRS2093 G IC ..........................18 RIVER ........................19 SCILLATING REQUENCY ..................19 DJUSTMENTS OF...

  • Page 3: Introduction

    Introduction The IRAUDAMP8 Demo board is a reference design which uses only one IC (IRS2093M) to derive appropriate input signals, amplify the audio input, and achieve a four-channel 120 W/ch (4Ω) half-bridge Class D audio power amplifier. The reference design demonstrates how to use the IRS2093M Class D audio controller and gate driver IC, implement protection circuits, and design an optimum PCB layout using IRF6665 DirectFET MOSFETs.
  • Page 4 4ch x 120W (Rated power) At OTP shutdown @ 150 sec, =80C =25C =106C Physical Specifications Dimensions 3.94”(L) x 2.83”(W) x 0.85”(H) 100 mm (L) x 72 mm (W) x 21.5 mm(H) Weight 0.140kgm www.irf.com Page 4 of 34 IRAUDAMP8 REV...

  • Page 5: Connection Setup

    CH4 IN Analog input for CH4 SUPPLY Positive and negative supply (+B / -B) CH1 OUT Output for CH1 CH2 OUT Output for CH2 CH3 OUT Output for CH3 CH4 OUT Output for CH4 www.irf.com Page 5 of 34 IRAUDAMP8 REV...

  • Page 6: Test Procedures

    15. Observe that a 1 V input generates an output voltage of 21.2 V . The ratio, R4A/(R3A), determines the voltage gain of IRAUDAMP8. Test Setup using Audio Precision (Ap): 16. Use an unbalanced-floating signal from the generator outputs. 17. Use balanced inputs taken across output terminals, P2 and P3.

  • Page 7: Performance And Test Graphs

    100m 200m 500m CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan ±B Supply = ±35V, 4 Ω Resistive Load Fig 2 IRAUDAMP8, THD+N versus Power, Stereo, 4 Ω 100k 200k CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan ±B Supply = ±35V, 4 Ω Resistive Load Fig 3 IRAUDAMP8, Frequency response www.irf.com...
  • Page 8 0.05 0.02 0.01 0.005 0.002 0.001 0.0005 0.0002 0.0001 CH1, 10W Output Blue CH1, 50W Output Fig 4 THD+N Ratio vs. Frequency CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan Fig 5, 1V output Frequency Spectrum www.irf.com Page 8 of 34 IRAUDAMP8 REV...
  • Page 9 CH1-Blue; CH2-Yellow; CH3-Red; CH4-Cyan No signal, Self Oscillator @ 400kHz Fig 6, IRAUDAMP8 Noise Floor -100 -110 -120 CH1 – CH2, 60W Blue CH2 – CH1, 60W Fig 7, Channel separation vs. frequency www.irf.com Page 9 of 34 IRAUDAMP8 REV...

  • Page 10: Clipping Characteristics

    Clipping characteristics Red Trace: Total Distortion + Noise Voltage Green Trace: Output Voltage 60W / 4, 1kHz, THD+N=0.012% 174W / 4, 1kHz, THD+N=10% Measured Output and Distortion Waveforms Fig 8 Clipping Characteristics www.irf.com Page 10 of 34 IRAUDAMP8 REV...

  • Page 11: Efficiency

    Efficiency Fig 9 shows efficiency characteristics of the IRAUDAMP8. The high efficiency is achieved by following major factors: 1) Low conduction loss due to the DirectFETs offering low R DS(ON) 2) Low switching loss due to the DirectFETs offering low input capacitance for fast rise and...

  • Page 12: S Pressure Control

    The pressure between DirectFET & TIM (Thermal Interface Material) is controlled by depth of Heat Spreader’s groove. Choose TIM which is recommended by (Refer to AN-1035 for more details). TIM’s manufacturer thickness, conductivity, & etc. determine pressure requirement. Below shows selection options recommended: Fig 10 TIM Information www.irf.com Page 12 of 34 IRAUDAMP8 REV...
  • Page 13 Groove Depth=DirectFET’s Height +TIM’s Thickness*strain **DirectFET’s height should be measured from PCB to the top of DirectFET after reflow. The average height of IRF6665 is 0.6mm. Fig 11 compression deflection with constant rate of strain www.irf.com Page 13 of 34 IRAUDAMP8 REV...

  • Page 14: Power Supply Rejection Ratio (Psrr)

    Power Supply Rejection Ratio (PSRR) The IRAUDAMP8 obtains good power supply rejection ratio of -68 dB at 1kHz shown in Fig 12. With this high PSRR, IRAUDAMP8 accepts any power supply topology when the supply voltages fit between the min and max range.

  • Page 15: Short Circuit Protection Response

    Short Circuit Protection Response Figs 13-14 show over current protection reaction time of the IRAUDAMP8 in a short circuit event. As soon as the IRS2093 detects an over current condition, it shuts down PWM. After one second, the IRS2093 tries to resume the PWM. If the short circuit persists, the IRS2093 repeats try and fail sequences until the short circuit is removed.

  • Page 16: Iraudamp8 Overview

    IRAUDAMP8 Overview The IRAUDAMP8 features a 4CH self-oscillating type PWM modulator for the smallest space, highest performance and robust design. This topology represents an analog version of a second- order sigma-delta modulation having a Class D switching stage inside the loop. The benefit of the...
  • Page 17 A single stage output filter can be used with switching frequencies of 400 kHz and greater; a design with a lower switching frequency may require an additional stage of LPF. Fig 15 Simplified Block Diagram of IRAUDAMP8 Class D Amplifier www.irf.com Page 17 of 34...

