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AN3959 Datasheet(PDF) 4 Page - STMicroelectronics

Part # AN3959
Description  The purpose of this application note is to describe
PDF  65 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 Datasheet(HTML) 4 Page - STMicroelectronics

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List of figures
AN3959
4/65
Doc ID 022081 Rev 3
List of figures
Figure 1.
STA381BW/STA381BWS 2.0-channel demonstration board . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Schematic-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
Schematic-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
Top view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5.
Inner layer2 view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6.
Inner layer3 view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7.
Bottom view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8.
Block diagram of test connections with equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9.
Frequency response, VCC = 18 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . 16
Figure 10.
Crosstalk, VCC = 18 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11.
SNR, VCC = 18 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 12.
THD vs. frequency, VCC = 18 V, RL = 8 ohm, Pout = 1 W . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13.
FFT (0 dBFS), VCC = 18 V, RL = 8 ohm, 0 dBFS (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . 18
Figure 14.
FFT (-60 dBFS), VCC = 18 V, RL = 8 ohm, 0 dBFS (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . 18
Figure 15.
THD vs. output power, VCC = 18 V, RL = 8 ohm, f = 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 16.
THD vs. output power at different power supplies, RL = 8 ohm, f = 1 kHz . . . . . . . . . . . . . 19
Figure 17.
Frequency response, VCC = 24 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . 20
Figure 18.
Crosstalk, VCC = 24 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 19.
SNR, VCC = 24 V, RL = 8 ohm, 0 dB (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 20.
THD vs. frequency, VCC = 24 V, RL = 8 ohm, Pout = 1 W . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 21.
FFT (0 dBFS), VCC = 24 V, RL = 8 ohm, 0 dBFS (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . . 22
Figure 22.
FFT (-60 dBFS), VCC = 24 V, RL = 8 ohm, 0 dBFS (Pout = 1 W) . . . . . . . . . . . . . . . . . . . . 22
Figure 23.
THD vs. output power, VCC = 24 V, RL = 8 ohm, f = 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 24.
THD vs. output power at different power supplies, RL = 8 ohm, f = 1 kHz . . . . . . . . . . . . . 23
Figure 25.
Temperature test 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 26.
Temperature test 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 27.
Output filter (BTL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 28.
Differential-mode snubber circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 29.
Common-mode snubber circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 30.
Main filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 31.
Dumping network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 32.
Recommended power-up and power-down sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 33.
Snubber network soldered as close as possible to the respective IC pin . . . . . . . . . . . . . . 31
Figure 34.
Electrolytic capacitor used first to separate the VCC branches . . . . . . . . . . . . . . . . . . . . . . 32
Figure 35.
Path between VCC and ground pin minimized in order to avoid inductive paths . . . . . . . . 32
Figure 36.
Large ground plane on the top side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 37.
Large ground plane on inner layer2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 38.
Large ground plane on inner layer3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 39.
Large ground plane on bottom side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 40.
Symmetrical paths created for output stage, for differential applications . . . . . . . . . . . . . . 35
Figure 41.
Coils separated in order to avoid crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 42.
VCC filter for high frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 43.
Thermal layout with large ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 44.
Processing path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 45.
2.1-channel with STCompressorTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 46.
STCompressor - overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 47.
STCompressor - mapper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 48.
STCompressor - compression ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40



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