SA7454
PIN CONFIGURATION
IN2
MUTE/STBY
VCC
OUT2
PGND
OUT1
SVR
SGND
IN1
PIN DESCRIPTIONS
Pin No.
Pin Name
IN1
I/O
I
Pin Description
1
2
3
4
5
6
7
8
9
Non inverting input 1
Signal ground
SGND
SVR
--
O
O
--
O
--
I
Supply voltage ripple rejection pin
Output 1
OUT1
PGND
OUT2
VCC
Power ground
Output 2
Power supply
MUTE/STBY
IN2
Standby and mute pin
Non inverting input 2
I
FUNCTION DESCRIPTION
Stand-by and mute function
The MUTE/STBY controls the amplifier state by different voltages.
¾
¾
¾
When MUTE/STBY is 0 -2V, the amplifier is in standby mode, and the circuit is in power down mode;
When MUTE/STBY is 3.3 -6.4V, the amplifier is in mute mode;
When MUTE/STBY is higher than 8.5V, the amplifier is in operating mode.
Power Dissipation and Heat Sinking
When the load is a resistor, the maximum average power that SA7454 will be required to dissipate is
approximately:
PD(MAX)=Vs2/π2RL+PQ
Where Vs is the power supply, RL is the load resistance, PQ is the quiescent power dissipation. The above
equation is only an approximation which assume SA7454 an “ideal” class B output stage and power dissipation in
all other parts of the circuit is constant. As an example, if the SA7454 is operated on a 14.4V power supply with a
resistive load of 4Ω, it can develop up to 6W of internal power dissipation. If the die temperature is to remain
below 150°C for ambient temperatures up to 50°C, the total junction-to-ambient thermal resistance must be less
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0
2008.10.21
Page 3 of 5
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