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PDF STA550 Data sheet ( Hoja de datos )
| Número de pieza | STA550 | |
| Descripción | 70 + 70W STEREO BASH POWER AMPLIFIER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STA550
70+70W STEREO
POWER AMPLIFIER
s MONOCHIP BRIDGE STEREO AMPLIFIER
FOR BASH® ARCHITECTURE
s 55+55W OUTPUT POWER @ RL = 4/8 Ω,
THD = 0.5%
s 70+70W OUTPUT POWER @ RL = 4/8 Ω,
THD = 10%
s HIGH DYNAMIC PREAMPLIFIER INPUT
STAGES
s EXTERNAL PROGRAMMABLE FEEDBACK
TYPE COMPRESSORS
s AC COUPLED INPUT TO CLASS AB BRIDGE
OUTPUT AMPLIFIER
s PRECISION RECTIFIERS TO DRIVE THE
DIGITAL CONVERTER
s ON-OFF SEQUENCE/ TIMER WITH MUTE
AND STANDBY
s PROPORTIONAL OVER POWER OUTPUT
CURRENT TO LIMIT THE DIGITAL
CONVERTER
s ABSOLUTE POWER BRIDGE OUTPUT
FLEXIWATT27
TRANSISTOR POWER PROTECTION
s ABSOLUTE OUTPUT CURRENT LIMIT
s INTEGRATED THERMAL PROTECTION
s POWER SUPPLY OVER VOLTAGE
PROTECTION
s FLEXIWATT POWER PACKAGE WITH 27 PIN
s BASH® LICENCE REQUIRED
DESCRIPTION
The STA550 is a fully integrated power module de-
signed to implement a BASH® amplifier when used
in conjunction with STABP01 digital processor.
BLOCK DIAGRAM
+VS GND -VS
OUT_ PRE1 TRK_1 PWR_INP1
IN_PRE1
ATT_REL1
TRK_OUT
THRESH
ATT_REL2
IN_PRE2
+
-
∆G
COMPRESSOR
V/l
S1
PEAK/2
DETECTOR
Ict
Ict
S1
PEAK/2
DETECTOR
V/l
COMPRESSOR
∆G
-
+
ABSOLUTE
VALUE
BLOCK
+2
-1
OUTPUT BRIDGE
VOLTAGE
PROTECTION
SOA
DETECTOR
THERMAL
PROTECTION
TURN-
ON/OFF
SEQUENCE
ABSOLUTE
VALUE
BLOCK
+2
-1
OUTPUT BRIDGE
CD+1
OUT1+
OUT1-
CD-1
CD+
PROT.
STBY/MUTE
CD+2
OUT2+
OUT2-
CD-2
July 2003
OUT_ PRE2 TRK_2 PWR_INP2
D01AU1263
1/16
1 page  
PIN FUNCTION
N° Name
1 -Vs
2 CD-1
3 Att_Rel1
4 Out1+
5 Out1-
6 CD+1
7 Pwr_Inp1
8 In_pre1
9 Out_pre1
10 Trk_1
11 Stby/mute
12 Protection
13 Gnd
14 +Vs
15 CD+
16 Trk_out
17 Threshold
18 Trk_2
19 Out_pre2
20 In_pre2
21 Pwr_Inp2
22 CD+2
23 Out2-
24 Out2+
25 Att_Rel2
26 CD-2
27 -Vs
Description
Negative Bias Supply
Channel 1 Time varying tracking rail negative power supply
Attack release rate for channel 1
Channel 1 speaker positive output
Channel 1 speaker negative output
Channel 1 positive power supply
Input to channel 1 power stage
Pre-amp input for channel 1 (virtual ground)
Output channel 1 pre-amp
Absolute value block input for channel 1
Standby/mute input voltage control
Protection signal for STABP01 digital processor
Analog Ground
Positive Bias Supply
Time varying tracking rail positive power supply
Reference output for STABP01 digital processor
Compressor threshold input
Absolute value block input for channel 2
Output channel 2 pre-amp
Pre-amp input for channel 2 (virtual ground)
Input to channel 2 power stage
Channel 2 positive power supply
Channel 2 speaker negative output
Channel 2 speaker positive output
Attack release rate for channel 2
Channel 2 Time varying tracking rail negative power supply
Negative Bias Supply
STA550
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5 Page 
STA550
Figure 4. Power Protection Block Diagram
CD+1
RSENSE
CD+
ILOAD
V/I
ILIM
OC1
CURRENT COMP
TO TURN-ON/OFF
SEQUENCE
OPA
MULTIPLIER X
V/I
I_PD
OPA
IPD
IPDP
IPD
IPDA
PDP1
CURRENT COMP
TO TURN-ON/OFF
SEQUENCE
IPROT
TO PROT PAD
OUT1+ CD- OUT1-
D01AU1266
In fig. 4 there is the power protection strategy pictures. Under the curve of the 25W power, the chip is in normal
operation, over 48W the chip is forced in Standby. This last status would be reached if the digital converter does
not respond quikly enough reducing the stress to less than 48W.
The fig.5 gives the protection current, Iprot, behavior. The current sourced by the pin Prot follows the formula:
Iprot ≡ -(--P----d----–-----P----d---_---1a---v.--2-_--5-t-h--V--)----⋅---5-----⋅---1---0----–--4-
for Pd < Pd_av_th the Iprot = 0
Independently of the output voltage, the chip is also shut down in the folowing conditions:
When the currentthrough the sensing resistor, Rsense, reaches 6A (Voltage drop (CD+) - (CD+1) = 700mV).
When the average junction temperature of the chip reaches 150°C.
When the ground potential differ from more than 5V from the half of the power supply voltage, ((CD+)-(CD-))/2
When the sum of the supply voltage |Vs+| + |Vs-| <20V
The output bridge is muted when the average junction temperature reaches 130°C.
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet STA550.PDF ] | |
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