sta530 STMicroelectronics, sta530 Datasheet - Page 13

• Manufacturer Part Number: sta530
• Description: 4 X 50w Stereo Bash Power Amplifier
• Manufacturer: STMicroelectronics

For example in the STA530 the Rth jc is 1°C/W. R case-to-heatsink with grease is about 0.5 °C/W. The maxi-
mum operating junction temperature is 130 °C, which for margin should be derated to 120 °C.
Buck Regulator Heatsink
The Buck regulator heatsink can be designed in a similar manner and does not change by varying power supply.
In general the efficiency will be in the order of 85%. The thermal impedances from the junction(s) to the heatsink
may be lower and the maximum operating temperature will be higher. Usually either the sub or the remaining
channels are tested at full power. The result is that usually the Buck heatsink is about ¼ the size of the linear
heatsink, but this can be strongly affected by the design.
Figure 8. PCBs AND COMPONENTS LAYOUT
SAM261 Specification
Output Power
THD + N
SNR
Sensitivity
Crosstalk
Main Power Supply Inputs
Aux Power Supply Inputs
VS DC
Input
Main DC
Input
Audio
Inputs
Mute
Parameter
Preamplifier PCB
R
th
=
T
---------------------------------- R
Sats @ 8
Sub @ 4
< 0.05% @ 40 Watts
< 0.05% @ 75 Watts
-102 dB (relative to full power)
-110 dB (A-weighted)
1 VRMS
-87dB (relative to10W)
50Volts @ 2 Amps
+ 24 Volts @ 100mA
-24 Volts @ 100mA
jmax
P
–
d
T
4 Supply Connections
amb
Power Supply Connections
Audio Connections
-
- 100 Watts @ 10%
–
4 Pins Harness
9 Pins Harness
Rating
th j c ase
55 Watts @ 10%
–
–
R
th cas e to heatsink
See Graphs
Measured @ 1KHZ
Channel 5 terminated
Amplifier
Channel 5 @ 10W 1KHz 8 ,
Channel 3 input terminated
Maximum Voltage is 50Vdc
Minimum Voltage is 40Vdc
Amplifier PCB
Notes
STA530
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