SGS Thomson Microelectronics STA575 Datasheet
100+100W STEREO POWER AMPLIFIER
■
MONOCHIP BRIDGE STEREO AMPLIFIER
ON BASH
■
80+80W OUTPUT POWER @ RL = 4/8
THD = 0.5%
■
100+100W OUTPUT POWER @ RL = 4/8
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
®
ARCHITECTURE
Ω,
Ω,
STA575
FLEXIWATT27
TRANSISTOR POWER PROTECTION
■
ABSOLUTE OUTPUT CURRENT LIMIT
■
INTEGRATED THERMAL PROTECTION
■
POWER SUPPLY OVER VOLTAGE
PROTECTION
■
FLEXIWATT POW ER PAC KAG E WI TH 2 7 PIN
■
BASH® LICENCE REQUIRED
DESCRIPTION
The STA575 is a fully integrated power module designed to implement a BASH® amplifier when used
in conjunction with STABP01 digital processor.
BLOCK DIAGRAM
July 2003
IN_PRE1
ATT_REL1
TRK_OUT
THRESH
ATT_REL2
IN_PRE2
COMPRESSOR
V/l
S1
Ict
Ict
S1
V/l
COMPRESSOR
-VSGND+VS
+
-
PEAK/2
DETECTOR
PEAK/2
DETECTOR
-
+
PWR_INP1TRK_1OUT_ PRE1
ABSOLUTE
VALUE
BLOCK
∆G
∆G
ABSOLUTE
VALUE
BLOCK
TRK_2OUT_ PRE2
+2
OUTPUT BRIDGE
SOA
VOLTAGE
PROTECTION
THERMAL
PROTECTION
PWR_INP2
DETECTOR
TURN-
ON/OFF
SEQUENCE
+2
OUTPUT BRIDGE CD-2
-1
-1
D01AU1263
CD+1
OUT1+
OUT1-
CD-1
CD+
PROT.
STBY/MUTE
CD+2
OUT2+
OUT2-
1/20
STA575
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
s
-V
V
CD+
V
CD+
V
CD-
V
CD-
V
Att_Rel1
V
Att_Rel2
V
Pwr_Imp1
V
Pwr_Imp2
V
Trk_1
V
Trk_2
V
In_pre1
V
In_pre2
V
threshold
Negative supply voltage referred to pin 13 (GND) -24 V
s
Positive supply voltage tracking rail referred to pin 13 (GND) 22 V
Positive supply voltage operated to Vs+
Negative supply voltage referred to -Vs
Negative supply voltage tracking rail referred to pin 13 (GND) -22 V
Pin 3, 25 Negative & Positive maximum voltage referred to GND
(pin 13)
Pin 7, 21, 18, 10 Negative & Positive maximum voltage referred to
GND (pin 13)
Pin 8, 20 Negative & Positive maximum voltage referred to GND
(pin 13)
Pin 17 Negative & Positive maximum voltage referred to GND (pin
13)
I
stb-max
V
stbymute
I
out
Note 1: V
Note 2: All pin s wi t h s tand ±2KV ESD but not pin 11
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
Output current 7.7 A
must not be more negative than -Vs and V
CD-
(1)
(1)
must not be more positive than +V
CD+
0.3 V
-0.3 V
-0.5 to +20 V
-20 to +20 V
-0.5 to +0.5 V
-7 to +0.5 V
S
2/20
STA575
THERMAL DATA
Symbol Parameter Value Unit
T
Max Junction temperature 150 °C
j
R
th j_case
Thermal Resistance Junction to case .............................. ..max 1 °C/W
OPERATING RANGE
Symbol Parameter Value Unit
+V
-V
∆V
V
CD+
V
CD-
I
in_Max
V
trheshold
T
amb
I
sb_max
Positive supply voltage +20 to +28 V
s
Negative supply voltage -10 to -23 V
s
Delta positive supply voltage 5V ≤ (Vs+ - VCD+) ≤ 10V V
s+
Positive supply voltage tracking rail +3 to 20.7 V
Negative supply voltage tracking rail -20.7 to -3 V
Current at pin In_Pre1, In_Pre2, 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
1
S
-V
CD-1
Note: Slug c onnected to pi ns n. 1 and 27
OUT1+
ATT-REL1
OUT1-
CD+1
PWR_INP1
IN_PRE1
OUT_PRE1
TRK_1
STBY/MUTE
S
+V
CD+
GND
PROTECTION
TRK_OUT
THRESHOLD
TRK_2
OUT_PRE2
IN_PRE2
PWR_INP2
CD+2
OUT2-
OUT2+
27
CD-2
ATT_REL2
D01AU1251
-Vs
3/20
STA575
PIN FUNCTION
N° Name Description
1 - Vs Negative Bias Supply
2 CD-1 Channel 1 Time varying tracking rail negative power supply
3 Att_Rel1 Attack release rate for channel 1
4 Out1+ Channel 1 speaker positive output
5 Out1- Channel 1 speaker negative output
6 CD+1 Channel 1 positive power supply
7 Pwr_Inp1 Input to channel 1 power stage
8 In_pre1 Pre-amp input for channel 1 (virtual ground)
9 Out_pre1 Output channel 1 pre-amp
10 Trk_1 Absolute value block input for channel 1
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 Trk_2 Absolute value block input for channel 2
19 Out_pre2 Output channel 2 pre-amp
20 In_pre2 Pre-amp input for channel 2 (virtual ground)
