FLEXIWATT27 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

FLEXIWATT27

4 X 50W STEREO BASH POWER AMPLIFIER

STMicroelectronics 

STA530

Rth = T----j--m----a---x-P---–--d--T----a---m----b-- – Rth –j case – Rth case to heatsink

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

Main DC

Input

VS DC

Input

Mute

4 Pins Harness

Power Supply Connections

4 Supply Connections

Audio

Inputs

Preamplifier PCB

9 Pins Harness

Audio Connections

Amplifier PCB

SAM261 Specification

Parameter

Output Power

THD + N

SNR

Sensitivity

Crosstalk

Main Power Supply Inputs

Aux Power Supply Inputs

Rating

Sats @ 8Ω - 55 Watts @ 10%

Sub @ 4Ω - 100 Watts @ 10%

< 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

Notes

See Graphs

Measured @ 1KHZ

Channel 5 terminated

Amplifier

Channel 5 @ 10W 1KHz 8Ω,

Channel 3 input terminated

Maximum Voltage is 50Vdc

Minimum Voltage is 40Vdc

13/17

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