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STA550
70+70W STEREO BASH POWER AMPLIFIER
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STA550September 2002 MONOCHIP BRIDGE STEREO AMPLIFIER
FOR BASH® ARCHITECTURE 55+55W OUTPUT POWER @ RL = 4/8 Ω,
THD = 0.5% 70+70W OUTPUT POWER @ RL = 4/8 Ω,
THD = 10% HIGH DYNAMIC PREAMPLIFIER INPUT
STAGES EXTERNAL PROGRAMMABLE FEEDBACK
TYPE COMPRESSORS AC COUPLED INPUT TO CLASS AB BRIDGE
OUTPUT AMPLIFIER PRECISION RECTIFIERS TO DRIVE THE
DIGITAL CONVERTER ON-OFF SEQUENCE/ TIMER WITH MUTE
AND STANDBY PROPORTIONAL OVER POWER OUTPUT
CURRENT TO LIMIT THE DIGITAL
CONVERTER ABSOLUTE POWER BRIDGE OUTPUT
TRANSISTOR POWER PROTECTION ABSOLUTE OUTPUT CURRENT LIMIT INTEGRATED THERMAL PROTECTION POWER SUPPLY OVER VOLTAGE
PROTECTION FLEXIWATT POWER PACKAGE WITH 27 PIN
BASH® LICENCE REQUIRED
DESCRIPTIONThe STA550 is a fully integrated power module de-
signed to implement a BASH® amplifier when used
in conjunction with STABP01 digital processor.
PRODUCT PREVIEW70+70W STEREO POWER AMPLIFIER
BLOCK DIAGRAM
STA550 2/16
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 RATINGSNote 1: VCD- must not be more negative than -Vs and VCD+ must not be more positive than +VS
Note 2: All pins withstand ±2KV ESD but not pin 11
3/16
STA550
Figure 1. Connection Diagram between STA550 and STAbp01
STA550 4/16
THERMAL DATA
OPERATING RANGE
PIN CONNECTION
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STA550
PIN FUNCTION
STA550 6/16
ELECTRICAL CHARACTERISTCS (Test Condition: Vs+ = 26V, Vs- = -22V, VCD+ = 17V, VCD- = -17V, RL =8Ω, external components at the nominal value f = 1KHz, Tamb = 25°C unless otherwise specified This value is due to the thermal noise of the external resistors Rr and Ri.
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STA550
ELECTRICAL CHARACTERISTCS (continued)
STA550 8/16
FUNCTIONAL DESCRIPTIONThe circuit contains all the blocks to build a stereo amplifier. Each single channel is based on the Output Bridge
Power Amplifier, and its protection circuit. Moreover, the compression function and a signal rectifier are added
to complete the circuit.
The operation modes are driven by The Turn-on/off sequence block. In fact the IC can be set in three states by
the Stby/mute pin:
Standby ( Vpin < 0.8V), Mute (1.6V < Vpin < 3V), and Play (Vpin > 4V).
In the Standby mode all the circuits involved in the signal path are in off condition, instead
in Mute mode the circuits are biased but the Speakers Outputs are forced to ground potential.
These voltages can be get by the external RC network connected to Stby/Mute pin.
The same block is used to force quickly the I.C. In standby mode or in mute mode when the I.C. dangerous
condition has been detected. The RC network in these cases is used to delay the Normal operation restore.
The protection of the I.C. are implemented by the Over Temperature, Unbalance Ground, Output Short circuit,
Under voltage, and output transistor Power sensing as shown in the following table:
Table 1. Protection ImplementationSee the POWER PROTECTION paragraph for the details
CompressionAn other important function implemented, to avoid high power dissipation and clipping distortion, is the Com-
pression of the signal input. In fact the preamplifier stage performs a voltage gain equal to 5, fixed by Ri and Rr
external resistor, but in case of high input signal or low power supply voltage, its gain could be reduced of 26dB.
This function is obtained with a feedback type compressor that , in practice, reduces the impedance of the ex-
ternal feedback network. The behavior of compression it's internally fixed but depends from the Audio input volt-
age signal level, and from the Threshold voltage applied to the Threshold pin. The attack and release time are
programmable by the external RC network connected to the Att_Rel pins.
The constraints of the circuit in the typical application are the following:
Vthreshold range = -5 to 0
Vin peak max = 8V
Vout peak max = 10V
