sta5150 STMicroelectronics, sta5150 Datasheet - Page 2

• Manufacturer Part Number: sta5150
• Description: 200w Mono Bash Power Amplifier
• Manufacturer: STMicroelectronics

STA5150
DESCRIPTION (continued)
Notice that normally only one Digital Converter is needed to supply a stereo or multi-channel amplifier system,
therefore most of the functions implemented in the circuit have summing outputs
The signal circuits are biased by fixed negative and positive voltages referred to Ground. Instead the final stag-
es of the output amplifiers are supplied by two external voltages that are following the audio signal . In this way
the headroom for the output transistors is kept at minimum level to obtain a high efficiency power amplifier.
The Compressor circuits, one for each channel, performs a particular transfer behavior to avoid the dynamic
restriction that an adaptive system like this requires. To have a high flexibility the attack / release time and the
threshold levels are externally programmable. The tracking signal for the external digital converter is generated
from the Absolute Value block that rectifies the audio signal present at the compressor output. The outputs of
these blocks are decoupled by a diode to permit an easy sum of this signal for the multichannel application. The
output power bridges have a dedicated input pin to perform an AC decoupling to cancel the compressor output
DC offset. The gain of the stage is equal to 4 (+12dB). A sophisticated circuit performs the output transistor pow-
er detector that , with the digital converter, reduces the power supply voltage . Moreover, a maximum current
output limiting and the over temperature sensor have been added to protect the circuit itself. The external volt-
age applied to the STBY/MUTE pin forces the two amplifiers in the proper condition to guarantee a silent turn-
on and turn-off.
ABSOLUTE MAXIMUM RATINGS
Notes: 1. V
THERMAL DATA
2/14
R
Symbol
V
V
V
th j_case
Symbol
V
I
V
threshold
Pwr_Imp
stb-max
stbymute
V
V
V
V
Att_Rel
T
+V
In_pre
-V
CD+
CD+
CD-
CD-
j
s
s
CD-
Max Junction temperature
Thermal Resistance Junction to case
must not be more negative than -Vs and V
Positive supply voltage referred to pin 13 (GND)
Negative supply voltage referred to pin 13 (GND)
Positive supply voltage tracking rail referred to pin 13 (GND)
Positive supply voltage operated to Vs+
Negative supply voltage referred to -Vs
Negative supply voltage tracking rail referred to pin 13 (GND)
13)
GNC (pin 13)
Pin 8 Negative & Positive maximum voltage referred to GND (pin
13)
Pin 17 Negative & Positive maximum voltage referred to GND (pin
13)
Pin 11 maximum input current (Internal voltage clamp at 5V)
Pin 11 negative maximum voltage referred to GND (pin 13)
Pin 3 Negative & Positive maximum voltage reffered to GND (pin
VTrk Pin 7, 10 Negative & Positive maximum voltage referred to
Parameter
Parameter
..............................
CD+
must not be more positive than +V
(1)
(1)
..max
S
-0.5 to +0.5
-0.5 to +20
-20 to +20
-7 to +0.5
Value
Value
-0.3
-0.5
500
150
-24
0.3
-22
30
22
1
Unit
Unit
C/W
°C
V
V
V
V
V
V
V
V
V
V
V
A