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ST AN3959 manual available for free PDF download: Application Note
ST AN3959 Application Note (65 pages)
2.0-channel demonstration board based on the STA381BW and STA381BWS
Brand:
ST
| Category:
Motherboard
| Size: 4 MB
Table of Contents
Figure 1. STA381BW/STA381BWS 2.0-Channel Demonstration Board
1
Table of Contents
2
Functional Description of the Demonstration Board
6
Connections
6
Output Configuration
6
Schematic and Block Diagrams, Bill of Material, PCB Layout
7
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
STA381BWS Power Section Test Results
16
Figure 9. Frequency Response, VCC = 18 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
16
Figure 10. Crosstalk, VCC = 18 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
16
Figure 11. SNR, VCC = 18 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
17
Figure 12. THD Vs. Frequency, VCC = 18 V, R L = 8 Ohm, Pout = 1 W
17
Figure 13. FFT (0 Dbfs), VCC = 18 V, R L = 8 Ohm, 0 Dbfs (Pout = 1 W)
18
Figure 14. FFT (-60 Dbfs), VCC = 18 V, R L = 8 Ohm, 0 Dbfs (Pout = 1 W)
18
Figure 16. THD Vs. Output Power at Different Power Supplies, R
19
STA381BW Power Section Test Results
20
Figure 17. Frequency Response, VCC = 24 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
20
Figure 18. Crosstalk, VCC = 24 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
20
Figure 19. SNR, VCC = 24 V, R L = 8 Ohm, 0 Db (Pout = 1 W)
21
Figure 20. THD Vs. Frequency, VCC = 24 V, R L = 8 Ohm, Pout = 1 W
21
Figure 21. FFT (0 Dbfs), VCC = 24 V, R L = 8 Ohm, 0 Dbfs (Pout = 1 W)
22
Figure 22. FFT (-60 Dbfs), VCC = 24 V, R L = 8 Ohm, 0 Dbfs (Pout = 1 W)
22
Figure 15. THD Vs. Output Power
23
Figure 23. THD Vs. Output Power, VCC = 24 V, R L = 8 Ohm, F = 1 Khz
23
Figure 24. THD Vs. Output Power at Different Power Supplies, R
23
Analog Section Test Results
24
Thermal Performance
26
Thermal Results - Test 1
26
Figure 25. Temperature Test 1
26
Thermal Results - Test 2
27
Figure 26. Temperature Test 2
27
Design Guidelines for Schematic and PCB Layout
28
Schematic
28
Criteria for Selection of Components
28
Decoupling Capacitors
28
Output Filter
28
Figure 27. Output Filter (BTL)
28
Snubber Filter
29
Figure 28. Differential-Mode Snubber Circuit
29
Figure 29. Common-Mode Snubber Circuit
29
Main Filter
30
Dumping Network
30
Figure 30. Main Filter
30
Figure 31. Dumping Network
30
Recommended Power-Up and Power-Down Sequence
31
Layout
31
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
Software Setup to Use the STA381BW/STA381BWS Devices (ST Map)
38
Processing Configuration
38
Figure 44. Processing Path
38
Figure 45. 2.1-Channel with Stcompressor TM
38
Stcompressor
39
Figure 46. Stcompressor - Overview
39
Figure 47. Stcompressor - Mapper
39
Figure 48. Stcompressor - Compression Ratio
40
Figure 49. Stcompressor - Limiter Threshold
40
Stcompressor Settings
41
Configuring and Enabling the Stcompressor
41
Figure 50. Stcompressor - Offset Control
41
Example Settings of the Stcompressor
42
Test Results with Apworkbench
44
Figure 51. Apworkbench Results for STC Example
44
CRC Computation
45
Biquad CRC Computation
45
Crossover CRC Computation
45
Stcompressor TM CRC Computation
46
Startup
47
Figure 52. F3X Output
48
Figure 53. F3X for Hpout
48
Short-Circuit Protection for the STA381BW/STA381BWS
49
Settings for Bridge Power-Up
49
Examples of Code (TV Soc)
50
Ffx381X_Sample.h
50
Ffx381X_Sample.C
53
Appendix A Mono BTL Schematic
63
Figure 54. Mono BTL Schematic
63
Revision History
64
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