I bring to your attention the development of a prototype of a 600 W audio amplifier
The amplifier uses a TPA3255 chip manufactured by Texas Instruments. This is a high efficiency, high quality four channel Class D amplifier.
The principle of operation is quite simple. An analog signal is fed to the input of the microcircuit, it is converted into PWM and fed to the output power stages.
, PBTL . .
, .
PBTL , :
SE – 148 ;
PBL – 315 .
, 600 .
:
PVDD 53.5 ;
GVDD 12 ;
VDD 12 .
, VBG, AVDD 7.75 , DVDD 3.3 . , 1 .
PVDD, GVDD, VDD (UVP - Under Voltage Protection) FAULT 0, .
PBTL M1 M2 , INPUTC INPUTD. INPUTA INPUTB 2 V RMS. OUTA OUTC , OUTB OUTD .
C_START, PBTL 47 .
PWM FREQ_ADJ
FREQ_ADJ |
PWM |
30 |
450 |
20 |
500 |
10 |
600 |
, . PWM .
OC_ADJ .
.
CB3C (Cycle By Cycle Current Control) Latching Over Current.
CB3C PWM CLIP_OTW, , , PWM, – . (, ) , FAULT , RESET.
Latching Over Current , FAULT , RESET.
OC_ADJ
OC_ADJ |
|
|
22 |
CB3C |
17.0 A |
24 |
CB3C |
15.7 A |
27 |
CB3C |
14.2 A |
30 |
CB3C |
12.9 A |
47 |
Latched OC |
17.0 A |
51 |
Latched OC |
15.7 A |
56 |
Latched OC |
14.2 A |
64 |
Latched OC |
12.9 A |
CB3C 17 . 22 .
:
Overtemperature Warning – OTW , 120°C CLIP_OTW. .
Overtemperature Error – OTE, 155°C, , FAULT . RESET.
RESET , , . . 3.3 . RESET .
FAULT CLIP_OTW . ’ ’ 3.3 . . , CLIPOTW , FAULT .
BSTA BSTB BSTC BSTD .
OSCIOM OSCIOP PWM . 600 .
53,5 . , 600 . 15% – 30% . , , . , 600 , , 10 , .
53.5 10000 . , . : . , . , .
, Q3 Q4.
12 , LM2596HVS-ADJ ( LM2596HV-12), , , HV.
3.3 LM1117-3.3 .
TH1 10 , U1 Q6. 10 0603 , , 45°C – 50°C , , , 40°C 50°C R45 4,7 , R30 . / .
, . , PWM . , , . PWM , , .
. , , , . Texas Instruments . 90%, , 60 .
Intel LGA1150/LGA1155/LGA1156. .
(), .
XLR.
, . U3, U4, U5.
U3 . . VD2, R27, C33 R26. U3B , .
U4 . . U4B .
U5 TPA3255.
. FR-4 (2 oz – ).
It is quite difficult for me to assess how interesting the topic of electronics development is to the readers of Habr and how detailed it makes sense to describe the device, design or principle of operation. In addition, since during the development of this project there was no real terms of reference, some aspects may seem excessive, and some insufficiently worked out. If you have a desire to implement or build this amplifier into your device, I am ready to make changes to your real needs.
Also, if you have suggestions to develop some kind of board or circuit for public access, or joint development, I'm ready to consider.
The schematic and board design in KiCAD can be found here.