FLEXIWATT27 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

FLEXIWATT27

4 X 50W STEREO BASH POWER AMPLIFIER

STMicroelectronics 

STA530

DESCRIPTION (continued)

In fact it's permits to build a BASH® architecture amplifier adding only few external components and a variable

Buck regulator tracking the audio signal. Notice that normally only one Buck regulator is used to supply a mul-

tichannel amplifiers system , therefore most of the functions implemented in the circuit have a summing output

pin.

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 circuit contains all the blocks to build a configurable four channel amplifier.

The tracking signal for the external Buck regulator is generated from the Absolute Value Block (AVB) that rec-

tifies the audio signal. The outputs of these blocks are decoupled by a diode to permit an easy sum of this signal

for the multichannel application. The gain of the stage AVB is equal to 70 (+36.9 dB). A sophisticated circuit

performs the output transistor power detector that , with the buck regulator, 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 voltage applied to the STBY/MUTE pin forces the two amplifiers in the proper condi-

tion to guarantee a silent turn-on and turn-off.

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

+Vs

Positive supply voltage referred to pin 14 (GND)

-Vs

Negative supply voltage referred to pin 14 (GND)

VCD+ Positive supply voltage tracking rail referred to pin 14 (GND)

VCD-

Negative supply voltage referred to -Vs (1)

VCD- Negative supply voltage tracking rail referred to pin 14 (GND)

VPWR_Imp1

VPWR_Imp2

VTRK_1

VTRK_2

Pin 11, 10, 9, 8 Negative & Positive maximum voltage referred to

GND (pin 14)

VPWR_Imp 3

VPWR_Imp 4

VTRK_3

VTRK_4

Pin 17, 18, 19, 20 Negative & Positive maximum voltage referred

to GND (pin 14)

ISTBY-max Pin 12 maximum input current (Internal voltage clamp at 5V)

VSTBY/

MUTE

Pin 12 negative maximum voltage referred to GND (pin 14)

Notes: 1. VCD- must not be more negative than -Vs

Value

27

-27

20

-0.3

-20

-25 to +25

-25 to +25

500

-0.5

Unit

V

V

V

V

V

V

V

µA

V

THERMAL DATA

Symbol

Parameter

Tj Max Junction temperature

Rth j_case Thermal Resistance Junction to case .............................. ..max

Value

150

1

Unit

°C

°C/W

2/17

Share Link: