SGS Thomson Microelectronics STA5100 Datasheet

140W MONO POWER AMP LI F IER

■

MONOCHIP BRIDGE MONO AMPLIFIER FOR

BASH

■

110W OUTPUT POWER @ RL = 4 THD = 0.5%

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140W OUTPUT POWER @ RL = 4 THD = 10%

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HIGH DYNAMIC PREAMPLIFIER INPUT STAGES

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EXTERNAL PROGRAMMABLE FEEDBACK TYPE COMPRESSORS

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AC COUPLED INPUT TO CLASS AB BRID G E OUTPUT AMPLIFIER

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PRECISION RECTIFIERS TO DRIVE THE DIGITAL CONVERTER

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ON-OFF SEQUENCE/ TIMER WITH MUTE AND STANDBY

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PROPORTIONAL OVER POWER OUTPUT CURRENT TO LIMIT THE DIGITAL CONVERTER

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ABSOLUTE POWER BRIDGE OUTPUT

ARCHITECTURE

Ω,

STA5100

FLEXIWATT27

TRANSISTOR POWER PROTECTION

■

ABSOLUTE OUTPUT CURRENT LIMIT

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INTEGRATED THERMAL PROTECTION

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POWER SUPPLY OVER VOLTAGE PROTECTION

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FLEXIWATT POW ER PAC KAG E WI TH 2 7 PIN

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BASH® licence required

DESCRIPTION

The STA5100 is a fully integrated power module designed to implement a BASH® amplifier when used in conjunction with STABP01 digital processor.

BLOCK DIAGRAM

IN_PRE

ATT_REL

THRESH

TRK_OUT

COMPRESSOR

V/l

Ict

-VSGND+VS

∆G

PEAK

DETECTOR

ABSOLUTE

VALUE BLOCK

PWR_INPTRKOUT_ PRE

OUTPUT BRIDGE

SOA

OVER

VOLTAGE

PROTECTION

THERMAL

PROTECTION

DETECTOR

TURN-

ON/OFF

SEQUENCE

-1

OUTPUT BRIDGE CD-N

CD+P OUTP

-1

D01AU1280

OUTP

CD-P

CD+

PROT.

STBY/MUTE

CD+N OUTN

OUTN

July 2003

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STA5100

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 bias ed by fixed negative and posi tive voltages r eferred to Ground. Instead the final stages 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 exter nal ly progr ammable. The tracking s ignal for the ex ter nal digita l 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 mult ichannel 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 sophis ticated circuit performs the output transistor power 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 voltage applied to the STBY/MUTE pin forces the two amplifiers in the proper condition to guarantee a silent turnon and turn-off.

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

-V

Positive supply voltage referred to pin 13 (GND) 30 V

Negative supply voltage referred to pin 13 (GND) -24 V

CD+

V V

Att_Rel

CD-

Positive supply voltage tracking rail referred to pin 13 (GND) 22 V

Positive supply voltage operated to Vs+ Negative supply voltage referred to -Vs

(1)

0.3 V

-0.3 V

Negative supply voltage tracking rail referred to pin 13 (GND) -22 V Pin 3 Negative & Positive maximum voltage reffered to GND (pin

-0.5 to +20 V

13)

Pwr_Imp

VTrk Pin 7, 10 Negative & Positive maximum voltage referred to

-20 to +20 V

GNC (pin 13)

In_pre

Pin 8 Negative & Positive maximum voltage referred to GND (pin

-0.5 to +0.5 V

13)

threshold

Pin 17 Negative & Positive maximum voltage referred to GND

-7 to +0.5 V

(pin 13)

stb-max

stbymute

Notes: 1. V

Pin 11 maximum input current (Internal voltage clamp at 5V) 500 µA Pin 11 negative maximum voltage referred to GND (pin 13) -0.5 V

must not be m ore negativ e than -Vs and V

CD-

must not be more positive than +V

CD+

THERMAL DATA

Symbol Parameter Value Unit

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th j_case

Max Junction temperature 150 °C

Thermal Resistance Junction to case .............................. ..max 1 °C/W

STA5100

OPERATING RANGE

Symbol Parameter Value Unit

-V

∆V

CD+

CD-

in_Max

trheshold

amb

sb_max

Positive supply voltage +20 to +30 V

Negative supply voltage -10 to -22 V

Delta positive supply voltage 5V ≤ (Vs+ - VCD+) ≤ 10V V

Positive supply voltage tracking rail +3 to +17 V Negative supply voltage tracking rail -3 to -17 V Current at pin In_Pre related to compressor behaviour -1 to +1 mA peak Voltage at pin Threshold -5 to 0 V Ambient Temperature Range 0 to 70 °C Pin 11 maximum input current (Internal voltage clmp at 5V) 200 µA

PIN CONNECTION

N.C.

