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RC5502
PRODUCT SPECIFICATION
2
P
Functional Description:
The RC5502 stereo sound amplifier is an audio device that
can be used on PC motherboards and add-in sound cards. It
consists of stereo output amplifiers which can drive 4 and 8
ohm speakers without popping during power-up/power-
down, a mute control pin for disabling the power amplifiers
and internal thermal limiting circuitry.
The power amplifiers can deliver 3 watts per channel of peak
power to an 8 ohm speaker with a 12 volt power supply. This
is accomplished by using an external boot strap capacitor to
raise the internal base voltage of the output transistor. In this
application, the output voltage can swing
±
5 volts into an 8
ohm speaker load with only a 12 volt supply. The user
defines the amplifier gain so the output power level can be
optimized based on the input signal level.
To prevent turn-on speaker pop, a time delay is provided to
the power amplifiers during power-up to allow the output
voltage to settle before the amplifiers are activated. This
time constant is user defined through an external capacitor
on the SFTSTART pin.
The positive (+) input signals for both amplifiers are inter-
nally biased at approximately 6.2 volts and this sets the “AC
ground” reference level for the amplifiers. This reference
signal is connected to pin 10. This signal is internally
generated, however, an external bypass capacitor can be
connected to this pin to improve the L/R channel cross talk.
The internal thermal limiting circuitry activates if the chip
temperature typically exceeds 150
°
C.
Pin Assignments
Pin Definitions
Pin Name
PGNDL
OUTL
VCCL
MUTE
INNL
CBOOTL
VCC
GND
NC
CBYPASS
CBOOTR
INNR
VCCR
SFTSTART
OUTR
PGNDR
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Function Description
Left Amplifier ground.
Left Amplifier output.
Left Amplifier 12V power supply.
Amplifier mute. (L=Disable, H=Enable)
Left Amplifier IN.
Left Amplifier VBoot Capacitor.
12V power supply.
Ground.
No Connection.
Bypass Capacitor. (optional)
Right Amplifier VBoot Capacitor.
Right Amplifier IN.
Right Amplifier 12V Power Supply
Soft Start Timing Capacitor
Right Amplifier Output.
Right speaker ground.
65-5502-02
PGNDL
OUTL
VCCL
MUTE
INNL
CBOOTL
VCC
GND
PGNDR
OUTR
SFTSTART
VCCR
INNR
CBOOTR
CBYPASS
N/C
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RC5502