  • Page 18: Functional Descriptions

    Functional Descriptions IRS2093 Gate Driver IC The IRAUDAMP8 uses the IRS2093, a 4 Channel high-voltage (up to 200 V), high-speed power MOSFET driver with internal dead-time and protection functions specifically designed for Class D audio amplifier applications. These functions include OCP and UVP. The IRS2093 integrates bi- directional over current protection for both high-side and low-side MOSFETs.

  • Page 19: Self-Oscillating Frequency

    Normally, when adjusting the self-oscillating frequency of the different channels, it is suggested to either match the frequencies accurately, or have them separated by at least 25kHz. Under the normal operating condition with no audio input signal, the switching-frequency is set around 400kHz in the IRAUDAMP8. www.irf.com Page 19 of 34...

  • Page 20: Selectable Dead-Time

    The dead-time of the IRS2093 is set based on the voltage applied to the DT pin. Fig 17 lists the suggested component value for each programmable dead-time between 45 and 105 ns. All the IRAUDAMP8 models use DT1 (45ns) dead-time. Dead-time Mode DT/SD Voltage <10k...

  • Page 21: Protection System Overview

    MMBT5551 LM26CIM5-XHA 4.7V MMBT5551 Fig 18 DCP, OTP, UVP and OVP Protection Circuits Fig 19 Simplified Functional Diagram of OCP www.irf.com Page 21 of 34 IRAUDAMP8 REV...
  • Page 22 UVP is provided externally to the IRS2093. UVP prevents unwanted audible noise output from unstable PWM operation during power up and down. UVP shuts down the amplifier if the bus voltage between GND and -B falls below a voltage set by Zener diode Z4. www.irf.com Page 22 of 34 IRAUDAMP8 REV...

  • Page 23: Click And Pop Noise Reduction

    100 C, the OTP shuts down all 4 channels by pulling down the CSD pins of the IRS2093. OTP recovers once the temperature has cooled down. Click and POP Noise Reduction Thanks to the click and pop elimination function built into the IRS2093, the IRAUDAMP8 does not require any additional components for this function. Power Supply Requirements For convenience, the IRAUDAMP8 has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric power supplies.
  • Page 24 3. Smaller bus capacitance (the same energy will cause a larger voltage increase) The OVP protects IRAUDAMP8 from failure in case of excessive bus pumping. One of the easiest counter measures of bus pumping is to drive both of the channels in a stereo configuration out-of- phase so that one channel consumes the energy flow from the other and does not return it to the power supply.

  • Page 25: Input Signal And Gain Setting

    Fig 21 Output Low Pass Filter and Zobel Network Gain Setting The ratio of resistors R4A~D/R1A~D in Fig 22 sets voltage gain. The IRAUDAMP8 has no on board volume control. To change the voltage gain, change the input resistor term R1A~D. Changing R4A~D affects PWM control loop design and may result poor audio performance.

  • Page 26: Schematic

    510R,1W 5.1k 220uH TC7W00FFCT-ND 2200pF,50V 100k MMBT5401 5.1k 0.01uF, 25V RON/SD FX491 3.3k 120k MMBT5551 2.2uF, 50V LM5007 0.01uF, 50V 100k 0.01uF, 50V 0.1uF, 50V 0.01uF, 50V For EMI Fig 22 IRAUDAMP8 Schematic www.irf.com Page 26 of 34 IRAUDAMP8 REV...

  • Page 27: Iraudamp8 Fabrication Materials

    IRAUDAMP8 Fabrication Materials Table 1 IRAUDAMP8 Electrical Bill of Materials Quantity Value Description Designator Part Number Vender CAP CER .1UF 50V 10% X7R Murata Electronics 0.1uF,50V 0603 490-1519-1-ND North America CAP CERAMIC 100PF 50V 100pF, 50V NP0 0603 C1A, C1B, C1C, C1D...
  • Page 28 RES 47K OHM 1/10W 5% R37, R50, R55, R56, 0603 SMD R57, R58 RHM47KGCT-ND Rohm RES 120K OHM 1/10W 5% 120k 0603 SMD RHM120KGCT-ND Rohm RES 3.3K OHM 1/10W 5% 0603 SMD 3.3k RHM3.3KGCT-ND Rohm www.irf.com Page 28 of 34 IRAUDAMP8 REV...
  • Page 29 SOD123 BZT52C18-FDICT-ND Diodes Inc DIODE ZENER 500MW 5.6V 5.6V SOD123 Z5, Z6 MMSZ5V6T1GOSCT-ND ON Semiconductor Table 2 IRAUDAMP8 Mechanical Bill of Materials Digikey Quantity Value Description Designator Vendor Lock washer 1, Lock washer 2, WASHER LOCK Lock washer 3, Lock washer 4,...

  • Page 30: Iraudamp8 Hardware

    IRAUDAMP8 Hardware IRAUDAMP8 Heat Spreader Note: All dimensions are in millimeters Tolerances are ±0.1mm All thread holes are 4-40 X 8mm dip ,minimum Material:ALUMINUM 10.5 Fig 23 Heat Spreader Screw Screw H343-ND H343-ND Thermal Pad Lock washer Lock washer Screw...

  • Page 31: Iraudamp8 Pcb Specifications

    IRAUDAMP8 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.
  • Page 32 Fig 25 IRAUDAMP8 PCB Top Overlay (Top View) www.irf.com Page 32 of 34 IRAUDAMP8 REV...
  • Page 33 Fig 26 IRAUDAMP8 PCB Bottom Layer (Top View) www.irf.com Page 33 of 34 IRAUDAMP8 REV...

  • Page 34: Revision Changes Descriptions

    Released Jan, 08 2009 Rev 1.1 ROHS Compliant (BOM Updated) May,29 2009 WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 01/29/2009 www.irf.com Page 34 of 34 IRAUDAMP8 REV...
  • Page 35 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: International Rectifier IRAUDAMP8...

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