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PDF CRD44800-ST-FB Data sheet ( Hoja de datos )
| Número de pieza | CRD44800-ST-FB | |
| Descripción | 60 W Full-Bridge Reference Design | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CRD44800-ST-FB
60 W Full-Bridge Reference Design for the CS44800
Features
Eight full-bridge channels, 60 W each
Programmable load compensation
Power Supply Rejection (PSR) feedback
allowing amplifier to operate from low cost
linear unregulated power supplies
Peak signal limiting
Thermal and over-current protection
> 85% amplifier efficiency
Works with GUI to configure the board or in a
standalone mode for easy operation.
Demonstrates recommended layout and
grounding arrangements
Description
The CRD44800-ST-FB PWM Amplifier demonstrates
the CS44800, Cirrus’ eight-channel pure digital PMW
controller. This reference design implements an eight-
channel amplifier which delivers 60 W per full-bridge
channel into 8 Ω loads using a single +30 V supply (at
I
10% THD+N). A 155 W Switched Mode Power Supply
(SMPS) is used to power the CRD44800-ST-FB.
As shown below, the CS44800 IC takes four stereo dig-
ital audio inputs in I²S format and converts them to PWM
outputs. This 64-pin LQFP IC provides an integrated
sample rate converter for 32 kHz-192 kHz input sample
rate support, volume up/down, speaker load compensa-
tion, peak limiting to prevent amplifier clipping, power
supply ripple compensation, and AM frequency interfer-
ence elimination.
This reference design uses the the ST Micro STA500, an
integrated power stage back end for digital amplifiers
(four STA500 parts configured as full-bridges are used
for this eight-channel design). Current limiting and ther-
mal protection are provided by the STA500.
The inductor/capacitor 2nd order low pass filter (LPF) re-
moves high frequency components from the output
signal effectively converting it from digital to analog.
ORDERING INFORMATION
CRD44800-ST-FB
Reference Design
155W Switched Mode
Power Supply
+30V/+5V
PSR Circuitry
+30V
CS4461 ADC
Audio Driver Board
I2S Clocks & Data
I2C Host Control
CS44800
(PWM Controller)
PWM Outputs
To channels 3/4
To channels 5/6
To channels 7/8
+30V
ST Micro
STA500A
LPF
LPF
Channels 1 and 2 (of 8)
8Ω
8Ω
Cirrus Logic, Inc.
www.cirrus.com
©Copyright Cirrus Logic, Inc. 2004
(All Rights Reserved)
DEC ‘04
DS632ARD1
1
1 page  
CRD44800-ST-FB
6) Connect loudspeakers to the speaker output terminals. The Red terminal is speaker positive,
and the Black terminal is speaker negative. Note that in a full-bridge system like the
CDRD44800-ST-FB, neither speaker terminal is grounded. As a result, speaker switch boxes
with common negative terminals should not be used.
Rx Lx Rs Ls S C
RL
Figure 1. Speaker Terminal Configuration
Turn the volume control fully counterclockwise and apply power using the power switch on the
power entry module. The Fault and Mute LEDs will both light briefly as the system is initialized.
Note that if either the Coax or the Optical input is selected, a valid digital signal must be provided
to the selected input so that the CRD44800-ST-FB can complete initialization. If a valid signal is
not present at the selected input, both the Fault and Mute LEDs will remain lit.
If one of the stand-alone modes is selected, the amplifiers should now be operating. Slowly ad-
vance the volume control clockwise until the desired volume is achieved. The MUTE pushbutton
(S2) may be used to mute and unmute the audio output. The RAMP UP/DN pushbutton (S3) will
enable or disable switching on the PWM back end.
Note that in the stand-alone mode, several system faults are indicated by the lighting of the red
Fault LED, D19. Typical causes for fault conditions are short circuited speaker outputs, thermal
shutoff of the power back end, or lack of a S/PDIF signal when either of the S/PDIF inputs is se-
lected.
Remote Operation
The CRD44800-ST-FB may also be operated remotely via the Cirrus FlexGUI for complete con-
trol of all the features of the CS44800. Note that the Fault and Mute LEDs operate differently in
the remote mode. They indicate the selected audio signal input as explained below. Follow the
procedure below to set up remote operation.
1) Attach the supplied power cord to the power entry module. Do not turn on the power yet.
2) Configure jumpers J17 and J18 for remote operation. Jumpers J17 and J18 should have pins
2 and 3 connected for remote operation. Jumpers J6 and J7 should be removed completely.
3) Turn on the AC power. Press the Reset button on the driver board. Select the desired audio
input source by pressing the Mute button. The following table shows the inputs selections:
Selected Input
Analog Inputs
Optical S/PDIF
Mute LED
On
Off
Fault LED
Off
On
5
5 Page 
CRD44800-ST-FB
It is extremely critical that the layout of the power amplifier section of the Cirrus Logic
CS44800 Reference Design be copied as exactly as possible to assure best RF/EMI per-
formance.
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet CRD44800-ST-FB.PDF ] | |
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