SGS Thomson Microelectronics STA530 Datasheet
4 X 50W STEREO POWER AMPLIFIER
■
MONOCHIP BRIDG E QUAD CONFIGURABLE
AMPLIFIER OPTIMIZED FOR BASH
ARCHITECTURE
■
4 X 50W OUTPUT POWER @ RL = 8
THD = 10% or (2 x 50W @ 8 Ω + 1 x 100W @
4Ω) or (2 x 100W @ 4 Ω)
■
PRECISION RECTIFIERS TO DRIVE THE
BUCK REGULATOR
■
ON-OFF SEQUENCE/ TIMER WITH MUTE
AND STANDBY
■
PROPORTIONAL OVER POWER OUTPUT
CURRENT TO LIMIT THE BUCK REGULATOR
■
ABSOLUTE POWER BRIDGE OUTPUT
TRANSISTOR POWER PROTECTION
■
ABSOLUTE OUTPUT CURRENT LIMIT
■
INTEGRATED THERMAL PROTECTION
■
POWER SUPPLY OVER VOLTAGE
®
Ω,
STA530
FLEXIWATT27
PROTECTION
■
FLEXIWATT POW ER PAC KAG E WI TH 2 7 PIN
■
BASH® LICENCE REQUIRED
DESCRIPTION
The STA530 is a BASH® power amplifier where
®
BASH
means “High Efficiency”.
BLOCK DIAGRAM
CD+1&2
OUT1+
OUT1-
CD-1&2
PROT
OUT2+
OUT2-
TRK_2/PAR1&2
TRK_1
S
+10
-1
OUTPUT BRIDGE
+10
-1
OUTPUT BRIDGE
ABSOLUTE
VALUE
BLOCK
ABSOLUTE
VALUE
BLOCK
PWR_INP1GND +VS-V
STBY/MUTE
TURN-ON/OFF
SEQUENCE
PROTECTION
SOA
DETECTOR
CONFIG.
PWR_INP3
+10
-1
OUTPUT BRIDGE
+10
-1
OUTPUT BRIDGE
ABSOLUTE
VALUE
BLOCK
ABSOLUTE
VALUE
BLOCK
CD+3&4
OUT3+
OUT3-
CD-3&4
OUT4+
OUT4-
TRK_4/PAR3&4
TRK_3
July 2003
PWR_INP2
PWR_INP4TRK_OUT
D02AU1344
1/17
STA530
DESCRIPTION
(continued)
In fact it's permits to build a BASH® architectur e ampl ifier adding onl y few external components and a va riable
Buck regulator tracking the audio signal. Notice that normally only one Buck regulator is used to supply a multichannel amplifiers sys tem , therefore most of the functions implemented in the cir c uit have a summing output
pin.
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 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 bl ocks are decoupled by a diode to per mit an easy sum of this si gnal
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 condition to guarantee a silent turn-on and turn-off.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
+V
-V
CD+
CD-
Positive supply voltage referred to pin 14 (GND) 27 V
s
Negative supply voltage referred to pin 14 (GND) -27 V
s
Positive supply voltage tracking rail referred to pin 14 (GND) 20 V
Negative supply voltage referred to -Vs
(1)
-0.3 V
V
CD-
V
PWR_Imp1
V
PWR_Imp2
V
TRK_1
V
TRK_2
V
PWR_Imp 3
V
PWR_Imp 4
V
TRK_3
V
TRK_4
I
STBY-max
V
STBY/
MUTE
Notes: 1. V
Negative supply voltage tracking rail referred to pin 14 (GND) -20 V
Pin 11, 10, 9, 8 Negative & Positive maximum voltage referred to
-25 to +25 V
GND (pin 14)
Pin 17, 18, 19, 20 Negative & Positive maximum voltage referred
-25 to +25 V
to GND (pin 14)
Pin 12 maximum input current (Internal voltage clamp at 5V) 500 µA
Pin 12 negative maximum voltage referred to GND (pin 14) -0.5 V
must not be m ore negativ e than -Vs
CD-
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
2/17
STA530
OPERATING RANGE
Symbol Parameter Value Unit
+V
-V
∆V
V
CD+
V
CD-
T
amb
I
sb_max
Positive supply voltage +15 to +25 V
s
Negative supply voltage -15 to -25 V
s
Delta positive supply voltage 5V ≤ (Vs+ - VCD+) ≤ 10V V
s+
Positive supply voltage tracking rail +3 to +15 V
Negative supply voltage tracking rail -15 to -3 V
Ambient Temperature Range 0 to 70 °C
Pin 12 maximum input current (Internal voltage clamp at 5V) 200 µA
PIN CONNECTION
1
-Vs
Out1+
Out1-
CD-1&2
CD+1&2
Out2-
Out2+
NOTE
Slug connected to PINs No. 1 & 27
TRK_1
PWR_Inp2
PWR_Inp1
TRK_2/Par1&2
Gnd
TRK_Out
STBY/MUTE
+Vs
PROT
PWR_Inp3
TRK_3
PWR_Inp4
TRK_4/Par3&4
Out4+
Out4-
CD-3&4
CD+3&4
D02AU1352
Out3-
27
-Vs
Out3+
3/17
STA530
PIN CONNECTION
N° Name Description
1 -Vs Negative Bias Supply
2 Out1+ Channel 1 speaker positive output
3 Out1- Channel 1 speaker negative output
4 CD+1&2 Channels 1 & 2 Time varying tracking rail positive power supply
