STA540 STMicroelectronics, STA540 Datasheet - Page 20

• Manufacturer Part Number: STA540
• Description: IC AMP AUD DUAL/QUAD MULTIWATT15
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of STA540

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Max Output Power X Channels @ Load: 38W x 2 @ 4 Ohm; 16W x 4 @ 4 Ohm
• Voltage - Supply: 8 V ~ 22 V
• Features: Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: Multiwatt-15 (Vertical, Bent and Staggered Leads)
• Amplifier Class: AB
• No. Of Channels: 4
• Output Power: 24W
• Supply Voltage Range: 8V To 22V
• Thd + N: 0.02% @ 4W, 4ohm, VS=14.4V
• Load Impedance: 8ohm
• Operating Temperature Range: -40°C To +150°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8880-5

Practical information
6.9
6.10
20/23
PCB ground layout
The device has two distinct ground pins, P-GND (power ground) and S-GND (signal ground)
which are disconnected from each other at chip level. For superior performance the pins
P-GND and S-GND must be connected together on the PCB by low-resistance tracks.
For the PCB-ground configuration, a star-like arrangement, where the center is represented
by the supply-filtering electrolytic capacitor ground, is recommended. In an arrangement
such as this, at least two separate paths must be provided, one for P-GND and one for
S-GND.
The correct ground assignments are as follows:
"
"
Mute function
If the mute function is desired, it can be implemented on pin 6, SVR, as shown in
Figure 29. Optional mute function circuit
Using a different value for R1 than the suggested 3.3 kΩ, results in two different situations:
"
"
V
mute off: V
mute on: V
S
= 10 to 16 V,
on S-GND:
–
–
–
on P-GND:
–
R1 > 3.3 kΩ:
–
–
R1 < 3.3 kΩ:
–
–
standby capacitor (pin 7, or any other standby driving networks),
SVR capacitor (pin 6), to be placed as close as possible to the device,
input signal ground (from active/passive signal processor stages)
power supply filtering capacitors for pins 3 and 13. The negative terminal of the
electrolytic capacitor(s) must be directly tied to the battery negative line and this
should represent the starting point for all the ground paths.
pop noise improvement,
lower mute attenuation;
pop noise degradation,
higher mute attenuation.
SVR
SVR
≥ 0.6 to 0.8 V,
≥ 0.2 V
PLAY
0
MUTE
5V
R2 10K
IN BRIDGE
ST-BY
IN R
IN L
R1 3.3K
10K
0.22µF
0.22µF
0.47µF
470µF
10µF
4
5
12
11
6
8
7
9
13
DIAGNOSTICS
3
10
100nF
15
14
1
2
2200µF
2200µF
D06AU1632
1000µF
BRIDGE
OUT R
OUT L
OUT
V S
Figure
STA540
29.