CD-N

D01AU1281

-Vs

-V CD-P

ATT-REL

OUTP

CD+P

PWR_INP

IN_PRE

OUT_PRE

TRK

STBY/MUTE

CD+

GND

PROTECTION

TRK_OUT

THRESHOLD

N.C.

CD+N

OUTN

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STA5100

PIN FUNCTION

N° Name Description

1 -Vs Negative Bias Supply 2 CD-P Channel P Time varying tracking rail negative power supply 3 Att_Rel Attack release rate 4 OutP Channel P 5 OutP Channel P 6 CD+P Channel P positive power supply 7 Pwr_Inp Input to power stage 8 In_pre Pre-amp input (virtual ground)

9 Out_pre Output channel 10 Trk Absolute value block input 11 Stby/mute Standby/mute input voltage control 12 Protection Protection signal for STABP01 digital processor 13 Gnd Analog Ground 14 +Vs Positive Bias Supply 15 CD+ Time varying tracking rail positive power supply 16 Trk_out Reference output for STABP01 digital processor 17 Threshold Compressor threshold input 18 N.C. 19 N.C. 20 N.C. 21 N.C. 22 CD+N Channel N positive power supply 23 OutN Channel N 24 OutN Channel N 25 N.C. 26 CD-N Channel N Time varying tracking rail negative power supply 27 -Vs Negative Bias Supply

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STA5100

ELECTRICAL CHARACTERISTCS

= 4Ω, external components at the nominal value f = 1KHz, Tamb = 25°C unless otherwise specified

(Test Condition: Vs+ = 26V, Vs- = -22V, V

= 17V, V

CD+

= -17V,

CD-

Symbol Parameter Test Condition Min. Typ. Max. Unit

PREAMPLIFIER AND COMPRESSOR

out clamp

control

Voffset Output Offset at Out_pre pin with: V

THD Distortion at Out_pre: V

Maximum Voltage at Out_pre pin 10 11 12 Vpeak

Audio input current 0.8 mA

Voltage at Attack_Release pin Attenuation = 0dB

Attenuation = 6dB Attenuation = 26dB

Input voltage range for the

omp_ Th

compression

Input impedance of Threshold pin 100 KΩ

= 0V; Attenuation = 0dB

CRT

= 0.5V; Attenuation = 6dB

CRT

= 9V;

Attenuation = 26dB

= 0V; Attenuation = 0dB = 0.5V; Attenuation = 6dB = 9V;

Attenuation = 26dB

= 0V; Attenuation = 0dB = 0.5V; Attenuation = 6dB = 9V;

Attenuation = 26dB

EN Noise at Out_pre pin : V

V V

CRT

CRT CRT CRT

0.35 6

-5 -1 V

-10

-250

-450

0.5 9

0.01

50 60

(2)

0.65 12

250 450

5 5

V V V

mV mV mV

% % %

µV µV µV

Attack time current at pin

Attack_release

2. This value is due to the thermal noise of the external resistors Rr and Ri.

TRACKING PARAMETERS

trk_out

Tracking reference voltage gain 13 14 15 V

trk

Tracking ref. output voltage 0 20 V Current capability 5 6 7 mA Input impedance (Trk)1MΩ

trk_in

OUTPUT BRIDGE

∆G

Half Output bridge gain 5.5 6 6.5 dB

out

Output bridge differential gain 11 12 13 dB

Output bridges gain mismatch -1 1 dB

Continuous Output Power THD = 0.5%

out

THD = 10%

THD Total harmonic distortion of the

Po = 5W 0.01 %

output bridge

f = 20Hz to 20KHz; Po = 50W 0.1 %

Output bridge D.C. offset 50 mV

Off

100 125

1.5 mA

110 140

W W

Noise at Output bridge pins f = 20Hz to 20KHz; Rg = 50Ω 12 µV Input impedance 100 140 180 KΩ

br_in

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