5 CD-1&2 Channels 1 &2 Time varying tracking rail negative power supply
6 Out2- Channel 2 speaker negative output
7 Out2+ Channel 2 speaker positive output
8 TRK_2/
Par1&2
9 TRK_1 Absolute value block input for channel 1
10 PWR_Inp2 Input to channel 2 power stage
11 PWR_Inp1 Input to channel 1 power stage
12 STBY/MUTE Standby/mute input voltage control
13 TRK_Out Absolute value block output
14 Gnd Analog Ground
15 +Vs Positive Bias Supply
16 PROT Channel Protection signal for STABP01
17 PWR_Inp3 Input to channel 3 power stage
18 PWR_Inp4 Input to channel 4 power stage
19 TRK_3 Absolute value block input for channel 3
20 TRK_4/
Par3&4
21 Out4+ Channel 4 speaker positive output
22 Out4- Channel 4 speaker negative output
Absolute value block input for channel 2,and parallel command for channels 1&2
Absolute value block input for channel 4,and parallel command for channels 3&4
23 CD-3&4 Channels 3 & 4 Time varying tracking rail negative power supply
24 CD+3&4 Channels 3 & 4 Time varying tracking rail positive power supply
25 Out3- Channel 3 speaker negative output
26 Out3+ Channel 3 speaker positive output
27 -Vs Negative Bias Supply
4/17
STA530
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+ = 25V, Vs- = -25V, V
= 15V, V
CD+
= -15V, RL =
CD-
Symbol Parameter Test Condition Min. Typ. Max. Unit
TRACKING PARAM ETER S
G
V
TRK_out
I
TRK_out
Z
TRK_in
V
OFFSET
Tracking reference voltage gain 66 70 74
TRK
Tracking ref. output voltage 0 15 V
Current capability 5 6 mA
Input impedance (T
)1MΩ
RK1/2
Output traking DC offset 100 mV
OUTPUT BRIDGE
G
G
∆G
P
Half Output bridge gain 19 20 21 dB
out
Output bridge differential gain 25 26 27 dB
ch
Output bridges gain mismatch -1 1 dB
ch
Continuous Output Power THD = 1% 39 W
out
THD = 10% 50 W
THD = 10% R
V
= 11V, V
CD+
L
CD-
= 4
Ω
= -11V
40 W
P
2 ch par
THD Total harmonic distortion of the
Continuous Output Power
out
THD = 1% R
THD = 10% R
= 4Ω
L
= 4
L
Ω
78 W
100 W
Po = 5W 0.01 0.1 %
output bridge
f = 20Hz to 20KHz; Po = 20W 0.2 %
V
Z
R
R
dsonMAX
OLG
Output bridge D.C. offset -100 100 mV
Off
EN
Noise at Output bridge pins f = 20Hz to 20KHz; Rg = 50Ω 60 µV
Input impedance 100 140 180 KΩ
br_in
Output power Rdson
dson
= 1A Tj=25o C
I
O
400 500 mΩ
Maximum Output power Rdson IO = 1A 800 mΩ
Open Loop Voltage Gain 100 dB
GB Unity Gain Bandwidth 6 MHz
SR Slew Rate 8V/µs
PROTECTION
V
V
MUTE
STBY
Stby voltage range 0 0.8 V
Mute voltage range 1.6 2.5 V
V
PLAY
T
h1
Play voltage range 4 5 V
First Over temperature threshold 130 °C
5/17
STA530
ELECTRICAL CHARACTERISTCS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
T
Second Over temperature
h2
150 °C
threshold
Unbal.
Ground
Unbal.
Ground
UV
th
P
d_reg.
Upper Unbalancing ground
threshold
Lower Unbalancing ground
threshold
Referred to (CD
Referred to (CD
Under voltage threshold |Vs+| + |Vs-| 18 22 V
Power dissipation threshold for
I
= 50µA; @ Vds = 8V 18 20 23 W
prot
+
- CD-)/2
+
- CD-)/2
5V
-5 V
system regulation
P
d_max
Switch off power dissipation
@ Vds = 8V 30 W
threshold
I
prot Pd
I
prot Id
I
I
I+Vs Positive supply current Stby (Vstby/mute pin = 0V)
Protection current slope for Pd > Pd
Protection current slope for Id > Id
Limiting Current threshold “soft” 4 4.5 5 A
lct s
Limiting Current threshold “hard” 4.5 5 5.5 A
lct h
reg
reg
400 µA/W
400 µA/A
5
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)
TBD
TBD
mA
mA
mA
I-Vs Negative supply current Stby (Vstby/mute pin = 0V)
Mute (Vstby/mute pin = 2.5V)
Play (Vstby/mute pin = 5V no signal)
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)
6
29
33
200
85
85
200
85
85
mA
mA
mA
µA
mA
mA
µA
mA
mA
6/17
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