21 Pwr_Inp2 Input to channel 2 power stage
22 CD+2 Channel 2 positive power supply
23 Out2- Channel 2 speaker negative output
24 Out2+ Channel 2 speaker positive output
25 Att_Rel2 Attack release rate for channel 2
26 CD-2 Channel 2 Time varying tracking rail negative power supply
27 -Vs Neg ative Bias Supply
4/20
STA575
ELECTRI CAL CH ARAC TER ISTC S
Ω
8
, external components at the nominal value f = 1KHz, Tamb = 25°C unless otherwise specified
(Test Condition: Vs+ = 28V, Vs- = -23V, V
= 20V, V
CD+
= -20V, RL =
CD-
Symbol Parameter Test Condition Min. Typ. Max. Unit
PREAMPLIFIER AND COMPRESSOR
V
out clamp
V
control
VC
Voffset Output Offset at Out_pre pin with: V
THD Distortion at Out_pre: V
Maximum Voltage at Out_pre pin 9 11 13 Vpeak
I
Audio input current 0.8 mA
in
Voltage at Attack_Release pin Attenuation = 0dB
Attenuation = 6dB
Attenuation = 26dB
Input voltage range for the
omp_
Th
compression
Z
Input impedance of Threshold pin 100 KΩ
th
= 0V; Attenuation = 0dB
CRT
V
= 0.5V; Attenuation = 6dB
CRT
V
= 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
V
V
CRT
CRT
CRT
CRT
CRT
CRT
CRT
0.35
6
-5 -1 V
-15
-250
-1000
0
0.5
9
0.01
10
50
60
(2)
0.65
12
15
250
450
0.1
0.5
2
V
V
V
mV
mV
mV
%
%
%
µV
µV
µV
Attack time current at pin
I
ct
Attack_release
1. This value is due to the thermal noise of the external resistors Rr and Ri.
TRACKING PARAM ETER S
G
V
trk_out
I
trk_out
Z
Tracking reference voltage gain 13 14 15 V
trk
Tracking ref. output voltage 0 20 V
Current capability 5 6 7 mA
Input impedance (T
trk_in
)1MΩ
RK1/2
OUTPUT BRIDGE
G
G
∆G
P
Half Output bridge gain 5.5 6 6.5 dB
out
Output bridge differential gain 11 12 13 dB
ch
Output bridges gain mismatch -0 .5 0.5 dB
ch
Continuous Output Power THD = 0.5%
out
THD = 10%
THD = 10%; RL= 4Ω; V
V
= -16V; VS+ = 22V; VS- = -22V
CD-
THD Total harmonic distortion of the
Po = 5W 0.01 0.1 %
output bridge
f = 20Hz to 20KHz; Po = 50W 0.2 %
CD+
= 16V;
0.5 1.5 3 mA
75
9580100
W
W
90 100 W
V
Output bridge D.C. offset -70 70 mV
Off
5/20
STA575
ELECTRICAL CHARACTERISTCS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
EN
Noise at Output bridge pins f = 20Hz to 20KHz; Rg = 50Ω 12 µV
Z
R
OLG
Input impedance 100 140 180 KΩ
br_in
Output power Rdson IO = 1A 200 400 mΩ
dson
Open Loop Voltage Gain 100 dB
GB Unity Gain Bandwidth 1.4 MHz
SR Slew Rate 8V/µs
PROTECTION
V
V
V
Stby voltage range 0 0.8 V
stby
Mute voltage range 1.6 2.5 V
mute
Play voltage range 4 5 V
play
T
First Over temperature threshold 130 °C
h1
Second Over temperature
T
h2
150 °C
threshold
Unbal.
Ground
Upper Unbalancing ground
threshold
Referred to (CD
+
- CD-)/2
5V
Unbal.
Ground
UV
th
P
d_reg.
Lower Unbalancing ground
threshold
Referred to (CD
Under voltage threshold |Vs+| + |Vs-| 18 20 22 V
Power dissipation threshold for
I
= 50µA; @ Vds = 10V 26 32 39 W
prot
+
- CD-)/2
system regulation
P
d_max
Switch off power dissipation
@ Vds = 10V 60 W
threshold
I
Protection current slope for Pd > Pd
prot
I
Limiting Current threshold 6.3 7 7.5 A
lct
reg
I+Vs Positive supply current Stby (Vstby/mute pin = 0V)
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)2020
I-Vs Negative supply current Stby (Vstby/mute pin = 0V)
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)2020
ICD+ Positive traking rail supply current Stby (Vstby/mute pin = 0V)
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)
ICD- Negative traking rail supply current Stby (Vstby/mute pin = 0V)
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)
50
60
60
50
60
60
-5 V
400 µA/W
5
35
35
5
35
35
100
110
110
100
110
110
7
50
50
7
50
50
200
180
180
200
180
180
mA
mA
mA
mA
mA
mA
µA
mA
mA
µA
mA
mA
6/20
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