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Cirrus-logic CRD44600-PH-FB Uživatelský manuál

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Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
Cirrus Logic, Inc.
www.cirrus.com
CRD44600-PH-FB
Stereo 100 W PWM Amplifier Reference Design
Features
z Two full-bridge channels, 100 W each
z 106 dB Dynamic Range - both channels
z 0.015% THD+N at 1 W
z Power Supply Rejection (PSR) feedback
allowing amplifier to operate from low cost
linear unregulated power supplies
z Spread Spectrum Modulation - Reduces
Modulation Energy
z Passes CISPR and FCC requirements for
radiated and power line conducted
emissions
z Independent peak signal limiting per channel
z Thermal and over-current protection
z > 85% amplifier efficiency
z Works with GUI to configure the board
z Demonstrates recommended layout and
grounding arrangements
Description
The CRD44600-PH-FB PWM Amplifier demonstrates
the CS44600, Cirrus’ multi-channel pure digital PWM
controller. This reference design implements a two-
channel amplifier which delivers 100 W per full-bridge
channel into 8 Ω loads using a single +50 V supply (at
1% THD+N). A 155 W unregulated linear power supply
is used to power the CRD44600-PH-FB.
As shown below, the CS44600 IC takes two stereo digi-
tal audio PCM inputs and converts them to PWM
outputs. This 64-pin LQFP PWM controller provides an
integrated sample rate converter for 32 kHz-192 kHz in-
put sample rate support, volume up/down, speaker load
compensation, peak limiting to prevent amplifier clipping,
power supply ripple compensation, and AM frequency
interference elimination.
This reference design uses the the Philips TDA8939, an
integrated power stage back end for digital amplifiers
(two TDA8939 parts configured as full-bridges are used
for this two-channel design). Current limiting and ther-
mal protection are provided by the TDA8939.
The inductor/capacitor 2
nd
order low pass filter (LPF) re-
moves high frequency components from the output
signal effectively converting it from digital to analog.
ORDERING INFORMATION
CRD44600-PH-FB Reference Design
I
Philips
TDA8939
CS44600
(PWM Controller)
LPF
Channel 1
+50 V
CS4461 ADC
+50 V
PSR Circuitry
Audio Inputs and GUI
Interface
155W Unregulated
Linear Power Supply
Philips
TDA8939
LPF
+50 V
Channel 2
+50 V
PCM Clocks & Data
I
2
C Host Control
8 Ω
8 Ω
MAR '05
DS633RD1
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Strany 1 - CRD44600-PH-FB

1Copyright © Cirrus Logic, Inc. 2005(All Rights Reserved)Cirrus Logic, Inc.www.cirrus.comCRD44600-PH-FBStereo 100 W PWM Amplifier Reference DesignFeat

Strany 2

CRD44600-PH-FB10 MAR '05 DS633RD14. ELECTROMAGNETIC INTERFERENCE (EMI)This reference design from Cirrus Logic is a board level solution which is

Strany 3

CRD44600-PH-FBMAR '05 DS633RD1 11and Figure 5. The power supply earth ground was connected to the board chassis groundat a single point.A CD-play

Strany 4

CRD44600-PH-FB12 MAR '05 DS633RD1 Figure 4. EMI Testing SetupFigure 5. EMI Testing Setup, Close-up

Strany 5

CRD44600-PH-FBMAR '05 DS633RD1 13 Figure 6. Radiated EMI Testing Results- 30 MHz to 200 MHzFigure 7. Radiated EMI Testing Results- 200 MHz

Strany 6

CRD44600-PH-FB14 MAR '05 DS633RD1 Figure 8. Conducted Power Line Testing Results

Strany 7

CRD44600-PH-FBMAR '05 DS633RD1 155. CRD44600-PH-FB SCHEMATICS Figure 9. Audio Inputs

Strany 8

CRD44600-PH-FB16 MAR '05 DS633RD1Figure 10. CS44600

Strany 9

CRD44600-PH-FBMAR '05 DS633RD1 17 Figure 11. PSR Feedback

Strany 10

CRD44600-PH-FB18 MAR '05 DS633RD1Figure 12. Left/Right Channels

Strany 11

CRD44600-PH-FBMAR '05 DS633RD1 19 Figure 13. Control Port and Power

Strany 12

CRD44600-PH-FB2 MAR '05 DS633RD1TABLE OF CONTENTS1. SYSTEM OVERVIEW ...

Strany 13

CRD44600-PH-FB20 MAR '05 DS633RD16. CRD44600-PH-FB POWER SUPPLY SCHEMATICS Figure 14. Power Supply

Strany 14

CRD44600-PH-FBMAR '05 DS633RD1 217. CRD44600-PH-FB LAYOUTFigure 15. Silk Screen Top

Strany 15

CRD44600-PH-FB22 MAR '05 DS633RD1Figure 16. Topside Layer

Strany 16

CRD44600-PH-FBMAR '05 DS633RD1 23Figure 17. Bottomside Layer

Strany 17

CRD44600-PH-FB24 MAR '05 DS633RD18. CRD44600-PH-FB BILL OF MATERIALS Item Description QtyReference DesignatorMFG MFG P/N1 CAP 1000pF ±5% 5

Strany 18

CRD44600-PH-FBMAR '05 DS633RD1 25Item Description QtyReference DesignatorMFG MFG P/N39 RES 22.1 OHM 1/10W ±1% 0603 FILM 12 R4 R11 R72 R73 R93 R10

Strany 19

CRD44600-PH-FB26 MAR '05 DS633RD19. TYPICAL PERFORMANCE PLOTSThese performance plots were taken with the CRD44600-PH-FB powered from the describe

Strany 20

CRD44600-PH-FBMAR '05 DS633RD1 27 0.00110.0020.0050.010.020.050.10.20.5%20 20k50 100 200 500 1k 2k 5k 10kHz50 W10 W1 WFigure 19.

Strany 21

CRD44600-PH-FB28 MAR '05 DS633RD10.01100.020.050.10.20.5125%100m 100200m 500m 1 2 5 10 20 50WFigure 20. THD+N vs. Power at 1 kHz

Strany 22

CRD44600-PH-FBMAR '05 DS633RD1 29-140+0-130-120-110-100-90-80-70-60-50-40-30-20-10dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 21. FFT at -60

Strany 23

CRD44600-PH-FBMAR '05 DS633RD1 3Table 1. Bill of Materials...

Strany 24

CRD44600-PH-FB30 MAR '05 DS633RD1-140+0-130-120-110-100-90-80-70-60-50-40-30-20-10dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 22. FFT at -1 d

Strany 25

CRD44600-PH-FBMAR '05 DS633RD1 3110. REVISION HISTORY Release Date ChangesRD1 March 2005 1st ReleaseTable 2. Revision HistoryContacting Cir

Strany 26

CRD44600-PH-FB32 MAR '05 DS633RD1

Strany 27

CRD44600-PH-FB4 MAR '05 DS633RD11. SYSTEM OVERVIEW The CRD44600-PH-FB reference design is an excellent means for evaluating the CS44600 six-chann

Strany 28

CRD44600-PH-FBMAR '05 DS633RD1 5The CS5341 converts analog audio into PCM data for the CS44600. The CS5341 operatesin slave mode and the digital

Strany 29

CRD44600-PH-FB6 MAR '05 DS633RD12. GUI CONTROLThe CRD44600-PH-FB is shipped with a Microsoft Windows® based GUI, which allows controlover the CS8

Strany 30

CRD44600-PH-FBMAR '05 DS633RD1 72.2 Advanced Register Debug TabThe Advanced Register Debug tab provides low level control over the CS44600 and CS

Strany 31

CRD44600-PH-FB8 MAR '05 DS633RD1Figure 3. Advanced Register Debug Tab - CS8416

Strany 32

CRD44600-PH-FBMAR '05 DS633RD1 93. POWER SUPPLY3.1 Power Supply RatingsThe required power supply current rating can be estimated as follows. 95 W

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